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WM-EX422
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head
capstan
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 (1.5 V) unless otherwise noted.
Torque Measurement
Mode
Torque meter
FWD
CQ-102C
FWD
back tension
REV
CQ-102RC
REV
back tension
FF, REW
CQ-201B
8
SECTION 4
ADJUSTMENTS
4-2. ELECTRICAL ADJUSTMENTS
• Supplied voltage : 1.5V.
• Switch and control position
pinch roller
rubber belt
Test Tape
Meter reading
1.97 – 4.11 mN • m
20 – 42 g • cm
(0.28 – 0.58 oz• inch)
less than 0.19 mN • m
less than 2 g • cm
Tape Speed Adjustment
(less than 0.027 oz• inch)
Procedure :
1.97 – 4.11 mN • m
20 – 42 g • cm
(0.28 – 0.58 oz• inch)
less than 0.19 mN • m
less than 2 g • cm
(less than 0.027 oz• inch)
more than 5.89 mN • m
more than 60 g • cm
(more than 0.84 oz• inch)
1. Playback WS-48A (tape center part) in the FWD state and ad-
2. Playback WS-48A (tape center part) in the REV state.
Adjustment Location :
PRECAUTION
MEGA BASS : NORMAL
VOLUME control (RV301) : maximum
AVLS : OFF
HOLD : OFF
PB EQ : NORMAL
0 dB = 0.775V
TAPE SECTION
Type
Signal
WS-48A
3kHz, 0dB
test tape
WS-48A
(3kHz, 0dB)
set
phones jack (J301)
just RV601 so that the frequency counter reading becomes
2,985Hz.
Standard value : 2,970–3,000Hz
Check that frequency counter reading is within ±1.5% of the
reading of step 1.
MAIN BOARD (SIDE B)
RV601 : Tape speed adjustment
Used for
Tape Speed Adjustment
frequency counter
16 Ω
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