Sony TCWE-675 Service manual
TC-WE675
SERVICE MANUAL
Ver 1.0 2001.04
Dolby noise reduction extension manufactured under license
from Dolby Laboratories Licensing Corporation.
HX Pro originated by Bang & Olufsen. “DOLBY”, the double-D
symbol ; and “HX PRO” are trademarks of Dolby Laboratories
Licensing Corporation.
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Model Name Using Similar Mechanism TC-WE635
Transport Mechanism Type TCM-230ASR41B
System
Fast-winding time
Approx.100 sec. (with Sony C-60 cassette)
Signal-to-noise ratio (at peak level and weighted with Dolby
NR off)
55 dB, using Sony TYPE I cassette
57 dB, using Sony TYPE II cassette
58 dB, using Sony TYPE IV cassette
S/N ratio improvement
With Dolby B NR on:
Approx. 5 dB at 1 kHz, 10 dB at 5 kHz
With Dolby C NR on:
Approx. 15 dB at 500 Hz, 20 dB at 1 kHz
Harmonic distortion
0.4% (using Sony TYPE Icassette):
160 nWb/m 315 Hz, 3rd H.D.)
1.8% (using Sony TYPE IV cassette):
250 nWb/m 315 Hz, 3rd H.D.)
Frequency response (DOLBY NR OFF)
30-16,000 Hz (±3 dB, IEC), 20-17,000 Hz
(±6 dB), using Sony TYPE I cassette
30-17,000 Hz (±3 dB, IEC), 20-18,000 Hz
(±6 dB), using Sony TYPE II cassette
30-19,000 Hz (±3 dB, IEC), 20-20,000 Hz
(±6 dB), 30-13,000 Hz (±3 dB, –4dB recording),
using Sony TYPE IV cassette
SPECIFICATIONS
Wow and flutter
±0.13% W. Peak (IEC)
0.1% W. RMS (NAB)
±0.2% W. Peak (DIN)
Variable pitch range
Approx. –30 to +30 %
Inputs
Line inputs (phono jacks)
sensitivity 0.16 V, input impedance 47 kilohms
Outputs
Line outputs (phono jacks)
rated output level 0.5 V at a load impedance of
47 kilohms, load impedance over 10 kilohms
Headphones (stereo phone jack)
output level 0.25 mW at a load impedance of
32 ohms
— Continued on next page —
9-873-894-11
2001D0900-1
© 2001. 4
STEREO CASSETTE DECK
Sony Corporation
Home Audio Company
Shinagawa Tec Service Manual Production Group
TC-WE675
General
Power requirements
U.S.A.and Canadian models:
120 V AC, 60Hz
European models:
230 V AC, 50/60Hz
Australian models:
240 V AC, 50/60Hz
Other models:
120/220/230-240 V AC, 50/60Hz
Adjustable with voltage selector
Power consumption
22 watts
Dimensions (w/h/d)
Approx. 430 × 120 × 300 mm
Mass 4.2 kg
Supplied accessories
Audio connecting cords (2)
Control A1II cable (1)*
*Supplied for Canadian models only
Design and specifications are subject to change
without notice.
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
0.15µF
1.5kΩ
Earth Ground
AC
voltmeter
(0.75V)
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMA TIC DIA GRAMS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
P ART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMA TIQ UES 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
TC-WE675
MODEL IDENTIFICATION
–Back panel–
P ARTS No. MODEL
4-232-414-0s US model
4-232-414-1s CND model
4-232-414-2s AEP model
4-232-414-3s UK model
4-232-414-4s SP model
4-232-414-5s AUS model
• Abbreviation
CND : Canadian model
SP : Singapore model
AUS : Australian model
Part No.
TABLE OF CONTENTS
1. GENERAL .......................................................................... 4
2. DISASSEMBLY
2-1. Case ......................................................................................5
2-2. Front Panel Assy ................................................................... 5
2-3. Cassette Lid Assy (Deck A/B) .............................................. 6
2-4. Mechanism Deck Assy (Deck A/B) ...................................... 6
3. SERVICE MODE .............................................................. 7
4. MECHANICAL ADJUSTMENTS................................. 8
5. ELECTRICAL ADJUSTMENTS ................................. 8
6. DIAGRAMS
6-1. Circuit Boards Location ...................................................... 12
6-2. Printed Wiring Board – MAIN Section – ........................... 14
6-3. Schematic Diagram – MAIN (1/4) Section – ..................... 15
6-4. Schematic Diagram – MAIN (2/4) Section – ..................... 16
6-5. Schematic Diagram – MAIN (3/4) Section – ..................... 17
6-6. Schematic Diagram – MAIN (4/4) Section – ..................... 18
6-7. Printed Wiring Board – DECK Section – ........................... 19
6-8. Schematic Diagram – DECK Section – .............................. 19
6-9. Schematic Diagram – LEAF SW Section – ........................ 20
6-10. Printed Wiring Board – LEAF SW Section – ...................21
6-11. Schematic Diagram – PANEL Section –...........................22
6-12. Printed Wiring Board – PANEL Section –........................23
6-13. Schematic Diagram – POWER Section – ......................... 24
6-14. Printed Wiring Board – POWER Section – ......................25
6-15. IC PIN FUNCTION .......................................................... 26
7. EXPLODED VIEWS
7-1. Case Section ........................................................................ 27
7-2. Chassis Section ...................................................................28
7-3. Cassette Holder Section ...................................................... 29
7-4. Front Panel Section ............................................................. 30
7-5. Tape Mechanism Section .................................................... 31
8. ELECTRICAL PARTS LIST ........................................ 32
3
TC-WE675
Front Panel
rs
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SECTION 1
GENERAL
1 2 3 4 5 6 7
wges wh
wdwle;
wa
8
9
0
qa
r;
Location of Parts and Controls
1 POWER 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
0 SYNCHRO button
qa PHONES jack
qs HIGH/NOMAL button
qd A+B REC button
qf DECK B button
qg DECK A button
qh (AMS) M (Deck B) button
qj m (AMS) (Deck B) button
qk H (Deck B) button
ql h (Deck B) button
w; REC z (Deck B) button
wa A (Eject) (Deck B) button
ekel ejeh
wfwjwk
eaed
ws w; qlqk qj qfqg qdqsqhegef
ws REC MUTING W (Deck B) button
wd PAUSE X (Deck B) button
wf x (Deck B) button
wg DOLBY NR B/C switch
wh DOLBY NR OFF/ON FILTER
wj H/FRONT (Deck A) button
wk h/BACK (Deck A) button
wl REC z (Deck A) button
e; REC MUTING W (Deck A) button
ea A (Eject) (Deck A) button
es PAUSE X (Deck A) button
ed x/CLEAR (Deck A) button
ef (AMS) M (Deck A) button RMS +
eg m (AMS) (Deck A) button RMS –
eh DISPLAY button
ej CHECK button
ek SET button
el RMS/START button
r; PITCH CONTROL knob
ra PITCH CONTROL button
rs DIRECTION switch
• AMS is the abbreviation for Automatic Music Sensor.
4
SECTION 2
DISASSEMBLY
• The equipment can be removed using the following procedure.
Set Case
Note : Follow the disassembly procedure in the numerical order given.
2-1. CASE
Front Panel Assy Cassette Lid Assy (Deck A/B) Mechanism Deck Assy (Deck A/B)
3
two screws
(case 3 TP2)
4
case
1
screw
(BVTT 3x6)
TC-WE675
2
two screws
(case 3 TP2)
2-2. FRONT PANEL ASSY
5
flat type wire
(Deck A)
qf
screw
(BVTP 3x8)
qj
claw
9
CN002
8
CN301
2
CN807
6
flat type wire
(Deck B)
1
CN5802
3
CN803
4
qh
claw
qg
two screws
(BVTT 3x6)
CNA806
0
(BVTP 3x8)
qa
wire
screw
7
CN401
qd
screw
(BVTP 3x8)
qk
qs
screw
(BVTP 3x8)
front panel assy
5
TC-WE675
2-3. CASSETTE LID ASSY (DECK A/B)
1
Push the EJECT button.
2
four claws
2-4. MECHANISM DECK ASSY (DECK A/B)
3
cassette lid assy
3
mechanism deck assy
1
two screws
(BVTP 2.6x8)
2
two screws
(BVTP 2.6x8)
6
TC-WE675
SECTION 3
SER VICE MODE
KEY CHECK & DISPLAY CHECK MODE
While pressing the h/BACK (A deck) and REC MUTING W (B deck) buttons with the po wer of f, press the PO WER b utton to turn on
the power.
The fluorescent display 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
RMS/START 2
SET 3
CHECK 4
DISPLAY 5
m (AMS) 6
(AMS) M 7
x/CLEAR Grid check display (*1)
n/BACK 8
N/FRONT 9
PAUSE X A
REC MUTING W b
REC z C
DIRECTION MODE switch
g h
s PLAY
RELAY H
B deck side
Button Display
RESET 0
MEMORY 1
DECK A 2
DECK B 3
A+B REC 4
HIGH/NOMAL 5
m (AMS) 6
(AMS) M 7
x Segment check display (*2)
h 8
H 9
PAUSE X A
REC MUTING W b
REC z C
FADER d
ARL E
SYNCHRO All lit
DOLBY NR switch (*3)
OFF h
B PLAY
C H
Grit check display (*1)
RMS
Segment check display (*2)
(*3) The DOLBY NR switch consists of a pair of switches.
B and C are valid only in the ON or ON FILTER state.
7
TC-WE675
r
SECTION 4
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 : g
• Standard record position :
Deliver the standard input signal le vel to input jack and set the
REC LEVEL knob to obtain the standard output signal level
as follows.
– Record Mode–
AF OSC
attenuator
Standard Input Level
Input terminal LINE IN
source impedance 10 kΩ
input signal level 0.5 V (–3.8 dBs)
Standard Output Level
Input terminal LINE IN
source impedance 10 kΩ
input signal level 0.5 V (–3.8 dBs)
10 kΩ
600 Ω
LINE IN
set
LINE OUT
level mete
47 kΩ
+
–
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 dBs = 0.775 V
Test Mode
1. While pressing the H/FRONT (DECK A) and REC MUT-
ING W buttons with the power of f, press the ! button to turn
on the power. The fluorescent 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 m (AMS) button after recording, stops at the point where
recording started.
2. To release the test mode, turn OFF the power switch.
8
TC-WE675
r
r
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Procedure:
1. Forward Playback Mode
test tape
P-4-A100
(10 kHz, –10 dB)
set
LINE OUT
level mete
47 kΩ
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 kΩ
oscilloscope
VH
Tape speed Adjustment DECK A DECK B
Adjust DECK A first
Procedure:
– Forward Playback Mode –
test tape
WS-48B
(3 kHz, 0 dB)
set
LINE OUT
47 kΩ
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 H 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 ± 80 Hz.
(Normal speed adjustment)
6. Press the H 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 H 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)
R-CH
In phase 45˚ 90˚ 135˚ 180˚
good wrong
47 kΩ
LINE OUT
Screen Pattern
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
level mete
47 kΩ
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 dBs ± 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.)
9
TC-WE675
e
r
e
r
Bias Consumption Current Adjustment
DECK A DECK B
This adjustment should be performed when replacing the head assy
or the bias oscillator transformer (T131, T231),(T141, T241).
Setting:
REC LEVEL knob : standard recording position (See page 11.)
Procedure:
digital
voltmeter
TP331 (DECK A)
TP441 (DECK B)
LINE IN
no signal
blank tape
CS-413
set
L-CHR-CH
321
1. Connect the digital voltmeter to test point TP331 (DECK A) and
TP441 (DECK B).
2. Set DECK A: RV131 (L-CH), RV231 (R-CH) and DECK B:
RV141 (L-CH), RV241 (R-CH) to mechanical center.
3. Press the H button to playback.
4. Adjust DECK A: T131 (L-CH), T231 (R-CH) and DECK B:
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 A 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 z button and then
press the H button to start recording.
AF OSC
blank tap
CS-123
attenuator
10 kΩ
600 Ω
LINE IN
1) 315 Hz
2) 10 kHz
set
50 mV (–23.8 dBs)
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.)
Record Level Adjustment DECK A 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 z button and then
press the H button to start recording.
3. Record Mode
AF OSC
10 kΩ
attenuator
set
600 Ω
LINE IN
315 Hz, 50 mV (–23.8 dBs)
blank tap
CS-123
4. Playback Mode
recorded
portion
set
LINE OUT
level mete
47 kΩ
5. Confirm playback the signal recorded in step 2 become adjustment level as follows.
If the selevels do not adjustment lev el, adjust the DECK A: R V102
(L-CH), RV202 (R-CH) and DECK B: RV101 (L-CH), RV201
(R-CH) to repeat steps 3 and 4.
Adjustment V alue:
LINE OUT level : –23.8 dBs ± 0.5 dB (47.2 to 53.0 mV)
Adjustment Location: MAIN board (See page 14.)
3. Record Mode
recorded
portion
set
LINE OUT
level mete
47 kΩ
4. Playback Mode
5. Confirm playback the signal recorded in step 2 become adjustment level as follows.
If the selevels do not adjustment level, adjust DECK A: RV131
(L-CH), R V231 (R-CH) and DECK B: RV141 (L-CH), RV241
(R-CH) to repeat steps 3 and 4.
10
Adjustment Location: main board
[MAIN board] (Component side)
TC-WE675
PB LEVEL
DECK A (L)
TP331
REC
BIAS
T131
BIAS CURRENT
DECK A (L)
RV131
REC BIAS
DECK A (L)
RV111
RV231
REC BIAS
DECK A (R)
RV211
PB LEVEL
DECK A (R)
T231
BIAS
CURRENT
DECK A (R)
RV318
PITCH
CONTROL
(DECK A)
RV317
NORMAL SPEED
(DECK A)
RV316
HIGH SPEED
(DECK A)
100
81
IC801
80
51
RV102
REC LEVEL
DECK A (L)
1
50
30
31
RV202
REC LEVEL
DECK A (R)
NORMAL
(DECK B)
RV417
SPEED
RV416
HIGH
SPEED
(DECK B)
RV101
REC
LEVEL (L)
33
32
20
51
IC551
19
RV121
PB LEVEL
DECK B (L)
52
64
1
BIAS CURRENT
RV141
REC BIAS
DECK B (L)
RV241
REC BIAS
DECK B (R)
RV221
PB LEVEL
DECK B (R)
RV201
LEVEL (R)
DECK B (L)
T141
REC
BIAS
T241
BIAS
CURRENT
DECK B (R)
REC
TP441
11
TC-WE675
)
6-1. CIRCUIT BOARDS LOCATION
LEAF SW (REC/PB) board
(Deck A)
SECTION 6
DIAGRAMS
TRANS (A) board (v E)
(Except SP)
TRANS (B) board (v B)
POWER board (
DIRECTION board (
v
F)
v
C)
HEAD RELAY (REC/PB) board
(Deck A)
PANEL board (
LEAF SW (REC/PB) board
(Deck B)
v
A)
• vA to vG are including into the mounted PANEL board.
H.P board (v D)
HEAD RELAY (REC/PB) board
(Deck B)
MAIN board
RECVOL board (
v
G
12
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