Sony PMC-222V, Руководство по обслуживанию

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SECTION 3
MECHANICAL ADJUSTMENTS
1. The sdjustments should be perfomed in the order given in the
service manual. (As a general rule. Playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
2. The adjustments should be performed for both L-ch and R-ch
unless otherwise indicated.
Standard output level
Test tape
Tape Speed Adjustment
Procedure :
Mode : Playback
Adjustment Value : normal tape speed
Frequency difference between the beginning and the end of the tape
should be within 1% (30Hz).
Adjustment Location :
Test Tape
WS-48A
P-4-A063
Used for
Tape speed adjustment
Head azimuth adjustment.
Signal
3kHz, 0dB
6.3kHz, –10dB
PRECAUTION
1. Clean the following parts with a denatured-alchool-moistened
swab:
record/playback head pinch roller
erase head rubber belts
capstans
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close to the
erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Torque Measurement
Tape Tension Measurement
Meter Reading
30 – 80g
•
cm
(0.42 – 1.12 oz
•
inch)
1.5 – 5.5g
•
cm
(0.021 – 0.07 oz
•
inch)
50 – 130g
•
cm
(0.77 – 1.80 oz
•
inch)
50 – 130g
•
cm
(0.77 – 1.80 oz
•
inch)
Mode
FWD
FWD
back tension
Fast Forward
Rewind
Torque Meter
CQ-102C
CQ-201B
1dB = 0.775V
Digital frequency counter
2,970 – 3,030Hz
Speed checker
–1.0 to 1.0%
TAPE RECODER SECTION
HP OUT
32
Ω
0.25 V (–10dB)
Output Pin
Load impedance
Output signal level
SP OUT
6
Ω
0.775 V (0dB)
32
Ω
test tape
WS-48A
(3kHz, 0dB)
set
digital frequency
counter
J303 (phones)
+
–
Torque Meter
CQ-403A
Meter Reading
more than 100g
(more than 3.53 oz)
MODE
FWD
SECTION 4
ELECTRICAL ADJUSTMENTS