Section 3. Mechanical Adjustments; Section 4. Electrical Adjustments; Deck Section - Panasonic HCD-D670AV Service Manual

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MECHANICAL ADJUSTMENTS
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
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
TE
L 13942296513
REV tension
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SECTION 3
PRECAUTION
pinch rollers
rubber belts
idlers
Torque meter
Meter reading
36 to 61g • cm
CQ-102C
(0.5–0.84 oz • inch)
2 to 6g • cm
CQ-102C
(0.02–0.08 oz • inch)
36 to 61g • cm
CQ-102RC
(0.5–0.84 oz • inch)
2 to 6g • cm
CQ-102RC
(0.02–0.08 oz • inch)
61 to 143g • cm
CQ-201B
(0.85–1.99 oz • inch)
100g or more
CQ-403A
(3.53 oz or more)
100g or more
CQ-403R
(3.53 oz or more)
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ELECTRICAL ADJUSTMENTS

DECK SECTION

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
P-4-A100
WS-48B
P-4-L300
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Q Q
3 6 7 1 3 1 5
Note : Perform this adjustments for both decks.
Procedure :
1. Mode : Playback (FWD)
test tape
P-4-A100
(10kHz, –10dB)
• Abbreviation
CND : Canadian model.
G : German model.
IT : Italian model.
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SECTION 4
0 dB=0.775V
Signal Used for
10 kHz, –10 dB Azimuth Adjustment
3 kHz, 0 dB Tape Speed Adjustment
315 Hz, 0 dB Level Adjustment
0 5 8 2 9 9 4 2 8
main board
CN403
level meter
Pin 3 (L-CH)
Pin 1 (R-CH)
set
main board
CN403
Pin 2
m
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