Literature

 

Literature pertinent to the L-07D includes the instruction manuals, the service manuals, the sales brochure, the DS-20 Outer Disc Stabilizer Guide Book and the TS-10 Turntable Sheet Guide Book.  All of the above referenced literature booklets are available on this page for viewing and printing.  I have set the page size, such that each page should print out on a single sheet of paper on a standard printer.

I have also created some documents which I have developed from the L-07D & L-07D II schematics and service manuals.  These documents help me troubleshoot and repair these decks.  On this page, the above referenced documents are available for display below. 


L-07D Instruction Manual in English

The pages below are from the North American L-07D instruction manual:

Front Cover

Page 2

Page 3

Page 4

Page 5

Page 6

Page 7

Page 8

Page 9

Page10

Page 11

Page 12

Page 13

Page 14

Page 15

Back Cover

Trio Front Cover

Trio Back Cover

L-07D Instruction Manual in English in PDF format


L-07D Instruction Manual in French - German - Dutch - Swedish

The pages below are from the French/German/Netherlands/Swedish L-07D instruction manual:

Front Cover

Page 2

Page 3

Page 4

Page 5

Page 6

Page 7

Page 8

Page 9

Page 10

Page 11

Page 12

Page 13

Page 14

Page 15

Page 16

Page 17

Page 18

Page 19

Page 20

Page 21

Page 22

Page 23

Page 24

Page 25

Page 26

Page 27

Page 28

Page 29

Page 30

Page 31

Rear Cover

L-07D Instruction Manual in French - German - Dutch - Swedish in PDF format


L-07D II Instruction Manual in English - French - Spanish

The pages below are from the English/French/Spanish L-07D II instruction manual:

Front Cover

Page 2

Page 3

Page 4

Page 5

Page 6

Page 7

Page 8

Page 9

Page 10

Page 11

Page 12

Page 13

Page 14

Page 15

Page 16

Page 17

Page 18

Page 19

Page 20

Page 21

Page 22

Page 23

Page 24

Page 25

Page 26

Page 27

Page 28

Page 29

Page 30

Page 31

Page 32

Page 33

Page 34

Page 35

Page 36

Page 37

Page 38

Page 39

Back Cover

L-07D II Instruction Manual in English - French - Spanish in PDF format


L-07D Service Manual in English

Front Cover

Page 2

Page 3

Page 4

Page 5

Page 6

Page 7

Page 8

Page 9

Page 10

Page 11

Page 12

Page 13

Page 14

Page 20

Page 21

Page 22

Page 23

Page 24

L-07D Service Manual in English in PDF format


L-07D II Service Manual in English

Front Cover

Page 2

Page 3

Page 4

Page 5

Page 6

Page 7

Page 8

Page 9

Page 9 (German)

Page 10 (French)

Page 11

Page 12

Page 13

Page 14

Page 15

Page 16

Page 17

Page 18

Page 19

L-07D II Service Manual in English in PDF format


L-07D Brochure

Front Cover

Page 1

Page 2

Page 3

Page 4

Page 5

Back Cover


DS-20 Outer Disc Stabilizer Guide Book

Front Cover

Page 2

Page 3

Page 4

Page 5

Page 6

Page 7

Page 8

Page 9

Page 10

Page 11

Back Cover

Compensating Felt Application Instructions


DS-20 Outer Ring Stabiliser Reproduction Information Sheet

Information Sheet from Vantage Audio


TS-10 Turntable Sheet Guide Book

Front Cover

Page 2

Page 3

Page 4

Page 5

Back Cover


TS-10 Turntable Sheet and DS-20/21 Disc Stabilizer Brochure

Page 1

Page 2

Page 3

Page 4


English Language Audio Magazine Advertisements

October 1980 "Audio"

March 1981 "Practical Hi-Fi", advertisement by Subjective Audio

March 1981 "Practical Hi-Fi", advertisement by Bespoke Audio


English Language Review Articles

March 1981 "Practical Hi-Fi", Front Cover

March 1981 "Practical Hi-Fi", article by Dave Berriman, Page 86

March 1981 "Practical Hi-Fi", article by Dave Berriman, Page 87

July 1981 "Practical Hi-Fi", Front Cover

July 1981 "Practical Hi-Fi" article by Dave Berriman, Page 52, comparing the Oracle turntable to the L-07D

July 1981 "Practical Hi-Fi" article by Dave Berriman, Page 53, comparing the Oracle turntable to the L-07D

July 1981 "Practical Hi-Fi" article by Dave Berriman, Page 54, comparing the Oracle turntable to the L-07D

Hi-Fi Choice 1981 Booklet: "Turntables and Tonearms", Front Cover

Hi-Fi Choice 1981 Booklet: "Turntables and Tonearms", article by Martin Colloms, Page 188

Hi-Fi Choice 1981 Booklet: "Turntables and Tonearms", article by Martin Colloms, Page 189

Hi-Fi Choice 1981 Booklet: "Turntables and Tonearms", article by Martin Colloms, Page 190

March 1998 "Hi-Fi World", article by Jon Marks

An English translation by the author of an article that appears in the November 2006 Issue 58 of the German audio magazine Hörerlebnis


German Language Kenwood Brochures

Brochure entitled "HIFI Extra Dry", L-07D Page 1

Brochure entitled "HIFI Extra Dry", L-07D Page 2

Brochure entitled "Kenwood Hi-Fi Stereo", L-07D Page 1

Brochure entitled "Kenwood Hi-Fi Stereo", L-07D Page 2


German Language Audio Magazine Advertisements

March 1981 "Practical Hi-Fi", advertisement by Kenwood


German Language Review Articles

August 1980 "HIFI exclusiv", Front Cover

August 1980 "HIFI exclusiv", article by Alejandro Wagner, Page 7

August 1980 "HIFI exclusiv", article by Alejandro Wagner, Page 8

August 1980 "HIFI exclusiv", article by Alejandro Wagner, Page 9

August 1980 "HIFI exclusiv", article by Alejandro Wagner, Page 10

August 1980 "HIFI exclusiv", article by Alejandro Wagner, Page 11

August 1980 "HIFI exclusiv", article by Alejandro Wagner, Page 12

March 1981 "Practical Hi-Fi", article by Dave Berriman, Page1

March 1981 "Practical Hi-Fi", article by Dave Berriman, Page 2

March 1981 "Practical Hi-Fi", article by Dave Berriman, Page 3


Italian Language Review Articles

Stereoplay 1981 article by F. Gatta and Roberto Battaglia

English Language translation of Stereoplay 1981 article by Roberto Salafia: r.salafia@tin.it


Cartridge Alignment

L-07D Cartridge Alignment Measurements

Critical measurements for the L-07D tonearm are:

Spindle-to-Pivot distance:                229.5mm

Tonearm Effective Length (Leff):      245.0mm

Spindle Diameter:                            0.2825 inches

Calculated Overhang (Baerwald):    16.8mm

Calculated Overhang (Löfgren):       17.2mm

My opinion is that Baerwald alignment (of 16.8mm overhang) sounds better than Löfgren alignment.  Baerwald alignment geometrically allows better tracking on the inner grooves.  The non-damped ultra-rigid design of the L-07D tonearm mechanism works better at the inner grooves when Baerwald alignment is used.

A Microsoft Excel spreadsheet showing calculation of Baerwald  and Löfgren cartridge alignment calculations is posted at:

Kenwood L-07D Baerwald-
Löfgren Cartridge Alignment Spreadsheet    You can use the tabs at the bottom left of the spreadsheet to toggle between Baerwald and Löfgren spreadsheets.

Author's Recommended Method of Phonographic Cartridge Alignment on the L-07D

To level the platter, use an accurate circular bubble level on the subplatter.  The platter sheet has a slight crown and should not be used for leveling.  The bubble level in the plinth is not usually perfectly parallel to the platter.

For geometry to be correct, overhang and zenith must be perfect at proper VTA.  I have used a several alignment tools including a metal Denessen Soundtractor and a Turntable Basics Phono Cartridge Alignment Tool.  I have also measured actual overhang beyond the spindle along the overhang line.

Now I only use a custom made for the L-07D Wally Tractor.  The Wally Tractor is far superior to any other method and/or device that I have tried in terms of accuracy as it is custom made exactly to the L-07D's tonearm geometry.  I have reached the opinion that setting cartridge alignment with any universal cartridge alignment tool will result in imperfect cartridge alignment.  For instructions on phono cartridge alignment, the reader is referred to Wally's Complete Turntable Setup Procedure which can be found on Wally Malewicz' web site: Wally's Vinyl Corner.  If you order a Wally Tractor, be sure to let Wally know that the spindle diameter is 0.2825 inches.

I use Wally's recommendation to set SRA at 92 degrees.  First set VTA so that the headshell is parallel to the record surface at correct VTF and at correct overhang and zenith per alignment protractor.  Theoretically SRA should now be at 90 degrees.  Now raise the tonearm at the base by 8.59mm to increase SRA 2 degreess to 92 degrees.  (1mm increase in SRA = 4.29mm increase in rear arm pivot height).  Next, reset overhang and zenith with alignment protractor and reset VTF.  I then set azimuth with a non magnetic level on the headshell with the stylus raised off of the LP.  You can loosen the headshell collar and then slight play of the headshell allows azimuth adjustment.  The slight play is gone after finger tightening the headshell collar.

For setting VTF, forget about balance beam scales.  They are not very inaccurate.  Use a good digital stylus pressure gauge.  Measurement should be taken at record surface level.  All alignment parameters will affect VTF, so readjust VTF after completing platter leveling and phono cartridge alignment.

When zenith is properly set, the cartridge will be rotated slightly clockwise from the long axis of the headshell (when the headshell and cartridge are viewed from above).  Achieving the necessary degree of cartridge rotation to set zenith correctly is generally not a problem with the L-07D headshell if the cartridge uses full length screws and nuts for attachment.  However if the cartridge has fixed threaded screw holes, the captured design of the L-07D headshell finger might not allow sufficient cartridge rotation to set zenith correctly.  Therefore, with cartridges that have fixed threaded screw holes and if correct zenith can not be achieved with the original headshell, I recommend the Sumiko HS-12 headshell, which is highly adjustable.  I also recommend the Sumiko HS-12 headshell as an excellent alternative to the original L-07D headshell.  If you have a Sumiko Flux Buster cartridge demagnitizer, it is very handy to use to position the headshell for final tightening of cartridge attachment hardware, off the tonearm and away from the turntable.

If you are using a DS-20 Outer Disk Stabilizer, pay careful attention to the tonearm cueing mechanism.  It is important to prevent the stylus tip from contacting the Outer Disk Stabilizer, particularly when the platter is spinning, to prevent damage to the stylus and/or cartridge cantilever.  With VTA optimally adjusted, be sure that the when the tonearm cueing mechanism is raised that the stylus tip is at least a couple of millimeters above the outer portion of the DS-20 (when DS-20 is on a record).  If there is not enough clearance (and if there is room to raise the tonearm cueing mechanism cylinder further), adjust the tonearm cueing mechanism height by loosening the Allen grub screw(s) securing the cueing mechanism cylinder to tonearm collar with a 1.5mm metric Allen key.  Prior to performing this procedure, the headshell should be removed and the tonearm should be removed from the tonearm base and taken over to a clean work area for this procedure.  Do not put any force on the lifter support as you change the cylinder position or you may damage the cueing mechanism internally.  Raising the cueing mechanism cylinder in relation to the tonearm collar will provide additional clearance between the stylus and the DS-20 Outer Disk Stabilizer.  Re-tighten the Allen grub screw(s) after completing the adjustment.  Please note that this procedure can only be done if there was some clearance between the screw securing the lifter support to the cueing piston and the rubber button above it when the tonearm is parked.  Do not attempt this procedure if no clearance exists between the screw securing the lifter support to the cueing piston and the rubber button above it when the tonearm is parked.

 
The difference that perfect cartridge alignment has on playback sound quality in terms of stylus tracking, channel separation and soundstaging is not small!
 

Repair Related Information

I have created some documents which I have developed from the L-07D & L-07D II schematics and service manuals.  These documents help me troubleshoot and repair these decks.  All values and connections have been verified by me during service and repairs.  [Information in brackets is/are replacement part supplier(s) and/or part number(s), see Links page for vendor contact info.]  I have reproduced these documents below:

Kenwood L-07D Logic PCB (X29-1180-00) Components and Values

R101        1M

R102        1M

R103        150K

R104        10K

R105        10K

R106        1M

R107        100K

R108        100K

R109        100K

R110        100K

R111        1M

R112        13K

R113        13K

R114        12K

R115        12K

R116        33K (2% Tol)

R117        5.6K

R118        5.6K

R119        330K (2% Tol)

R120        820

R121        820

R122        47K

R123        100K

R125        0.47 1W (On board = 0.82 5W)

R127        47K

R128        100K

R129        0.47 1W (On board = 0.82 5W)

R130        2.2K

R131        2.2K

R132        33K

R133        33K

R134        33K

R135        33K

R136        1.5K

R137        1.5K

R138        5.6K

R139        5.6K

R140        3.3K

R141        3.3K

R142        22K

R143        47K

R144        100K

R145        100K

R146        100K

R148        15K  (1% Tol)

R149        11K

R150        22K

R151        27K

R152        39K

R153        47K

R154        39K

R155        56K

R156        27K

R159        1K

R160        1K

R161        220K

R162        220K

R163        2.2K

R164        33 Fused

R165        33 Fused

R168        1M

R182        1M

R183        120K

R184        22K

R185        1M

R186        820

R187        82

R188        82

R189        330K (Incorrectly listed as 680K on page 6 of L-07D II service manual)

R190        330K (Incorrectly listed as 680K on page 6 of L-07D II service manual)

R191        1M

R192        47K (Late model L-07D and all L-07D II only on underside of PCB in circuit from IC10 Pin1 to C115)

R193        47K (Late model L-07D and all L-07D II only on underside of PCB in circuit from IC11 Pin1 to C117)

 

RA1         10K SIP Resistor Network  12 Leads for 6 Resistors

RA2         10K SIP Resistor Network  12 Leads for 6 Resistors

RA3         10K SIP Resistor Network  12 Leads for 6 Resistors

RA4         100K SIP Resistor Network  10 Leads for 5 Resistors

RA5         100K SIP Resistor Network  10 Leads for 5 Resistors

 

VR1         22K Trimmer Pot     33 rpm

VR2         22K Trimmer Pot     45 rpm

VR3         220K Trimmer Pot   SC1-GAIN

VR4         100K Trimmer Pot   BI-2

VR5         100K Trimmer Pot   BI-1

VR6         100K Trimmer Pot   BO-1

VR7         100K Trimmer Pot   BO-2

 

C101       22pf Ceramic    [Allied 507-0201], [Radio Shack 272-809]

C102       22pf Ceramic

C103       22pf Ceramic

C104       22pf Ceramic

C105       0.0033uf Mylar    [Allied 998-0050]

C106       0.033uf Mylar (Larger than C124 and C125, probably higher voltage)     [Allied 862-2206]

C107       4.7uf Tantalum (Tantalum capacitors are polarized with + and – leads)    [Allied 852-5651]

C108       4.7uf Tantalum (Tantalum capacitors are polarized with + and – leads)

C109       0.1uf Mylar    [Allied 613-0557]

C110       0.01uf Mylar    [Allied 862-2200]

C111       22uf 16V Electrolytic    [Allied 852-6640]

C114       0.039uf Mylar    [Allied 862-2207]

C115       10uf 16V Non-Polar Electrolytic    [NTE NPR10M50]

C116       0.039uf Mylar

C117       10uf 16V Non-Polar Electrolytic

C118       0.001uf Mylar    [Allied 998-0044]

C119       0.001uf Mylar

C120       0.001uf Mylar

C121       0.001uf Mylar

C122       0.001uf Mylar

C123       0.001uf Mylar

C124       0.033uf Mylar    [Allied 862-2206]

C125       0.033uf Mylar

C126       0.1uf 25V Ceramic    [Allied 926-3418] [Vishay Cera-Mite HY850]

C127       2.2uf 50V Long Life Electrolytic    [Allied 852-7094]

C128       2.2uf 50V Long Life Electrolytic

 

IC1         CD4001BCN

IC2         BC40106BCN

IC3         CD4022BCN

IC4         CD4027BCN

IC5          RC4558P

IC6          MSM5819RS    [East Coast Part Number V30-0424-10]

IC7          UPD4066BC

IC8          UPD4066BC

IC9          RC4558P

IC10        RC4558P

IC11        RC4558P

 

X-tal        L77-1101-05            labeled 5.5296 1101-0 TKC-H            Schematic Lists X-Tal as 5.5296 MHz

 

Alignment points:  GND, TRP, TPF, SC 1, SC 2

Two dual TO-3 Heat Sinks

Q1           2SC945    [NTE 85]

Q2           2SC945

Q3           2SC945

Q5           2SA733    [NTE 290A]

Q6           2SA733

Q7           2SA733

Q8           2SC945

Q9           2SC945

Q12         2SC945

Q13         2SA733

Q14         2SC945

Q15         NECD586   aka 2SD586 (60 Watt Power Transistor 5A/100V/15Mhz Silicon NPN) TO-3    [Obsolete]

Q16         2SA733

Q17         2SC945

Q18         NECB616   aka 2SB616  (60 Watt Power Transistor 5A/100V/15Mhz Silicon PNP) TO-3    [Obsolete]

Q19         NECD586   aka 2SD586

Q20         2SC945

Q21         NECB616   aka 2SB616

Q22         2SA733         

Q23         2SA733

Q24         2SC945

Q25         2SC945

Q26         2SA921    Note, some boards substitute 2SA733, if so I replace with [NTE 91]

Q27         2SC945

Q28         2SC945

 

PH 1        10 pin connecting post.    Uses wire wrap posts spaced 0.10 inches apart (Standard IC connector spacing) On L-07D II round leads in white connector spaced 0.10 inch apart.

PH 2        6 pin connecting post.      Uses wire wrap posts spaced 0.10 inches apart (Standard IC connector spacing)

PH 3        11 pin connecting post.    Uses wire wrap posts spaced 0.10 inches apart (Standard IC connector spacing) On L-07D II round leads in white connector spaced 0.10 inch apart.

PH 4        2 pin connecting post.      Uses wire wrap posts spaced 0.10 inches apart (Standard IC connector spacing)

 

D1           1N60               1N60 replacement is ECG 109, a Germanium general purpose

D2           1N60               diode, max. forward voltage drop is 1 volt at 200ma. 

D3           1N60               [NTE 110A] (Germanium)

D4           1N60

D5           WZ-069          [NTE-5071A] (Zener)

D6           WZ-069

D7           1N60

D8           1N60

 

To convert a Generation I board to an L-07D II board:

1.  Interrupt original top trace between (Right/IC8 side of) C115 and Pin 1 of IC 10

2.  Solder in 47K resistor on underside of board from (IC8 side of) C115 to Pin 1 of IC 10

3.  Interrupt trace on underside between solder point under R120 to solder point under the number “6” of Q6

4.  Solder in 47K resistor between solder point under R120 and solder point under the number “6” of Q6

5.  Solder in Jumper on underside of board from Pin 10 of IC 8 to (Left/IC8 side of) C117

 

Low profile IC Sockets:

8 Pin      [Mouser 575-113308], [Radio Shack 276-1995]

14 Pin    [Mouser 575-113314], [Radio Shack 276-1999]   

16 Pin    [Mouser 575-113316], [Radio Shack 276-1998]

18 Pin    [Mouser 575-113318], [Radio Shack 276-1992]


Kenwood L-07D Power Supply PCB (X27-1390-02) Components and Values

R401        8.2K

R402        15K

R403        1.2  1W

R404        8.2K

R405        15K (2% Tol)

R406        1.2  1W

R407        12K

R408        22.6K (1% Tol)

R409        10K

R410        12.1K (1% Tol)

R412        220 2W

R413        3.09K (1% Tol)

R416        6.81K (1% Tol) (Incorrectly listed as 6.18K on page 4 of L-07D II service manual)

 

C401      10,000uF 35V 85degree ELNA CE69W(P) 40mm Diameter x 30mm Height, 4-Pin PCB Mount

C402      10,000uF 35V 85degree ELNA CE69W(P) 40mm Diameter x 30mm Height, 4-Pin PCB Mount

[BHC ALC10C103EC063 from RS Components part no. 339-8114, available through Allied telephone sales]

C403       0.1uf 50V Ceramic    [NTE 89410] [Vishay Cera-Mite HY950]

C404       0.1uf 50V Ceramic

C405       100uf 16V Electrolytic    [Allied 852-7079], [Radio Shack 272-1044]

C406       0.1uf 25V Ceramic        [Allied 926-3418] [Vishay Cera-Mite HY850]

C407       0.1uf 25V Ceramic

C408       22uf 16V Electrolytic    [Allied 852-6640]

C409       0.1uf 25V Ceramic

C410       22uf 16V Electrolytic

C411       0.01uf Polypropylene Across-the-line RFI Suppression Line Filter X-Capacitor [Vishay F1772 Class X2]

 

Q401       2SC945

Q402       2SC1419    [NTE 152, TIP 31A (Allied 935-0995)]

Q403       2SC945

Q404       2SA733

Q405       2SB514    [NTE 153, TIP 32A (Allied 935-1000)]

Q406       2SA733

 

D401       Hitachi U05B Glass Bead Rectifier Diode 100V    [Radio Shack 276-1143, 3A, 200PIV for 120VAC USA only use]

D402       Hitachi U05B Glass Bead Rectifier Diode 100V    [Radio Shack 276-1144, 3A, 400PIV for 120VAC - 220VAC international use]

D403       Hitachi U05B Glass Bead Rectifier Diode 100V

D404       Hitachi U05B Glass Bead Rectifier Diode 100V

 

IC401       RC4558P

IC402       TL431CP

 

2A 250v Fast Blow Fuses (2)

Spring loaded single pole on-off push switch

Wrapping Posts #’s 13, 14, 15, 16 and 17

Six Lead wire set soldered to PCB #’s 1, 2, 3, 4, 5 and 6

Two single TO-220 Heat Sinks

 

Flat Post 12            No Connection

Flat Post 10            Big red wire

Flat Post 9              Small red wire

Flat Post 11            Big white wire

Flat Post 8              Small white wire


Kenwood L-07D Switching PCB (X27-1390-00) Components and Values

R301        1M

R302        1M

RA302     10K SIP Resistor Network  10 Leads for 5 Resistors

R303        680 (1/2 watt)

R304        680 (1/2 watt)

R305        10K

R306        10K

R307        10K

R308        10K

 

RA301     10K SIP Resistor Network  12 Leads for 6 Resistors

RA302     100K SIP Resistor Network  10 Leads for 5 Resistors

 

C301       0.01uf Mylar

C302       0.01uf Mylar

C303       0.47uF 50V Electrolytic    [NTE NEV.47M50AA]

C304       0.47uF 50V Electrolytic

C305       0.01uf Mylar

C306       0.01uf Mylar

C307       22uf 16V Electrolytic    [Mouser 647-UVZ1J220MDH]

 

IC301       CD4011BE

IC302       CD4027BE

 

Q301        C2021S:Q

Q302        C2021S:Q

Q303        C2021S:Q

Q304        C2021S:Q

Q305        C2021S:Q

 

D301        GREEN L.E.D. FOR 45 RPM       [Calrad Electronics Part Number 92-120-GN]

D302        RED L.E.D. FOR 33 RPM            [Calrad Electronics Part Number 92-120-RD]

D303        GREEN L.E.D. FOR 45 RPM       [Calrad Electronics Part Number 92-120-GN]

D304        RED L.E.D. FOR 33 RPM            [Calrad Electronics Part Number 92-120-RD]

D305

 

PLAY/STOP SWITCH

SPEED SWITCH


Kenwood L-07D Connector PCB (X25-1550-00) Components and Values

 

R1            100K

R2            1M (Service manual incorrectly list this resistor as 680K)

R3            100K

R4            680K (Service manual incorrectly list this resistor as 1M)

R5            100K

R6            1K

R7            1K

R8            1K

R9            1K

Beware of factory defect PCB that is missing R4!!!   Unit will intermittently not quartz lock at 33 RPM! 

 

C1            10uf 16V Electrolytic    [Allied 998-1369]

C2            10uf 16V Electrolytic

C3            10uf 16V Electrolytic

C4            10uf 16V Electrolytic

C5            0.1uf 25V Ceramic     [Mouser 80-C052C104K5R molded or Allied 926-3418 ceramic] [Vishay Cera-Mite HY850]

C6            0.1uf 25V Ceramic

 

IC1           TA7136P    [Obsolete, can substitute with TA7136AP which is also obsolete]

IC2           TA7136P

 

Q201        2SC945

Q202        2SD882    [Obsolete]

 

D1            W06B                             [NTE-116] (Low Power switching 600V general purpose Silicon rectifier diode)

 

L1             180 uH Inductor             [TOKO 822MY-181K avail. from Digi-Key TK4482-ND]

L2             180 uH Inductor             [TOKO 822MY-181K avail. from Digi-Key TK4482-ND]


Kenwood L-07D Motor - Wiring and Measurements

PH-1:

1 Grey – Power to deep coil

2 Black – Common ground to both coils

3 Red – Power to superficial coil

4 Blue – Power to deep coil

5 Green – To pin 2 of rear Hall element

6 Orange – To pin 4 of rear Hall element

7 Yellow – To pin 2 of front Hall element

8 Brown – To pin 4 of front Hall element

9 Violet – To pins 3 of both Hall elements

10 Grey – To pins 1 of both Hall elements

 

Resistances of coils:

Superficial = 14.9 ohms

Deep = 14.8 ohms

 

Typical resistances of Hall elements:

Pins 1-2              250 - 350

Pins1-3               166 (330 in series)

Pins 1-4              250 - 320

Pins 2-3              250 - 500

Pins 2-4              330 - 440

Pins3-4               250 – 320

 

PH-2:

Red & Black wires to outer coil of bottom PCB

Blue & White wires to inner coil of bottom PCB

 

Pins 1-2 = 2.1 ohms

Pins 3-4 = 2.4 ohms

 

Hall elements:    [Asahi  HW-300A]     PDF info sheet:  http://www.asahi-kasei.co.jp/ake/en/ms/pdf/hw300a.pdf

Note: Hall elements used in the motor are SMD's (Surface Mount Devices).  A low-voltage soldering station with a very fine-tip iron, and magnification, are recommended for Hall element replacement work.  Trim Hall element leads to length of original before soldering.  This task requires advanced soldering skills.

 

Operation:

Hall element 1 controls motor coil A   

Hall element 2 controls motor coil B

During start and stop, both coils are energized together.

Once quartz lock is attained, the coils only get energized alternatively; i.e. coil A on, B off and vice-versa. 

This ensures a smoother motor operation as now the rotational energization is passed on from one star tip to the next in succession.


Kenwood L-07D Logic PCB IC Continuity List. 

This table lists the next point in the continuity chain for each IC pin.  Use this list to check for open circuits before/after IC replacement.  Also use to check any IC’s previously replaced.  For resistors and capacitors, a continuity tester will read continuity on only one side of the resistor or capacitor.  If a continuity tester reads open circuit on both sides of the resistor or capacitor, that would indicate a fault (open circuit).  Always check adjacent pins on IC’s for shorts due to soldering.  I prefer to use sockets when replacing IC’s.  I prefer low profile IC sockets.  On a good board, the solder will flow through from bottom to top and catch the top trace.  Use flux on both top and bottom traces.  Solder wick works best for de-soldering.

This list was made based upon schematics in the service manual and large schematic, and verified with continuity tester testing on a properly working PCB.

IC1 Pin 1            IC4 Pin 2

IC1 Pin 2            (Q- of J-K Flip-Flop A), IC4 Pin 14

IC1 Pin 3            Pin 8 of RA4 (H: Brake Signal)

IC1 Pin 4            Pin 2 of PH3, via pin 9 of RA5

IC1 Pin 5            IC1 Pin 8

IC1 Pin 6            IC4 Pin 15

IC1 Pin 7            C101

IC1 Pin 8            IC1 Pin 5, R102,

IC1 Pin 9            IC3 Pin 4

IC1 Pin 10          IC2 Pin 3,

IC1 Pin 11          IC3 Pin 15

IC1 Pin 12          IC2 Pin 2         

IC1 Pin 13          C101, R101

IC1 Pin 14          Pin 1 of PH2

 

IC2 Pin 1            TPF, IC4 Pin 6

IC2 Pin 2            IC1 Pin 12

IC2 Pin 3            IC1 Pin 10

IC2 Pin 4            IC4 Pin 12

IC2 Pin 5            IC7 Pin 12 & 13, Pin 6 of RA5

IC2 Pin 6            Pin 2 of RA5

IC2 Pin 7            C101, Pin 2 of PH2

IC2 Pin 8            IC4 Pin 13

IC2 Pin 9            R102, C102

IC2 Pin 10          IC4 Pin 6, TPF

IC2 Pin 11          D1

IC2 Pin 12          IC4 Pin 5

IC2 Pin 13          D2

IC2 Pin 14          IC3 Pin 16, Pin 1 of PH2

 

IC3 Pin 1                                 (IC3 is a 1/5 Octal Counter)

IC3 Pin 2

IC3 Pin 3

IC3 Pin 4            IC1 Pin 9

IC3 Pin 5

IC3 Pin 6

IC3 Pin 7

IC3 Pin 8            IC3 Pin 13

IC3 Pin 9

IC3 Pin 10      

IC3 Pin 11

IC3 Pin 12

IC3 Pin 13          IC3 Pin 8, IC4 Pin 4, Pin 2 of PH2

IC3 Pin 14(Clock)           Collector of Q1

IC3 Pin 15(Reset)            R103, IC1 Pin 11

IC3 Pin 16          IC2 Pin 14, Pin 1 of PH2

 

IC4 Pin 1            (Q of J-K Flip-Flop B)                                (IC4 is a J-K Flip-Flop)

IC4 Pin 2            (Q- of J-K Flip-Flop A)        IC1 Pin 1

IC4 Pin 3                                                         R103

IC4 Pin 4            (R of J-K Flip-Flop B)          IC3 Pin 13, Ground

IC4 Pin 5            (K of J-K Flip-Flop              IC2 Pin 12

IC4 Pin 6            (J of J-K Flip Flop B)           TPF, IC2 Pin10

IC4 Pin 7            (S of J-K Flip-Flop B)          Ground,

IC4 Pin 8                                                         IC4 Pin 4 & Pin 7

IC4 Pin 9            (S of J-K Flip-Flop A)          Emitter of Q1, IC4 Pin 8

IC4 Pin 10          (J of J-K Flip-Flop A)           IC4 Pin 11, +15.2V

IC4 Pin 11          (K of J-K Flip-Flop A)         IC4 Pin 10, +15.2V     

IC4 Pin 12          (R of Flip-Flop A)                 IC2 Pin 4

IC4 Pin 13          (C of J-K Flip-Flop A)          IC2 Pin 8

IC4 Pin 14          (Q- of J-K Flip-Flop A)        IC1 Pin 2

IC4 Pin 15          (Q of J-K Flip-Flop A)         IC1 Pin 6

IC4 Pin 16                                                       IC4 Pins 10 & 11, +15.2V

 

IC5 Pin 1            R105

IC5 Pin 2            R106

IC5 Pin 3            R108

IC5 Pin 4            Pin 3 of PH3, -15.2V

IC5 Pin 5            R109

IC5 Pin 6            R110

IC5 Pin 7            R111, R104

IC5 Pin 8            Pin 1 of PH2, +15.2V

 

IC6 Pin 1            (CP In)             IC6 Pin 15

IC6 Pin 2            (V/S Out)         R148

IC6 Pin 3            (V/S In)            IC8 Pin 4

IC6 Pin 4            (FG In)             R113 and R115

IC6 Pin 5            (F/V RC)          R116, Base of Q2, C106

IC6 Pin 6            (f/V HC)           C105

IC6 Pin 7            (F/V Out)          R149

IC6 Pin 8            (LD Out)           Pin 2 of RA4 and then Pin 11 of PH3

IC6 Pin 9            (Ground)           C109, C110   Ground

IC6 Pin 10          (P/D Out)          R151

IC6 Pin 11          (P/D HC)          C110

IC6 Pin 12           (P/D RC)         TPR

IC6 Pin 13           (1/20 – 1/27 Select)             R112, R114

IC6 Pin 14           (ST Out)          Pin 8 of RA 5

IC6 Pin 15          (CP Out)          IC6 Pin 1

IC6 Pin 16          (X-Tal)            5.5296MHz X-Tal (C103 side)

IC6 Pin 17          (X-Tal)            5.5296MHz X-Tal (C104 side)

IC6 Pin 18          (VDD)             D4, Pin 6 of PH2, +8V

 

IC7 Pin 1            IC7 Pin3

IC7 Pin 2            R150

IC7 Pin 3            IC7 Pin1

IC7 Pin 4            R149

IC7 Pin 5            IC7 Pin 6, IC2 Pin 6

IC7 Pin 6            IC7 Pin 5, IC2 Pin 6

IC7 Pin 7            R118

IC7 Pin 8            R151

IC7 Pin 9            IC7 Pin 11

IC7 Pin 10          R152

IC7 Pin 11          IC7 Pin 9

IC7 Pin 12          IC7 Pin 13, IC2 Pin5

IC7 Pin 13          IC7 Pin 12, IC2 Pin5

IC7 Pin 14          Pin 9 of RA2

 

(IC8 is a Clock Interface/Quad Switch/Both-Way Analog Switch)

IC8 Pin 1            C115  

IC8 Pin 2            C115 (other side of C115), IC10 Pin 1 (on Logic cards without R192 &R193)                  

IC8 Pin 3            VR2 (45rpm)                                       Switch A = Pins 1,2,13

IC8 Pin 4            IC8 Pin 9, IC6 Pin 3                            Switch B = Pins 3,4,5

IC8 Pin 5            Collector of Q6

IC8 Pin 6            Collector of Q5                                   Switch C = Pins 6,8,19

IC8 Pin 7            Pin 5 of RA-1, D6

IC8 Pin 8            VR1 (33rpm)

IC8 Pin 9            IC8 Pin 4, IC6 Pin 3

IC8 Pin 10          C117                                                  Switch D = Pins 10,11,12

IC8 Pin 11          C117 (other side of C117)

IC8 Pin 12          Pin 13 of IC8, Collector of Q7

IC8 Pin 13          Pin 12 of IC8, Collector of Q7

IC8 Pin 14          R120, Emitter of Q7, D5

 

IC9 Pin 1            R159, R160

IC9 Pin 2            Emitter of Q9

IC9 Pin 3            R148, Pin 8 of RA2

IC9 Pin 4            R121, Collector of Q13

IC9 Pin 5            Pin 1 of RA2

IC9 Pin 6            D7, D8

IC9 Pin 7            Pin 3 of RA2

IC9 Pin 8            R162, Pin 9 of RA2, Collector of Q12

 

IC10 Pin 1          SC-1 Gain (VR-3), C115 on , IC8 Pin 2 on on Logic cards without R192 &R193

IC10 Pin 2          R123

IC10 Pin 3          R185

IC10 Pin 4          R121, R161, IC11 Pin 4, -15.2V

IC10 Pin 5          R168

IC10 Pin 6          Pin 7 of RA-1, R122

IC10 Pin 7          R130

IC10 Pin 8          R120, +15.2V

 

IC11 Pin 1          R128, C117 on Logic cards without R192 &R193

IC11 Pin 2          Other side of R128

IC11 Pin 3          R182

IC11 Pin 4          IC10 Pin 4, -15.2V

IC11 Pin 5          R191

IC11 Pin 6          R127

IC11 Pin 7          R131

IC11 Pin 8          R120, +15.2V


Connector Continuity Data

The following continuity information is useful for tracing problems in the umbilical between the Control Unit and the Turntable connector.  This information is also useful if a bad connection or adjacent connector short occurs inside the main connector, and a wire needs to be directed to a different pin:

Inside the X25-1550-00 Connector PCB receptacle, the 24 pins are defined in four rows labeled A through C and six columns labeled 1 through 6.

Inside the X25-1550-00 Connector PCB receptacle, the following pins are in continuity:

B2 to B3 to B4

A6 to D1

D2 to D3

 

On the logic PCB, the following pins are in continuity:

 PH1 pin1 to PH1 pin 2 to PH1 pin 9

 

The following table indicates the continuity points for the umbilical wiring:

 

A1 to pin 6 of PH3

A2 to pin11 of PH3

A3 to pin 9 of PH3

A4 to pin 1 of PH3

A5 to pin 2 of PH3

A6 to pin 4 of PH1

 

B1 to pin 5 of PH3

B2 to pin 4 of PH3

B3 no connection

B4 no connection

B5 to pin 6 of PH1

B6 to pin 5 of PH1

 

C1 to pin 3 of PH3

C2 to Pin 7 of PH3

C3 to pin 10 of PH3

C4 no connection

C5 no connection

C6 to pin 7 of PH1

 

D1 to pin 1 of PH1

D2 to pin 2 of PH1

D3 to pin 3 of PH1

D4 to pin 10 of PH1

D5 to pin 9 of PH1

D6 to pin 8 of PH1

 

Pin 1 of PH1 to D1

Pin 2 of PH1 to D2

Pin 3 of PH1 to D3

Pin 4 of PH1 to A6

Pin 5 of PH1 to B6

Pin 6 of PH1 to B5

Pin 7 of PH1 to C6

Pin 8 of PH1 to D6

Pin 9 of PH1 to D5

Pin 10 of PH1 to D4

 

Pin 1 of PH3 to A4

Pin 2 of PH3 to A5

Pin 3 of PH3 to C1

Pin 4 of PH3 to B2

Pin 5 of PH3 to B1

Pin 6 of PH3 to A1

Pin 7 of PH3 to C2

Pin 8 of PH3 no connection

Pin 9 of PH3 to A3

Pin 10 of PH3 to C3

Pin 11 of PH3 to A2


Kenwood L-07D Faults Associated with a Failed Component

Unit starts without pushing operation button, speed indicator momentarily hits GREEN but continues to speed up and stays RED, pushing operation button does not stop unit – Bad IC2.

Solenoid clicks when powered up at 33 rpm before operation button is pushed.  If operation button is pushed (at 33 rpm) unit will quartz lock.  If operation button is pushed again, unit will stop and solenoid will resume clicking once platter stops.  If switched to 45 rpm, unit will turn backwards and will not stop when operation button is pressed again. - Bad IC 2.

Unit starts but speed indicator never turns GREEN, platter over-speeds.  Operation button slows platter with much less force than normal - Bad IC 2.

Unit starts and quartz locks normally at 33 and 45 rpm.  When operation button is pushed mechanical brake chatters (Solenoid clicking) and works ineffectively.  Mechanical brake chatter stops when platter stops. - Bad IC 2.

Unit powers on normally with platter motionless before operation button is pushed.  Engagement of solenoid brake occurs almost silently at power-up, without the usual audible click.  Unit will quartz lock when operation button is pushed.  When operation button is pushed again, platter will slow to a stop and then continue to rock back and forth, brake solenoid doesn't deploy.  Pushing operation button again, unit will play and quartz lock, but same phenomenon when the operation button is pushed again; platter will slow to a stop and then continue to rock back and forth, brake solenoid doesn't deploy - Bad IC 3.

Speed indicator flashes RED-GREEN, runs at correct speed but won’t quartz lock – Bad IC 6.

When the Operation button is pushed, the platter gradually increases speed but over-speeds.  Speed indicator doesn’t turn GREEN.  Pushing the Operation button again results in platter stopping a few minutes later (Mechanical brake correctly activates with click sound and platter stops) - Bad IC 7.

Motor buzzing when platter is stopped due to electronic brake remaining on - Bad Q23.

Platter gently rocks back and forth at startup, but will not spin.  If started with a push, it will spin but will not quartz lock - bad C102.

Speed indicator flashes RED-GREEN and depending on the position of the rotor platter will start alone or just rock backward and forward - bad C119 allowing DC on the B winding.

Unit goes to hyper-speed, speed indicator never flashes GREEN.  Brake works properly – Bad L1 and L2 inductors on X25-1550-00 Connector PCB.

Unit occasionally won't quartz lock at 33 rpm - Check for factory defect in X25-1550-00 Connector PCB.  I have found one made without R4.

Unit starts and plays normally.  Only problem is clattering sound from motor during electronic braking.  Braking function is otherwise normal. - Bad capacitors on X25-1550-00 Connector PCB.  Replace 0.1uf Ceramic capacitors (2), replace and upgrade 10uf electrolytic capacitors (4).

Unit starts and plays normally.  Only problem is mechanical brake engages as soon as Operation button is pushed to stop platter rotation. Braking function is otherwise normal including electronic braking.  (Mechanical brake is not supposed to engage until electronic brake has slowed platter to 1/5 of operating speed,) – Bad IC 2.

Platter over-speeds momentarily for about 1/2 turn (kick) before it returns to lock mode.  This happens every 10-15 sec.– Bad front Hall element.

Poor start-up torque – Bad rear Hall element.

Rubbing sound in motor - Possibility #1: Magnetic pad has de-laminated from underside of rotor.  Do not run unit until repairs are made.  Possibility #2: Thrust bushing wear has allowed rotor to rub mag-lev PCB.  Repair by disassembling thrust bushing mechanism.  Flip bushing over to expose unworn side and reassemble with a new O-ring and lubricate bearing.  Do not run unit until repairs are made.

When the unit is powered up, both speed indicators (33 & 45 RPM) are on at same time (RED) instead of one.  When the speed button is pressed, 33 RPM speed indicator turns off, 45 RPM speed indicator remains on (RED), press the speed button once again and 33 & 45 RPM are again on at same time (RED).  (45 RPM speed indicator never turns off.)  Unit will only play at 33RPM, either with speed indicator reading 45 RPM quartz lock (GREEN) but actual speed is 33 RPM, or if speed button is pushed will again quartz lock at 33 RPM with both speed indicator LEDs staying on at the same time  (33 & 45 RPM speed indicators both (GREEN).  (45 RPM speed indicator never turns off.) – Bad IC 301 and 302 on switching PCB.

PLL waveform not stable, noise in AC signal driving the motor - Bad 0.001 uf capacitor.


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