Sony HCD-GR5 Service Manual page 12

Procedure:
1. Mode : Playback
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw so
that outputs match within 1 dB of peak.
L-CH
peak output
within
level
1dB
R-CH
peak
screw
position
3. Mode: Playback
test tape
main board
P-4-A100
CN403
(10kHz, –10dB)
Pin 3 (L-CH)
L
set
R
Pin 1 (R-CH)
Waveform of oscilloscope
in phase
45˚
good
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
FWD side
Adjustment screw
within 1dB
screw
L-CH
R-CH
position
peak peak
oscilloscope
Pin 2 (GND)
90˚ 135˚ 180˚
wrong
REV side
Tape Speed Adjustment (Deck A)
Note: Start the Tape Speed adjustment as below after setting the
test mode.
The tape speed can be changed with the HIGH SPEED
DUBBING button during the test mode.
Method :
1. Turn the power switch on.
2. Press the DISPLAY button, MENU 1 button and TUNER/
BAND button simultaneously.
Procedure :
Mode: Playback
test tape WS-48B
(3kHz, 0dB)
1. Insert the WS-48B into the deck A to playback.
2. Press the HIGH SPEED DUBBING button. Then at HIGH
SPEED mode.
3. Adjust the RV652 on the AUDIO board so that the frequency
counter reading becomes 6,000 ± 90 Hz.
4. Press the HIGH SPEED DUBBING button again to be set the
NORMAL SPEED mode.
5. Set to the playback mode.
6. Adjust the RV651 on the AUDIO board so that the frequency
counter reading becomes 3,000 ± 90 Hz.
Frequency difference between deck A and deck B the beginning
of the tape should be within ± 1.5%.
Adjustment Location: AUDIO board
Playback Level Adjustment (Deck A, Deck B)
Procedure:
Mode: Playback
test tape P-4-L300
(315Hz, 0dB)
set
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Adjustment level:
CN403 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
— 12 —
frequency counter
+
set
–
MAIN board
CN403 Pin 3 (L-CH)
Pin 1 (R-CH)
level meter
MAIN board
CN403 Pin 3 (L-CH)
Pin 1 (R-CH)