Mechanical Adjustments; Electrical Adjustments; Torque Measurement; Record/Playback Head Azimuth Adjustment - Sony HCD-V707 Service Manual

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MECHANICAL ADJUSTMENTS

3 7 63 1515 0
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head
erase head
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer.
3. Do not use a magnetized screwdriver for the adjustments.
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

Mode
Forward
Forward
Back Tension
Reverse
Reverse
Back Tension
FF, REW
• Tape Tension Measurement
Mode
TE
L 13942296513
Forward
Reverse
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SECTION 4
PRECAUTION
pinch roller
rubber belts
idlers
Torque Meter Meter Reading
36 to 61g•cm
CQ-102C
(0.50 – 0.84 oz•inch)
2 to 6g•cm
CQ-102C
(0.026 – 0.082 oz•inch)
36 to 61g•cm
CQ-102RC
(0.50 – 0.84 oz•inch)
2 to 6g•cm
CQ-102RC
(0.026 – 0.082 oz•inch)
61 to 143g•cm
CQ-201B
(0.85 – 1.98 oz•inch)
Tension Meter Meter Reading
CQ-403A more than 100 g (3.53 oz)
CQ-403R more than 100 g (3.53 oz)
x ao
y
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ELECTRICAL ADJUSTMENTS

8

DECK SECTION

1. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjust-
ment should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-ch.
7. Switches and controls should be set as follows unless other-
wise specified.
8. Set to test mode. (Press key switch same time
NEXT ENTER/NEXT and EFFECT ON/OFF buttons.)
• Test Tape
Tape
P-4-A100
WS-48B
P-4-L300

Record/Playback Head Azimuth Adjustment

DECK A
Q Q
Note: Perform this adjustments for both decks.
3 6 7 1 3
Procedure:
1. Mode: Playback (FWD)
test tape
P-4-A100
(10 kHz, –10 dB)
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– 19 –
SECTION 5
2 9 9 4 2 8
0 dB=0.775 V
Signal
10 kHz, –10 dB Azimuth Adjustment
3 kHz, 0 dB Tape Speed Adjustment
315 Hz, 0 dB Level Adjustment
DECK B
1 5 0 5 8 2 9 9 4
MAIN board
CN207
pin 3 (L-CH)
pin 1 (R-CH) level meter
set
+
–
MAIN board
CN207
pin 2 (GND)
m
co
9 9
Used for
2 8 9 9