Section 3. Mechanical Adjustments; Section 4. Electrical Adjustments; Deck Section - Sony HCD-D670AV - Compact Disk Deck Receiver Service Manual

SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback heads
erase head
capstan
2. Demagnetize the record/playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power supply
voltage unless otherwise noted.
Torque Measurement
Torque meter
Torque
FWD CQ-102C
FWD
CQ-102C
back tension
REV
CQ-102RC
REV
CQ-102RC
back tension
FF/REW
CQ-201B
FWD tension
CQ-403A
REV tension
CQ-403R
pinch rollers
rubber belts
idlers
Meter reading
36 to 61g • cm
(0.5–0.84 oz • inch)
2 to 6g • cm
(0.02–0.08 oz • inch)
36 to 61g • cm
(0.5–0.84 oz • inch)
2 to 6g • cm
(0.02–0.08 oz • inch)
61 to 143g • cm
(0.85–1.99 oz • inch)
100g or more
(3.53 oz or more)
100g or more
(3.53 oz or more)
— 11 —
SECTION 4
ELECTRICAL ADJUSTMENTS

DECK SECTION

0 dB=0.775V
1. Demagnetize the record/playback head with a head damagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustmetns 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.
DOLBY NR switch : OFF (US, CND, AEP, UK, G, IT model)
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
CN403
(10kHz, –10dB)
Pin 3 (L-CH)
Pin 1 (R-CH)
set
main board
CN403
Pin 2
• Abbreviation
CND : Canadian model.
G : German model.
IT : Italian model.
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
level meter