FILE NO.
Service Manual
Compact Cassette Recorder
TRC-2050C
(XE)
(US)
Contents
Tape adjustments ............................................................1
Exploded view .................................................................. 2
Parts list ...........................................................................3
Wiring connection ............................................................4
Schematic diagram
(AMPLIFIER).................................................................6
Wiring diagram
(SWITCH)......................................................................5
(AMPLIFIER).................................................................8
PRODUCT CODE No.
164 100 00(XE)
164 100 01(US)
REFERENCE No.
SM5810410
TAPE ADJUSTMENTS
a. Adjusting Azimuth
• Be sure to clean the heads before attempting to make any adjustment.
• Be sure both channel's waveform are the same for the phase matching.
• Be sure both channels (1 and 2) are the same level using a dual-channel oscilloscope.
• After completion of the adjustment, apply the threadlock (TB-1401B) to the azimuth adjustment screws to fix them securely.
(1) Load an azimuth adjustment test tape (VTT-703 etc., 10 kHz)
in tape deck.
(2) Press the PLAY button.
(3) Use a cross-tip screwdriver to turn the screw for azimuth
adjustment so that the left and right outputs are maximized.
(4) Press the STOP button.
HEAD AZIMUTH ADJUSTMENT
PLAY
b. Replacing the Head
• After replacing the head, demagnetize the head by using a
degausser.
• All wiring should be returned to the original position after work is
completed.
c. Adjusting Tape Speed
• Use a plastic screwdriver for adjustment.
(1) Inset the test tape (TCC-119 etc., 3000 Hz).
(2) Press the PLAY button.
(3) Use a flat-tip screwdriver to turn the VR403 to adjust so that
the frequency counter becomes 3000 Hz.
TAPE SPEED CONTROL
TAPE PLAY SPEED
SLOW NOR FAST
R / P HEAD
WHITE
WHITE
MOTOR SPEED
ADJUSTMENT
BLACK
GRAY
2.4 4.8
SPEED
d. Checking the Mechanism Torques
• Clean the head, capstan and pinch roller before making any measurement.
Measurement Take-up torque Back tension Tape tension
Cassette for PLAY : TW-2111A
measurement F.FWD / REW : TW-2231 TW-2412
PLAY 23~50 gr.cm 1.0~5.0 gr.cm 30 gr or more
F.FWD 55 gr.cm more --- ---
REW 55 gr.cm more --- ---
PLAY : TW-2111A
- 1 -
Drive-power cassette
EXPLODED VIEW
1
CABINET & CHASSIS
3
2
11
4
5
6
71
7
16
14
17
12
15
18
TM2050CTN-SH
19
Y02
20
8
9
10
13
TM1
Y01
TAPE MECHANISM
TM2050CTN-SH
TM2
TM5
TM3
Y01
TM4
27
21
72
24
22
23
Y03
25
26
Y04
Y04
- 2 -
PARTS LIST
PRODUCT SAFETY NOTICE
EACH PRECAUTION IN THIS MANUAL SHOULD BE FOLLOWED DURING SERVICING. COMPONENTS IDENTIFIED WITH THE IEC
SYMBOL
CAN BE OF SPECIAL SIGNIFICANCE. WHEN REPLACING A COMPONENT IDENTIFIED BY
DESIGNATED, OR PARTS WITH THE SAME RATINGS OF RESISTANCE, WATTAGE OR VOLTAGE THAT ARE DESIGNATED IN THE
PARTS LIST IN THIS MANUAL. LEAKAGE-CURRENT OR RESISTANCE MEASUREMENTS MUST BE MADE TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT BEFORE RETURNING THE PRODUCT TO THE
CUSTOMER.
CAUTION : Regular type resistors and capacitors are not listed. To know those values, refer to the schematic diagram.
N.S.P : Not available as service parts.
!!
!
IN THE PARTS LIST AND THE SCHEMATIC DIAGRAM DESIGNATED COMPONENTS IN WHICH SAFETY AND PERFORMANCE
!!
!
, USE ONLY THE REPLACEMENT PARTS
Regular type resistors are less than 1/4 W carbon type and 0 ohm chip resistors.
Regular type capacitors are less than 50 V and less than 1000 µF type of Ceramic type and Electrical type.
PACKING & ACCESSORIES
REF.NO. PART NO. DESCRIPTION
614 325 9411 CARTON CASE,INNER(XE)
614 326 9113 CARTON CASE,INNER(US)
614 327 5428 CUSHION
614 326 2756 CASE,CARRYING
614 325 9435 INSTRUCTION MANUAL(XE)
614 327 0430 INSTRUCTION MANUAL(US)
645 016 1018 ADAPTOR,AC-DC(US Only)
CABINET & CHASSIS
REF.NO. PART NO. DESCRIPTION
1 614 325 6854 DEC,MIC
2 614 325 8650 ASSY,LID,CASSETTE
3 614 325 6984 SPRING,OPEN
4 614 325 6816 BUTTON,INDEX
5 614 325 6922 KNOB,SLIDE,REC,MODE
6 614 325 6861 DEC,WINDOW,LED
7 614 325 6847 COVER,LID
8 614 294 5346 LEVER,REC
9 614 295 9763 SPRING,WIRE,REC LEVER
10 614 326 8802 ASSY,CABINET(XE)
10 614 326 8826 ASSY,CABINET(US)
11 614 246 5776 COUNTER
12 614 325 6953 SPACER,MECHA,COUNTER
13 614 268 8298 STRAP,SET
14 614 325 6762 BUTTON,REC
15 614 325 6779 BUTTON,PLAY
16 614 325 6786 BUTTON,STOP
17 614 325 6793 BUTTON,REW
18 614 325 6809 BUTTON,FWD
19 614 295 9251 BELT,SQUARE,COUNTER
20 614 294 5353 LEVER,RP
21 614 325 6991 TERMINAL,BATTERY(-)
22 614 295 9770 TERMINAL,(+)
23 614 325 6915 KNOB,SLIDE,PLAY,SPEED
24 614 325 6892 KNOB,SLIDE,VAS
25 614 325 6946 LID,BATTERY
26 614 325 8643 ASSY,CABINET,BOTTOM
27 614 325 6908 KNOB,SLIDE,PAUSE
FIXING PARTS
REF.NO. PART NO. DESCRIPTION
Y01 411 098 5202 SCR S-TPG PAN 2X5,
LID,CASSETTE/COVER
Y02 411 022 7708 SCR S-TPG PAN 2X5,MECHA/CABI
Y03 411 022 7807 SCR S-TPG PAN 2X6,PWB/CABI
Y04 411 022 8606 SCR S-TPG PAN 2X8,CABI-CABI REAR
SWITCH P.W.BOARD ASSY
REF.NO. PART NO. DESCRIPTION
71 614 325 5048 ASSY,PWB,SW(Only Initial)
D4200 407 229 9409 LED SML-311DT
IC420 409 525 6601 IC TC7WB66FK
S4200 645 057 0056 SWITCH,SLIDE 2P-2T,DICT/CONFSW
S4201 645 018 0361 SWITCH,PUSH 1P-1T,CUE-INDEXSW
AMPLIFIER P.W.BOARD ASSY
REF.NO. PART NO. DESCRIPTION
72 614 325 5031 ASSY,PWB,AMP(Only Initial)
C4701 403 355 9306 TA-SOLID 47U M 6.3V
C4708 403 355 9306 TA-SOLID 47U M 6.3V
C4723 403 355 9306 TA-SOLID 47U M 6.3V
C4801 403 355 9306 TA-SOLID 47U M 6.3V
C4812 403 355 9306 TA-SOLID 47U M 6.3V
CN401 645 057 0063 JACK,PHONE D3.6,EXTMIC
or 645 061 3418 JACK,PHONE
CN402 645 057 0063 JACK,PHONE D3.6,EXTMIC
or 645 061 3418 JACK,PHONE
CN403 645 057 0582 JACK,PHONE D2.5,REMOTE
CN405 645 057 0070 JACK,PHONE D3.6,EARPHONE
or 645 061 3401 JACK,PHONE
CN491 645 027 2998 SOCKET,DC,DCJACK
D4001 407 003 3609 DIODE DAN202K
D4002 407 149 0807 DIODE 1SS355
D4003 407 149 0807 DIODE 1SS355
D4701 407 206 5608 ZENER DIODE UDZS10B
D4801 407 206 5608 ZENER DIODE UDZS10B
D4901 407 206 5608 ZENER DIODE UDZS10B
D4921 407 225 0301 DIODE RB161M-20
IC401 409 245 5106 IC LA4167M
IC402 409 245 5106 IC LA4167M
IC403 409 525 6601 IC TC7WB66FK
IC404 409 543 7307 IC TC7SB66FU
IC405 409 525 6601 IC TC7WB66FK
IC406 409 543 7307 IC TC7SB66FU
IC407 409 543 7307 IC TC7SB66FU
IC408 409 543 7307 IC TC7SB66FU
IC409 409 525 6601 IC TC7WB66FK
Q4001 405 011 1006 TR 2SC1623-L6
or 405 146 2107 TR KTC3875-Y
or 405 146 2206 TR KTC3875-GR
or 405 014 4509 TR 2SC2412K-R
Q4002 405 146 2206 TR KTC3875-GR
or 405 146 2107 TR KTC3875-Y
or 405 011 1006 TR 2SC1623-L6
or 405 014 4509 TR 2SC2412K-R
Q4003 405 146 2206 TR KTC3875-GR
or 405 146 2107 TR KTC3875-Y
or 405 011 1006 TR 2SC1623-L6
- 3 -
PARTS LIST
REF.NO. PART NO. DESCRIPTION REF.NO. PART NO. DESCRIPTION
or 405 014 4509 TR 2SC2412K-R
Q4004 405 014 4509 TR 2SC2412K-R
or 405 011 1006 TR 2SC1623-L6
or 405 146 2206 TR KTC3875-GR
or 405 146 2107 TR KTC3875-Y
Q4005 405 146 2206 TR KTC3875-GR
or 405 146 2107 TR KTC3875-Y
or 405 011 1006 TR 2SC1623-L6
or 405 014 4509 TR 2SC2412K-R
Q4006 405 021 2307 TR 2SD1048-X6
or 405 021 2406 TR 2SD1048-X7
Q4007 405 157 6507 TR XP151A13A0M
Q4902 405 064 6300 TR 2SB1295-6
or 405 064 6409 TR 2SB1295-7
Q4903 405 149 6109 TR KRC103S
or 405 141 4403 TR DTC124EKA
S4001 645 059 8012 SWITCH,PUSH,R/P SW
or 620 199 9839 SWITCH,PUSH,4-2,R/P SW
S4002 645 057 0056 SWITCH,SLIDE 2P-2T,2.4/4.8 SW
S4003 645 026 2630 SWITCH,SLIDE 2P-3T,PLAYSPEEDSW
S4004 645 057 2470 SWITCH,SLIDE,PAUSESW
S4005 645 026 2623 SWITCH,SLIDE 1P-2T,VASSW
VR401 645 057 0032 VR,ROTARY 10KBX2,VOL
VR471 645 026 5495 VR,SEMI,1K S,SPEED VR
Q4008 405 157 6507 TR XP151A13A0M
Q4009 405 005 5508 TR 2SA812-M6
or 405 002 0308 TR 2SA1037K-R
or 405 134 5905 TR 2SA1037AK-R
or 405 146 1704 TR KTA1504-Y
or 405 146 9700 TR KTA1504-GR
Q4010 405 141 4403 TR DTC124EKA
or 405 149 6109 TR KRC103S
Q4011 405 141 4403 TR DTC124EKA
or 405 149 6109 TR KRC103S
TAPE MECHANISM
REF.NO. PART NO. DESCRIPTION
614 325 8896 ASSY,MECHA,TM-2050CTN-SH
TM1 645 027 2318 HEAD,ERASE
TM2 645 059 8296 HEAD,R/P
TM3 645 027 2561 ASSY,PINCH ROLLER
TM4 645 059 7305 ASSY,MOTOR
TM5 645 027 2745 MAIN BELT
WIRING CONNECTION
TAPE DECK
MECHANIZUM
M
HEAD A
HEAD B
PLAY SWITCH
CN403
REMOTE
BLACK
RED
BATT +
RED
BLACK
P.SW
CN491
EXT. DC 3V
+
-
MOTOR
P.SW
BATTERY
HEAD-A -
SP +
SP -
DC 3V
HEAD-A +
BLACK
SWITCH P.W.B
HEAD-B +
HEAD-B -
AMPLIFIER
P.W.B
RED
MIC2-GND
MIC1
-GND
BLUE
WHITE
GRAY
MIC-1 +
MIC-2 +
RED
BATT -
CN405
MIC 2
CN402
MIC 1
CN401
HP
This is a basic wiring connection.
MIC 1MIC 2SPEAKER
- 4 -
WIRING DIAGRAM (SWITCH)
PARTS SIDE VIEW
LED
CUE
GND
3V
DICT
CONF
CAN4200
D4200
R4201
94V-0 F01
1AD4B10D1720B
14
IC420
58
R4204
R4205
C4201
C4200
R4203
R4202
CONF
PATTERN SIDE VIEW
INDEX
S4201
94V-0 F01
1AD4B10D1720B
S4200
DICT
This is a basic wiring diagram.
- 5 -
SCHEMATIC DIAGRAM (AMPLIFIER)
CN401
MIC 1
(L-CH)
CN402
MIC 2
(R-CH)
1
2
6
3
4
5
2.2K
R4718
1
2
6
3
4
5
R4730
1K
IC404
TC7SB66FU
4
5
2
3
1
CONF DIC
6
-1 S4200-2
4
S4200
5
IC420
TC7WB66FK
R4202
100K
R4203
100K
C4200
0.1
C4201
0.1
8765
R4204
D4200
SP
POWER
S4201
CUE-INDEX
2.2K
2.2K
R4205
R4201
180
S4001:RECORD/PLAY SW
S4002:TAPE SPEED SW
S4003:PLAY SPEED SW
S4004:PAUSE SW
S4005:VAS SW
MIC41
DICT
(L-CH)
CONF
MIC42
(R-CH)
S4200:REC MODE SW
1234
3V
GND
LED
DICT
CONF
12345678
12345678
3
GND
CE
2
OUT
VDD
1
IN
1K
R4830
CUE-INDEX
DICT
CONF3VGND
CUE-INDEX
LED
R4818
2.2K
TC7WB66FK
S4201:CUE-INDEX SW
R4045
100K
8765
IC409
1234
Q4902
2SB1295
R4908
47K
Q4903
KRC103S
R-CH
L-CH
CN403
REMOTE
R4901
1.5K
-2
100K
-1
21
PLAY
10K
R4710
C4702
8200P
C4703
0.015
REC
R4753
0
0.1 6.8K
R4708
C4707 R4709
4.7K
R4717
0.01
C4715
C4716
1000P
R4043
TC7WB66FK
IC403
7
4.82.4
-1
S4002
-1
S4001
(B2)
47;6.3-T
C4701
C4750
VR401
4.7K
6
TC7WB66FK
100K
R4044
3
5
680
R4703
R4704
0.01
R4707
-1
5.6K
10K
C4708
R4712
1M
0.01
C4751
C4704
4.7
56
R4705
C4706
0.047;B
R4706
18K
R4711
470K
47;6.3-T
(B2)
C4709 C4809
1.0 1.0
S4005
C4710
0.47
0.4718K
C4711R4714
560K
R4713
C4713R4715
0.11
C4714R4716
0.11
0.1
C4731
IC401
LA4167M LA4167M
1.6
123456789101112131415
PRE-NF
27K
1.5
PRE-OUT
4700P
C4705
1.6
REC-IN
1.6
REC-OUT
0
ALC-CONT
0
VOX-CONT
1.4
0
VOX
VOX-DELAY
0
CUE TONE ON/OFF
CUE TONE OSC
CUE-TONE
1.6
1.6
CUE TONE OUT
1.6
POWER-IN
1.2
1
POWER-OUT1
0
POWER GND
1.2
2
POWER-OUT2
3.0
VCC
(L-CH)
300K
RX
VAS
51.5dB
R4720
6.8K
123
IN
OUT
GND
IC408
CE
VDD
TC7SB66FU
54
EQ
MIC
REC
20K
ALC
VOX
2K
RXRX
MIC
VCC
VREF
R/PR.F
PAUSE
GVN
PRE-GND
EQ-IN
RX
MIC-IN
VREF-OUT
MIC-VCC
AF-OUT
LED-DRIVE
R/P-SW
PAUSE
R/P-MUTE
GVN-CONT
GVN-VREF
2.8
GVN-GND
GVN-OUT
0
302928272625242322212019181716
1.6
1.6
1.6
2.7
1.6
0.2
1.6
2.7
0.7
1.2
0.2
1.3
VS
0
1.7
C4721
4700P
R4728
C4724
C4726
R4014
C4723
10K
R4727
560
470
C4722
R4012
R4013
0.1
220;4
22/6.3
3.3K
C4720
3900P
1K
47;6.3-T
C4725
UDZS10B
C4727
0.1
(B2)
220;4
OFF ON
R4752
1K
120K
R4723
VR471
4.8
2.4
D4701
C4730
0.022
3.3K
R4719
S4002-2
1K
S4004
D4001
S4003
REC
S4001-2
PLAY
DAN202K
SLOW
NOR
FAST
Q4002
Q4003
R4026
R4030
R4034
C2412K
R4025
C2412K
8.2K
R4032
R4033
10K
R4028
10K
R4021
R4023
2.2K
10K
R4027
680
10K
Q4005
Q4006
C2412K
5.6K 130
10K
910
Q4001
Q4004
D1048
-1
IC405
TC7WB66FK
3
R4022
2.2K
C2412K
R4024
10K
C2412K
R4029
10K
R4031
C4842
10K
R4810
6.8K
R4809
0.1
C4807
2.2
R4817
R4841
470K
123
IN
VDD
54
4.7K
C4815
OUT
R4808
CE
R4015
4.7K
C4801
4.7K
0.01
C4816
GND
(B2)
47;6.3-T
VR401-2
S4001-3
1000P
IC406
TC7SB66FU
65
C4802
8200P
C4803
0.015
C4841
2.2
R4803
C4850
0.01
10K
PLAY
C4812
680
REC
R4853
R4812
47;6.3-T
-2
TC7WB66FK
7
12
C4804
R4804
56
4.7/25
C4806
0.047
R4807
5.6K
R4811
0
C4808
47/4
1M
C4810
0.47
560K
R4813
R4815
1
C4831
C4851
0.01
C4813
0.1
C4814R4816
0.11
0.1
R4806
18K
470K
R4814C4811
R4805C4805
18K0.47
27K4700P
C4901
1.6
PRE-NF
1.5
PRE-OUT
1.6
REC-IN
1.6
REC-OUT
0
ALC-CONT
0
VOX-CONT
1.4
0
VOX
VOX-DELAY
0
CUE TONE ON/OFF
CUE TONE OSC
CUE-TONE
1.6
1.6
CUE TONE OUT
1.6
POWER-IN
1.2
POWER-OUT1
0
POWER GND
1.2
POWER-OUT2
3.0
VCC
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
220/4
1
2
IC402
300K
VAS
RX
(R-CH)
EQ
51.5dB
MIC
REC
20K
ALC
VOX
VREF
R/PR.F
0
PRE-GND
1.6
EQ-IN
C4821
MIC-IN
AF-OUT
R/P-SW
PAUSE
2.8
4700P
1.6
1.6
2.7
1.6
0.2
1.6
2.7
0.7
1.2
0.2
1.3
VS
0
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
1.7
4.7K
R4003
RX
VREF-OUT
2K
RXRX
MIC-VCC
LED-DRIVE
MIC
VCC
R/P-MUTE
PAUSE
GVN-CONT
GVN-VREF
GVN-GND
GVN
GVN-OUT
C4823
C4825
C4826
R4820
6.8K
C4820
3900P
C4824
R4823
120K
4.7K
R4004
C4822
0.1
220;4
IN
47/4
220;4
22/6.3
100K
R4011
Q4007
XP151A13A0MR
VDD
OUT
C4828
0.1
R4701
R4801
45
321
CE
R4035
120K
39
39
GND
R4010
100K
IC407
TC7SB66FU
3.3K
R4819
0.022
C4830
S4001-4
REC PLAY
1SS355
Q4008
D4002
XP151A13A0MR
D4801
UDZS10B
1SS355
D4003
D4901
UDZS10B
D4921
C4031
RB161M
470/4
1
2
6
3
4
5
CN491
CN405
POWER SW
HEAD PHONE
This is a basic schematic diagram.
Q4011 Q4010
KRC103S KRC103S
- 7 -- 6 -
Q4009
KTA1504
R4001
470K
R4002
47K
C4030
220/4
WIRING DIAGRAM (AMPLIFIER)
PARTS SIDE VIEW PATTERN SIDE VIEW
CN405
H.P
C4030
CAN4953
CAN4954
S4001
D4701
R4044
CAN4952
IC403
CN402
Q4903
CAN4951
58
IC409
R4045
R4704
C4704
CAN005
58
14
MIC2
D4002
D4003
R4035
14
IC407
58
IC405
CAN006
R4753
C4726
CN401
R4011
R4010
Q4007
R4730
IC404
C4901
R4820
6
14
IC408
FAST
MIC1
Q4008
C4823
R4718
C4830
D4801
C4804
R4720
SLOW
NOR
R4003
R4004
R4701
C4725
C4724
CAN4712
CAN003
CAN004
VR401
CAN4821
CAN4818
CAN4822
CAN4803
+
C4801
R4013
C4031
S4003
CAN4802
CAN4817
C4826
C4812
C4816
R4808
CAN4703
CAN4722
CAN4718
+
C4808
CN403
S4005
ON
R4717
R4801
VAS SW
C4841
R4841
R4817
C4824
C4825
C4842
R4034
D4001
Q4002
Q4004
R4024
R4023
R4027
R4025
Q4003
R4026
OFF
S4004
PAUSE SW
R4015
IC406
R4021
R4022
Q4001
R4028
R4029
Q4005
R4030
Q4006
R4031
R4033
R4032
4.8
2.4
CN491
ON
OFF
1AD4B10D1720A
94V-0 F01
S4002
HP
BATT-
LED
MOTOR-
BATT+
R4908
Q4902
CUE
GND
3V
DICT
CONF
R4043
HEAD-A+
C4701
+
R4708
C4702
C4703
MOTOR+
D4901
MIC2 MIC1
MIC-2+
R4818
R4830
MIC2_GND
MIC1_GND
R4901
R4805
HEAD-B+
R4853
HEAD-B-
C4803
C4727
C4723
C4720
HEAD-A-
R4709
R4710
C4730
R4703
R4719
C4707
11015
R4705
CAN001
R4001 R4002
ON
VAS
Q4009 Q4010
Q4011
OFF
MIC-1+
C4828
C4820
R4819
11015
C4851
C4805
C4806
R4807
C4850
R4804
C4802
R4810
R4803
+
C4722
C4721
C4751
R4706
C4705
C4706
C4708
C4750
R4707
C4821 C4822
R4806
C4807
R4809
IC401
R4711
+
CAN002
CAN4826
+
IC402
R4811
+
CAN4808
R4012
R4723
R4014
C4716
C4711
C4709
R4713
C4710
C4809
R4728
R4727
C4731
R4714
R4712
C4715
R4823
162030
162030
C4814
R4814
C4811
R4813
R4812
C4810
C4815
VR471
CAN4717
SP+
C4714
R4716
CAN4907
CAN4828
CAN4827
C4831
R4816
R4815C4813
CAN4800
CAN4752
CAN4751
CAN4700
CAN4721
CAN4900
C4713
CAN4903
CAN4901
R4715
CAN4904
CAN4906
CAN4851
CAN4706
SP-
CAN4905
CAN4902
D4921
NOR
FAST
SLOW
P.SW
CAN007
ON
PAUSE
OFF
94V-0 F01
CAN4805
1AD4B10D1720A
CAN4850
CAN4852
R4752
CAN4753
CAN4750
CAN4705
CAN4702
4.82.4
TAPE-SPEED
P.SW
This is a basic wiring diagram.
Apr. / '03 BB Printed in Japan
SANYO Electric Co., Ltd.
Osaka, Japan
- 9 -- 8 -
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