Sony TC-W421 User manual

TC-W421
SERVICE MANUAL US Model
Canadian Model
E Model
TC-W421 is the cassette deck section of
the stereo component system SEN-421CD.
Model Name Using Similar Mechanism | HST-121/221
Tape Transport Mechanism Type TCM-180VW-H5
SPECIFICATIONS
Recording system 4-track 2-channel stereo
Frequency response (DOLBY NR OFF)
With TYPE Il cassette (Sony
UCX-S): 30 — 14,000 Hz (+3 dB)
With TYPE | cassette (Sony HF-S):
30 — 13,000 Hz (+3 dB)
Wow and flutter 0.12% WRMS (NAB)
Dimensions Approx. 430 x 120 x 280 mm
(w/h/d)
(17 x 4°/, x 11*/, inches)
Weight Approx. 3.5 kg (7 Ib 12 oz) net
Design and specifications are subject to change without
notice.
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol 9 are trademarks of
Dolby Laboratories Licensing Corporation.
STEREO CASSETTE DECK
SONY.

TC-W421 |
TABLE OF CONTENTS
Section Title Page
Specifications ee meee reer esr ernererreseneresaeeseseve ]
1. GENERAL. ««ssseevisssvesee seep ateeeens 2
2. ADJUSTMENTS
2-1. Mechanical Adjustment -++++++++++++eeeeee 3
2-2. Electrical Adjustments -+-+++++++++ee eee eeeee 3
3. DIAGRAMS
3.] . Block Diagram Ce eee er ee 7
3-2. Printed Wiring Boards ++++++++rerr eer ee eres 9
3.3, Schematic Diagram ee ee ee ee ere ee a 1] ]
4, EXPLODED VIEWS alee Be Rea Leste relia sqe ales ess 15
5. ELECTRICAL PARTS LIST ------------ 18
SECTION 1
GENERAL
PARTS IDENTIFICATION
— Front Panel —
Deck A TAPE SELECTOR
Deck B PEAK LEVEL METER
Deck A
Deck B TAPE SELECTOR
eee or oe EE
Deck A REC LEVEL control
Tape operation buttons
DUBBING SPEED selector
Deck B ;
Tape operation buttons DOLBY NR switch

TC-W421
SECTION 2
ADJUSTMENTS
2-1. MECHANICAL ADJUSTMENT
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened swab:
record/playback head pinch rollers
erase head rubber belts
capstan idler
2. Demagnetize the record/playback head with a head demagnetizer.
Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the parts
adjusted.
5. The adjustments should be’ performed in the rated power supply
voltage unless otherwise noted.
w&
Torque Measurement
Torque Meter
Meter reading
30 — 70 gecm
(0.42 — 0.97 ozeinch)
FWD back tension CQ-102C (0.01 ni 063 seaacl)
70 — 160 gecm
FF, REW CQ-201B
(0.97 — 2.21 ozeinch)
2-2. ELECTRICAL ADJUSTMENTS
Note: The adjustment should be performed in the order given in the
service manual. As a rule, adjustments about playback should be
performed before those about recording. The adjustments should
be performed for L-CH and R-CH.
@ Switches and controls should be set as follows unless otherwise
specified.
DOLBY NR switch: OFF
@ Standard Record:
Deliver the standard input signal level to the input jack and set the
REC LEVEL control to obtain the standard output signal level.
~ Record Mode --
AF OSC
LINE OUT
LINE OUT CN601 Pin @ (R-ch)
CN601 Pin @ (R-ch) Pin @ (R-ch)
Pin © (R-ch)
0 dB=0.775 V
e Standard Input Level
‘ LINE IN
Input level 0.25 V ( ~ 10 dB)
LINE OUT
7 (CN601 Pin@,@)
Output level 0.32 V ( — 7.7 dB)
e Standard Output Level
Output terminal
® Test tape
WS

TC-W421
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, — 10 dB)
PERE:
LINE OUT
2. Turn the adjustment screw for the maximum output levels. If these
levels do not match, turn the adjustment screw until both of output
levels match together within 1 dB.
within
R-CH
peak
screw
position
L-CH
R-CH
angle
peak
peak
3. Phase Check
Mode: Playback
test tape
P-4-A100
(10 kHz, ~ 10 dB)
L-CH
oscilloscope
LINE OUT
Screen pattern
in phase 45° 90° 135° 180°
Ry teal Nemnntiemnnmnyaarmnnnncmnnd
good ; wrong
4. After the adjustment, lock the screws with locking compound.
Adjustment Location: Record/Playback head
Adjustment | eee) (DECK A)
"NT
HRP901
(DECK
B)
Gi
a
SX
@ Press » (PLAY) button.
Tape Speed Adjustment
Procedure:
Mode: Playback
Perform high speed adjustment before normal speed adjustment.
test tape
WS-48B frequency counter
(3 kHz, 0 dB)
LINE OUT
(high speed adjustment)
1. Set to FWD playback mode.
2. Short test pin CN504 on Main board.
3. Adjust RV501 on main board so that the frequency counter reading
becomes 6,000 + 60 Hz.
4. After adjustment, disconnect CN504 shorted in step 2.
(normal speed adjustment)
1. Set to FWD playback mode.
2. Adjust RV502 on Main board so that the frequency counter reading
becomes 3,000 + 30 Hz.
Frequency difference between the begining and the end of the tape should
be within 5%.
Adjustment Location: main board (See Page 6.)

Playback Level Adjustment
Procedure:
Mode: Playback
test tape
P-4-L300
(315 kHz, 0 dB)
PERE
LINE OUT
Adjust RV101 (L-ch) and RV201 (R-ch) for DECK A and RV102 (L-ch)
and RV202 (R-ch) for DECK B so that the reading on VTVM meets the
adjustment limits below.
Adjustment Limits:
LINE OUT level: — 7.7 + 0.5 dB (0.30 — 0.34 V)
Level difference between channels: less than 0.5 dB
Check that the LINE OUT level does not change even if Playback and
Stop operation is repeated several times.
Adjustment Location: Main board (See Page 6.)
Record Bias Adjustment |DECK B
Starting:
REC LEVEL control: Standard Record (See page 3.)
Procedure:
1. Mode: Record
AF OSC
-
~~ attenuator 10kQ
+O0—O ©
600 Q
LINE IN
1) 315 Hz _
D oute } 24.5 mV (~ 30 dB)
CS-122
not record portion
2. Mode: Playback
recorded
portion
PERE
LINE OUT
3. Playback the signal recorded in step 1.
Confirm that the 10 kHz playback output is 0 + 0.5 dB relative to the 315
Hz output. If necessary, adjust RV403 (L-ch) and RV503 (R-ch) and
repeat the steps given above.
Adjustment Location: main board (See Page 6.)
TC-W421
Record Level Adjustment |DECK B
Starting:
REC LEVEL control: Standard Record (See page 3.)
Procedure:
1. Mode: Record
AF OSC
CS-122
C9 not record portion
~ attenuator 10 kQ
etlheo O00] ly set os
600 (2
LINE IN
315 Hz, 69.1 mV (— 21 dB)
2. Mode: Playback
recorded
portion
PET:
LINE OUT
3. Playback the signal recorded in step 1.
Confirm that signal level is within the adjustment limits below. If
necessary, adjust RV141 (L-ch) and RV241 (R-ch) and repeat the step 1 —
2.
Adjustment Limits: — 22.7 dB + 0.5 dB (53.6 — 60.2 mV)
Adjustment Location: main board (component side) (See Page 6.)

TC-W421
e Adjusting Parts Location
{MAIN BOARD] — Component Side —
TAPE SPEED
@ CN504
RV502
TAPE SPEED
NORMAL
+) RV101
PLAYBACK
LEVEL
(DECK A)
) RV201
€> RV141
RECORD
LEVEL
@> RV241
RV403 RV503
) RV102 RECORD
BIAS
PLAYBACK
LEVEL
(DECK B)
+) RV202

SECTION 3
DIAGRAMS
3-1. BLOCK DIAGRAM
[METER BOARD]
CN620 oo. [L
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t
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NOTE:
_@ -XX and -X mean standardized parts, so they
may have some difference from the original
one.
@® Color Indication
Example:
KNOB, BALANCE (WHITE)... (RED)
+ t
of Appearance Parts
Parts Color Cabinet’s Color
SECTION 4
EXPLODED VIEWS
@ Items marked “>” are not stocked since they
are seldom required for routine service. Some
delay: should be anticipated when ordering
these items.
@ The mechanical parts with no reference
number in the exploded views are not
supplied.
® Hardware (# mark) list is given in the last of
this parts list.
_ (1) FRONT PANEL AND CHASSIS SECTION
Ref. No.
10
12
Part No.
Description |
4-949-640-11 KNOB (DIA. 21)
A-4325-437-A LID (B) ASSY, CASSETTE (US)
A-4325-439-A LID (B) ASSY, CASSETTE (Canadian, E)
A-4325-436-A LID (A) ASSY, CASSETTE (US)
A-4325-438-A LID (A) ASSY, CASSETTE (Canadian, E)
3-7103-T10-41 STICKER, SONY SYMBOL (12)
A-2004-012-A PANEL ASSY, FRONT (US)
A-2004-013-A PANEL ASSY, FRONT (Canadian)
A-2004-014-A PANEL ASSY, FRONT (E)
4-949-639-01 BUTTON (BLOCK B)
4-949-638-01 BUTTON (BLOCK A)
4~928-635-21 SCREW, +BV (2. 6X10) TAPPING
3-375-844-01 BRACKET (CASE)
3-363-099-01 SCREW (CASE +3X8 TP2)
4-943-088-71 CASE
4-886-821-11 SCREW, S TIGHT, +PTTWH 3X6
—15-
Ref. No.
* 13
14
15
16
16
&
*
* 16
17
18
19
20
* 21
* 22
supplied
Part No. Description Remark
A-2006-717~A MAIN BOARD, COMPLETE
1-690-674-21 CORD (WITH CONNECTOR) (US)
1-690-672-11 CORD (WITH CONNECTOR) (US)
3-375-840-01 PANEL, BACK (US)
3-375-840-11 PANEL, BACK (Canadian)
3-375-840-21 PANEL, BACK (E)
X-4941-228-1 FOOT ASSY
1-590-243-11 WIRE, FLAT TYPE (21 CORE)
4-949-658-01 BUTTON (TC)
4-948-273-01 KNOB, SLIDE
1-642-591-11 METER BOARD
3-346-265-11 HOLDER, PC BOARD

(2) MECHANISM DECK (TCM-180VW-HS5)
51
#5
53
HP901
not #97
supplied \ Bee
72
HRP901 #9 238 Zz
NZ
SS
54 72-&s ‘<
71
g 2 ‘69°
not
supplied
53
51 52
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
51 3-358-209-01 SPRING (CASSETTE HOLDER), LEAF * 66 3-358-224-01 GEAR (FF GEAR)
52 3-358-266-02 HOLDER, CASSETTE 67 3-358-265-01 SLIDER (HEAD PC BOARD A)
53 3-371-917-01 SHAFT (BUTTON SHAFT 4) * 68 3-358-251-01 LEVER (TENSION DETECTION ARM)
54 3-369-335-01 LEVER (BUTTON BASE F) 69 3-358-228-01 SPRING, TORSION
55 X-3358-203-1 TABLE (T) ASSY, REEL * 70 3-358-215-01 BUSHING (WIRE KIT RETAINER)
* 56 3-358-284-01 GEAR (TU GEAR) 71 3-358-288-11 SCREW (T), AZIMUTH
*
57
3-358-252-01
LEVER
(TU
ARM)
72
3-358-288-01
SCREW
(T),
AZIMUTH
*
58
3-358~-253-01
LEVER
(SHUT-OFF
LEVER)
73
3~358-234-01
SPRING
(AZIMUTH),
COMPRESSION
59 3-358-243-01 SPRING (TU-SHUT), TORSION * 74 3-363-931-01 GUIDE, TAPE
60
3~358-248-01
GEAR
(SUPPLY
REEL)
HES01
1-543-673-11
HEAD,
MAGNETIC
(ERASE)
61
3-358-208-01
SPRING
(SUPPLY),
COMPRESSION
HP901
1-543-319-11
HEAD,
MAGNETIC
(REC/PB)
*
62
3-358-204-01
LEVER
(REC
SAFETY)
HRP901
1-543-319-11
HEAD,
MAGNETIC
(REC/PB)
63 X~3358-204-1 LEVER (PINCH LEVER) ASSY
64 3-578-143-11 PINCH ROLLER
65 3-358-207-01 SPRING (FF GEAR), COMPRESSION
—16—

(3) MECHANISM DECK (TCM-180VW-H5)
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
101 3-319-224-41 DAMPER, SMALL 115 3-701-437-01 WASHER
102 3-358-227-01 SPRING, LEAF 116 3-358-229-01 SPRING (LOADING), TORSION
103
3-358-286-01
LEVER
(MOTOR
LEVER)
*
117
3-358-226-01
LEVER
(PAUSE
LEVER)
* 104 1-640-702-11 LEAF SW (A) BOARD 118 3-358-260-0141 SLIDER (PAUSE)
105
4-928-635-01
SCREW,
+BV
(2.
6X8)
TAPPING
119
3-358-256-01
SLIDER
(STOP/EJECT)
106
3-358-214-01
SPRING
(LOCK),
TORSION
*
120
3-358-261-02
SLIDER
(HOLDER
LOCK)
107
3-358-258-01
SLIDER
(REW)
9F2_999_
_p
RB.
121 3~358-232-01 SPRING (S-P F-R), TORSION
*
108
3-358-249-01
SLIDER
(LOCK
PLATE)
122
3-358-257-01
SLIDER
(FF)
*
109
-%°3358-208-1
BRACKET
(B)
ASSY
|
123
3-358-233-01
SPRING
(REC-LOCK),
TORSION
124 3-358-255-01 LEVER (GB LEVER)
*
110 X-3358-202-1 LEVER (FR ARM) ASSY
re
st
Ae
a
i
*
125
1-640-703-11
LEAF
SW
(B)
BOARD
126
3+358-259-01
SLIDER
(REC)
113
-X°3358-205-1
FLYWHEEL
(A)
ASSY
127
X-3358-206-1
FLYWHEEL
(B)
ASSY
*
114
3~-358-289-01
SPACER
(VIBRATION
PROOF
MAT)
128
3-358-287-01
SPRING
(LOADING
A)
TORSION
M901 X-3362-377-1 MOTOR (WH) ASSY
oes ye

LEAF SW (A) SECTION 5
LEAF SW (B) ELECTRICAL PARTS LIST
NOTE:
@ Due to standardization, replacements in @ Items marked ”*” are not stocked since The components identified by
the parts list may be different from the they are seldom required for routine service. mark A\ or dotted line with mark.
parts specified in the diagrams or the Some delay should be anticipated A\ are critical for safety.
components used on the set. when ordering these items. Replace only with part number
@ -XX and -X mean standardized parts, so @ SEMICONDUCTORS specified.
they may have some difference from the ‘In each case, u:z4, for example:
original one. uA..: “A. uPA.: “PA. Les composants identifiés par une
@ RESISTORS uPB..: .PB.. uPC..: PC... uPD..: xePD.. marque A\ sont critiques pour
All resistors are in ohms. @ CAPACITORS la sécurité.
METAL: Metal-film resistor. uF: uF When indicating parts by reference Ne les remplacer que par une piéce
METAL OXIDE: Metal oxide-film resistor. @ COILS number, please include the board. portant le numéro spécifié.
F :nonflammable uH: .H
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
* 1-640-702-11 LEAF SW (A) BOARD ; C102 1-126-096-11 ELECT 10uF 20% 35V
Jeol doooioisio into C103 1-162-282-31 CERAMIC 100PF 10% 50V
C104 1-124-443-00 ELECT 100uF 20% 10V
< CAPACITOR > . C105 1-136-157-00 FILM 0.022uF 5% 50V
C0544 =1-164-159-11 CERAMIC 0. IMF 50V 0106 1-124-925-11 ELECT 2. 2uF 20% 100V
C107 1-162-281-31 CERAMIC 560PF 10% 50V
< CONNECTOR > C108 1-126-096-11 ELECT 10uF 20% 35V
C109 1-162-282-31 CERAMIC 100PF 10% 50V
* CN416 1-564-497-11 PIN, CONNECTOR 4P C110 1-124-443-00 ELECT 100uF 20% 10V
< SWITCH > C111 = 1-136-157-00 FILM 0.022uF 5% 50V
C112 = 1-124-257-00 ELECT 2. 2uF 20% 50V
54 1-571-736-11 SWITCH, LEAF C113 =1-161-377-00 CERAMIC 0.0047uF 20% 16V
$5 1-571-736-11 SWITCH, LEAF (114 1-162-289-31 CERAMIC 390PF 10% 50V
Ci15 1-124-927-11 ELECT 4. TuF 20% 100V
SOO Oo oioioioiokokoboboi iiookoiiotokoiiiok ik kokokoiokok kok loioloiok kok lokukogok dokokekok ok ake tek
C116 = 1-124-927-11 ELECT 4.7uF 20% 100V
* 1-640-703-11 LEAF SW (B) BOARD (121 1-124-925-11 ELECT 2. 2uF 20% 100V
Jeiotoloiaioioioi totoioiototiok C126 = =1-131-587-11 TANTALUM 0. 68uF 3% 35V
C127) = 1-124-925-11 ELECT 2. 2uF 20% 100V
< CONNECTOR > , (128 = =©1-124-925-11 ELECT 2. 2uF 20% 100V
* (N415 1-564-498-11 PIN, CONNECTOR SP 0141 1-136-173-00 FILM 0. 47uF 5% 50V
C142 1-124-927-11 ELECT 4, uF 20% 100V
< CAPACITOR > 0143 =1-124-443-00 ELECT 100uF 20% 10V
0144 1-124-907-11 ELECT 10uF 20% 50V
C545 1-164-159-11 CERAMIC © 0. IMF ~ 50V C145 1-162-284-31 CERAMIC 150PF 10% 50V
< SWITCH > C146 = =1-136-273-91 FILM 75PF Hy. 630V
C201 1-162-291-31 CERAMIC 560PF 10% 50V
Si: 1-571-736-11 SWITCH, LEAF €202 1-126-096-11 ELECT 10uF 20% 35V
82 1-571-736-11 SWITCH, LEAF (203 1-162-282-31 CERAMIC 100PF 10% 50V
533 1-571-736-11 SWITCH, LEAF (204 1-124-443-00 ELECT 100uF 20% 10V
FAI III II III I III ROR RoR ROO I TOR Bok tek 6205 1-136-157-00 FILM 0. 022uF 5% 50V
C208 1-124-925-11 ELECT 2. 2uF 20% 100V
* A-2006~-717-A MAIN BOARD, COMPLETE C207 = 1-162-291-31 CERAMIC 560PF 10% 50V
Helcioloiolsioioiotoioioioioioioioiotok (208 1-126-096-11 ELECT 10uF 20% 35V
(209 1-162-282-31 CERAMIC — 100PF 10% 50V
< CAPACITOR >
C210 = 1-124-443-00 ELECT 100uF 20% 10V
C101 1-162-291-31 CERAMIC o80PF 10% 50V — 211 1-136-157-00 FILM 0.022uF 5% 50V
= 138—

Ref. No.
se & & & &
6212
6213
¢214
6215
6216
6221
6226
C227
6228
6241
C242
6243
0244
0245
6246
C301
6302
6303
0322
6323
0341
C401
6402
6403
C404
¢405
C406
6407
0424
0442
6501
C502
6524
0533
0534
0542
C600
C602
C700
CN400
CN401
CN402
CN414
CNS04
CNSOS
CN601
Part No. Description Remark
1-124-925-11 ELECT 2. 2uF 20% 100V
1-161-377-00 CERAMIC 0.0047uF 20% 16V
1-162-289-31 CERAMIC 390PF 10% 50V
1-124-927-11 ELECT 4, Tuk 20% 100V
j-124-927-11 ELECT 4, TuF 20% 100V
1-124-925-11 ELECT 2. 2uF 20% 100V
1-131-587-11 TANTALUM -0. 68uF HY 35V
1-124-925-11 ELECT 2. 2uF 20% 100V
1-124-925-11 ELECT 2. 2uF 20% 100V °
1-136-173-00 FILM 0. 47uF oO 50V
1-124-927-11 ELECT 4. TuF 20% i00V
1-124-443-00 ELECT 100uF 20% 10V
1-124-907-11 ELECT 10uF 20% 50V
1-162-284-31 CERAMIC 150PF 10% S0V
1-136-273-91 FILM 75PF om 630V
1-124-478-11 ELECT 100uF 20% 25V
1-124-478-11 ELECT 100uF 20% 25V
1-124-925-11 ELECT 2. 2uF 20% 100V
1-126-176-11 ELECT 220uF 20% 10V
1-124-903-11 ELECT luF 20% SOV
1-124-907-11 ELECT 10uF 20% 50V
1-136-561-11 FILM 0. 0068uF 5% 630V
1-124-903-11 ELECT luF 20% 50V
1-130-482-00 MYLAR 0.0082uF 5% 50V
1-130-478-00 MYLAR 0.0039uF 5% 50V
1-130-478-00 MYLAR 0. 0039uF 5% 50V
1-124-902-00 ELECT 0. 47uF 20% 50V
1-124-925-11 ELECT 2. 2uF 20% 100V
1-162-280-31 CERAMIC 82PF 10% 50V
1-164-159-11 CERAMIC 0. luF 50V
1-124-927-11 ELECT 4. Tuk 20% 100V
1-124-925-11 ELECT 2. 2uF 20% 100V
1-162-280-31 CERAMIC 82PF 10% 50V
j-124-360-00 ELECT 1000uF 20% 16V
1-124-120-11 ELECT 220uF 20% 25V
1-164-159-11 CERAMIC 0. JuF 50V
1-124-907-11 ELECT 10uF 20% 50V
1-126-103-11 ELECT AT0uF 20% 16V
1-130-482-00 MYLAR 0. 0082uF 5% 50V
< CONNECTOR >
1-564-506-11 PLUG, CONNECTOR 3P
1-564-509-11 PLUG, CONNECTOR 6P
1-564-505-11 PLUG, CONNECTOR 2P
1-564-706-11 PIN, CONNECTOR (SMALL TYPE) 4P
1-564-505-11 PLUG, CONNECTOR 2P
'1-564~-505-11 PLUG, CONNECTOR 2P
1-565-949-11 SOCKET, CONNECTOR 9P
Ref. No.
CN610 1-568-838-11 SOCKET, CONNECTOR 21P
D401
D402
D501
D504
D505
- D506
D507
D510
D512
D606
D607
16301
16302
16303
16322
1341
10342
[C501
1502
L131
L231
Q101
Q121
Q141
Q201
Q221
Q241
Q321
Q401
Q402
0403
Q404
Q405
Q501
Q507
Q509
R101
Part No.
< DIODE >
8-719-912-20 DIODE
8-719-912-20 DIODE
8-719-912-20 DIODE
8-719-912-20 DIODE
8-719-912-20 DIODE
8-719-912-20 DIODE
8-719-912-20 DIODE
8-719-912-20 DIODE
8-719-912-20 DIODE
8-719-200-82 DIODE
8-718-200-82 DIODE
< IC >
8-759-800-36 IC
8-759-800-36 I¢
8-759-000-49 IC
8-752-057-19 I¢
8-752-038-02 IC
8-759-000-47 I¢
8-759-140-11 I¢
8-759-040-01 IC
< COIL >
1-410-780-11
1-410-780-11
Description
11ES2
LA3160
LA3160
MC14066BCP
CXA1101P
CXA1198AP
| TC-W421
Remark
18$120
185120
188120
188120
188120
188120
188120
188120
188120
11ES2
MC14051BCP
uPD4011BC
MC14001BCP
INDUCTOR 27mH
INDUCTOR 27mH
< TRANSISTOR >
8-729-900-89 TRANSISTOR
8-729-620-05 TRANSISTOR
8-729-620-05 TRANSISTOR
8-729-900-89 TRANSISTOR
8-729-620-05 TRANSISTOR
8-728-620-05 TRANSISTOR
8-729-900-89 TRANSISTOR
8-729-194-57 TRANSISTOR
8-728-194-57 TRANSISTOR
8-729-281-52 TRANSISTOR
8-729-900-61 TRANSISTOR
8-729-900-80 TRANSISTOR
8-729-119-76 TRANSISTOR
8-729-900-89 TRANSISTOR
8-729-900-65 TRANSISTOR
< RESISTOR >
1-247-889-00 CARBON
DTC144ES
28€2603-EF
28€2603-EF
DTC144ES
2802603-EF
28€2603-EF
DTIC144ES
280945~-P
280945-P
2801815-Y
DTAL14ES
DTCLI4ES
2SA1175-HFE
DTC144ES
DTA144ES
270K 5% 1/4W

TC-W421 |
Ref. No.
R102
R103
R104
R106
R107
R108
R109
R110
R111
R112
R113
R114
R121
R122
R129
R130
R131
R132
R133
R134
R135
R141
R142
R144
R145
R201
R202
R203
R204
R206
R207
R208
R203
R210
R211
R212
R213
R214
R221
R222
R229
R230
R231
R232
R233
R234
R235
R241
R242
Part No.
1-249-404-00 CARBON
1-247-882-11 CARBON
1-249-426-11 CARBON
1-247-889-00 CARBON
1-249-404-00 CARBON
1-247-882-11 CARBON
1-249-426-11 CARBON
1-249-430-11 CARBON
1-249-431-11 CARBON
1-247-887-00 CARBON
1-249-441-11 CARBON
1-249-441-11 CARBON |
1-249-435-11 CARBON
1-249-417-11 CARBON
1-249-421-11 CARBON
1-249-428-11 CARBON
1-249-417-11 CARBON
1-249-430-11 CARBON
1-249-425-11 CARBON
1-248-434-11 CARBON
1-247-848-11 CARBON
1-249-426-11 CARBON
1-249-421-11 CARBON
1-249-425-11 CARBON
1-249-430-11 CARBON
1-247-889-00 CARBON
1-249-404-00 CARBON
1-247-882-11 CARBON
1-249-426-11 CARBON
1-247-889-00 CARBON
1-249-404-00 CARBON
1-247-882-11 CARBON
1-249-426-11 CARBON
1-249-430-11 CARBON
1-249-431-11 CARBON
1-247-887-00 CARBON
1-249-441-11 CARBON
1-249-441-11 CARBON
1-249-435-11 CARBON
1-249-417-11 CARBON
1-249-421-11 CARBON
1-249-429-11 CARBON
1-249-417-11 CARBON
1-249-430-11 CARBON
1-249-425-11 CARBON
1-249-434-11 CARBON
1-247-848-11 CARBON
1-249-426-11 CARBON
1-249-421-11 CARBON
Description
82
130K
3. 6K
270K
82
130K
3. 6K
12K
15K
220K
100K
100K
33K
1K
2. 2K
10K
1K
12K
4. 7K
27K
5. 1K
5. 6K
2. 2K
4. 7K
12K
270K
82
130K
5. 6K
270K
82
130K
9. 6K
12K
15K
220K
100K
100K
33K
1K
2. 2K
10K
1K
12K
4. 7K
27K
5. 1K
9. 6K
2. 2K
5%
o%
o%
o%
o%
o%
0%
o%
o%
o%
o%
o%
3%
o%
o%
om
o%
o%
o%
o%
o%
3%
o%
3%
o%
o%
3%
3%
o%
0%
0%
3%
o%
0%
o%
o%
o%
o%
o%
om
om
o%
o%
3%
5%
3%
3%
o%
o%
Remark
1/4W
1/4
1/4W
1/4W
1/44
1/4W
1/4W
1/40
1/4W
1/4
1/4W
1/4W
1/4
1/4W
1/4
1/4W
1/4
1/4W
1/4
1/4W
1/4W
1/4W
1/4W
1/4W
1/4
1/4
1/4
1/4W
1/4W
1/4W
1/4
1/44
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/44
1/4W
1/44
1/4W-
1/4
1/4W
1/4W
Ref. No.
R244
R245
R301
R302
R321
R322
R323
R341
R342
R343
R345
R346
R347
R349
R351
R352
R393
R355
R357
R358
R359
R361
R363
R364
R365
R367
R369
R370
R371
R373
R375
R376
R377
R379
R381
R401
R402
R403
R404
R405
R406
R501
R502
R503
R506
R510
RO11
R512
R513
Part No.
1-249-425-11 CARBON
1-248-430-11 CARBON
1-260-091-11 CARBON
1-260-091-11 CARBON
1-249-433-11 CARBON
1-215-460-00 METAL
1-249-437-11 CARBON
1-249-441-11 CARBON
1-247-864-11 CARBON
1-247-887-00 CARBON
1-247-881-00 CARBON
1-249-440-11 CARBON
1-249-435-11 CARBON
1-249-438-11 CARBON
1-248-436-11 CARBON
1-247-874-11 CARBON
1-247-870-11 CARBON
1-249-440-11 CARBON
1-247-876-11 CARBON
1-249-437-11 CARBON
1-249-434-11 CARBON
1-247-881-00 CARBON
1-247-882-11 CARBON
1-247-872-11 CARBON
1-249-437-11 CARBON
1-249-438-11 CARBON
1-247-876-11 CARBON
1-249-437-11 CARBON
1-247-876-11 CARBON
1-249-441-11 CARBON
1-249-436-11 CARBON
1-247-881-00 CARBON
1-247-881-00 CARBON
1-249-437-11 CARBON
1-249-433-11 CARBON
1-248-393-11 CARBON
1-249-433-11 CARBON
1-249-433-11 CARBON
1-249-429-11 CARBON
1-249-417-11 CARBON
1-249-425-11 CARBON
1-249-426-11 CARBON
1-249-417-11 CARBON
1-249-426-11 CARBON
1-249-426-11 CARBON
1-249-427-11 CARBON
1-249-435-11 CARBON
1-249-439-11 CARBON
1-249-429-11 CARBON
Description
4. 7K
12K
220
220
22K
43K
47K
100K
24K
220K
120K
82K
33K
36K
39K
62K
43K
82K
75K
47K
27K
120K
130K
51K
47K
o6K
75K
47K
75K
100K
39K
120K
120K
47K
22K
10
22K
22K
10K
1K
4. 7K
5. 6K
1K
9. 6K
d. 6K
6. 8K
33K
68K
10K
3%
o%
3%
3%
o%
1%
3%
3%
3%
o%
o%
o%
o%
o%
o%
o%
o%
o%
3%
o%
om
3%
o%
3%
o%
o%
3%
3%
3%
o%
3%
3%
3%
0%
0%
om
3%
o%
a”
om
o%
o%
3%
3%
3%
5%
5%
5
5%
Remark
1/4W
1/4W
1/2W
1/2W
1/4W
1/6W
1/4W
1/4W
1/44
1/4¥
1/4
1/4W
1/4W
1/4
1/4W
1/4
1/4¥
1/4W
1/4W
1/4W
1/4W
1/40
1/4W
1/4
1/4W
1/4W
1/4
1/4W
1/4W
1/4
1/4W
1/4W
1/4W
1/4¥
1/4W
1/4W
1/4W
1/4W
1/4W
1/4
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W

Ref. No. Part No. Description Remark
R514 =: 1-249-441-11 CARBON 100K 5% 1/4W
R520
R545
R550
R75
R576
1-249-426-11 CARBON 3.6K 5%
1-249-437-11 CARBON ATK 5%
1-249-429-11 CARBON 10K 5%
1-249-441-11 CARBON 100K 5%
1-247-887-00 CARBON 220K 9%
1/48
1/40
1/4W
1/4W
1/4W
R703 1-249-421-11 CARBON
2.2K 5% 1/4W
< VARIABLE RESISTOR >
RV101
RV102
RVi41
RV201
RV202
1-238-600-11 RES, ADJ, CARBON 10K
1-238-600-11 RES, ADJ, CARBON 10K
1-238-600-11 RES, ADJ, CARBON 10K
1-238-600-11 RES, ADJ, CARBON 10K
1-238-600-11 RES, ADJ, CARBON 10K
RV241
RV403
RV501
RV502
RV503
1-238-600-11 RES, ADJ, CARBON 10K
1-238-604-11 RES, ADJ, CARBON 220K
1-238-598-11 RES, ADJ, CARBON 2. 2K
1-238-598-11 RES, ADJ, CARBON 2. 2K
1-238-604-11 RES, ADJ, CARBON 220K
< RELAY >
RY400 1-515-614-11 RELAY
< TRANSFORMER >
T500 1-433-394-11 TRANSFORMER, BIAS OSCILLATION
AEIIOISIOI I OI TOI OR OR IO IOI IR III IO IO IO FOI OI IO RII foto
* 1-642-591-11 METER BOARD
EI RI
< CAPACITOR >
¢191
C192
¢291
¢292
6391
1-124-925-11 ELECT
1-124-907-1411 ELECT
1-124-257-00 ELECT
1-126-096-11 ELECT
1-126-096-11 ELECT
2. 2uF 20% 100V
10uF 20% SOV
2. 2uF 20% SOV
10uF 20% 3oV
10uF 20% 3dV
TC-W421
Ref. No. Part No. Description Remark
D196 = 8-719- 304-32 LED SEL4214S-C
D291 8-719-304-32 LED SEL4214S-C
D292 8-719-304-32 LED SEL4214S-C
D293 = 8-719-304-32 LED SEL4214S-C
D294 =8-719-304-32 LED SEL42148-C
D295 = 8-719-304-32 LED SEL4214S-C
D296 8-719-304-32 LED SEL4214S-C
< I¢ >
10191 8-759-917-42 IC IJR2E31A
10291 8-759-917-42 IC IR2E31A
< RESISTOR >
Ri91 1-249-441-11 CARBON 100K 5% 1/4W
R192 1~249-405-11 CARBON 100» =5% 1/44
R291 1-249-441-11 CARBON 100K 5% 1/4W
R292 1-249-405-11 CARBON 100 «5% 1/4W
R391 1-249-414-11 CARBON 560 395% 1/4W
R408 1-247-852-11 CARBON 7.5K 5% 1/4W
R408 1-247-846-11 CARBON 4.3K 5% 1/4¥
R590 1-249-417-11 CARBON 1K 5% 1/4¥
< VARIABLE RESISTOR >
RV321 1-241-815-11 RES, VAR, CARBON 20K/20K (REC LEVEL)
< SWITCH >
§301 1-571-062-11 SWITCH, SLIDE (DECK B TAPE SELECTOR)
$302 1-692-060-11 SWITCH, LEVER(SLIDE) (DECK A TAPE SELECT)
§303 1-572-714-11 SWITCH, PUSH (DOLBY NR)
§501 1-572-714-11 SWITCH, PUSH (DUBBUNG SPEED)
So OO oo ok OOS GIO I I Ooi OK i i iaioiok kok ak fed toga
MISCELLANEOUS
Fel tototdqok tek
1-590-243-11 WIRE, FLAT TYPE (21 CORE)
1-690-672-11 CORD (WITH CONNECTOR) (US)
1-690-674-21 CORD (WITH CONNECTOR) (US)
¢590
* CN620
D191
D192
D193
D194
D195
1-124-903-11 ELECT
< CONNECTOR >
1-568-864-11 SOCKET, CONNEC
< DIODE >
8-719-304-32 LED SEL4214S-C
8-719-304-32 LED SEL4214S-C
8-719-304-32 LED SEL4214S-C
8-719-304-32 LED SEL42148-C
8-719-304-32. LED SEL4214S-C
luF
TOR 21P
20%
d0V
HE901 1-543-673-11 HEAD, MAGNETIC (ERASE)
HP901 1-543-319-11 HEAD, MAGNETIC (REC/PB)
HRPS01 1-543-319-11 HEAD, MAGNETIC (REC/PB)
M901 X~3362-377-1 MOTOR (WH) ASSY
Jodo SS So ASO OI SIO SIS IOS ROI SISOS IORI SRO ISO III III III
ACCESSORIES & PACKING MATERIALS
FOI SISO ISOS I IIT
* 3-375-945-01 CUSHION
* 3-376-136-01 CUSHION (HALF)
—21—

TC-W421 |
Ref. No. Part No. Description Remark
SSG IG Oo Oo lok ki ictoiokok doiotoiokokok sk tok sok gotetokok kkk tok
a of oe ok ae of ok ate feof oh fe he 2 2 ae fe ee ae a ak ak ake
HARDWARE LIST
AO ek kok ok kok kkk ok ok ok
#1 7-621-775-20 SCREW +B 2. 6X5
#2 7-623-921-01 RING, RETAINING, CAPSTAN
#3 7-682-548-04 SCREW +BVIT 3X8 (8)
#4 7-682-548-09 SCREW +BVIT 3X8 (S)
#5 7-685-103-19 SCREW +P 2X5 TYPE2 NON-SLIT
#6 7-685-133-19 SCREW +P 2. 6X6 TYPEZ
#7 7-685-135-19 SCREW +BTP 2. 6X10 TYPE2 N-S
#8 7-685-646-79 SCREW +BVTP 3X8 TYPE2 N-S
#9 7-688-001-01 W 2, SMALL
English
J 92D0542-1
Sony Corporation Printed in Japan
9-957-040-1141
Audio
Group
©
1992.
4
—22?~ Published by Customer Relations and Service Group

TC-W421
US Model
Canadian Model —
E Model
SONY.
SERVICE MANUAL
CORRECTION-1
Please correct your service manual.
<P"; Corrected portion
Incorrect
2-2. ELECTRICAL ADJUSTMENTS
2-2. ELECTRICAL ADJUSTMENTS
Note: The adjustment should be performed in the order given in the | Note: The adjustment should be performed in the order given in the
service manual. As a rule, adjustments about playback should be service manual. As a rule, adjustments about playback should be
performed before those about recording. The adjustments should be
performed for L-CH and R-CH.
Switches and controls should be set as follows unless otherwise
specified.
DOLBY NR switch: OFF
performed before those about recording. The adjustments should be
performed for L-CH and R-CH.
@ Switches and controls should be set as follows unless otherwise
specified.
DOLBY NR switch: OFF
TAPE SELECTOR switch: TYPE-1 (NORMAL)
Standard Record:
Deliver the standard input signal level to the input jack and set the
REC LEVEL control to obtain the standard output signal level.
Standard Record:
Deliver the standard input signal level to the input jack and set the
REC LEVEL control to obtain the standard output signal level.
Before recording short in CN505 with a lead wire, otherwise
MUTING function and output signal does not appear at LINE-OUT
terminals.
— Record Mode —
AF OSC
— Record Mode —
AF OSC
LINE OUT
CN601 Pin @ (R-ch)
Pin ® (R-ch)
LINE OUT
CN601 Pin @ (R-ch)
Pin © (R-ch)
LINE OUT , .
CN601 Pin @ (L-ch)
Pin © (R-ch)
LINE IN
CN601 Pin (D (L-ch)
Pin © (R-ch)
0 dB=0.775 V
e Standard Input Level
LINE OUT
(CN601 Pin@, ©)
Source impedance 10kQ
0.25 V (— 10dB)
0 dB=0.775 V
Input terminal
e Standard Input Level
Input
level
LINE
OUT
(CN601 Pin®, ©)
Source impedance 10kQ)
Input level 0.5 V (— 3.8 dB)
@ Standard Output Level
Input terminal
e Standard Output Level
LINE OUT
(CN6O1 Pin @, ®)
Load impedance
Output level 0.32 V (— 7.7 dB)
LINE OUT
(CN601 Pin@, @)
0.5 V(—3.8dB)
Output terminal
Load impedance
Output level

TC-W421
Page
Incorrect
Correct
@ Testtape
Type Used for
P-4-A 100
P-4-L300
WS-48A
10 kHz, — 10 dB
315 Hz, 0 dB
3 kHz, 0 dB
Azimuth adjustment
PB level adjustment
Tape speed adjustment
Record Bias Adjustment |DECK B
Starting:
REC LEVEL control: Standard Record (See page 3.)
Procedure:
1. Mode: Record
AF OSC
> attenuator 10 kQ0
+0O——O O
600 Q
LINE IN
1) 315 Hz _
D 10 whe } 24.5 mV (— 30 dB)
CS-122
not record portion
@ Test tape
P-4-L300 PB level adjustment
WS-48B Tape speed adjustment
Record Bias Adjustment |DECK B
Starting: ;
REC LEVEL control: Standard Record (See page 3.)
Procedure:
1. Mode: Record
AF OSC CS-123
- ~ blank TAPE
S attenuator {90 kQ
+O0—-7-0 ©
Broo ots cer Ho
600 Q
7 LINE IN y
1) 315 Hz _
Dio we } 50 mV (— 23.8 dB)
Record Level Adjustment |DECK B
Starting:
REC LEVEL control: Standard Record (See page 3.)
Procedure:
1. Mode: Record
AF OSC CS-122
C3 not record portion
% | attenuator 10kQ
OI
LINE IN
315 Hz, 69.1 mV (— 21 dB)
3. Playback the signal recorded in step 1.
2.
Adjustment Limits: — 22.7 dB + 0.5 dB (53.6 — 60.2 mV)
Adjustment Location: main board (component side) (See Page 6.)
RV502
NORMAL
+) Rvro1 & RV102
PLAYBACK
LEVEL PLAYBACK
L
6 (DECK A) (DECK B)
Confirm that signal level is within the adjustment limits below. If
necessary, adjust RV141 (L-ch) and RV241 (R-ch) and repeat the step 1 —
& RV201
& RV202
9-957-040-91
Sony Corporation
Audio Group
—?2—
Record Level Adjustment |DECK B
Starting:
REC LEVEL control: Standard Record (See page 3.)
Procedure:
1. Mode: Record
CS-123
blank TAPE
AF OSC
C3 attenuato
a |
“ r 10kQ
LINE IN
315 Hz, 50 mV ( — 23.8 dB)
3. Playback the signal recorded in step 1.
Confirm that signal level is within the adjustment limits below. If
necessary, adjust RV141 (L-ch) and RV241 (R-ch) and repeat the step 1 —
2.
Adjustment Limits: — 23.8 dB + 0.5 dB (47.2 — 53.0 mV)
Adjustment Location: main board (component side) (See Page 6.)
RV502
TAPE SPEED
NORMAL
& Avior 6) RV102
PLAYBACK
ee Pa
(DECK A) DECK B
CNS505 —_ | OEE 2
GD Aveor ES aveoe
English
92E0542-1
Printed in Japan
© 1992.5
Published by Customer Relations and Service Group