Adjustments; Mechanical Adjustment; Electrical Adjustment - Sony CHC-P11 Service Manual

SECTION 4
ADJUSTMENTS
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head pinch roller
erase head rubber belts
capstan
2. Demagnetize the record/playback head with a head demagnetizer.
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.
w&
@ Torque Measurement
[| Mode | Torque Meter
Forward CQ-102C
Meter Reading
36 to 61 gecm
(0.50 — 0.84 ozeinch)
Forward 2 to 6gecm
'
CQ-102C
Back Tension (0.026 — 0.082 oz*inch)
36 to 61gecm
Reverse CQ-102RC
Reverse
CQ-102RC
(0.50 — 0.84 ozeinch)
2 to 6gecm
(0.026 — 0.082 ozeinch)
61 to 143gecm
(0.85 - 1.98 ozeinch)
Back Tension
FF, REW CQ-201B
®@ Tape Tension Measurement
Torque Meter Meter Reading
Forward CQ-403A more than 100g (3.53 oz)
CQ-403R more than 100g (3.53 oz)
Reverse
4-2. 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.
@ Switch position
DOLBY NR switch : OFF
TIMER switch : OFF
DIRECTION MODE switch : ==
3. Deck section electrical adjustment are made in test mode by
pressing TUNER/BAND, DISPLAY, and FUNCTION at the
same time.
— Record Mode —
Level meter
eTest Tape
0dB=0.775V
Record/Playback Head Azimuth Adjustment
© Setup for adjustment
When adjusting the azimuth remove, the Window (DIS) in the
center of the front panel. (Refer to page 8.)
Procedure :
1. Forward Playback mode
Reverse Playback mode
test tape
P-4-A100
(10kHz, ~ 100B) Level meter