Mechanical Adjustments; Electrical Adjustments; Deck Section; Record/Playback Head Azimuth Adjustment - Sony HCD-V4800 Service Manual

SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
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 Torque Meter
Forward CQ-102C
Forward
CQ-102C
Back Tension
Reverse CQ-102RC
Reverse
CQ-102RC
Back Tension
FF, REW CQ-201B
• Tape Tension Measurement
Mode Tension Meter
Forward CQ-403A
Reverse CQ-403R
pinch roller
rubber belts
idlers
Meter Reading
36 to 61g•cm
(0.50 – 0.84 oz•inch)
2 to 6g•cm
(0.026 – 0.082 oz•inch)
36 to 61g•cm
(0.50 – 0.84 oz•inch)
2 to 6g•cm
(0.026 – 0.082 oz•inch)
61 to 143g•cm
(0.85 – 1.98 oz•inch)
Meter Reading
more than 100 g (3.53 oz)
more than 100 g (3.53 oz)
– 18 –
SECTION 5

ELECTRICAL ADJUSTMENTS

DECK SECTION

0 dB=0.775 V
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 otherwise
specified.
8. Set to test mode. (Press key switch same time
GROOVE ENTER/NEXT and DISC 4 buttons.)
To exit from the test mode, press the POWER button.
• Test Tape
Tape Signal
P-4-A100 10 kHz, –10 dB
WS-48B 3 kHz, 0 dB
P-4-L300 315 Hz, 0 dB

Record/Playback Head Azimuth Adjustment

DECK A DECK B
Note: Perform this adjustments for both decks.
Procedure:
1. Mode: Playback (FWD)
test tape
MAIN board
P-4-A100
CN207
(10 kHz, –10 dB) pin 3 (L-CH)
pin 1 (R-CH)
set
MAIN board
CN207
pin 2 (GND)
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.
within
L-CH
1 dB
peak
output
level
R-CH
peak
Screw
position
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
level meter
+
–
within
1 dB
Screw
position
L-CH
R-CH
peak peak