Onkyo K-501A User manual

K-501A
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LISTARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERSAPPEARAS 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.
SERVICE MANUAL
SERVICE MANUAL
CASSETTETAPE DECK
MODEL K-501A
230-240V AC, 50Hz
120V AC, 60Hz
220-230V AC, 50/60Hz
UPP
UDT
UGT
Ref. No. 3718
112001

K-501A
SPECIFICATIONS
Track format
4-tracks, 2-channels
Erasing system
AC erase
Tape speed
4.8 cm/sec.
Wow and flutter
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
Signal to noise ratio
• 54 dB (metal position tape, Dolby NR
off)
• Noise reduction of 10 dB above 5 kHz
and 5 dB at 1 kHz is possible with Dolby
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
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 H 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)
Weight
2.5 kg, 5.5 lbs
Specifications and external appearance are
subject to change without notice as a result of
product improvement.
xx
CIRCUIT NO. PART NO. DESCRIPTION
F901 252074 2A-SE-EAK,Fuse <PP,GT>
SERVICE PROCEDURES
<PP>...Europian model only
<DT>...120V model only
<GT>...220-230V model only

K-501A
PANEL VIEW
FRONT PANEL
STANDBY / ON
STANDBY
FADEREV MODEDOLBY NR
BC
ALBUM
CD DUBBING
K
-
501 A
STEREO CASSETTE TAPE DECK
CASSETTE LOADING MECHANISM
STANDBY/ON button
STANDBY indicator
ALBUM button/ALBUM indicator
REV MODE button
FADE button/FADE indicator
/ Rec/Pause button
,
,
Rec/Pause indicator
Cassette in indicator
Eject button
Fast-forward/Rewind Skip button
Forward/reverse side play button
Stop button
Cassette slot
Auto space button
REV MODE indicator
DOLBY NR indicator
DOLBY NR button

EXPLODEDVIEW
K-501A
S1 A1
A2 A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
U1
U2
U3
Z1
A2
A17
T901
P901A
P101A
P702AP702A
P703A
S1
S1
S1
S1
S1
S3
S4
S2
F901

K-501A
PARTS LIST
EXPLODEDVIEW
REF. NO. PART NO. DESCRIPTION
A1 27111266 Front bracket
A2 27191165 Holder (Door)
A3 28198948 Facet(IN)
A4 28148505 Door
A5 27180583 Spring
A6 28325983 Recording button ass'y
A7 27100415 Chassis
A8 27191164 Holder (Mechanism)
A9 27300750 #2271,Bushing
A10 27212366 Front panel
A11 28198939 Facet(S)
A12 28198946 Facet(PLAY)
A13 28198947 Facet(NR)
A14 28184832 Cover
A15 28140079 Cushion
A16 28141492 Cushion
A17 28141489 Cushion
A18 27122947A Rear panel <DT>
27122948A Rear panel <GT>
27122949A Rear panel <PP>
A19 260208 Binder
F901 252074 2A-SE-EAK,Fuse <PP,GT>
P101A 2009990714 NSAS-14P0999,Socket ass'y
P702A 20022392618 NSAS-26P0998,Socket ass'y
P703A 20022391010 NSAS-10P0997,Socket ass'y
P901A 253334HRK AS-CEE,Power supply cord <PP,GT>
253331HDK or AS-UC-2,Power supply cord <DT>
253330MIL AS-UC-2,Power supply cord <DT>
T901 2301571 NPT-1434D,Power Transformer <DT>
2301572 NPT-1434G,Power Transformer <GT>
2301573 NPT-1434P,Power Transformer <PP>
U1 1N283583-1B NAAF-7383-1B,Main circuit PC board <DT>
1N283583-1C NAAF-7383-1C,Main circuit PC board <GT>
1N283583-1D NAAF-7383-1D,Main circuit PC board <PP>
U2 1N283584-1B NAPS-7384-1B,Power supply PC board <DT>
1N283584-1C NAPS-7384-1C,Power supply PC board <GT>
1N283584-1D NAPS-7384-1D,Power supply PC board <PP>
U3 1N283585-1B NADIS-7385-1B,Display circuit PC board <DT>
1N283585-1C NADIS-7385-1C,Display circuit PC board <GT>
1N283585-1D NADIS-7385-1D,Display circuit PC board <PP>
Z1 244248A CMAL2Z815A,Cassette Mechanism
S1 838130088 3TTB+8B,Self tapping screw
S2 830440089 4TTC+8C(BC),Self tapping screw
S3 838930088 3TTB+8B(UN),Self tapping screw
S4 838430088 3TTB+8B(BC),Self tapping screw
Note
<PP>...Europian model only
<DT>...120V model only
<GT>...220-230V model only
THE COMPONENTS IDENTIFIED BY MARK ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE ONLY WITH PART NUMBER SPECIFIED.

C
F REC PACK
R REC
METAL
REF.NO PART NO. DESCRIPTION
1 FF18W- F/R belt
2 FF19Y- Main belt
3 F567-626 Switch PC board ass'y
4 FF26K- Flywheel ass'y
5 F513-891 Recording/Play head ass'y
6 F514-129 Pinch roller R
7 F514-130 Pinch roller L
8 F522-064 Clutch
9 F522-052 Clutch
10 FD52Y- Master cam
PARTS LIST
K-501A
EXPLODEDVIEW
CASETTE MECHANISM

X
X
D801-D810
KEY CONTROL&DISPLAY
Q704
Q703
Q713
Q712
Q706
Q705
START KEY
ADJUSTMENT
AUTO
S717
ERASE HEAD
R/P HEAD
MECHA and DRIVER
R716
TAPE SPEED
Q101
LINE
OUT
IN
Q701
MICROPROCESSOR
L401,L402,L403
Q401 Q405
BIAS OSC and HX PRO
D905,D906
D901,D902
T901
and REGULATOR
POWER TRANSFORMER
Q906
-22V(for FL tube)
70/120
Q103,Q104
R115,R116
P.B.LEVEL DOLBY NR,REC EQ,METER AMP
Q201Q102
P.B.AMP.
Q905Q903
Q901 5V(for MICROPROCESSOR)
12V(for MECHA)
12V(for SIGNAL)
K-501A
BLOCK DIAGRAM
K-501A

A
1
2
3
4
5
BCD
K-501A
SCHEMATIC DIAGRAM 1
U1 Main circuit PC board
U2
Power supply circuit
PC board
F901B FUSE_B
F901A
FUSE_A
12V
12V
E854
22V
12V
5.6V
P903
P903A
C102
681
C101 681
Q201
HA12169FB
61
62
63
64
66
75
77
78
79
80
BIA_TRAPL1BIA_TRAPR60
CCRL5CCRR 56
CONT[L]73
CONT[R]68
DGND47
EQCONT[L]13 EQCONT[R]48 EQIN[L]12 EQIN[R] 49 EQOUT[L]15 EQOUT[R]46
GND171 GND270
HLSL6HLSR 55 IREF14 LLSL7LLSR 54 LMDET[L]10 LMDET[R]51
LMIN[L]9LMIN[R] 52 LMOUT[L]11 LMOUT[R]50
NNORM16 NR ON/OFF45
PBOUT[L]2PBOUT[R]59 RECOUT[L]8RECOUT[R]53
RPI[L]PBIN76
RPI[R]PBIN65
SS1L3SS1R 58 SS2L4SS2R 57
VRI1[L]LINEIN72
VRI1[R]LINEIN69
VRI2[L]ACCUIN74
VRI2[R]ACCUIN
67
T901
NPT-1434*
2
4
5
6
7
P901A
X
X
X
P204
54
L204
NMC-6079
123 6
54
L203
NMC-6079
123 6
L401
NCH-4183
123
46
L402
NCH-4183
123
46
L403
NLO-2059
123
45
6
Q905
78M05
G
IO
Q903
78M12
G
IO
Q901
78M12
G
IO
P706A
P706
P902
P901 P401
P
Q101 MPC1330HA
1 2 3 4 5 6 7 8 9
P
P101
Q204
DTA114YS
Q203
DTA114YS
Q711
DTA114YS
D203
UDZS4.7B
D910
UDZS5.6B
D902
GP1N4003
D901
GP1N4003
D908
1SS352
D909
1SS352
D706
1SS352
Q403
2SA950
Q205
2SD655
Q206
2SD655
Q404
2SC1213C
Q405
2SC1213C
R410 47
Q710
DTC114YS
Q207
DTC114YS
Q402
DTC114YS
C283 223
NC
C282 223
C246
153
C248
104
C904104
C903
104 C917
104
C901
104
C702
223
C703
223
C214
104
C213
104
C212 104
C210 104 C208 222
C206
222
C204
222
C205
222
C203
222
C211 104
C209 104
C207 222
C105
822
C106
822
C427 183
C424
681
C426
680
C425 680
C423 681
C111
183
C112
183
C411
121/100
C416 472
C417 472
C420
123/100
C418
223
C404
471
C402 103
C406
273
C412
121/100
C410
101/100
C408
273
C409
101/100
C407
273
C405
273
C403 471
C401 103
C247
394
C421
100/500
L406
4.7MH
L405 4.7MH
Q401 MPC1297CA
1 2 3 4 5 6 7 8 910
11 12 13 14 15 16 17
18
R116
47KB
R115
47KB
Q103
DTC114TS
Q104
DTC114TS
Q102MPC1228HA
1 2 3 4 5 6 7 8
R202 22K
R267
1K
R269 6.8K
R219
1.8K
R285 4.7K
R284 4.7K
R283 4.7K
R221 4.7K
R118 1K
R117 120(1/2W)
R917 10K
R916
560
R914
470
R915
470
R726
3.9K
R281
1K
R274 390K
R223
12K
R273
12K
R279
12K
R209 10K
R271 100K
R210
10K R272 100K
R208
1K
R206
6.8K
R207
1K R205 6.8K
R204 560R203 560
R201 22K
R268 1K
R211 68K
R212 68K
R216 3.3K
R218
6.8K
R215 3.3K
R217
6.8K
R213
2.2K
R214
2.2K
R222
18K
R220
1.8K
R270 6.8K
R278
10K
R725
330K
R110
120 R109
120
R119 1.5K
R120
1.5K
R102
100K
R104
470
R108
15K
R107
15K
R105
390K
R106
390K
R111
1.5K
R112
1.5K
R103
470
R409
120
(1/2W)
R406
3.3K
R413
10
R113 3.9K
R114
3.9K
R41439K
R415
39K
R418
39K
R101100K
R275
1K
R276
330K
R412
5.6K
R411 39K
R417 4.7
R416 4.7
R405
3.3K
R407
22K
R408
22K
R403
330K
R401
100K
R402
100K
R404
330K
C114
10/16
C113
470/16
C915
100/16
C909
1000/16
C907
1000/16
C905
4700/25
C916
10/16
C281 1/50
C233
4.7/50
C223 10/16 C221 10/16
C219 1/50
C235 4.7/50
C224 10/16
C222
10/16
C220 1/50
C218 2.2/50
C216
1/50
C217
2.2/50
C215
1/50
C241
10/16
C242 10/16
C230 10/16
C229 10/16
C225 10/16
C226 10/16
C231 10/16
C232 10/16
C227 1/50
C228 1/50
C238 1/50
C243 1000/16
C701
2.2/50
C104
2.2/50
C107
100/16
C108
100/16
C109
10/16
C110
10/16
C103
2.2/50
C415
220/6.3
C419
47/16
C414
47/16
C422
10/16
C413
100/16
OSC
DAC_L
DAC_R
LEVEL_R
REC_R
STB
REC_MUTE
CLK
OSC_OUT
DO
LEVEL_L
REC_R
REC_L
RESET
REC_L
DAC_R
DAC_L
70/120
BIAS_CONT R/P
GND3
PING
MUT
12V1 12V2 12V3
GND2
+12VSIG
AC1 AC1
AC0
AC2 AC2
DC1
AC0
DC1
GND
AC-G
AC-H
2
70/120
R/P
13
12
11
10
9
8
7
6
5
4
3
1
LINE MUTE
5.6
R/P
P.B.LEVEL
INPUT(R)
INPUT(L)
OUTPUT(R)
OUTPUT(L)
R ch L ch
8.9
400/12K
70/120
P.B.LEVEL
REC L REC R
70/120
BIAS ON/OFF
(1/2W)
(1/2W)
FUSE A FUSE B
F901
2A/250V
*
NPT-1434D<DT>
NPT-1434G<GT>
NPT-1434P<PP>
NAPS-7384
NAAF-7383
NC: No used

A
1
2
3
4
5
BCD
K-501A
SCHEMATIC DIAGRAM 2
U2
Power
supply
circuit
PC board
U1 Main circuit PC board
U3 Display circuit
PC board
BYMARK ARECRITICAL FOR SAFETY
IDENTIFIED
NOTE
THECOMPONENTS
REPLACEONLYWITH PARTNUMBERSPECIFIED.
.
.VOLTAGE(MEASUREDWITHVOLTMETER) IS DC VOLTAGE.(NO INPUT SIGNAL)
.ALL PNP TRANSISTORS ARE EQUIVALENT
.ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
.ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
.ELECTROLYTIC CAPACITORS ( )ARE IN F/WV.
.ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030-3pF 330-33pF 331-330pF 333-0.033uF
u
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 FORIMPROVEMENT.
.
.
TO 2SA1015-GR UNLESS OTHERWISE NOTED.
NC:Noused
TO MECHANISM
TO MECHANISM
NADIS-7385
5V
12V
5V
5V
12V
12V
5V
P705A
P705
Q201
H
A12169FB
19 20
21
BIASADJ[H] 37
BIASADJ[M] 36
BIASADJ[N] 35
BIASCONT[L] 28
BIASCONT[R]33
C/B 44
CLK 39
DACOUT[L]29
DACOUT[R]32
DATA40
DGND47
EQCONT[L]13 EQCONT[R]48
EQIN[L]12 EQIN[R] 49 EQOUT[L]15 EQOUT[R]46
F/Q 25
FM 27
FQ 26
GH 24
GL 23
GND 34
GP 22
INJ 38
IREF14 LMDET[L]10 LMDET[R]51
LMIN[L]9LMIN[R] 52 LMOUT[L]11 LMOUT[R]50
MPX43
N.HIGH17 N.MTL18 N.NORM16 NR_ON/OFF45
RST42 STB41
VCC1 30
VCC2 31
LED
Q701
TMP87CH14F
400/12K 44
70/120 47
ALBUM61
BIAS_CONT49
CAP 33
CASS_IN30
CLK20
CLOSE_SW40
CS23
DI21 DO22
DOL_B1
DOL_C63
DOL_RST43
DOOR_CLOSE36
DOOR_LOCK_OPEN14
DOOR_OPEN35
F.PLY15F.PLY26
F.REC18
FADE60
FT52
HIGH_SW31 KEY153
KEY254
KEY3[NC]55
LINE_MUTE46
LM[L] 50
LM[R] 51
MTL_SW17
NC17NC28NC39NC410 NC511 NC612 NC713
NC819
OPEN_SW41
OSC_OUT45
P-OFF15
PLAY
32
R.PLY13R.PLY24
R.REC16
R/P 48
REC59
REC_MUTE42
RESET29
REV.M
64
RI_IN 38
RI_OUT39
ROT.SEN.37
SOL 34
STB24
STBY62
TAPE_IN2
TEST[VSS]25
VAREF57
VASS56
VDD58VSS26
XIN27
XOUT
28
P706A
P706
P702
1
P701
2
3
Q702
BR93LC46F-WE2
12
34
5678
X701
CST8.00MG
D803 SEL6910D
D805 SEL6910D
D806 SLV332VR
D807 SLV332VR
D808 SEL6910D
D809 SEL6910D
D810 SEL6910D
D804 SEL6910D
D801 SEL6910D
D802 SEL6910D
S717
S810
S813
S812
S811
S809
S808
S807
S806
S805
S804
S803
S802
S801
P205
Q707 TA7291S
1
2
3
4
5
6
7
8
9
Q708
DTA114YS
Y
S
D702
UDZS7.5B
D708
UDZS5.6B
P703
D201
1SS352
D701
1SS352
D703
1SS352
D202 1SS352
Q706
2SB1068
Q705
2SB1068
Q703
2SA933
R801 820
R802 470
R803 820
R804 470
R807 470
R808 270
R809 270
R810 470
R811 470
R812 470
R805 470
R806 470
Q713
DTC114YS
Q712
DTC114YS
Q704
DTC114YS
C711
223
C710
223
C239
104
C249
223
C250
223
0
3
3
C918
223
C240
104
C709 104
C704
223
L702
1MH
NC
L701
1MH
R716
5KB
Q209
DTC114TS
Q210
DTC114TS
R255 2.2M
NC
R254 56K
R257 2.2M
NC
R256 68K
R258
82K
R259
33K
R261 2.2M
NC
R260 68K
R263 2.2M
NC
R262 390K
R245 2.2M
NC
R234
2.2MNC
R235 47K
R244 56K
R225
100K
R246 680K
R247 68K
R237 100K
R236 100K
R248
68K
R238
33K
R249
39K
R239
33K
R2512.2M
NC
R240 2.2M
NC
R241 82K
R250 82K
R243 2.2M
NC
R253 390K
NC
R252 390K
R242 100K
R737
10K
R751
100K
R227
10K
R282
1M
R223
12K
R273
12K
R279
12K
R209 10K
R271 100K
R232 10K
R233 10K
R280
1M
R210
10K R272 100K
1K
6
.
8K
R207
1K
R
205 6.8
K
R746
3.9K
R745
3.9K
R717 47K
R718 3.9K
R750
100K
R720
1.8K
R715
12K
R721
47K
R722 390K
R744
470
R734
2.7K R733 2.7K R732 2.7K R731 2.7K R704
3.9K R703 3.9K R702
3.9K
R736 3.3K
R735 10K
R723 2.7K R728 2.7K R729 2.7K R730 2.7K
R724
390
R822 3.9K
R823
10K
R821
1.8K
R817
390
R818
470
R819
820
R820
1K
R816
1K
R815
820
R814
470
R813
390
R230
10K
R228
10K
R265
47K
R266 56K R264
47K
R231
10K
R226 100K
R714
47K
R713 3.9K
R709
22K
R708
10K
R727
3.9K
R705
3.9K
R224
12K
R712 1M
R707
3.9K
R706
3.9K
R229 3.3K
C705
100/16
C233
4.7/50
C223 10/16 C221 10/16
C219 1/50
C237 4.7/50
C236 4.7/50
C235 4.7/50
C224 10/16
C222
10/16
C220 1/50
1/501/50
C234
4.7/50
GND4
LEVEL_R
LEVEL_L
2
ALBUM
REV.MODE
DOLBY C
STANDBY
FADE
REC
F.PLAY
R.PLAY
TAPE IN
DOLBY B
GND
LOAD IN SW
LOAD OUT SW
LOAD IN
LOAD OUT
MTR SPEED A
MTR SPEED B
GND
MTR
PLAY SW
5V
ROT SEN
R.REC SW
MTL SW
F.REC SW
SOL
HIGH SW
CASS IN SW
13
12
11
10
9
8
7
6
5
4
3
1
REW
FF
FADE
STOP
F.PLAY
R.PLAY
EJECT
REC/PAU
AUTO SPACE
ALBUM
#1,#8 NC
TAPE SPEED ADJ.
SOL
TEST POINT
LCHRCH
FT-1
FT-2
STBY
DOLBY NR
REV.MODE
CAP
RI RI

F901B FUSE_B
F901A
FUSE_A
5V
12V
12V
12V
5V
5V
12V
E854
22V
12V
5.6V 12V
5V
P903
P903A
P705A
P705
C102
681
C101 681
Q201
HA12169FB
19 20
21
61
62
63
64
66
75
77
78
79
80
BIASADJ[H] 37
BIASADJ[M] 36
BIASADJ[N] 35
BIASCONT[L] 28
BIASCONT[R]33
BIA_TRAPL1BIA_TRAPR60
C/B 44
CCRL5CCRR 56
CLK 39
CONT[L]73
CONT[R]68
DACOUT[L]29
DACOUT[R]32
DATA40
DGND47
EQCONT[L]13 EQCONT[R]48
EQIN[L]12 EQIN[R] 49
EQOUT[L]15 EQOUT[R]46
F/Q 25
FM 27
FQ 26
GH 24
GL 23
GND 34
GND171 GND270
GP 22
HLSL6HLSR 55
INJ 38
IREF14 LLSL7LLSR 54 LMDET[L]10 LMDET[R]51
LMIN[L]9LMIN[R] 52 LMOUT[L]11 LMOUT[R]50
MPX43
N.HIGH17 N.MTL18 N.NORM16 NR_ON/OFF45
PBOUT[L]2PBOUT[R]59 RECOUT[L]8RECOUT[R]53
RPI[L]PBIN76
RPI[R]PBIN65
RST42
SS1L3SS1R 58 SS2L4SS2R 57
STB41
VCC1 30
VCC2 31
VRI1[L]LINEIN72
VRI1[R]LINEIN69
VRI2[L]ACCUIN74
VRI2[R]ACCUIN
67
LED
Q701
TMP87CH14F
400/12K 44
70/120 47
ALBUM61
BIAS_CONT49
CAP 33
CASS_IN30
CLK20
CLOSE_SW40
CS23
DI21 DO22
DOL_B1
DOL_C63
DOL_RST43
DOOR_CLOSE36
DOOR_LOCK_OPEN14
DOOR_OPEN35
F.PLY15F.PLY26
F.REC18
FADE60
FT52
HIGH_SW31 KEY153
KEY254
KEY3[NC]55
LINE_MUTE46
LM[L] 50
LM[R] 51
MTL_SW17
NC17NC28NC39NC410 NC511 NC612 NC713
NC819
OPEN_SW41
OSC_OUT45
P-OFF15
PLAY
32
R.PLY13R.PLY24
R.REC16
R/P 48
REC59
REC_MUTE42
RESET29
REV.M
64
RI_IN 38
RI_OUT39
ROT.SEN.37
SOL 34
STB24
STBY62
TAPE_IN2
TEST[VSS]25
VAREF57
VASS56
VDD58VSS26
XIN27
XOUT
28
T901
NPT-1434*
2
4
5
6
7
P901A
X
X
X
P204
54
L204
NMC-6079
123 6
54
L203
NMC-6079
123 6
L401
NCH-4183
123
46
L402
NCH-4183
123
46
L403
NLO-2059
123
45
6
Q905
78M05
G
IO
Q903
78M12
G
IO
Q901
78M12
G
IO
P706A
P706
P702
1
P701
2
3
Q702
BR93LC46F-WE2
12
34
5678
X701
CST8.00MG
P902
D803 SEL6910D
D805 SEL6910D
D806 SLV332VR
D807 SLV332VR
D808 SEL6910D
D809 SEL6910D
D810 SEL6910D
D804 SEL6910D
D801 SEL6910D
D802 SEL6910D
S717
S810
S813
S812
S811
S809
S808
S807
S806
S805
S804
S803
S802
S801
P901 P401
P205
Q101 MPC1330HA
1 2 3 4 5 6 7 8 9
Q707 TA7291S
1
2
3
4
5
6
7
8
9
P101
Q204
DTA114YS
Q203
DTA114YS
Q708
DTA114YS
Q711
DTA114YS
D203
UDZS4.7B
D910
UDZS5.6B
D702
UDZS7.5B
D708
UDZS5.6B
P703
D902
GP1N4003
D901
GP1N4003
D908
1SS352
D909
1SS352
D706
1SS352
D201
1SS352
D701
1SS352
D703
1SS352
D202 1SS352
Q706
2SB1068
Q705
2SB1068
Q703
2SA933
Q403
2SA950
Q205
2SD655
Q206
2SD655
Q404
2SC1213C
Q405
2SC1213C
R801 820
R802 470
R803 820
R804 470
R807 470
R808 270
R809 270
R810 470
R811 470
R812 470
R805 470
R806 470
R410 47
Q710
DTC114YS
Q713
DTC114YS
Q207
DTC114YS
Q712
DTC114YS
Q704
DTC114YS
Q402
DTC114YS
C711
223
C710
223
C283 223
NC
C282 223
C239
104
C246
153
C249
223
C250
223
C248
104
C904104
C903
104 C917
104
C901
104
C702
223
C703
223
C214
104
C213
104
C212 104
C210 104 C208 222
C206
222
C204
222
C205
222
C203
222
C211 104
C209 104
C207 222
C918
223
C105
822
C106
822
C427 183
C240
104
C424
681
C426
680
C425 680
C423 681
C111
183
C112
183
C411
121/100
C416 472
C417 472
C709 104
C420
123/100
C418
223
C404
471
C402 103
C406
273
C412
121/100
C410
101/100
C408
273
C409
101/100
C407
273
C405
273
C403 471
C401 103
C247
394
C421
100/500
C704
223
L702
1MH
NC
L701
1MH
L406
4.7MH
L405 4.7MH
Q401 MPC1297CA
1 2 3 4 5 6 7 8 910
11 12 13 14 15 16 17
18
R716
5KB
R116
47KB
R115
47KB
Q209
DTC114TS
Q210
DTC114TS
Q103
DTC114TS
Q104
DTC114TS
Q102MPC1228HA
1 2 3 4 5 6 7 8
R255 2.2M
NC
R254 56K
R257 2.2M
NC
R256 68K
R258
82K
R259
33K
R261 2.2M
NC
R260 68K
R263 2.2M
NC
R262 390K
R245 2.2M
NC
R234
2.2MNC
R235 47K
R244 56K
R225
100K
R246 680K
R247 68K
R237 100K
R236 100K
R248
68K
R238
33K
R249
39K
R239
33K
R2512.2M
NC
R240 2.2M
NC
R241 82K
R250 82K
R243 2.2M
NC
R253 390K
NC
R252 390K
R242 100K
R202 22K
R267
1K
R269 6.8K
R219
1.8K
R737
10K
R751
100K
R285 4.7K
R284 4.7K
R283 4.7K
R221 4.7K
R118 1K
R117 120(1/2W)
R917 10K
R916
560
R914
470
R915
470
R726
3.9K
R281
1K
R274 390K
R227
10K
R282
1M
R223
12K
R273
12K
R279
12K
R209 10K
R271 100K
R232 10K
R233 10K
R280
1M
R210
10K R272 100K
R208
1K
R206
6.8K
R207
1K R205 6.8K
R204 560R203 560
R201 22K
R268 1K
R211 68K
R212 68K
R216 3.3K
R218
6.8K
R215 3.3K
R217
6.8K
R213
2.2K
R214
2.2K
R222
18K
R220
1.8K
R270 6.8K
R278
10K
R746
3.9K
R745
3.9K
R717 47K
R718 3.9K
R750
100K
R720
1.8K
R715
12K
R721
47K
R722 390K
R744
470
R725
330K
R734 2.7K R733 2.7K R732 2.7K R731 2.7K R704
3.9K R703 3.9K R702
3.9K
R736 3.3K
R735 10K
R110
120 R109
120
R119 1.5K
R120
1.5K
R102
100K
R104
470
R108
15K
R107
15K
R105
390K
R106
390K
R111
1.5K
R112
1.5K
R103
470
R723 2.7K R728 2.7K R729 2.7K R730 2.7K
R724
390
R822 3.9K
R823
10K
R821
1.8K
R817
390
R818
470
R819
820
R820
1K
R816
1K
R815
820
R814
470
R813
390
R230
10K
R228
10K
R265
47K
R266 56K R264
47K
R231
10K
R226 100K
R409
120
(1/2W)
R406
3.3K
R413
10
R113 3.9K
R114
3.9K
R41439K
R415
39K
R418
39K
R714
47K
R713 3.9K
R709
22K
R708
10K
R727
3.9K
R705
3.9K
R224
12K
R101100K
R712 1M
R707
3.9K
R706
3.9K
R275
1K
R276
330K
R412
5.6K
R411 39K
R417 4.7
R416 4.7
R405
3.3K
R407
22K
R408
22K
R229 3.3K
R403
330K
R401
100K
R402
100K
R404
330K
C705
100/16
C114
10/16
C113
470/16
C915
100/16
C909
1000/16
C907
1000/16
C905
4700/25
C916
10/16
C281 1/50
C233
4.7/50
C223 10/16 C221 10/16
C219 1/50
C237 4.7/50
C236 4.7/50
C235 4.7/50
C224 10/16
C222
10/16
C220 1/50
C218 2.2/50
C216
1/50
C217
2.2/50
C215
1/50
C241
10/16
C242 10/16
C230 10/16
C229 10/16
C225 10/16
C226 10/16
C231 10/16
C232 10/16
C227 1/50
C228 1/50
C238 1/50
C243 1000/16
C701
2.2/50
C104
2.2/50
C107
100/16
C108
100/16
C109
10/16
C110
10/16
C103
2.2/50
C234
4.7/50
C415
220/6.3
C419
47/16
C414
47/16
C422
10/16
C413
100/16
GND4
OSC
DAC_L
DAC_R
LEVEL_R
REC_R
STB
REC_MUTE
CLK
OSC_OUT
DO
LEVEL_L
REC_R
REC_L
RESET
REC_L
DAC_R
DAC_L
70/120
BIAS_CONT R/P
GND3
PING
MUT
12V1 12V2 12V3
GND2
+12VSIG
AC1 AC1
AC0
AC2 AC2
DC1
AC0
DC1
GND
AC-G
AC-H
2
70/120
R/P
ALBUM
REV.MODE
DOLBY C
STANDBY
FADE
REC
F.PLAY
R.PLAY
TAPE IN
DOLBY B
GND
LOAD IN SW
LOAD OUT SW
LOAD IN
LOAD OUT
MTR SPEED A
MTR SPEED B
GND
MTR
PLAY SW
5V
ROT SEN
R.REC SW
MTL SW
F.REC SW
SOL
HIGH SW
CASS IN SW
13
12
11
10
9
8
7
6
5
4
3
1
REW
FF
FADE
STOP
F.PLAY
R.PLAY
EJECT
REC/PAU
AUTO SPACE
ALBUM
#1,#8 NC
LINE MUTE
TAPE SPEED ADJ.
SOL
TEST POINT
LCHRCH
5.6
R/P
P.B.LEVEL
INPUT(R)
INPUT(L)
OUTPUT(R)
OUTPUT(L)
R ch L ch
FT-1
FT-2
STBY
DOLBY NR
REV.MODE
8.9
400/12K
70/120
P.B.LEVEL
REC L REC R
70/120
BIAS ON/OFF
(1/2W)
(1/2W)
CAP
RI
*
NPT-1434D<DT>
NPT-1434G<GT>
NPT-1434P<PP>
NC:Noused
K-501A
SCHEMATIC DIAGRAM
A
1
2
3
4
5
BCDEFGH
U1
U2
U3
Main circuit PC board
Power supply
circuit
PC board
Display circuit
PC board
BYMARK ARECRITICAL FOR SAFETY
IDENTIFIED
NOTE
THECOMPONENTS
REPLACEONLYWITH PARTNUMBERSPECIFIED.
.
.VOLTAGE(MEASUREDWITHVOLTMETER) IS DCVOLTAGE.(NO INPUT SIGNAL)
.ALL PNP TRANSISTORS ARE EQUIVALENT
.ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
.ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
.ELECTROLYTIC CAPACITORS ( )ARE IN F/WV.
.ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030-3pF 330-33pF 331-330pF 333-0.033uF
u
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 FORIMPROVEMENT.
.
.
TO 2SA1015-GR UNLESS OTHERWISE NOTED.
F901
2A/250V
NAAF-7383
NAPS-7384
NADIS-7385
TO MECHANISM
TO MECHANISM

K-501A
SCHEMATIC DIAGRAM
MECHANISM SECTION
R/P HD
E HD
L
R
1. L +
2. L -
3. R -
4. R +
5. E -
6. E +
Rec/Play/Erease Head
MTR
1
2
3
4
5
1
2
3
4
5
6
7
8
9
10
11
12
13
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
SOL
MTR
B
A
+
-
MECHA CHASSIS
Main circuit PC board
UNLOAD SW
COM
LOAD SW
MTR-(CW)(UNLOAD)
MTR+(CCW)(LOAD)
Control circuit PC board

C101 C102
C103
C104
C105
C106
C107
C108
C109 C110
C111
C112
C113
C113
C114
C203
C204
C205
C206
C207
C208
C209
C210
C211
C212
C213
C214
C215
C216
C217
C218
C219
C220
C221
C222
C223
C224
C225
C226
C227
C228
C229
C230
C231
C232
C233
C234
C235
C236
C237
C238
C241
C242
C246
C247
C281
C401
C402
C403
C404
C405
C406
C407
C408
C409
C410
C411
C412
C413
C414
C415
C416 C417
C418
C419
C420
C421
C422
C427
L203
L203
L204
L204
L401
L401
L402
L402
L403
L403
P204
P204
P205
P401
P101
P706A P903A
Q101 Q102
Q205 Q206
Q401
Q401
Q403
Q404
Q405
R115 R116
R117
R409
R410 R413
J126
J130
J131
J135
J129
J146 J143
J141
J102
J107
J106
J139
J140
J150
J142
J123
J145
J128
J127 J122
J134
J136
J132
J133
J124
J105
J104
J111
J103
J116
J110 J113
J112
J108
J114
L406
L406
L405
L405
J109
J137
J125
C243
C243
J144
J147
J118
J117
J115
J120
J121
J119
P.B.LRVEL
25137383A
NCAF-7383
1
J101
E853
E855
J152
J151
J153
J154
J1001 J1002 J1003 J1004
UJJ
UDT
UGT
UPP
RL
E851
C282
20
17
27
7
15
7
22
22
20 20
27
12 12
27
7
20
20
7
7
25
22 17
NAAF-7383
Component side from soldering side
A
1
2
3
4
5
BCD
K-501A
PRINTED CIRCUT
BOARD VIEW 1
U1
Main circuit PC board

NAAF-7383
C239
C240
C248
D201
D202
D203
Q103
Q104
Q201
Q201
Q203
Q204
Q207
Q209
Q210
Q402
R101
R102
R103
R104
R105
R106
R107
R108
R109
R110
R111
R112
R114
R118
R119
R120
R201
R202
R203
R204
R205
R206
R207
R208
R209
R210
R211
R212
R213
R214
R215
R216
R217
R218
R219
R220
R221
R222
R223
R224
R225
R226
R227
R228
R229
R230
R231
R232
R233
R234
R235
R236
R237
R238
R239
R240
R241
R242
R243
R244
R245
R246
R247
R248
R249
R250
R251
R252
R253
R254
R255
R256
R257
R258
R259
R260
R261
R262
R263
R264
R265
R266
R267
R268
R269
R270
R271
R272
R273
R274
R275
R276
R278
R279
R280
R281
R282
R401
R402
R404
R405
R406 R407
R408
R411
R412
R414
R415
R416
R417
R418
R515R514
R512
R507
R508 R509
R513
R510 R511 R505 R506
R502
R503
R518
R517
R516
R519
R113
R501
C424
C426
C425
C423
R504
R403
120
21
40
4160
61
80
R283
R284
R285
C250
C249
R520
LR
C283
Soldering side
A
1
2
3
4
5
BCD
K-501A
PRINTED CIRCUIT
BOARD VIEW 2
U1
Main circuit PC board

C701
C705
C904
C905
C905
C907
C907
C909
C909
C914 C915
C916
D901
D902
P701
P701
P901
P902
P902
P903
P702
P703
P705
P706
Q705 Q706
Q707
Q905
R716
R901
R902
R909
S717
X701
J902
J904
J901
J916
J915
J908
J920
J912
J913
J906
J932
J918
J924
J925
J922
J919
J931
J930
J921
J909
J923
J929
J928
J933
J911
J907
J905
J927
J926
J914
C903
Q903 Q901
F901A F901B
J903
NCPS-7384
25137384
T901
T901
F901
AC-H
AC-G
J935
J934
SPEED
C901
1
J917
FT
E854
J936
T2AL250V
J937
J938
E852
CLK
DI
DO
CS
STB
ROT_S
GND GND
5V
AC-GAC-H
D801D802
D803 D804 D805
D806
D807 D808 D809
D810
P705A
S801
S802S803S804
S805
S806
S807
S808
S809
S810
S811
S812 S813
J703
J701
J702
EJECT
FF REW
F_PLAY
R_PLAY
STOP
REC ALBUMFADE
A_SPACE REV_MODE DOLBY
STBY
NCDIS-7385
25137385
J704
J705
0
2
7
7
7
20
20
20
20
7
20
7
7
15
7
17
2
222
2
2
2 2
2
2
2
22
20
20
7
A
1
2
3
4
5
BCD
K-501A
PRINTED CIRCUIT
BOARD VIEW 3
U3 Display circuit PC board NADIS-7385
U2 Power supply PC board NAPS-7384
Component side from soldering side
Component side from soldering side

R805
R806
R807
R808 R809 R810
R811
R812
R813
R814R815R816
R817
R818
R819
R820 R821
R822
R823
C702
C703
C704
C709
C917
C918
D701
D702
D703
D706
D708
D908
D909
D910
Q701
Q701
Q702
Q703
Q704
Q708
Q710
Q711
Q713
R702
R703
R704
R705
R706
R707
R708
R709
R712
R713 R714
R715
R717
R718
R720
R721
R722
R723
R724
R725
R726
R727
R728
R729
R730
R731
R732
R733
R734
R735
R736
R744
R745
R746
R750 R751
R801
R802
R803
R804
R914
R915
R916
R917
R571
R572
R573
Q712
119
20
33 51
52
64
1
8
R737
C710
L701
L702
C711
A
1
2
3
4
5
BCD
K-501A
PRINTED CIRCUIT BOARD VIEW 4
U2 Power supply PC board
U3 Display circuit PC board NADIS-7385
NAPS-7384 Soldering side
Soldering side

K-501A
PARTS LIST
CIRCUIT PARTS 1
REF. NO. PART NO. DESCRIPTION
ICs
Q101 22240147 MPC1330HA
Q102 222905 MPC1228HA
Q201 22241144R3HI HA12169FB
Q401 222959 MPC1297CA
Q701 22241751R3 TMP87CH14F-3JJ5
Q702 22241609R2 BR93LC46F-WE2
Q707 22240239 TA7291S
Q901,Q903 222780125NEC or MPC78M12HF
222780125JRC NJM78M12FA
Q905 222780055 78M05HF
Transistors
Q103,Q104 2216680R2 RN1411
Q203,Q204 2216360R2 RN2407
Q708,Q711 2216480R2 DTA114YKA
Q205,Q206 2211705 or 2SD655-E
2211706 2SD655-F
Q207,Q402 2216260R2 RN1407
Q704,Q710 2216470R2 DTC114YKA
Q712,Q713
Q209,Q210 2216670R2 DTC114TKA
Q403 2211504 2SA950-Y
Q404,Q405 2201883 2SC1213-C
Q703 2214640R2 2SA1037K
Q705,Q706 2212853 or 2SB1068-K
2212855 2SB1068-U
Diodes
D901,D902 22380035 or GP104003E
22380260 RL1N4003
D201,D202 223234R2 or 1SS352
223269R2 1SS355
D701,D703 223234R2 or 1SS352
223269R2 1SS355
D706,D908 223234R2 or 1SS352
223269R2 1SS355
D909 223234R2 or 1SS352
223269R2 1SS355
D203 224550470R2 UDZS4.7B
D702 224550750R2 UDZS7.5B
D708,D910 224550560R2 UDZS5.6B
LEDs
D801,D802 225390 SEL2910A-TP6
D803 225322 SEL6210S
D804,D805 225324D SEL6910A-D
D806 225404 SEL2210R TP6
D807-D810 225390 SEL2910A-TP6 Note
<PP>...Europian model only
<DT>...120V model only
<GT>...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. PART NO. DESCRIPTION
Coils
L401,L402 231127 NCH-4183
L405,L406 231085 NCH-2133
L203,L204 233407 NMC-6079
L403 231215 NLO-2059
L701 230955R2 BK1608HS102-T
Oscillator
X701 3010341 CSTLS8M00G56
Capacitors
C243,C907 354741029 1000uF,16V,Elect
C909
C107,C108 354741019 100uF,16V,Elect
C413,C705
C915
C109,C110 354741009 10uF,16V,Elect
C221-C226
C229-C232
C241,C242
C422,C916
C114
C113 354744719 470uF,16V,Elect
C414,C419 354744709 47uF,16V,Elect
C215,C216 354780109 1uF,50V,Elect
C219,C220
C227,C228
C238,C281
C217,C218 354780229 2.2uF,50V,Elect
C701
C233-C237 354780479 4.7uF,50V,Elect
C415 354722219 220uF,6.3V,Elect
C101,C102 374726814 ECQ-B50V-681J
C105,C106 374728224 ECQ-B50V-822J
C111,C112 374721834 ECQ-B50V-183J
C203-C208 374722224 ECQ-B50V-222J
C209-C214 374721044 ECQ-V50V-104J
C247 374723944 ECQ-V50V-394J
C901,C903 374721044 ECQ-V50V-104J
C904
C409,C410 370131014 APS100V-101J
C411,C412 370131214 APS100V-121J
C420 370131234 APS100V-123J
C103,C104 391980227 2.2uF,50V,Elect
C905 391963327 3300uF,35V,Elect Note
<PP>...Europian model only
<DT>...120V model only
<GT>...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. PART NO. DESCRIPTION
R117,R409 443521214 120ohm +/-5% 1/2W,Metal oxide
R410 443524704 47ohm +/-5% 1/2W,Metal oxide
R413 443521004 10ohm +/-5% 1/2W,Metal oxide
R115,R116 5210296 N06HR47KBE,Trimming
R716 5210261 N06HR5KBC,Trimming
Switches
S717 25035699 NPS-111-S662
S801-S813 Heat sink
Q901A 27160391 HEAT SINK
Fuse holders
F901A,F901B 25052133 NSCT-1P2031 <GT,PP>
Jacks
P204 25045305 NPJ-4PDBL164
P701 25045330 NPJ-2PDBL184
Plugs
P101 25055136 NPLG-6P120
P205 25055689 NPLG-2P645
P401 25055132 NPLG-2P116
P702 25055157 NPLG-13P141
P703 25055149 NPLG-5P133
P705 25055158 NPLG-14P142
P706 25055709 NPLG-13P665
P901 25055675 NPLG-2P631
P903 25055704 NPLG-8P660
Sockets
P706A 25051238 NSCT-13P1028
P902 25051990 NSCT-2P1777 <DT>
25051637 NSCT-2P1424 <GT>
25051637 NSCT-2P1424<PP>
P903A 25051233 NSCT-8P1023
P705A 2002E392825 NSAS-28P1000
Holder
E852 27190608-1 (CRAMP) UA-0 V0
Retainer
E854 27141059
Clamp
E851 260224 CP-1S
Screws
Q901A,Q903B 82143010 3P+10FN(BC),Pan head screw
Note
<PP>...Europian model only
<DT>...120V model only
<GT>...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
MICROPROCESSOR CONNECTION DIAGRAM
Q701:TMP87CH14F
K-501A
47K
220K
SYSTEM BUS
5V
11.5V 11.5V
5V
+5V
11.5V
10K 3.9K 1.8K 1K 820 470 390 1K 820 470 390
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
64 63 62 61 60 59 58 57 56 55 54 53 52
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
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
CLK DI DO CS STB TEST VSS XIN XOUT RESET CASS IN
HIGH SW
PLAY
G10 G11 G12 G13 G14 G15
VDD
VAREF
VASS
NC K2 K1 FT
DOL B
TAPE IN
R.PLY1
R.PLY2
F.PLY1
F.PLY2
N1
N2
N3
N4
N5
N6
N70
DOOR LOCK OPEN
P-OFF
R.REC
MTL SW
F.REC
NCB
Q601
Q711
R-REC SW
MECHA
METAL
POSITION
SW
MECHA
F-REC SW
MECHA
Q702
BR93LC46F-WE2
Q201
HA12169FB
DOLBY DECODER
X701
8MHz
Q710 CASSETTE
IN SW
MECHA
PLAY SW
MECHA
HIGH
POSITION SW
MECHA
CAPSTAN-
MOTOR
MECHA
SOLENOID
MECHA
Q707
TA7291S
ROT SENSOR
TRAY CLOSE
TRAY OPEN
Q203.Q204
Q205.Q206
Q102
Q201
Q101
L401 L402
Q401
SYSTEM RESET
MOTOR
DRIVE
TRAY
MOTOR
DRIVER
POWER
FAILURE
DET.
DET SWITCH DET SWITCH
FADE ALBUM STOP F.PLAY R.PLAY REW FF EJECT
NC (+5V)
NC (+5V)
NC (+5V)
NC (+5V)
NC (+5V)
NC (+5V)
NC(GND)
REC/PAU AUTO SPACE REV. MODE DOLBY NR STANDBY
+5V
FT 1 FT 2

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