Sony HCD-D690 Service Manual - Page 33

Deck A is RV311 L-CH and RV411 R-CH, Deck B is RV301 L, Record/Playback Head Deck A and B

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Page 33 highlights

1. Mode: Playback (FWD) 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 1dB of peak. L-CH peak within 1dB output level within 1dB Screw position R-CH peak L-CH R-CH peak peak Screw position 3. Mode: Playback (FWD) test tape P-4-A100 (10kHz, -10dB) L-CH main board CN207 set pin 1 pin 2 L R oscilloscope VH R-CH pin 3 waveform of oscilloscope in phase 45° 90° 135° 180° good wrong 4. Repeat steps 1 to 3 in playback (REV) mode. 5. After the adjustments, apply suitable locking compound to the pats adjusted. Adjustment Location: Record/Playback Head (Deck A and B) and main board. reverse forward Tape Speed Adjustment DECK A Note: Start the Tape Speed adjustment as below after setting to the test mode. In the test mode, the tape speed is high during pressing the H. SPEED DUBB button. Procedure: 1. Turn the power switch on. 2. Press the GROOVE button, ENTER/NEXT button and DISC 4 button simultaneously. To exit from the test mode, press the POWER button. Mode: Playback (FWD) test tape WS-48B (3 kHz, 0 dB) frequency counter set + - main board CN207 (Pin 1 : L-CH) (Pin 3 :R-CH) 1. Insert the WS-48B into the deck A and the blank tape into the deck B. 2. Press the REC button and · button on the deck B. Then the deck B is at recording mode. 3. Set the deck A to playback mode. 4. Keep pressing the H. SPEED DUBB button in playback mode. Then at HIGH speed mode. 5. Adjust RV652 on the AUDIO board do that frequency counter reads 6,000 ± 60 Hz. 6. Take off the H. SPEED DUBB button. Then at NORMAL speed mode. 7. Adjust RV651 on the AUDIO board so that frequency counter reads 3,000 + 30 - 10 Hz. 8. Frequency difference between deck A and deck B the begin- ning of the tape should be within ± 1.5%. Adjustment Location: AUDIO board Playback level Adjustment DECK A Procedure: Mode: Playback (FWD) DECK B test tape P-4-L300 (315 Hz, 0 dB) level meter set + - main board CN207 (Pin 1 : L-CH) (Pin 3 : R-CH) Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301 (LCH) and RV401 (R-CH) so that adjustment within adjustment level as follows. Adjustment Level: CN207 PB 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 and main boards - 33 -

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– 33 –
Screw
position
L-CH
peak
within
1dB
output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
3.
Mode:
Playback (FWD)
4.
Repeat steps 1 to 3 in playback (REV) mode.
5.
After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location:
Record/Playback Head (Deck A and B)
and main board.
reverse
forward
Tape Speed Adjustment
DECK
A
Note:
Start the Tape Speed adjustment as below after setting to
the test mode.
In the test mode, the tape speed is high during pressing the
H. SPEED DUBB
button.
Procedure:
1.
Turn the power switch on.
2.
Press the GROOVE button, ENTER/NEXT button and
DISC 4
button simultaneously.
To exit from the test mode, press the
POWER button.
Mode:
Playback (FWD)
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
main board
CN207 (Pin
1
: L-CH)
(Pin
3
:R-CH)
frequency counter
1.
Insert the WS-48B into the deck A and the blank tape into the
deck B.
2.
Press the
REC
button and
·
button on the deck B.
Then
the deck B is at recording mode.
3.
Set the deck A to playback mode.
4.
Keep pressing the
H. SPEED DUBB
button in playback mode.
Then at HIGH speed mode.
5.
Adjust RV652 on the AUDIO board do that frequency counter
reads 6,000 ± 60 Hz.
6.
Take off the
H. SPEED DUBB
button.
Then at NORMAL speed mode.
7.
Adjust RV651 on the AUDIO
board so that frequency counter
reads 3,000
Hz.
8.
Frequency difference between deck
A and deck B the begin-
ning of the tape should be within ± 1.5%.
Adjustment Location:
AUDIO board
Playback level Adjustment
DECK A
DECK B
Procedure:
Mode:
Playback (FWD)
+ 30
– 10
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
main board
CN207 (Pin
1
: L-CH)
(Pin
3
: R-CH)
level meter
main
board
CN207
set
test tape
P-4-A100
(10kHz, –10dB)
pin
3
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
pin
2
pin
1
L
R
1.
Mode:
Playback (FWD)
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 1dB of peak.
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301 (L-
CH) and RV401 (R-CH) so that adjustment within adjustment level
as follows.
Adjustment Level:
CN207 PB 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 and main boards