Sony TCWE-435 Service manual
TC-WE435
SERVICE MANUAL
Ver 1.1 2001. 05
Dolby noise reduction extension manufactured under license
from Dolby Laboratories Licensing Corporation.
HX Pro originated by Bang & Olufsen. “DOLBY”, the double-D
symbol a and “HX PRO” are trademarks of Dolby Laboratories
Licensing Corporation.
Model Name Using Similar Mechanism TC-WE425/WE525/WR681
Transport Mechanism Type
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
DECK A TCM-230ASR3/HSR3
DECK B TCM-230ASR4/HSR4
SPECIFICATIONS
— Continued on next page —
9-928-829 -12
2001E0200-1
© 2001.5
STEREO CASSETTE DECK
Sony Corporation
Personal Audio Company
Shinagawa Tec Service Manual Production Group
– 1 –
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for A C leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a V OM
or battery-operated A C v oltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PAR TS WHOSE
P AR T NUMBERS APPEAR AS SHO WN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
0.15µF
Ω
1.5k
Earth Ground
AC
voltmeter
(0.75V)
Fig. A. Using an AC voltmeter to check AC leakage.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES
DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
– 2 –
MODEL IDENTIFICATION
TABLE OF CONTENTS
–Back panel–
PARTS No. MODEL
3-032-413-0π US model
3-032-413-1π CND model
3-032-413-2π AEP model
3-032-413-3π UK model
3-032-413-4π AUS model
3-032-413-5π SP, MY model
3-032-413-6π CH model
• Abbreviation
CND : Canadian model
SP : Singapore model
MY : Malaysia model
AUS : Australian model
CH : Chinese model
Part No.
1. GENERAL .......................................................................... 4
2. DISASSEMBLY
2-1. Case ......................................................................................5
2-2. Front Panel Assembly ........................................................... 5
2-3. Cassette Lid Assembly (Deck A/B) ...................................... 6
2-4. Mechanism Deck Assembly (Deck A/B) .............................. 6
2-5. Leaf SW (PB) Board (Deck A),
Leaf SW (REC/PB) Board (Deck B) .................................... 7
2-6. Pinch Lever (FWD)/(REV) Assembly (Deck A/B) ............... 8
2-7. Flywheel (FWD)/(REV) Assembly (Deck A/B)................... 8
2-8. Mechanical Block Assembly (Deck A/B)............................. 9
2-9. Head Relay (PB) Board (Deck A),
Head Relay (REC/PB) Board (Deck B)................................ 9
3. SERVICE MODE ............................................................ 10
4. MECHANICAL ADJUSTMENTS............................... 11
5. ELECTRICAL ADJUSTMENTS ............................... 11
6. DIAGRAMS
6-1. Circuit Boards Location ...................................................... 15
6-2. Printed Wiring Board – Main Section –..............................17
6-3. Schematic Diagram – Main Section – (1/4) ........................ 19
6-4. Schematic Diagram – Main Section – (2/4) ........................ 21
6-5. Schematic Diagram – Main Section – (3/4) ........................ 23
6-6. Schematic Diagram – Main Section – (4/4) ........................ 25
6-7. Printed Wiring Board – Deck A Section – .......................... 27
6-8. Schematic Diagram – Deck A Section –............................. 27
6-9. Printed Wiring Board – Deck B Section – .......................... 28
6-10. Schematic Diagram – Deck B Section – ........................... 28
6-11. Schematic Diagram – Display Section –........................... 29
6-12. Printed Wiring Board – Display Section – ....................... 31
6-13. Schematic Diagram – Panel Section – .............................. 33
6-14. Printed Wiring Board – Panel Section – ........................... 35
6-15. Schematic Diagram – Power Section – ............................. 37
6-16. Printed Wiring Board – Power Section – ......................... 39
6-17. IC Pin Function ................................................................ 41
7. EXPLODED VIEWS
7-1. Case Section ........................................................................ 43
7-2. Chassis Section ................................................................... 44
7-3. Cassette Holder Section ...................................................... 45
7-4. Front Panel Section ............................................................. 46
7-5. Tape Mechanism Section
(Deck A: TCM-230ASR3/HSR3)
(Deck A: TCM-230ASR4/HSR4) ....................................... 47
8. ELECTRICAL PARTS LIST ........................................ 48
– 3 –
Front Panel
SECTION 1
GENERAL
135
31
30
28
LOCATION OF PARTS AND CONTROLS
1 U button
2 RESET (Deck A) button
3 MEMORY (Deck A) button
4 RESET (Deck B) button
5 MEMORY (Deck B) button
6 AUTO REC LEVEL indicator
7 REC LEVEL knob
8 FADER button
9 ARL button
10 SYNCHRO button
11 PHONES jack
12 HIGH/NOMAL button
13 (AMS) ) (Deck B) button
14 0 (AMS) (Deck B) button
15 · (Deck B) button
16 ª (Deck B) button
17 REC r button
24
252629
22
14
1516232427
18 § (Eject) (Deck B) button
19 REC MUTING R button
20 PAUSE P button
21 p (Deck B) button
22 DOLBY NR OFF B/C switch
23 · (Deck A) button
24 ª (Deck A) button
25 § (Eject) (Deck A) button
26 p (Deck A) button
27 (AMS) ) (Deck A) button
28 0 (AMS) (Deck A) button
29 PITCH CONTROL knob
30 PITCH CONTROL button
31 DIRECTION switch
• AMS is the abbreviation for Automatic Music Sensor.
13
7
6
8
9
10
11121718192021
– 4 –
SECTION 2
!™
Screw
(BVTP 3x8)
!¢
Screw
(BVTP 3x8)
!£
Screw
(BVTP 3x8)
!¶
Two screws
(BVTT 3x6)
!§
Claw
!∞
Claw
!•
Front panel assy
9
CN1002
0
CN1003
2
CN807
1
CN5802
3
CN803
4
CNA806
5
Flat type wire
(Deck A)
!¡
CN002
6
Flat type wire
(Deck B)
7
Screw
(BVTP 3x8)
8
Wire
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order giv en.
2-1. CASE
3
Two Screws
(Case 3 TP2)
4
Case
1
Screw
(BVTT 3x6)
2
Two Screws
(Case 3 TP2)
2-2. FRONT PANEL ASSEMBLY
– 5 –
2-3. CASSETTE LID ASSEMBLY (DECK A/B)
1
Push the EJECT button.
2
Four claws
3
Cassette lid assy
2-4. MECHANISM DECK ASSEMBLY (DECK A/B)
3
Mechanism deck assy
1
Two screws
(BVTP 2.6x8)
– 6 –
2
Two screws
(BVTP 2.6x8)
2-5. LEAF SW (PB) BOARD (DECK A), LEAF SW (REC/PB) BOARD (DECK B)
1
Two screws
(PS 2.6x6)
5
Screw
(BVTT 2x4)
7
LEAF SW (PB) board
(Deck A)
LEAF SW (REC/PB) board
(Deck B)
Claws
2
Capstan motor assy
4
Screw
(BVTT 2x4)
a
3
Wires
b
a
b
8
Belt (capstan)
When installing,
pull the belt (capstan)
put around claws.
6
Claws
– 7 –
2-6. PINCH LEVER (FWD)/(REV) ASSEMBLY (DECK A/B)
y
2
Pinch lever (REV) assy
1
Claw
4
Pinch lever (FWD) ass
3
Claw
2-7. FLYWHEEL (FWD)/(REV) ASSEMBLY (DECK A/B)
1
Belt (FR2)
6
Flywheel (REV) assy
7
Washer
3
Flywheel (FWD) assy
4
Washer
5
Stopper washer
– 8 –
2
Stopper washer
2-8. MECHANICAL BLOCK ASSEMBLY (DECK A/B)
(
)
3
Two screws
(BVTT 2x3.5)
4
Mechanical block assy
5
Reverse slider
2
Two screws
(BVTT 2x3.5)
1
Torsion spring
2-9. HEAD RELAY (PB) BOARD (DECK A), HEAD RELAY (REC/PB) BOARD (DECK B)
3
Tension spring (HEAD)
4
Head deck assy
2
HEAD RELAY (PB) board
(Deck A)
HEAD RELAY (REC/PB) board
(Deck B)
1
Screw
BVTT 2x4
– 9 –
SECTION 3
SER VICE MODE
KEY CHECK & DISPLAY CHECK MODE
While pressing the ª (A deck) and REC MUTING R buttons with the power off, press the U button to turn on the power.
The fluorescent indicator tube displays the number or special message corresponding to the button pressed.
The message displayed differs according to the position of the switch.
A deck side
Button Display
RESET 0
MEMORY 1
0 (AMS) 2
(AMS) ) 3
p Grid check display (*1)
ª 4
· 5
DIRECTION MODE switch
Aª
d PLAY
RELAY ·
B deck side
Button Display
RESET 0
MEMORY 1
HIGH/NOMAL 2
0 (AMS) 3
(AMS) ) 4
p Segment check display (*2)
ª 5
· 6
PAUSE P 7
REC MUTING R 8
REC r 9
FADER A
ARL b
SYNCHRO All lit
DOLBY NR switch
OFF ª
B PLAY
C ·
Grit check display (*1)
RMS
Segment check display (*2)
– 10 –
SECTION 4
set
–
+
AF OSC
attenuator
10 k
Ω
600
Ω
LINE IN
level meter
LINE OUT
47 k
Ω
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback/erase head pinch roller
rubber belts capstan
idlers
2. Demagnetize the record/playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustment.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power supply voltage unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
Forward
Forward
back
tension
Reverse CQ-102RC
Reverse
back
tension
FF/REW
CQ-102C
CQ-102C
CQ-102RC
CQ-201B
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
DECK A : 1 to 6 g • cm
(0.014 to 0.083 oz • inch)
DECK B : 2 to 9 g • cm
(0.028 to 0.125 oz • inch)
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
1 to 6 g • cm
(0.014 to 0.083 oz • inch)
70 to 120 g • cm
(0.97 to 1.67 oz • inch)
PRECAUTION
1. The adjustment should be performed in the publication.
(Be sure to male playback adjustment at first.)
2. The adjustments and measurement should be performed for both
L-CH and R-CH.
• Switch position
DOLBY NR switch : OFF
DIRECTION MODE switch : A
• Standard record position :
Deliver the standard input signal lev el to input jack and set the
REC LEVEL knob to obtain the standard output signal level
as follows.
– Record Mode–
Standard Input Level
Input terminal LINE IN
source impedance 10 kΩ
input signal level 0.5 V (–3.8 dB)
Standard Output Level
Input terminal LINE IN
source impedance 10 kΩ
input signal level 0.5 V (–3.8 dB)
Test T ape
Tape Contents Use
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB PB Level Adjustment
0 dB = 0.775 V
Test Mode
1. While pressing the · (DECK A) and REC MUTING R
buttons with the power off, press the U button to turn on the
power . The fluor escent display tube lights up for about one second, and the test mode is set. The test mode performs the following two special functions.
• Playback speed switching function
Pressing the HIGH/NORMAL button switches the playback
speed between standard/double speed.
• Counter RESET & MEMORY function
Resets the counter when recording starts. When rewound with
the 0 (AMS) button after recording, stops at the point where
recording started.
2. To release the test mode, turn OFF the power switch.
– 11 –
Record/Playback Head Azimuth Adjustment
r
r
DECK A DECK B
Procedure:
1. Forward Playback Mode
Tape speed Adjustment DECK A DECK B
Adjust DECK A first
Procedure:
– Forward Playback Mode –
test tape
P-4-A100
(10 kHz, –10 dB)
set
LINE OUT
47 k
level mete
Ω
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.
L-CH
peak
screw
position
R-CH
peak
output
level
1 dB
L-CH
peak
R-CH
peak
within
1 dB
screw position
within
3. Playback Mode
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
set
47 k
Ω
oscilloscope
VH
test tape
WS-48B
(3 kHz, 0 dB)
set
LINE OUT
47 k
Ω
frequency counter
(High speed adjustment)
1. Press the PITCH CONTROL button to set to OFF .
2. Set to test mode. (Refer to page 11.)
3. Press the · button to playback.
4. Press the HIGH/NORMAL button to playback at double speed.
5. Adjust RV316 (DECK A), RV416 (DECK B) so that the frequency counter reading becomes 5,980 ± 180 Hz.
(Normal speed adjustment)
6. Press the · button to playback.
7. Press the HIGH/NORMAL button to playback at normal speed.
8. Adjust RV317 (DECK A), RV417 (DECK B) so that the frequency counter reading becomes 3,000 ± 90 Hz.
(Pitch control adjustment) (DECK A)
9. Press the PITCH CONTROL button to set to ON .
10. Set PITCH CONTROL knob to mechanical center.
11. Press the · button to playback.
12. Adjust RV318 so that the frequency counter reading becomes
2,990 ± 90 Hz.
Adjustment Location: MAIN board (See page 14.)
Sample value of wow and flutter
W.RMS (JIS) less than 0.3% .
(test tape : WS-48B)
47 k
R-CH
Screen Pattern
In phase 45˚ 90˚ 135˚ 180˚
good wrong
Ω
LINE OUT
4. Change the reverse playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screws with suitable
locking compound.
Adjustment Location: – record/playback head –
forward sidereverse side
adjustment screws
Playback Level Adjustment DECK A DECK B
Procedure:
– Forward Playback Mode –
test tape
P-4-L300
(315 Hz, 0 dB)
set
LINE OUT
47 k
level mete
Ω
Adjust DECK A : RV111 (L-CH), RV211 (R-CH) and
DECK B : R V121 (L-CH), RV221 (R-CH) so the level meter reading becomes the adjustment limits below.
Adjustment V alue:
LINE OUT level : –7.7 ± 0.5 dB (0.301 to 0.338 V)
Level difference between channels : within 0.5 dB
Confirm that the LINE OUT level does not change in playback mode
while changing the mode from playback to stop several times.
Adjustment Location: MAIN board (See page 14.)
– 12 –
Bias Consumption Current Adjustment DECK B
r
r
This adjustment should be performed when replacing the head assy
or the bias oscillator transformer (T141, T241).
Setting:
REC LEVEL knob : standard recording position (See page 11.)
Procedure:
Record Level Adjustment DECK B
Setting:
REC LEVEL knob : standard record position (See page 11.)
Procedure:
1. Set to test mode (See page 11.)
2. Insert a tspe into deck B, press the REC r button and then
press the · button to start recording.
3. Record Mode
digital
voltmeter
TP441
LINE IN
no signal
blank tape
CS-413
set
L-CHR-CH
321
1. Connect the digital voltmeter to test point TP441.
2. Set RV141 (L-CH), RV241 (R-CH) to mechanical center.
3. Press the · button to playback.
4. Adjust T141 (L-CH), T241 (R-CH) so that the digital voltmeter
reading becomes minimum.
Adjustment V alue: Maximum 220 mV
Adjustment Location: MAIN board (See page 14.)
Record Bias Adjustment DECK B
Setting:
REC LEVEL knob : standard record position (See page 11.)
Procedure:
1. Set to test mode (See page 11.)
2. Insert a tape into deck B, press the REC r button and then
press the · button to start recording.
3. Record Mode
AF OSC
attenuator
10 k
Ω
set
600
Ω
LINE IN
315 Hz, 50 mV (–23.8 dB)
blank tape
CS-123
4. Playback Mode
recorded
portion
set
LINE OUT
47 k
level mete
Ω
5. Confirm playback the signal recorded in step 2 become adjustment level as follows.
If the selevels do not adjustment lev el, adjust the R V101 (L-CH)
and RV201 (R-CH) to repeat steps 3 and 4.
Adjustment V alue:
LINE OUT level : –23.8 ± 0.5 dB (47.2 to 53.0 mV)
Adjustment Location: MAIN board (See page 14.)
AF OSC
blank tape
CS-123
attenuator
10 k
600
Ω
LINE IN
1) 315 Hz
2) 10 kHz
Ω
set
50 mV (–23.8 dB)
4. Playback Mode
recorded
portion
set
LINE OUT
47 k
level mete
Ω
5. Confirm playback the signal recorded in step 2 become adjustment level as follows.
If the selevels do not adjustment le vel, adjust the R V141 (L-CH)
and RV241 (R-CH) to repeat steps 3 and 4.
Adjustment level:
The palyback output of 10 kHz level difference against 315 Hz reference should be ± 0.5 dB.
Adjustment Location: MAIN board (See page 14.)
– 13 –
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