Mechanical Adjustments; Electrical Adjustments Deck Section - Sony HCD-N455KW Service Manual

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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. 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
Torque
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
TE
L 13942296513
REV tension
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SECTION 4
pinch rollers
rubber belts
idlers
Torque meter
Meter reading
36 to 61 g • cm
CQ-102C
(0.5 - 0.84 oz • inch)
2 to 6 g • cm
CQ-102C
(0.02 - 0.08 oz • inch)
36 to 61 g • cm
CQ-102RC
(0.5 - 0.84 oz • inch)
2 to 6 g • cm
CQ-102RC
(0.02 - 0.08 oz • inch)
61 to 143 g • cm
CQ-201B
(0.85 - 1.99 oz • inch)
100 g or more
CQ-403A
(3.53 oz or more)
100 g or more
CQ-403R
(3.53 oz or more)
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8
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 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 adjustment
should be completed before performing recording circuit adjust-
ment.)
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.
Tape
P-4-A100
WS-48B
P-4-L300
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
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3 6 7 1 3
Procedure:
1. Mode : Playback
test tape
P-4-A100
(10kHz, –10dB)
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— 9 —
2 9 9 4 2 8
SECTION 5
0 dB=0.775V
Signal
Azimuth Adjustment
10 kHz, –10 dB
3 kHz, 0 dB Tape Speed Adjustment
315 Hz, 0 dB
1 5 0 5 8 2 9 9 4
main board
CN403
level meter
Pin 3 (L-CH)
Pin 1 (R-CH)
set
main board
CN403
Pin 2 (GND)
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co
9 9
Used for
Level Adjustment
2 8 9 9
+
–