Sony TC-WE625 / TC-WE725 / TC-WE825S / TC-WE835S Service Manual ▷ View online
– 5 –
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
CASE
Unscrew the five case attachment screws M3
Unscrew the five case attachment screws M3
×
8 and remove
the case.
2-1. FRONT PANEL ASSY
1
BVTP 3x8
2
lug plate
3
CNA807
1
BVTP 3x8
2
power voltage selector
4
CNS802
5
CNA801 (US, Canadian)
6
CNA803
7
CNA806
8
CN51
0
CN002
!¡
CNP73
!¢
claw
!§
CN501, 502
!™
BVTP 3x6
!∞
claw
!¶
CN503, 504
!£
BVTP 3x8
!•
front panel assy
9
CN51
(WE725/WE825S)
5
BVTP 2.6x8
4
BVTP 2.6x8
6
mechanism deck
3
cassette lid
2
claws
2-2. MECHANISM DECK
1
Press the EJECT button.
POWER VOLTAGE SELECTOR
1
-
2
(Singapore, Malaysia)
FRONT PANEL ASSY
1
-
!¶
– 6 –
2-3. FITTING BASE
2-4. CAPSTAN MOTOR, REEL MOTOR
4
PTPWH 2x23
3
connector
7
gear (trigger)
5
claws
6
fitting base
1
Pull the capstan belt
and put around claws.
2
Pull the square belt
and put around claws.
0
reel motor
5
claws
6
AUDIO board
2
connector
4
claw
3
connector
1
square belt
9
P 2.6x2.8
7
B 2.6x3
8
capstan motor
!¡
ground plate
– 7 –
2-5. HEAD DECK ASSY
5
torsion spring
3
claw
1
claw
6
claw
7
head deck assy
2
lever (pinch F) assy
4
lever (pinch R) assy
– 8 –
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
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
CQ-102C
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
DECK A : 1 to 6 g • cm
Forward
(0.014 to 0.083 oz • inch)
back
CQ-102C
tension
DECK B : 2 to 9 g • cm
(0.028 to 0.125 oz • inch)
Reverse
CQ-102RC
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
Reverse
1 to 6 g • cm
back
CQ-102RC
(0.014 to 0.083 oz • inch)
tension
FF/REW
CQ-201B
70 to 120 g • cm
(0.97 to 1.67 oz • inch)
SECTION 4
ELECTRICAL ADJUSTMENTS
SECTION 3
MECHANICAL ADJUSTMENTS
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
• Switch position
DOLBY NR switch
: OFF
DIRECTION MODE switch :
A
• Standard record position :
Deliver the standard input signal level to input jack and set
the REC LEVEL control to obtain the standard output signal
level as follows.
the REC LEVEL control to obtain the standard output signal
level as follows.
– Record Mode–
0 dB = 0.775 V
Standard Input Level
Input terminal
LINE IN
source impedance
10 k
Ω
input signal level
0.5 V (–3.8 dB)
Standard Output Level
Output terminal
LINE OUT
load impedance
47 k
Ω
output signal level
0.5 V (–3.8 dB)
Test Tape
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
set
–
+
AF OSC
attenuator
10 k
Ω
600
Ω
LINE IN
level meter
LINE OUT
47 k
Ω
Test Mode
1. Turn ON power switch pressing “REC MUTING” switch of deck
A and B at the same time.
At first, all the fluorescent indicator light up, then the system
returns to normal display. (However, “0. 00” is not displayed on
the counter.)
At first, all the fluorescent indicator light up, then the system
returns to normal display. (However, “0. 00” is not displayed on
the counter.)
2. To release the test mode, turn OFF the power switch.
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