Read Sony HS-RM436 / HS-RM439 Service Manual online
7
HS-RM436/RM439
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head
pinch roller
capstan
rubber belt
2. Demagnetize the playback head with a head demagnetizer.
Do not use a magnetized screwdriver for the adjustments.
3. These measurement and adjustment should be performed with
the rated power supply voltage (2.5 V) unless otherwise noted.
Torque Measurement
Mode
Torque meter
Meter reading
FWD
1.97 to 4.90 mN•m
20 to 50 g • cm
CQ-102C
(0.28 to 0.69 oz• inch)
FWD
less than 0.19 mN•m
less than 2 g • cm
back tension
(less than 0.027 oz• inch)
FF, REW
CQ-201B
5.89 to 19.61 mN•m
60 to 200 g • cm
(0.84 to 2.77 oz• inch)
SECTION 3
ADJUSTMENTS
3-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
•
Supplied voltage : 2.5V.
•
Switch and control position
SUPER BASS (S809) : OFF
VOLUME control (RV301) : maximum
SUPER BASS (S809) : OFF
VOLUME control (RV301) : maximum
TAPE SECTION
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
Tape Speed Adjustment
Procedure :
1. Playback WS-48A (tape center part) and adjust SFR601 so that
the frequency counter reading becomes 3,000Hz.
Standard value : 2,985–3,015Hz
Standard value : 2,985–3,015Hz
2. Playback WS-48A (tape top and end) .
Check that frequency counter reading is within
±
1.0% of the
reading of step 1.
0 dB = 0.775V
set
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
frequency counter
32
Ω
phones jack (J301)
[MAIN BOARD] (SIDE B)
SFR601:
Tape speed Adjustment
Tape speed Adjustment
Adjustment Location :
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