Mechanical Adjustments; Electrical Adjustments; Deck Section - Sony HCD-D390 - Compact Audio And Video System 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
demagnetizer.
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
supply 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 100g (3.52 oz)
more than 100g (3.52 oz)
— 18 —
SECTION 5

ELECTRICAL ADJUSTMENTS

DECK SECTION

0dB=0.775V
1. Demagnetize the record/playback head with a head
demagnetizer. (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
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
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 button.)
• Test Tape
Tape Signal
P-4-A100 10kHz, –10 dB
WS-48B 3kHz, 0dB
P-4-L300 315Hz, 0dB
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
test tape
P-4-A100
(10KHz, –10dB)
set
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
main board
CN207
Pin 1 (L-CH)
Pin 3 (R-CH) level meter
+
–
main board
CN207
Pin 2