Read Sony HS-JM400 Service Manual online
8
HS-JM400
SECTION 4
MECHANICAL ADJUSTMENT
SECTION 5
ELECTRICAL ADJUSTMENT
PRECAUTION
1.
Specified voltage: 2.5 V (DC)
2.
Switch and control position
VOL
: MAX
SPEAKER
: OFF
AVLS
: NORM
SUPER BASS
: OFF
PAUSE
: OFF
ISS
: 1
FM MODE
: FM ST
TAPE SECTION
0dB= 0.776V
Tape Speed Adjustment
Procedure:
Procedure:
1.
Enter the FWD playback mode.
2.
Adjust RV601 so that the value of the frequency counter reading
becomes 3,000 Hz.
Specification value:
becomes 3,000 Hz.
Specification value:
Frequency counter
2,985 Hz – 3,015 Hz
2,985 Hz – 3,015 Hz
3.
Check that the frequency deviation at the beginning and ending
of a tape is within 1.5 % (45 Hz).
of a tape is within 1.5 % (45 Hz).
Adjustment Location : MAIN board (see page 9)
PRECAUTION
1.
Clean the following parts with a denatured-alcohol-moistened
swab:
swab:
record/playback/erase head
pinch roller
rubber belts
capstan
2.
Demagnetize the record/playback head with a head demagnet-
izer. (Do not bring a head demagnetizer close to the erase
head.)
izer. (Do not bring a head demagnetizer close to the erase
head.)
3.
Do not use a magnetized screwdriver for the adjustments.
4.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
supply voltage unless otherwise noted.
• Torque Measurement
Signal
3 kHz, 0 dB
Used for
Tape Speed Adjustment
Tape
WS-48A
Test tape
WS-48A
(3kHz, 0dB)
Set
2
jack (J301)
16
Ω
Frequency counter
+
–
Mode
FWD
FWD
Back Tension
FF, REW
Torque Meter
CQ-102D
CQ-102D
CQ-201B
Meter Reading
19.6 to 39.2 mN•m
(20 to 40 g•cm)
(0.28 to 0.56 oz•inch)
0.49 to 4.9 mN•m
(0.5 to 5.0 g•cm)
(0.0069 to 0.0069 oz•inch)
More than 49 mN•m
(More than 540 g•cm)
(More than 0.69 oz•inch)
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