Sony TC-WE475 Service Manual ▷ View online
9
TC-WE475
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Procedure:
1. Forward Playback Mode
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.
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
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 –
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-
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-
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
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)
(test tape : WS-48B)
Playback Level Adjustment DECK A DECK B
Procedure:
– Forward Playback Mode –
– 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.
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.
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)
P-4-A100
(10 kHz, –10 dB)
level meter
LINE OUT
47 k
Ω
within
1 dB
1 dB
within
1 dB
1 dB
output
level
level
R-CH
peak
peak
R-CH
peak
peak
L-CH
peak
peak
L-CH
peak
peak
screw
position
position
screw position
V
H
Screen Pattern
set
In phase
45˚
90˚
135˚
180˚
good
wrong
47 k
Ω
47 k
Ω
L-CH
R-CH
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
LINE OUT
oscilloscope
forward side
reverse side
adjustment screws
set
frequency counter
47 k
Ω
LINE OUT
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
set
test tape
P-4-L300
(315 Hz, 0 dB)
P-4-L300
(315 Hz, 0 dB)
level meter
LINE OUT
47 k
Ω
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).
or the bias oscillator transformer (T141, T241).
Setting:
REC LEVEL knob : standard recording position (See page 11.)
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
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.)
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
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.)
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
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
CS-413
TP441
L-CH
R-CH
digital
voltmeter
voltmeter
LINE IN
no signal
no signal
set
AF OSC
attenuator
10 k
Ω
600
Ω
LINE IN
1) 315 Hz
2) 10 kHz
1) 315 Hz
2) 10 kHz
50 mV (–23.8 dBs)
blank tape
CS-123
CS-123
4. Playback Mode
set
recorded
portion
portion
level meter
LINE OUT
47 k
Ω
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.
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.
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
Ω
600
Ω
LINE IN
blank tape
CS-123
CS-123
315 Hz, 50 mV (–23.8 dBs)
set
recorded
portion
portion
level meter
LINE OUT
47 k
Ω
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.
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.)
11
TC-WE475
Adjustment Location: main board
RV111
PB LEVEL
DECK A (L)
RV211
PB LEVEL
DECK A (R)
RV318
PITCH
CONTROL
(DECK A)
RV317
NORMAL SPEED
(DECK A)
RV316
HIGH SPEED
(DECK A)
100
81
80
51
31
1
IC801
50
30
RV417
NORMAL
SPEED
(DECK B)
RV416
HIGH
SPEED
(DECK B)
RV241
REC BIAS
DECK B (R)
RV141
REC BIAS
DECK B (L)
RV201
REC
LEVEL (R)
REC
BIAS
T241
BIAS
CURRENT
DECK B (R)
BIAS CURRENT
DECK B (L)
T141
52
33
32
20
64
1
IC551
19
51
RV101
REC
LEVEL (L)
RV121
PB LEVEL
DECK B (L)
RV221
PB LEVEL
DECK B (R)
TP441
[MAIN board] (Component side)
12
TC-WE475
SECTION 6
DIAGRAMS
6-1. CIRCUIT BOARDS LOCATION
TRANS (A) board (
v
E)
(Except SP)
MAIN board
RECVOL board (
v
G)
H.P board (
v
D)
HEAD RELAY(REC/PB) board
(Deck B)
(Deck B)
HEAD RELAY(PB) board
(Deck A)
(Deck A)
LEAF SW (REC/PB) board
(Deck B)
(Deck B)
PANEL board (
v
A)
DIRECTION board (
v
C)
POWER board (
v
F)
LEAF SW (REC/PB) board
(Deck A)
(Deck A)
TRANS (B) board (
v
B)
•
vA to vG are including into the mounted PANEL board.
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