Sony HCD-W55 - Adjustments; Mechanical Adjustments; Electrical Adjustments

– 6 –
SECTION 3
ADJUSTMENTS
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Torque Measurement
Mode Torque Meter Meter Reading
Forward CQ-102C
36 to 61 g
•
cm
(0.50 – 0.84 oz
•
inch)
Forward
CQ-102C
2 to 6 g
•
cm
Back Tension (0.028– 0.083 oz
•
inch)
Reverse CQ-102RC
36 to 61 g
•
cm
(0.50 – 0.84 oz
•
inch)
Reverse
CQ-102RC
2 to 6 g
•
cm
Back Tension (0.028 – 0.083 oz
•
inch)
FF, REW CQ-201B
61 to 143 g
•
cm
(0.85– 1.99 oz
•
inch)
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Tape Tension Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A more than 100g (3.53 oz)
Reverse CQ-403R more than 100g (3.53 oz)
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head pinch roller
erase head rubber belts
capstan idlers
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.
3-2. ELECTRICAL ADJUSTMENTS
DECK SECTION
1. The adjustment should be performed in the publication.
(Be sure to make playback adjustment at first.)
2. The adjustment and measurement should be performed for both
L-CH and R-CH.
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Switch position
DOLBY NR switch : OFF
FUNCTION button : OFF
EFECT switch : OFF
DBFB switch : OFF
3. Deck section electrical adjustments are made in test mode by
pressing CD STOP, DECK A STOP, and DECK B STOP at the
same time.
4. Input point and output level measurement point.
Tape Contents Use
P-4-A100 10 kHz, –10dB Head Azimuth Adjustment
P-4-L300 315Hz, 0dB Level Adjustment
WS-48B 3kHz, 0dB Tape Speed Adjustment
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Tast tape
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Procedure :
1. Forward Playback mode
Reverse Playback mode
Output level
measurement
point
Input point
R-CH
L-CH
Output level
measurement
point
SYSTEM
CONTROL 1
CN151
12
14
11 10
REC (R)
REC (L)
PB (R)
PB (L)
AF OSC
attenuator
MAIN BOARD
0 dB=0.775V
test tape
P-4-A100
(10kHz, –10dB)
set
VTVM
+
–
Output level measurement point