Adjustments; Mechanical Adjustments; Electrical Adjustments - Sony CFM-D1JMK2 Service Manual

CFM-D1JMK2/D1MK2

3-1. MECHANICAL ADJUSTMENTS

AND MEASUREMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-
moistened swab :
record/playback head
erase head
capstan
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 adjustments should be performed with the rated
power supply voltage unless otherwise noted.
Torque Measurement
Torque Torque Meter
Playback CQ-102C
Rewind CQ-201B
Fast Forward CQ-201B
Back Tention CQ-102C
Tape Tension Measurement
Torque Meter
CQ-403A
8
SECTION 3

ADJUSTMENTS

pinch roller
rubber belts
idlers
Meter Reading
2.95 – 6.86mN • m
(30-70g • cm)
(0.417-0.97oz• inch)
8.83 – 14.7mN • m
(90-150g • cm)
(1.24-2.08oz• inch)
8.83 – 14.7mN • m
(90-150g • cm)
(1.24-2.08oz• inch)
0.148 – 0.539mN • m
(1.5-5.5g • cm)
(0.02-0.76oz• inch)
Meter Reading
more than 170g (5.99 oz)

3-2. ELECTRICAL ADJUSTMENTS

CASSETE SECTION
Note : The adjustment should be performed in the order given in
this service manual.
Switches and controls should be set as follows unless
r
otherwise specified.
FUNCTION : TAPE (RADIO OFF)
max
VOLUME :
mechanical mid.
TONE :
Standard Output Level
load impedance
output level 0.775V (0dB)
Test Tape
Type Signal
WS-48A 3kHz, 0dB
P-4-A063 6.3kHz, – 10dB
Tape Speed Adjustment
Procedure :
Mode : playback
test tape
WS-48A
(3kHz, 0dB)
set
Adjustment Value :
Digital frequency counter
2,940 – 3,090 Hz
Frequency difference between the beginning and the end of
the tape should be within 1.5% (45Hz).
0 dB=0.775V
SP OUT EARPHONE
4Ω 32Ω
0.25V (–10dB)
Used for
Tape Speed Adjustment
Azimuth Adjustment
digital frequency
counter
32 Ω
- +
Earphone jack