Sony TC-WE825S Service Manual page 10

Record/Playback Head Azimuth Adjustment
Procedure:
1. Forward Playback Mode
test tape
P-4-A100
(10 kHz, –10 dB)
set
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.
within
output
L-CH
1 dB
level
peak
R-CH
peak
screw
L-CH
position
peak
3. Playback Mode
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
set
R-CH
Screen Pattern
In phase 45˚
good
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 side
adjustment screws
DECK A DECK B
level meter
47 k Ω
+
–
LINE OUT
within
1 dB
screw position
R-CH
peak
oscilloscope
47 k Ω
V H
+ +
– –
47 k Ω
LINE OUT
90˚ 135˚ 180˚
wrong
reverse side
Tape Speed Adjustment
Procedure:
–Forward Playback Mode–
test tape
WS-48B
(3 kHz, 0 dB)
set
(High speed adjustment)
1. Set to test mode. (Refer to page 8.)
2. Set to FWD playback mode.
3. Twice pressing the HIGH/NORMAL switch.
4. Adjust RV72 so that the frequency counter reading becomes
6,000 ± 20 Hz.
5. Release test mode after adjustment is completed.
(Normal speed adjustment)
1. Set to FWD playback mode.
2. Adjust RV71 so that the frequency counter reading becomes
3,000 ± 10 Hz.
(Pitch control adjustment) (TC-WE725/WE825S only)
1. Push the PITCH CONTROL switch.
2. Set RV902 to mechanical center.
3. Set to FWD playback mode.
4. Adjust RV601 so that the frequency counter reading becomes
3,000 ± 10 Hz.
Frequency difference between the beginning and the end of the tape
should be within ± 3%.
Frequency difference between the deck A and deck B the beginning
of the tape should be within ± 1.5%.
Adjustment Location: AUDIO board, MAIN board
Playback Level Adjustment
Procedure:
–Forward Playback Mode–
test tape
P-4-L300
(315 Hz, 0 dB)
Adjust RV11 (L-CH) and RV21 (R-CH) so the level meter reading
becomes the adjustment limits below.
Adjustment Value:
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: AUDIO board (See page 11.)
– 9 –
DECK A DECK B
frequency counter
47 k Ω
+
–
LINE OUT
(See page 11.)
DECK A DECK B
level meter
47 k Ω
+
set
–
LINE OUT