Mechanical Adjustment - Sony CFM-A50 Service Manual

4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts wit2h a denatured-alcohol-moistened
swab :
record/playback head
erase head
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer. (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 sup-
ply voltage unless otherwise noted.
Torque Measurement
Torque Torque Meter
Forward CQ-102C
Forward
CQ-102C
Back Tension
Fast Forward CQ-201B
Rewind CQ-201B
Tape Tension Measurement
Torque Meter
CQ-403A
SECTION 4
ADJUSTMENTS
pinch roller
rubber belts
Meter Reading
20 – 55 g•cm
(0.28 – 0.76 oz•inch)
2 – 5 g•cm
(0.028 – 0.069 oz•inch)
more than 50 g•cm
(more than 0.7 oz•inch)
more than 50 g•cm
(more than 0.7 oz•inch)
Meter Reading
more than 70g
(more than 2.47 oz)
4-2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
FUNCTION switch
SLOW PLAYBACK switch
EASY LISTENING ADJUSTMENT switch : OFF
VOLUME
Standard Output Level
Output terminal
load impedance
output signal level
Test Tape
Type
WS-48A 3kHz, 0dB
0dB=0.775V
Record/Playback Head Azimuth Adjustment
Procedure :
1. Playback Mode
test tape
P-4-A100
(10kHz, -10dB)
2. Rotate the screw to adjust level meter reading to the maximum.
Note : Adjust to the maximum peak though there may be two or
three peakes
3. After the adjustment, lock the adjustment screws with suitable
locking compound.
Adjustment Location :
– 8 –
: TAPE (RADIO OFF)
: OFF
: MIN
Earphone Speaker
32Ω 3.2Ω
0.25V (–10dB) 0.775V (0dB)
Signal Used for
Tape Speed Adjustment
level meter
32 Ω
set
J101 (Earphone jack)
adjustment screw