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K-501A
Ref. No. 3718 112001

SERVICE MANUAL

CASSETTE TAPE DECK MODEL K-501A

UPP UDT UGT SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ON THE

230-240V AC, 50Hz 120V AC, 60Hz 220-230V AC, 50/60Hz

SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE THESE COMPONENTS WITH ONKYO PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL. MAKE LEAKAGE-CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER.

K-501A SPECIFICATIONS
Track format 4-tracks, 2-channels Erasing system AC erase Tape speed 4.8 cm/sec.
Wow and flutter

Power supply rating AC 230-240 V, 50 Hz AC 220-230 V, 50/60 Hz AC 120 V, 60 Hz Power consumption 13 W (230-240 V, 50 Hz) (220-230 V, 50/60 Hz) 14 W (120 V, 60 Hz) Dimensions (W x H x D) 155 mm x 94 mm x 303 mm 6-1/8" x 3-11/16" x 11-15/16" (AC 230-240 V,50Hz) (AC 220-230 V,50/60Hz) 155 mm x 94 mm x 297.5 mm 6-1/8" x 3-11/16" x 11-11/16" (AC 120 V , 60Hz)

0.1 % (WRMS) 0.2 % (DIN) Frequency response Metal position tape 30 to 15,000 Hz 3 dB High position tape 30 to 14,000 Hz 3 dB Normal position tape 30 to 13,000 Hz 3 dB

Weight Signal to noise ratio 2.5 kg, 5.5 lbs 54 dB (metal position tape, Dolby NR off) Specifications and external appearance are Noise reduction of 10 dB above 5 kHz subject to change without notice as a result of and 5 dB at 1 kHz is possible with Dolby product improvement. B NR. Noise reduction of 20 dB at 5 kHz is possible with Dolby C NR. Input Jacks LINE IN: 2 Input sensitivity: 500 mV Input impedance: 50 kohms Output Jacks LINE OUT: 2 Standard output level: 500 mV Output load impedance: over 50 kohms Motors DC servo motor: 1 Heads REC/PB: Special Hard Permalloy: 1 Erase head: Ferrite: 1

SERVICE PROCEDURES
CIRCUIT NO. F901 PART NO. 252074 DESCRIPTION 2A-SE-EAK,Fuse

...Europian model only
...120V model only ...220-230V model only

K-501A PANEL VIEW
FRONT PANEL

STANDBY/ON button STANDBY indicator

/

Rec/Pause button Rec/Pause indicator

FADE button/FADE indicator Cassette in indicator

ALBUM button/ALBUM indicator Eject button
STEREO CASSETTE TAPE DECK

CASSETTE LOADING MECHANISM

B STANDBY / ON

C CD DUBBING ALBUM FADE

DOLBY NR REV MODE

STANDBY

K- 5 01A

DOLBY NR indicator DOLBY NR button

Cassette slot

Stop button

REV MODE indicator REV MODE button

, Forward/reverse side play button

Auto space button

, Fast-forward/Rewind Skip button

K-501A EXPLODED VIEW
P901A A9 S1 P101A A16 P702A A15 A19 P703A S2 U2 T901 A17 A7 S1 U3 S1 A4 S1 S1 A1 A12 A2 A5 Z1 A6 A3 A13 A2 A14 S3 S4 A18 U1

F901

S1

A8

A17

A11

A10

K-501A PARTS LIST
EXPLODED VIEW

REF. NO. A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18

A19 F901 P101A P702A P703A P901A

T901

U1

U2

U3

Z1 S1 S2 S3 S4

PART NO. 27111266 27191165 28198948 28148505 27180583 28325983 27100415 27191164 27300750 27212366 28198939 28198946 28198947 28184832 28140079 28141492 28141489 27122947A 27122948A 27122949A 260208 252074 2009990714 20022392618 20022391010 253334HRK 253331HDK or 253330MIL 2301571 2301572 2301573 1N283583-1B 1N283583-1C 1N283583-1D 1N283584-1B 1N283584-1C 1N283584-1D 1N283585-1B 1N283585-1C 1N283585-1D 244248A 838130088 830440089 838930088 838430088

DESCRIPTION
Front bracket Holder (Door) Facet(IN) Door Spring Recording button ass'y Chassis Holder (Mechanism) #2271,Bushing Front panel Facet(S) Facet(PLAY) Facet(NR) Cover Cushion Cushion Cushion Rear panel
Rear panel Rear panel Binder 2A-SE-EAK,Fuse NSAS-14P0999,Socket ass'y NSAS-26P0998,Socket ass'y NSAS-10P0997,Socket ass'y AS-CEE,Power supply

cord

AS-UC-2,Power supply cord
AS-UC-2,Power supply cord
NPT-1434D,Power Transformer
NPT-1434G,Power Transformer NPT-1434P,Power Transformer NAAF-7383-1B,Main circuit PC board
NAAF-7383-1C,Main circuit PC board NAAF-7383-1D,Main circuit PC board NAPS-7384-1B,Power supply PC board
NAPS-7384-1C,Power supply PC board NAPS-7384-1D,Power supply PC board NADIS-7385-1B,Display circuit PC board
NADIS-7385-1C,Display circuit PC board NADIS-7385-1D,Display circuit PC board CMAL2Z815A,Cassette Mechanism 3TTB+8B,Self tapping screw 4TTC+8C(BC),Self tapping screw 3TTB+8B(UN),Self tapping screw 3TTB+8B(BC),Self tapping screw
Note ...Europian model only
...120V model only ...220-230V model only THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.

K-501A EXPLODED VIEW
CASETTE MECHANISM

F REC

METAL PACK C R REC

PARTS LIST
REF.NO 1 2 3 4 5 6 7 8 9 10 PART NO. FF18WFF19YF567-626 FF26KF513-891 F514-129 F514-130 F522-064 F522-052 FD52YDESCRIPTION F/R belt Main belt Switch PC board ass'y Flywheel ass'y Recording/Play head ass'y Pinch roller R Pinch roller L Clutch Clutch Master cam

K-501A

BLOCK DIAGRAM

P.B.AMP. P.B.LEVEL R/P HEAD Q102
X

DOLBY NR,REC EQ,METER AMP

KEY CONTROL&DISPLAY D801-D810

Q201 R115,R116

Q101

70/120 Q103,Q104

IN LINE OUT BIAS OSC and HX PRO Q401 Q405

ERASE HEAD
X

MICROPROCESSOR

L401,L402,L403 Q701 S717 AUTO ADJUSTMENT START KEY Q705 Q706 Q712 TAPE SPEED R716 5V(for MICROPROCESSOR) Q905 Q713 Q703 Q704 MECHA and DRIVER

POWER TRANSFORMER and REGULATOR 12V(for SIGNAL) T901 D901,D902 Q901 12V(for MECHA) Q903

-22V(for FL tube) D905,D906 Q906

K-501A

K-501A
A B C D

SCHEMATIC DIAGRAM 1
C243 1000/16 222 104 R272 100K R221 R283 R284 OUTPUT(R) DTA114YS 4.7K C248 104 4.7K 4.7K Q206 2SD655 R220 1.8K R268 1K R285 INPUT(L) 4.7K 4.7/50 10/16 C222 10/16 EQCONT[R48 ] 10K D G N D4 7 14IREF C224 R210 E Q O U T [ R4 6 ] 15EQOUT[L] EQIN[R] 49 13EQCONT[L] 10/16 R279 C221 R273 R 2 2 31 2 K 12K 12K P706 C233 4.7/50 16N NORM NR ON/OFF5 4 C235 UDZS4.7B D203 104 INPUT(R) R270 6.8K 2.2/50 C218 C214 104

C208

C210

C212

Q204 DTA114YS

C282

C283

P204

LINE MUTE

2.2/50 R103 470 MPC1228HA R ch R101100K 8 7 6 5 C101 681 C104 2.2/50 R104 470 Q102 L ch 4 3 2 1

C216

B I A _ T R A P R6 0

RECOUT[R]53

LMDET[R]51 10LMDET[L]

SS1R 58

CCRR 56

HLSR 55

SS2R 57

LLSR 54

PBOUT[R]59

LMIN[R] 52

1 2 3

R218 6.8K 61 62 63 64

R222

18K

R216

3.3K

C232 R112 1.5K C110 10/16 R106 390K 120(1/2W) 470/16 R108 15K R107 15K C113 R105 390K C109 10/16 R111 1.5K R119 1.5K C228 R214 2.2K R213 R115 47KB C246 153 2.2K C227 R212 R211 C230 1/50 C226 68K 68K C225 1/50 C229 C231 R215

10/16 10/16 10/16

65 RPI[R]PBIN 66 67 VRI2[R]ACCUIN 68 CONT[R] 69 VRI1[R]LINEIN 70 GND2 71 GND1 72 VRI1[L]LINEIN 73 CONT[L] 74 VRI2[L]ACCUIN 75 76 RPI[L]PBIN 77 1 BIA_TRAPL 79 11LMOUT[L] 1 2 3 4 5 6 7 8 9 10 11 12 13 2 PBOUT[L] 78 80 8 RECOUT[L] Q201 HA12169FB

X

R120

C102 681 R102 100K R116 47KB

1.5K

C106 822 R114 C112 3.9K

C105 822

P.B.LEVEL R113 3.9K

P101

X

10/16 10/16 10/16 3.3K

D T C 1 1 4 T SC 1 1 1

DTC114TS 183

100/16 R117 R109 120

Q104 X P.B.LEVEL

R110 120

R/P

70/120

R217 6.8K

1/50

C215

R201 C203

22K 560 C205 222

R219 1K 1.8K Q205 2SD655

222

R205 6.8K C219

6.8K

Q101

MPC1330HA

10/16

R203

R269

C241

R118

R267 1K

10/16

R271
LEVEL_R

100K

C207 222

REC R

REC L

C209

C211

R276

C281

C406

C404 471

C412 121/100 L402 NCH-4183 4 3 2 6 1 C408 273 C410 101/100

273

C413 8.9 R402 100K 100/16 (1/2W) R409

C426 680 C424 681 L406 4.7MH

Q207 DTC114YS
OSC

R281

120

1K

R404 330K

C402 103

C247 394

1/50

400/12K

330K

R275 1K

390K

REC_MUTE

REC_R

3

R274

10

11

12

13

14

15

16

17

18

OSC_OUT

CLK

DO

STB

DAC_R

DAC_L

LEVEL_L

Q401

MPC1297CA

REC_R

NCH-4183

L401

R401 C407 C401 103 273 100K C422 10/16 R406 3.3K
REC_L DAC_R

47 (1/2W)

3 C414 47/16 4

2

1 6

DAC_L

R410

C405

C411 121/100

273

R407 22K

R405 3.3K

R408

22K

330K

C403 471

C409 101/100

R403

RESET

REC_L

9

8

7

6

5

4

3

2

1

L405 C421 100/500 R413 10 (1/2W) C423 C425

4.7MH 681 680 R411 39K C415 220/6.3 12V

472

C416 472

R 4 1 43 9 K

Q405 2SC1213C 183 C418 223

2SA950

5

2

C417

R412 5.6K
70/120

6

C427

R416 4.7

123/100

R415

C420

P401

R417

4
P

4.7

L403 NLO-2059 C419 47/16

1

Q403

R418 39K 4 3

BIAS ON/OFF
BIAS_CONT R/P

Q404 2SC1213C

39K

Q402 DTC114YS

PING

MUT

12V1

NAAF-7383

P903A

U2 Power supply circuit PC board
P901A T901 NPT-1434* AC-H
AC0

P903 R917 10K D910 5.6V R916 UDZS5.6B 560 Q901 78M12 1SS352 D909 1SS352 C916 10/16 I G O
+12VSIG

C917 104

E854 5.6

12V D908

C907

GND2

12V3

12V2

GND3

R725 330K C701 2.2/50

Q711 DTA114YS

R914

R915

470

C901 104

1000/16 470

AC1

AC1

F U S EE A5A U S E_ B F U A / 2_ 0 V E B F 2 S FUS

P901

F901 F 9 0 1 AF 9 0 1 B

104

AC-G

C903

5

2

5 6
AC2 AC2

D901 GP1N4003 D902 I GP1N4003 22V

Q903 78M12 G O

12V 223 R726 C702 3.9K Q710 DTC114YS D706
DC1

4

7

C703 223

AC0

Q905 78M05 1000/16
DC1

C 9 0 41 0 4

P902

GND

NC: No used

NAPS-7384

C915

4700/25

100/16

* NPT-1434D
NPT-1434G NPT-1434P

C909

I

G

O

C905

1SS352

P706A

C223

C217 2.2/50

R207 1K

C213 104

10/16

104

104

R/P

R209

C114

1/50

10K

L203 NMC-6079

9

8

7

6

5

4

3

2

1

12EQIN[L]

9 LMIN[L]

2

183

P

C108 100/16

C107

70/120

70/120

Q103

C238 1/50

5 CCRL

3 2 1

4 5 6

6 HLSL

4 SS2L

3 SS1L

7 LLSL

LMOUT[R]50

R278 10K

NMC-6079 6 5 4

1/50

L204

R202

22K

R204

C103

NC

C204 222

C206 222

R206

U1 Main circuit PC board

Q203

OUTPUT(L)

C242

560

R208

223

223

6.8K

C220

1

10/16

1K

1/50

K-501A
A B
P205TEST POINT RCH LCH

C
NOTE
. THE COMPONENTS IDENTIFIED BY MARK A R EC R I T I C A L F O R S A F E T Y

D

SCHEMATIC DIAGRAM 2
U1 Main circuit PC board
C234 R272 100K 4.7/50 4.7/50 Q210 C237 4.7/50 R280 1M R224 12K 4.7/50

R E P L A C EO N L Y W I T H P A R T N U M B E R S P E C I F I E D . . V O L T A G E( M E A S U R E D W I T HV O L T M E T E R ) I S D C V O L T A G E (. N O I N P U T S I G N A L ) . ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED. . ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED. . ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED. . ELECTROLYTIC CAPACITORS ( ) ARE IN uF/WV. . ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED. EX) 030-3pF 330-33pF 331-330pF 333-0.033uF . ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED. . THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS. EX) PRINTING SIDE . CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT.

10/16

1/50

C235

C220

C224

1

C236

DTC114TS

1K

6.8K

NC:Noused

C222 10/16 R233 10K R232 R210 10K D202 1SS352 10K R228 10K C250 223 R231 10K 39 38 REC R229 R266 P705 3.3K 56K R264 47K R809 270 D805 SEL6910D STANDBY R810 470 D806 SLV332VR DOLBY C C239 104 R812 R804 R803 470 R805 R225 100K 820 P705A R806 470 D810 D802 470 D809 470 D808 SEL6910D DOLBY B SEL6910D TAPE IN SEL6910D R.PLAY SEL6910D F.PLAY NC R255 2.2M R244 56K R282 12K 1M DTC114TS R273 Q209 2.2M 12K NC R245 2.2M R235 47K NC R236 100K R248 R247 68K 68K R237 100K R238 33K R239 33K R249 39K NC R2512.2M R241 82K NC R253 390K R242 100K DOLBY NR R814 NC R240 2.2M R243 NC 2.2M REV.MODE R815 R227 10K C249 223 S804 AUTO SPACE S805 REC/PAU S811 STOP S812 R822 ALBUM
LEVEL_R

EQCONT[R4 8 ]

D G N D4 7

E Q O U T [ R4 6 ]

EQIN[R] 49

C/B 44

NR_ON/OFF5 4

RST42

M P X4 3

LMIN[R] 52

LMDET[R]51

LMOUT[R]50

DATA 40 CLK INJ R265 47K R230 10K R807 470 D803 SEL6910D

STB 41

U3 Display circuit PC board
FADE R808 270 D804 SEL6910D ALBUM

1/50

BIASADJ[H] 37 BIASADJ[M] 36 BIASADJ[N] 35 GND 34 BIASCONT[R] 33 Q201 HA12169FB VCC2 VCC1 31 30 DACOUT[R]32

12V

DACOUT[L] 29 BIASCONT[L] 28 FM 27 FQ 26 F/Q 25 GH 24 13EQCONT[L] 11LMOUT[L] 10LMDET[L] 15EQOUT[L] 16N.NORM

C240 104

R226

100K

R811

470

D807

SLV332VR REV.MODE

12EQIN[L]

9 LMIN[L]

17N.HIGH

18N.MTL

2

GL 23 GP 22 21 19 20

14IREF

R802 R260 68K NC R261 2.2M R250 82K R262 390K NC R263 2.2M R252 390K

470 820

R254 56K 1SS352

R256 68K NC R257 2.2M R246 680K R258 82K

R259 33K

R801

D201

1/50

10K

1/50

R209

10/16

C233

4.7/50

D801

SEL6910D

R205 6.8K C219

100K

GND4

S806 S801 R813 STBY 390 S802 S807 R817 R818 R819 R.PLAY S809 R820 F.PLAY R821 R823 FADE 1.8K 1K FF REW S810 820 LOAD IN LOAD OUT SW GND LOAD IN SW 10K P703 12V GND MTR PLAY SW 5V ROT SEN SOL HIGH SW CASS IN SW R737 10K C704 223 R708 Q703 2SA933 F.REC SW 10K MTL SW R713 Q712 12V CAP DTC114YS 3.9K 2SB1068 R.REC SW 3.9K 390 470 EJECT

R271

C221

R279

R234 R 2 2 31 2 K 10/16

S803

R207 1K

C223

820

470

S808

R816

1K

S813 RI RI

LEVEL_L

P701

3

NADIS-7385
2 C918 3 1 R744 470

L702 1MH

223 R722 D708 390K

U2 Power supply circuit PC board
R750 100K

NC

1MH

5V

L701

C709

104

UDZS5.6B D703 1SS352 R721 47K

S717

FT-1

C711 223 C710 223

Q708 DTA114YS

REV.M 64

A L B U M6 1

D O L _ C6 3

FADE60

REC59

STBY62

KEY3[NC] 55

KEY254

V A R E F5 7

VASS56

KEY153

VDD58

F T5 2

FT-2 R730 R729 R728 R723 2.7K 2.7K 2.7K 2.7K R724 390

P706A

P706

1 DOL_B

LM[R] 51 LM[L] 50

2 TAPE_IN 1 2 3 4 5 6 7 8 9 3 R.PLY1 4 R.PLY2 5 F.PLY1 6 F.PLY2 7 NC1 8 NC2 9 NC3 10 NC4 11 NC5 R735 R736 10K 3.3K 12 NC6 13 NC7 14 DOOR_LOCK_OPEN 15 P-OFF 16 R.REC 25 TEST[VSS] 17 MTL_SW 18 F.REC R702 R703 R704 3.9K 3.9K 24 STB 3.9K 20CLK 23 CS 19 NC8 22 DO 21 DI TMP87CH14F Q701 LED

5V

B I A S _ C O N T4 9 R/P 48 70/120 47 L I N E _ M U T E4 6 O S C _ O U T4 5 400/12K 44 D O L _ R S T4 3 REC_MUTE 2 4 TA7291S O P E N _ S W4 1 C L O S E _ S W4 0 RI_OUT 39 RI_IN 38 ROT.SEN.37 D O O R _ C L O S3 6 E 30 CASS_IN 31 HIGH_SW D O O R _ O P E N5 3 28 XOUT 29 RESET SOL 34 CAP 33 32 PLAY R746 3.9K R745 3.9K R707 3.9K 1 100K LOAD OUT 3 2 R751 7 6 100/16 Q707 5 4 8 R720 1.8K C705 9 UDZS7.5B D702

4

10 11 12 13

26 VSS

R734

R733

R732

R731

2.7K

2.7K

2.7K

2.7K

27 XIN

R718

D T C 1 1 4 Y S3 . 9 K

5V

X701 CST8.00MG

R706 3.9K R705 3.9K SOL R727 3.9K

R717 Q706 2SB1068

47K

TO MECHANISM

Q702 5 YS #1,#8 NC BR93LC46F-WE2 6 7 8

Q713

R716 1SS352 R715 12K 5KB

P702 MTR SPEED A MTR SPEED B

4

3

2

1

TAPE SPEED ADJ.

5
03 3 5V Q704 R709 22K DTC114YS R712 1M

D701

TO MECHANISM
Q705 R714 47K

K-501A
A B C
C243 1000/16

D

E
P205TEST POINT RCH LCH C234 R272 100K 4.7/50 4.7/50 Q210 C237 4.7/50 R280 1M R224 12K

F

G
NOTE
. THECOMPONENTS IDENTIFIED BY MARK

H
A R EC R I T I C A L F O R S A F E T Y R E P L A C EO N L Y W I T H P A R T N U M B E R S P E C I F I E D . . V O L T A G E( M E A S U R E D W I T HV O L T M E T E R ) I S D C V O L T A G E (. N O I N P U T S I G N A L ) . ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED. . ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED. . ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED. . ELECTROLYTIC CAPACITORS ( ) ARE IN uF/WV. . ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED. EX) 030-3pF 330-33pF 331-330pF 333-0.033uF . ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED. . THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS.

SCHEMATIC DIAGRAM
INPUT(R) R285 INPUT(L) R221 R283 R284 OUTPUT(R) 4.7K 4.7K C248 104 4.7K 4.7K

222

R270 UDZS4.7B D203 R220

6.8K R268 1K

Q206 2SD655 1.8K

2.2/50

104

104

4.7/50

C208

C210

C212

C218

C214 104

10/16

1/50

C235

Q204 DTA114YS

10/16

DTA114YS

C282

C283

P204

NC

C204 222 LINE MUTE L204 R278 10K NMC-6079 R202

C206 222 22K

R206

1

Q203

U1 Main circuit PC board
C103 2.2/50 R103 470

OUTPUT(L)

C242

560

R208

223

223

6.8K

C220

C222 10/16 R233 10K R232 R210 10K D202 1SS352 10K R228 10K C250 223 R231 10K 39 38

R204

C224

C236

DTC114TS

1K

C216

EX) PRINTING SIDE . CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT.
NC:Noused REC P705

SS1R 58

SS2R 57

1/50

EQIN[R] 49

CCRR 56

EQCONT[R48 ]

LLSR 54

LMOUT[R]50

B I A _ T R A P R6 0

LMIN[R] 52

LMDET[R]51

E Q O U T [ R4 6 ]

HLSR 55

D G N D4 7

MPC1228HA R ch R101100K 8 7 6 5 C101 681 C104 2.2/50 R104 470

Q102 L ch 4 3 2 1 R222 18K

1 2 3

R218 6.8K 61 62 63 64

RECOUT[R]53

NR_ON/OFF5 4

PBOUT[R]59

6 5 4

M P X4 3

C/B 44

RST42

DATA 40 CLK INJ R229 R266 3.3K 56K R264 47K R809 270 D805 SEL6910D R265 47K R230 10K R807 470 D803 SEL6910D

R216

3.3K

STB 41

C232 R112 1.5K C110 10/16 R106 390K 120(1/2W) 470/16 R108 15K R107 15K C113 R105 390K C109 10/16 R111 1.5K R119 1.5K C228 R214 2.2K R213 R115 47KB C246 153 2.2K C227 R212 R211 C230 1/50 C226 68K 68K C225 1/50 C229 C231 R215

10/16 10/16 10/16

BIASADJ[H] 37 BIASADJ[M] 36 BIASADJ[N] 35 GND 34 BIASCONT[R] 33 DACOUT[R]32 Q201 HA12169FB VCC2 VCC1 31 30

FADE R808 270 D804 SEL6910D ALBUM

65 RPI[R]PBIN 66 67 VRI2[R]ACCUIN 68 CONT[R] 69 VRI1[R]LINEIN 70 GND2 71 GND1 72 VRI1[L]LINEIN 73 CONT[L] 74 VRI2[L]ACCUIN 75 76 RPI[L]PBIN 77 13EQCONT[L] 1 BIA_TRAPL 8 RECOUT[L] 11LMOUT[L] 15EQOUT[L] 2 PBOUT[L] 10LMDET[L] 78 79 80 16N.NORM

X

R120

1.5K

R226

R113

3.9K

P101

R114

X

C112 3.9K

681 R102 100K R116 47KB

C106 822

C240 104

100K

C102

STANDBY R810 470 D806 SLV332VR DOLBY C

C105 822

P.B.LEVEL

12V C239 104

10/16 10/16 10/16 3.3K

DACOUT[L] 29 BIASCONT[L] 28 FM 27 FQ 26 F/Q 25 GH 24 GL 23 17N.HIGH GP 22 18N.MTL 21 19 20

D T C 1 1 4 T SC 1 1 1

183

DTC114TS 183

C108 100/16 R110 120

R811

470

D807

SLV332VR REV.MODE

C107 100/16

Q104 X P.B.LEVEL

R117

70/120

R812 R804 R803 470 R805 R225 100K 820 P705A R806

470

D808

SEL6910D DOLBY B

R109 120

470

D809

SEL6910D TAPE IN

70/120

Q103

C238 1/50

12EQIN[L]

9 LMIN[L]

5 CCRL

3 2 1

4 5 6

6 HLSL

3 SS1L

4 SS2L

7 LLSL

14IREF

2
9 8 7 6 5 Q101

R/P

70/120

R217 6.8K

R802 R260 68K NC R261 2.2M R250 R248 R249 39K 82K R262 390K NC R263 2.2M R252 390K NC R253 390K R242 100K

470 820

470

D810 D802

SEL6910D R.PLAY SEL6910D F.PLAY

R254 56K 1SS352 NC R255 2.2M R244 56K

R256 68K NC R257 2.2M R246 680K R258 82K

R259 33K

R801

D201

1/50

C215

10K

1/50

10/16

C203 6.8K R219 222

C205 222

R209

C114 MPC1330HA 10/16

C233

R201

22K 560

4.7/50

L203 NMC-6079

D801

SEL6910D

4

3

2

1

R205 6.8K C219

100K

GND4

R203

R279

R282 12K 1M DTC114TS NC R245 2.2M R235 47K NC 2.2M 12K R236 100K R247 68K 68K NC R2512.2M R241 82K STBY

S806 S801 R813 390 S807 R817 R818 R819 R.PLAY S809 R820 F.PLAY R821 STOP 1.8K 1K FF REW S810 820 390 470 EJECT

R269

1K

1.8K Q205 2SD655

C241

R271

C221

10/16

R118

R273

R814

R267 1K

R237 100K R238 33K R239 33K

S802 DOLBY NR

R234 R 2 2 31 2 K Q209 C213 104 C217 2.2/50 10/16

NC R240 2.2M

R243

NC 2.2M REV.MODE

S803

C207 222

104

104

R/P

R207 1K

470

S808

REC R

REC L

C209

C211

C223

R227 10K

C249 223

S804 AUTO SPACE S805

R276

C281

C406

C404 471

C412 121/100 L402 NCH-4183 4 3 2 6 1 C408 273 C410 101/100

273

C413 8.9 R402 100K 100/16 (1/2W) R409

C426 680 C424 681 L406 4.7MH

1/50

400/12K Q207

R275 1K

330K

REC/PAU S811

R816

1K

R815

820

R281

120

OSC

1K

R404 330K

C402 103

S812
DAC_L DAC_R

R822

3.9K

DTC114YS

C247 394

ALBUM
REC_R LEVEL_R

REC_MUTE

S813 RI

R274

OSC_OUT

CLK

FADE

LEVEL_L

3
9 8 47 (1/2W) 3 C414 47/16 4

P701

NADIS-7385
2 3 C918 R744 470 1

10

11

12

13

14

15

16

17

18

U3 Display circuit PC board

390K

Q401

MPC1297CA

REC_R

DO

STB

RESET

REC_L

7

6

5

4

3

2

1

NCH-4183

L401

L702 1MH

223 R722 D708 390K

R401 C407 C401 103 273 100K C422 10/16 R406 3.3K S717 FT-1 R408 R407 22K R405 3.3K 22K C711 223
REC_L DAC_R

NC

1MH

DAC_L

5V

L701

2

1 6

C709

104

UDZS5.6B D703 1SS352 R721 47K

R410

C403 471

C409 101/100

R403 C405 330K

REV.M 64

FADE60

A L B U M6 1

D O L _ C6 3

REC59

KEY3[NC] 55

KEY254

V A R E F5 7

VASS56

STBY62

KEY153

VDD58

F T5 2

C411 121/100

273

FT-2 R730 R729 R728 R723 2.7K 2.7K 2.7K 2.7K R724 390

P706A

P706

L405 C421 100/500 R413 10 (1/2W) C423 C425

4.7MH 681 680 R411 39K C415 220/6.3 12V

1 DOL_B

LM[R] 51 LM[L] 50

2 TAPE_IN 1 2 3 4 5 6 7 8 3 R.PLY1 4 R.PLY2 5 F.PLY1 6 F.PLY2 7 NC1 8 NC2 9 NC3 10 NC4 11 NC5 R735 R736 10K 3.3K 12 NC6 13 NC7 14 DOOR_LOCK_OPEN 15 P-OFF 16 R.REC 17 MTL_SW 18 F.REC R702 R703 R704 3.9K 3.9K 24 STB 3.9K 20CLK 23 CS 19 NC8 22 DO 21 DI 25 TEST[VSS] TMP87CH14F Q701 LED

5V

B I A S _ C O N T4 9 R/P 48 70/120 47 L I N E _ M U T E4 6 O S C _ O U T4 5 400/12K 44 D O L _ R S T4 3 REC_MUTE 2 4 TA7291S O P E N _ S W4 1 C L O S E _ S W4 0 RI_OUT 39 RI_IN 38 ROT.SEN.37 D O O R _ C L O S3 6 E 30 CASS_IN 31 HIGH_SW D O O R _ O P E N5 3 28 XOUT 29 RESET SOL 34 CAP 33 32 PLAY R746 3.9K R745 3.9K R707 1 100K LOAD OUT LOAD IN LOAD OUT SW GND LOAD IN SW TO MECHANISM 3 2 R751 7 6 100/16 Q707 5 4 8 R720 1.8K C705 9 UDZS7.5B D702 R750 100K

472

C416 472

R 4 1 43 9 K

Q405 2SC1213C 183 C418 223

2SA950

5

2

C417

R412 5.6K
70/120

6

C427

R416 4.7

4.7

L403 NLO-2059 123/100 C419 47/16 C420

1

Q403

R418 39K 4 3

BIAS ON/OFF
BIAS_CONT R/P

9 10 11

R415

P401

R417

Q404 2SC1213C

39K

Q402 DTC114YS

4

12 13

26 VSS

PING

MUT

12V1

12V2

NAAF-7383
R917 10K D910 5.6V R916 UDZS5.6B 560 Q901 78M12 1SS352 D909 1SS352 C916 10/16 I G O
+12VSIG

P903A

C917 104

R733

R732

R731

R734

U2 Power supply circuit PC board
P901A

NAPS-7384

P903

GND2

12V3

GND3

27 XIN

3.9K 2.7K 2.7K 2.7K 2.7K X701 CST8.00MG R706 3.9K R705 5.6 4 3 2 1 R727 3.9K 8 1SS352 R715 12K 5KB 3.9K SOL Q713

C710

223

Q708 DTA114YS

R718

E854

D T C 1 1 4 Y S3 . 9 K

5V

R717 Q706 2SB1068

47K 12V

P703

D908

C907

Q702 R725 330K C701 2.2/50 DTA114YS #1,#8 NC BR93LC46F-WE2 Q711 5 6 7

R716

P702

12V

TAPE SPEED ADJ.

R914

R915

470

470

T901 NPT-1434* AC-H
AC0

C901 104

1000/16

MTR SPEED A MTR SPEED B GND MTR PLAY SW 5V

AC1

AC1

2 F U S 2 A /A F U V E _ B E_ 250S

5 C903 6
AC2 AC2

P901

F901 F 9 0 1 AF 9 0 1 B

104

AC-G

D901 GP1N4003 D902 I GP1N4003 22V

223 R726

C702

DC1

5

Q903 78M12 G O

D701

R823

10K

12V 3.9K Q710 DTC114YS D706 C703 223 R737 10K 223 R708 C704 Q703 2SA933 10K 5V

ROT SEN SOL HIGH SW CASS IN SW F.REC SW MTL SW R713 Q712 12V CAP DTC114YS 3.9K 2SB1068 R.REC SW

TO MECHANISM

4

7

AC0

Q905 78M05 1000/16
DC1

C 9 0 41 0 4

P902

C915

4700/25

100/16

* NPT-1434D
NPT-1434G NPT-1434P

C909

I

G

O

C905

1SS352

Q704 R709 22K DTC114YS R712 1M

GND

Q705

R714

47K

K-501A SCHEMATIC DIAGRAM
MECHANISM SECTION Rec/Play/Erease Head
1. L +
L

2. L -

R/P HD
R

3. R 4. R +

E HD

5. E 6. E +

Control circuit PC board UNLOAD SW COM LOAD SW MTR-(CW)(UNLOAD) MTR+(CCW)(LOAD)
1 2 3 4 5
MTR

Main circuit PC board
R.REC SW METAL SW F.REC SW PACK SW HIGH SW + SOL SENSOR OUT +5V SENSOR PLAY SW + MTR - COM MTR SPEED A MTR SPEED B 1 2 3 4 5 6 7 8 9 10 11 12 13
MECHA CHASSIS
B A + -

SOL

MTR

K-501A
D

L405

E855 J109 L406 L405 P101 C233 C104 J110 J122 J117 J118 J123 12 12 J112 22 22 20 J126 20 J113 J116 C231

L406

C221

C232

E851

C217

C211 L R C215 L203 L203 C219

C209

C246

C207

C205

C203 C223

L403

L403

C

C420

E853 P401 C103 J104 Q404 7 J101 J108 C418 C113 C108 C114 R117 C107 C113 C417 C416 C409 C105 C106 C407 J119 J120 L401 L401 J102 C422 C112 J115 P.B.LRVEL J106 C421 R410 C109 R413 L402 J114 L402 C111 C110 Q401 Q401 C414 C247 Q102 C411 C419 C101 Q101 C102 C427 J105 Q405 7 C281 J124 C243 J125 7 J127 J128 J107 R115 J121 R116 Q403 J111

C238

C229 J140 P205 J139

C213 J142

J141

C227 J134

P204

25137383A
J132 L204 L204 1 C234 15 J133 C243 C237 J136 27 27

C226

C405 C403 C401

C230

C242

J147

C214

J145 C216 C236 J137 J154 J135 J131 J130 17 J129 C224 22 C218 25 C220 27 P706A 7 C235 C222 C208 C210 C212

J150

C204

J151

C206

C282

Q205

Q206

C228

J153

J152

B

J103

C402

C408 C412 C410 C413 C406 R409 C415

P903A

PRINTED CIRCUT BOARD VIEW 1

1

2

3

4

5

Component side from soldering side U1 Main circuit PC board NAAF-7383
C404

A

20

NCAF-7383

J1004

UPP

J1003

UGT

J1002

UDT

J1001

UJJ

P204 20

C225

J144 J146

20

J143

C241

17

7

K-501A
A B
R408 R406 R405 R407

C

D

PRINTED CIRCUIT BOARD VIEW 2
1

R404

R403

R401 R402

R502

U1
R412

R503 R411

Main circuit PC board NAAF-7383

R414

R417

R415

R416

Q402

R103 R501 R113

Q103

R111

R105

2
Q104

R120 R114 R106 R110 R102

R112 R108

R107

R119

R109 R101

R418 C423 C425 C426 R104 C424 R234 R244 R254 R505 R506 R235 R245 R255 R236 R246 R256 R507 R225

R118 R508 R509 R237 R247 R257 R238 R248 R258 R510 R511 R239 R249 R259 R512 R513 R240 R250 R260 R241 R251 R261

R504 D202 C250 R228 R227 D201 R276 R275 R281 C249 R224

3

Soldering side
R265

R229 C239 C240 R266 R516 R517 R274 R518 R519 R230 R231 R232 R233 R264 R226

R223

R279

R273

Q207

R514 R515 R242 R252 R262 R243 R253 R263

R282

40

21

R271

R207

41

Q201

20

R209 R520

60

Q201

1

R205

4
R210 R208 R272 R217

R206

R280

61

R218 R211 R216

Q210

80

R222

R212

R215

R202 R204 R214 R213

C283

Q203

R220

R270

C248

R201 R203

D203

5

Q204

R283 R221 R284 R285 R278

R268 R267

R269

R219

Q209

L R

K-501A
A B
U2

C

D

PRINTED CIRCUIT BOARD VIEW 3
1

Power supply PC board NAPS-7384

P902 P902 T901 E852 C901 F901A R902

AC-H

T2AL250V

R901 J903 AC-G F901 F901B AC-G 15

J901

C903 D901 J902 D902 C905

C904

C905

AC-H

T901 J904

2

17 R716

J926 Q706 C907 C907 Q707 Q901

ROT_S J919 7 J925 J920 X701

3

J934 P903 E854 7

J931 J932

2

J935 J933

4

EJECT 7

S806 J705

D810

20

20

S807

J701

J702

U3

Display circuit PC board NADIS-7385 Component side from soldering side

D808

FF REW S808
2

2

D803

D804

J704

D805
2 2 2

5

S809 F_PLAY S810 R_PLAY S811 STOP
2 2

D801

S804 A_SPACE
2 2 2

S803 REV_MODE

S802 DOLBY

D809

D807

D802

S805 REC J703

S812 FADE

S813 ALBUM

NCDIS-7385 25137385 0

2

D806

7

P901 J906 GND Q903 GND 7

C909 C909 J938 C914 C915 J913

7 J905 7

C916

C701

J909 7 J907 J908 5V

R909

Q705

Q905

J937 SPEED

P702 J911 J912

P705

P701 P701 J936

J914 C705

NCPS-7384

25137384

J915 J916 J917

1

J921

J923

J922

J924

J918 FT

J927

20

20 CLK

20

20

P703 S717

20

DO DI

STB J929 J930

CS

J928

P706

2

Component side from soldering side

P705A
2

S801 STBY

K-501A
A B C D

PRINTED CIRCUIT BOARD VIEW 4
U2 Power supply PC board NAPS-7384 Soldering side

1

2
R915 C703 C702 C917 R917 D910 R726 D706 D909 D908 R916 R729 R914

R706

Q710
R704

R714

R713

Q712

Q711
R725 R801 R802 R803 R735 R804

R736

R715 C918

R708 C704

R703 R702

R751

R718

Q703

D701

R709

R705

Q701
R712

R717

19

1 64 Q701
R728 R730 R724 R723

Q713

Q704

R744

R737 R707 C709

3

20

R722

D708

R573

52 33 51
R746 R745

R750

R720

R572

R571

D703 R721

D702

8

Q708

Q702
C710 R732

L702
L701 R817

1
R727

R734 R733

4
R806

U3

Display circuit PC board

NADIS-7385

Soldering side

R805 R812 R811 R818 R808 R819 R809 R810

5
R820 R821

R807 R816 R815 R814

R823

R813

R822

R731

C711

K-501A PARTS LIST
CIRCUIT PARTS 1

REF. NO. Q101 Q102 Q201 Q401 Q701 Q702 Q707 Q901,Q903 Q905 Q103,Q104 Q203,Q204 Q708,Q711 Q205,Q206 Q207,Q402 Q704,Q710 Q712,Q713 Q209,Q210 Q403 Q404,Q405 Q703 Q705,Q706

PART NO. ICs 22240147 222905 22241144R3HI 222959 22241751R3 22241609R2 22240239 222780125NEC or 222780125JRC 222780055 Transistors 2216680R2 2216360R2 2216480R2 2211705 or 2211706 2216260R2 2216470R2 2216670R2 2211504 2201883 2214640R2 2212853 or 2212855 Diodes 22380035 or 22380260 223234R2 or 223269R2 223234R2 or 223269R2 223234R2 or 223269R2 223234R2 or 223269R2 224550470R2 224550750R2 224550560R2 LEDs 225390 225322 225324D 225404 225390

DESCRIPTION
MPC1330HA MPC1228HA HA12169FB MPC1297CA TMP87CH14F-3JJ5 BR93LC46F-WE2 TA7291S MPC78M12HF NJM78M12FA 78M05HF

RN1411 RN2407 DTA114YKA 2SD655-E 2SD655-F RN1407 DTC114YKA

DTC114TKA 2SA950-Y 2SC1213-C 2SA1037K 2SB1068-K 2SB1068-U

D901,D902 D201,D202 D701,D703 D706,D908 D909 D203 D702 D708,D910 D801,D802 D803 D804,D805 D806 D807-D810

GP104003E RL1N4003 1SS352 1SS355 1SS352 1SS355 1SS352 1SS355 1SS352 1SS355 UDZS4.7B UDZS7.5B UDZS5.6B

SEL2910A-TP6 SEL6210S SEL6910A-D SEL2210R TP6 SEL2910A-TP6
Note ...Europian model only
...120V model only ...220-230V model only THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.

K-501A PARTS LIST
CIRCUIT PARTS 2

REF. NO. L401,L402 L405,L406 L203,L204 L403 L701 X701 C243,C907 C909 C107,C108 C413,C705 C915 C109,C110 C221-C226 C229-C232 C241,C242 C422,C916 C114 C113 C414,C419 C215,C216 C219,C220 C227,C228 C238,C281 C217,C218 C701 C233-C237 C415 C101,C102 C105,C106 C111,C112 C203-C208 C209-C214 C247 C901,C903 C904 C409,C410 C411,C412 C420 C103,C104 C905

PART NO. Coils 231127 231085 233407 231215 230955R2 Oscillator 3010341 Capacitors 354741029 354741019

DESCRIPTION
NCH-4183 NCH-2133 NMC-6079 NLO-2059 BK1608HS102-T

CSTLS8M00G56

1000uF,16V,Elect

100uF,16V,Elect

354741009

10uF,16V,Elect

354744719 354744709 354780109

470uF,16V,Elect 47uF,16V,Elect 1uF,50V,Elect

354780229 354780479 354722219 374726814 374728224 374721834 374722224 374721044 374723944 374721044 370131014 370131214 370131234 391980227 391963327

2.2uF,50V,Elect

4.7uF,50V,Elect 220uF,6.3V,Elect ECQ-B50V-681J ECQ-B50V-822J ECQ-B50V-183J ECQ-B50V-222J ECQ-V50V-104J ECQ-V50V-394J ECQ-V50V-104J

APS100V-101J APS100V-121J APS100V-123J 2.2uF,50V,Elect 3300uF,35V,Elect
Note ...Europian model only
...120V model only ...220-230V model only THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.

K-501A PARTS LIST
CIRCUIT PARTS 3

REF. NO. R117,R409 R410 R413 R115,R116 R716 S717 S801-S813 Q901A

PART NO. 443521214 443524704 443521004 5210296 5210261 Switches 25035699 Heat sink 27160391

DESCRIPTION
120ohm +/-5% 1/2W,Metal oxide 47ohm +/-5% 1/2W,Metal oxide 10ohm +/-5% 1/2W,Metal oxide N06HR47KBE,Trimming N06HR5KBC,Trimming

NPS-111-S662

HEAT SINK

Fuse holders F901A,F901B 25052133 Jacks P204 25045305 P701 25045330 Plugs P101 25055136 P205 25055689 P401 25055132 P702 25055157 P703 25055149 P705 25055158 P706 25055709 P901 25055675 P903 25055704 Sockets P706A 25051238 P902 25051990 25051637 25051637 P903A 25051233 P705A 2002E392825 Holder E852 27190608-1 Retainer E854 27141059 Clamp E851 260224 Screws Q901A,Q903B 82143010

NSCT-1P2031

NPJ-4PDBL164 NPJ-2PDBL184

NPLG-6P120 NPLG-2P645 NPLG-2P116 NPLG-13P141 NPLG-5P133 NPLG-14P142 NPLG-13P665 NPLG-2P631 NPLG-8P660

NSCT-13P1028 NSCT-2P1777
NSCT-2P1424 NSCT-2P1424 NSCT-8P1023 NSAS-28P1000

(CRAMP) UA-0 V0

CP-1S

3P+10FN(BC),Pan head screw
Note ...Europian model only
...120V model only ...220-230V model only THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.

K-501A IC BLOCK DIAGRAM 1
EQ CONT(L) REC OUT (L) HLS DET (L) LLS DET (L) EQ OUT(L) LM OUT(L) LM DET(L)

Q201:Dolby IC (HA12169FB)
LM IN(L) PB OUT (L) CCR(L) SS1(L) SS2(L) TP

EQ IN(L)

NR ON/OFF

D-GND

RESET 42

MPX

60 V REF (L) NRIN(L) IAOUT(L) BIAS RPI(L) VR3(L) VR2(L) CONT(L) VR1(L) 61 62 63 64 65 66 67 68 69 70 GND 71 VR1(R) CONT(R) VR2(R) VR3(R) RP1(R) REF(R) IAOUT(R) NRIN(R) VREF(R) 72 73 74 75 76 77 78 79 80 1 TP(R)

59

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

43

41 40 DATA

RECT Dolby B/C NR DA LMA

EQ VOL

STB

C/B

39 CLK SW REQ LL Logic 38 IN J

37 BIAS ADJ(C) 36 BIAS ADJ(M)

DAC E.VOL

35 BIAS ADJ(N) 34 GND 33 BIAS CONT(L) 6BIT DAC 32 DAC OUT(L) 31 30 VCC

6BIT DAC

6BIT DAC

6BIT DAC

29

DAC OUT(R)

28 BIAS CONT(R) 27 FM 26 fQ 25 f/Q 24 GH 23 GL RECT EQ VOL 22 GP 21 HM EQ-Controller

E.VOL DAC LMA DA Dolby B/C NR REQ

2 PB OUT

3 SS1(R)

4 SS2(R)

5 CCR(R)

6 HLS DET(R)

7 LLS DET (R)

8 REC OUT (R)

9 LM IN(R)

10 LM DET(R)

11 LM OUT (R)

12 EQ IN (R)

13 EQ CONT(R)

14 IREF

15 EQ OUT(R)

16 NN

17 NC

18 NM

19 HN

20 HC

Q101:Recording amplifier IC(MPC1297CA)
VCC 18 VR2 17 VIN(R)2 16 PH2 15 CIN2 14 COUT2 VOUT21 VOUT22 13 12 11 VIN 10

SIGNAL INPUT

PEAK HOLD COMPARATER

VCA OUT

POWER SUPPLY

PROTE CTION COMPARATER SIGNAL INPUT PEAK HOLD VCA OUT

PRE DRIVER

1 VS1

2 VR1

3 VIN(R)1

4 PH1

5

6

7

8

9 GND

CIN1 COUT1 VOUT11 VOUT12

K-501A IC BLOCK DIAGRAM 2

Q707 : TA7291S(Motor drive) Vcc 2 8 Vref 6 VS

REG

PROTECT

9 IN 1 IN 2

1 GND

5

7 M

3

OUT 1

OUT 2

OPERATION STOP FORWARD REVERSE BRAKE

INPUT IN 1 IN 2 0 0 1 0 0 1 1 1

OUTPUT OUT 1 OUT 2 H L L L H L

K-501A

MICROPROCESSOR CONNECTION DIAGRAM
Q701:TMP87CH14F
AUTO SPACE REV. MODE DOLBY NR STANDBY REC/PAU R.PLAY F.PLAY ALBUM

10K

3.9K

1.8K

1K

820

470

390

EJECT

STOP

FADE

REW

FF

1K

820

470

390

Q201
FT 1 FT 2 11.5V

L402 L401 Q101
+5V

Q102

Q401 Q203.Q204 Q205.Q206

G10 G11 G12 G13 G14 G15 VDD VAREF VASS

NC

K2 K1 FT

64 63 62 61 60 59 58 57 56 55 54 53 52

+5V

Q601 TRAY MOTOR DRIVER Q702 Q711 POWER FAILURE DET. BR93LC46F-WE2

20 21 22 23 24 25 26 27 28 29 30 31 32

CLK DI DO CS STB TEST VSS XIN XOUT RESET CASS IN HIGH SW PLAY

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

DOL B TAPE IN R.PLY1 R.PLY2 F.PLY1 F.PLY2 N1 NC (+5V) N2 NC (+5V) N3 NC (+5V) N4 NC (+5V) N5 NC (+5V) N6 NC (+5V) N70 NC(GND) DOOR LOCK OPEN P-OFF R.REC MTL SW F.REC NCB

LM(R) LM(L) BIAS CONT R/P 70/120 LINEMUTE OSCOUT 400Hz/12kHz DOLBYRESET RECMUTE OPENSW CLOSESW RIOUT RIIN ROI.SEN DOOR CLOSE DOOR OPEN SOL CAP

51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

TRAY OPEN DET SWITCH

TRAY CLOSE DET SWITCH
SYSTEM BUS

220K

ROT SENSOR
5V 47K 5V

X701 8MHz

PLAY SW MECHA
11.5V 11.5V

Q707 TA7291S MOTOR DRIVE

R-REC SW MECHA

METAL POSITION SW MECHA

F-REC SW MECHA

Q201 HA12169FB DOLBY DECODER

Q710 SYSTEM RESET

CASSETTE IN SW MECHA

HIGH POSITION SW MECHA

CAPSTANMOTOR MECHA

SOLENOID MECHA

K-501A

K-501A MICROPROCESSOR TERMINAL DESCRIPTIONS
Pin NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Terminal DOLBYBLED TAPEINLED REVLED1 REVLED2 FWDLED1 FWDLED2 NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED MODEL MODE DCHECK POFF PRECINHSW METALSW FRECINHSW VKK CLOCK SIN SOUT CS STB TEST VSS XIN XOUT RESET PACKSW HIGHSW PLAYSW CAPSTAN SOLENOID OPEN CLOSE RSENSOR RIIN RIOUT CLOSESW OPENSW RECMUTE DOLBYRESET 400Hz/12kHz OSCOUT LINEMUTE 70/120 REC/PB BIAS LEVELLCH LEVELRCH KEYIN4 KEYIN3 KEYIN2 KEYIN1 VASS VAREF VDD RECLED FADELED ALBUMLED STBYLED DOLBYCLED REVERSELED I/O O O O O O O DESCRIPTION Dolby B indicator control output pin Cassette tape detection indaictor control output pin Reverse direction indicator control output pin Reverse direction indicator control output pin Forward direction indicator control output pin Forward direction indicator control output pin Not used. Not used. Not used. Not used. Not used. Not used. Model judgement input pin Load detection input pin when a door closes. Power failure detection input pin Prohibition against reversal recording input pin Metal switch detection input pin Prohibition against foward recording input pin Not used. Control for EEPROM Data input for EEPROM Data output for EEPROM Chip select for EEPROM Standby port Connect to GND Connect to GND Clock OSC(8MHz) Clock OSC(8MHz) System reset Cassette detect switch High switch detect Play switch detect Capstan control Solenoid control Door control Door control Rotate sensor System code input pin System code output pin Door close detect Door open detect Recording mute control Dolby IC reset Switched 400Hz/12kHz OSC output 400Hz/12kHz Line mute control Tepe select port Mode select port Bias select A/D Control for input level(Lch) A/D Control for input level(Rch) A/D Control A/D Control A/D Control A/D Control Ref. Voltage for A/D compareter +5V Ref. Voltage for A/D compareter GND +5V REC indicator control output pin FADE indicator control output pin ALBUM indicator control output pin STANBY/ON indicator control output pin Dolby C indicator control output pin Reverse mode LED indicator control output pin

I I I I I I I I I O O

I I I I O O O O I I O I I O O O O O O O O I I I I I I

O O O O O O

K-501A ADJUSTMENT PROCEDURES
PRECAUTIONS 1. Before adjustment, clean the following parts with an alcohol moistened swab. *recording/playback head *pinch roller *capstan *erase head TEST EQUIPMENT/TOOL REQUIRED Audio Oscillator Digital frequency counter Oscilloscope Attenuator AC voltmeter Non-magnetic screwdriver Test tapes TCC-153 MTT-111N MTT-150 :10kHz, -10dB :3kHz,-10dB :Dolby level calibration 400Hz, tone 200nWb/m

2. Do not use magnetized screwdriver for adjustment. 3. Demagnetize recording/playback head with a head demagnetizer.

Item

Connection of instrument Frequency

Line output level/freq.

Test tape

Mode

Output indicator

Adjustme nt point

Adjustment

Remarks

1

Tape speed

counter to P205 or LINE OUT terminal. AC voltmeter

MTT111N

PB

Frequency counter

R716

3010Hz

Maximum level TCC-153 PB AC voltmeter Fig.1 & same phase at channels L &R R115 Refer to Fig.2.

2

Head azimuth

& oscilloscope to P205

3

Playback level

AC voltmeter to P205

MTT150

PB

AC voltmeter

(L ch.) R116 (R ch.)

300mV

Frequency 4 Bias frequency counter to lead wire of erase head Auto Rec, level adjustment Normal tape REC Frequency counter L403 85kHz

5

Normal tape

REC/PB

Auto(S717)

Push a auto-adjust button(S717)

Blank tapes Normal High Metal UDUDC-90 C-90 PLAY torque ............... 30 FF/REW torque ............80 Back tension ............... 2 70g/cm (Use the test tape TW-2231.) 180g/cm (Use the test tape TW-2111.) 6g/cm (Use the test tape TW-2111.)

XS C-60

K-501A ADJUSTMENT POINT

R L L403 P205

NCAF-7383 25137383A
1

P.B.LEVEL

R116

R115

R716 SPEED

NCPS-7384 25137384 1 S717

PHASE CHART
0 deg. 45 deg.
AF OSC

AF Attenuator

VTVM

K-501A
LINE IN LINE OUT

OSC

90 deg.

180 deg.
VER HOR

VTVM

L

K-501A

R LINE OUT

K-501A PACKING VIEW

C10

C8

C9

C3 Up C7 C5 Accessories Front

C1

C4 Front

C2

K-501A PARTS LIST
PACKING VIEW

REF. NO. C1 C2 C3 C4 C5 C7 C8 C9 C10

PART NO. 29092028A 29053865 29092029 29363044 29095835 29100097-1A 2010376 2010375 29343267 29343268 29343269 29343270

DESCRIPTION
Pad Carton Pad (S) EAN Label 0.515x650x550,Sheet 350x250,Polybag Cord ass'y 3.5-MINI PLUG,Cord ass'y Instruction manual E Instruction manual CT Instruction manual U3GSWD Instruction manual U3FSI

K-501A

ONKYO CORPORATION Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN Tel: 072-831-8111 Fax: 072-833-5222 ONKYO EUROPE ELECTRONICS GmbH Industriestrasse 20, 82110 Germering, GERMANY Tel: 089-849-320 Fax: 089-849-3265 E-mail: [email protected] ONKYO CHINA LIMITED Units 2102-2107, Metroplaza Tower I, 223 Hing Fong Road, Kwai Chung, N.T., HONG KONG Tel: 852-2429-3118 Fax: 852-2428-9039

HOMEPAGE http://www.onkyo.co.jp/