Sony CFD-Z125 - Cd Radio Cassette-corder, Руководство по обслуживанию

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SECTION 5
ADJUSTMENTS
5-2. ELECTRICAL ADJUSTMENT
1. The adjustments 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 adjustment should be performed for both L-ch and R-ch
unless otherwise indicated.
•
Switch Location
FUNCTION switch ........................................................ TAPE
VOLUME switch ..................................................... maximum
Standard output level
Test tape
Record/Playback Head Azimuth Adjustment
Procedure :
1. Mode : Playback
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1dB.
PHONES
32
Ω
0.25 V (–10dB)
Load impedance
Output level
Type
P-4-A063
Used for
Head azimuth adjustment.
Signal
6.3kHz, –10dB
5-1. MECHANICAL ADJUSTMENT
PRECAUTION
1. Clean the following parts with a denatured-alchool-moistened
swab:
record/playback head pinch roller
erase head rubber belts
capstans idlers
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.
5. The adjustment should be performed with the rated power supply
voltage unless otherwise noted.
Torque Measurement
Tape Tension Measurement
Meter Reading
30 – 70 g
•
cm
(0.42 – 0. 97 oz
•
inch)
1 – 6 g
•
cm
(0.014 – 0.084 oz
•
inch)
more than 55 g
•
cm
(more than 0.76 oz
•
inch)
more than 55 g
•
cm
(more than 0.76 oz
•
inch)
Mode
FWD
FWD
back tension
FF
REW
Torque Meter
CQ-102C
CQ-201B
TAPE DECK SECTION
Mode
FWD
Meter Reading
more than 80g
(more than 1.12 oz
•
inch)
Tension Meter
CQ-403A
0 dB = 0.775V
SP OUT
32
Ω
0.775 V (0dB)
3.2
Ω
test tape
P-4-A063
(6.3kHz, –10dB)
set
level meter
SPEAKER terminal (JK302)
+
–
screw angle
L-CH
peak
R-CH
peak
R-CH
peak L-CH
peak
Screw
position
output
level
within
1dB
within
1dB