WM-FX700/FX890/FX900
11
SECTION 4
MECHANICAL ADJUSTMENT
SECTION 5
ELECTRICAL ADJUSTMENT
PRECAUTION
1.
Clean the following parts with a denatured-alcohol-moistened
swab:
playback head
pinch roller
rubber belts
capstan
2.
Demagnetize the 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
powersupply voltage (1.3 V) unless otherwise noted.
Torque Measurement
Mode
Torque meter
Meter reading
FWD
1.57 – 2.45 mN • m
(16 – 25 g • cm)
CQ-102C
(0.23 – 0.34 oz • inch)
FWD
0.49 – 1.47 mN • m
Back Tension
(0.5 – 1.5 g • cm)
(0.007 – 0.02 oz • inch)
REV
1.57 – 2.45 mN • m
(16 – 25 g • cm)
CQ-102RC
(0.23 – 0.34 oz • inch)
REV
0.49 – 1.47 mN • m
Back Tension
(0.5 – 1.5 g • cm)
(0.007 – 0.02 oz • inch)
more than 4.90 mN • m
FF, REW
CQ-201B
(more than 50 g • cm)
(more than 0.7 oz • inch)
PRECAUTION
1.
Specified voltage : 1.3 V (DC)
2.
Setting
SPEED CONTROL (RV602) : Center Value
MONO/ST :
FM STEREO
Test tape
Type
Signal
Used for
WS-48A
3 kHz, 0 dB
Tape Speed Adjustment
Tape Speed Adjustment
Procedure:
1.
Playback WS-48A (tape center) in the FWD state.
Test tape
WS-48A
(3kHz, 0dB)
Set
i
REMOTE jack (J301)
16
Ω
Frequency counter
+
–
2.
Confirm Speed CONTROL (RV602) at center value (click
feeling).
3.
Adjust RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Values:
2,970 to 3,030 Hz
4.
Check that deflection of the frequency counter reading between
the beginning and the end of tape is within 1.5% (apporox. 45
Hz).
Adjustment Point:
– MAIN Board (Side B) –
RV601
J301
RV601 : Tape Speed Adjustment
