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Model
TC-WE475
Pages
38
Size
3.72 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
tc-we475.pdf
Date

Sony TC-WE475 Service Manual ▷ View online

7
TC-WE475
RESET
0
MEMORY
1
m (AMS)
2
(AMS) M
3
x
Grid check display (*1)
h
4
H
5
DIRECTION MODE switch
g
h
s
PLAY
RELAY
H
A deck side
Button
Display
KEY CHECK & DISPLAY CHECK MODE
While pressing the  h (A deck)  and  REC MUTING  W  buttons with the power off, press the  POWER  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.
SECTION 3
SERVICE MODE
RESET
0
MEMORY
1
HIGH/NOMAL
2
m (AMS)
3
(AMS) M
4
x
Segment check display (*2)
h
5
H
6
PAUSE X
7
REC MUTING W
8
REC z
9
FADER
A
ARL
b
SYNCHRO
All lit
DOLBY NR switch
OFF
h
B
PLAY
C
H
B deck side
Button
Display
Grit check display (*1)
Segment check display (*2)
RMS
8
TC-WE475
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 demagne-
tizer.
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 sup-
ply voltage unless otherwise noted.
Torque Measurement
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
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
DOLBY NR switch
: OFF
DIRECTION MODE switch : g
• Standard record position :
Deliver the standard input signal level to input jack and set the
REC LEVEL  knob to obtain the standard output signal level
as follows.
– Record Mode–
 0 dBs = 0.775 V
Standard Input Level
Test Mode
1. While pressing the  H (DECK A)  and  REC MUTING W
buttons with the power off, press the  !  button to turn on the
power. The fluorescent display tube lights up for about one sec-
ond, and the test mode is set. The test mode performs the fol-
lowing 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.
Mode
Torque meter
Meter reading
Forward
CQ-102C
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
Forward
back
tension
CQ-102C
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)
Reverse
CQ-102RC
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
Reverse
back
tension
CQ-102RC
1 to 6 g • cm
(0.014 to 0.083 oz • inch)
FF/REW
CQ-201B
70 to 120 g • cm
(0.97 to 1.67 oz • inch)
set
+
AF OSC
attenuator
10 k
600 
LINE IN
level meter
LINE OUT
47 k
Standard Output Level
Test Tape
Input terminal
LINE IN
source impedance
10 k
input signal level
0.5 V (–3.8 dBs)
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
Input terminal
LINE IN
source impedance
10 k
input signal level
0.5 V (–3.8 dBs)
9
TC-WE475
Record/Playback Head Azimuth Adjustment
DECK A    DECK B
Procedure:
1. Forward Playback Mode
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.
3. Playback Mode
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 –
Tape speed Adjustment
  DECK A    DECK B
Adjust DECK A first
Procedure:
– Forward Playback Mode –
(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 fre-
quency counter reading becomes 5,980 ± 180 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 fre-
quency 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)
Playback Level Adjustment     DECK A    DECK B
Procedure:
– Forward Playback Mode –
Adjust DECK A : RV111 (L-CH), RV211 (R-CH) and
DECK B : RV121 (L-CH), RV221 (R-CH) so the level meter read-
ing becomes the adjustment limits below.
Adjustment Value:
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.)
set
test tape
P-4-A100
(10 kHz, –10 dB)
level meter
LINE OUT
47 k
within
1 dB
within
1 dB
output
level
R-CH
peak
R-CH
peak
L-CH
peak
L-CH
peak
screw
position
screw position
V
H
Screen Pattern
set
In phase
45˚
90˚
135˚
180˚
good
wrong
47 k
47 k
L-CH
R-CH
test tape
P-4-A100
(10 kHz, –10 dB)
LINE OUT
oscilloscope
forward side
reverse side
adjustment screws
set
frequency counter
47 k
LINE OUT
test tape
WS-48B
(3 kHz, 0 dB)
set
test tape
P-4-L300
(315 Hz, 0 dB)
level meter
LINE OUT
47 k
10
TC-WE475
Bias Consumption Current Adjustment     DECK B
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:
1. Connect the digital voltmeter to test point TP441.
2. Set RV141 (L-CH), RV241 (R-CH) to mechanical center.
3. Press the  H  button to playback.
4. Adjust T141 (L-CH), T241 (R-CH) so that the digital voltmeter
reading becomes minimum.
Adjustment Value: 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 z  button and then
press the  H  button to start recording.
3. Record Mode
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 z  button and then
press the  H  button to start recording.
3. Record Mode
4. Playback Mode
set
3
2
1
blank tape
CS-413
TP441
L-CH
R-CH
digital
voltmeter
LINE IN
no signal
set
AF OSC
attenuator
10 k
600 
LINE IN
1) 315 Hz
2) 10 kHz
50 mV (–23.8 dBs)
blank tape
CS-123
4. Playback Mode
set
recorded
portion
level meter
LINE OUT
47 k
5. Confirm playback the signal recorded in step 2 become adjust-
ment level as follows.
If the selevels do not adjustment level, adjust the RV141 (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 ref-
erence should be ± 0.5 dB.
Adjustment Location: MAIN board (See page 14.)
set
AF OSC
attenuator
10 k
600 
LINE IN
blank tape
CS-123
315 Hz, 50 mV (–23.8 dBs)
set
recorded
portion
level meter
LINE OUT
47 k
5. Confirm playback the signal recorded in step 2 become adjust-
ment level as follows.
If the selevels do not adjustment level, adjust the RV101 (L-CH)
and RV201 (R-CH) to repeat steps 3 and 4.
Adjustment Value:
LINE OUT level : –23.8 dBs ± 0.5 dB (47.2 to 53.0 mV)
Adjustment Location: MAIN board (See page 14.)
Page of 38
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