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Control position and equipment used
® Sensitivity selector....... M
® Oscilloscope
e
DC voltmeter
e Record (SFTROO7) for adjustment
START POSITION ADJUSTMENT
1. Put on a 30cm record.
2. Turn the power switch "on", and press the start button.
3. If the stylus drops too much inside or outside the
record, adjust the start position by turning the
adjusting screw.
e
Clockwise................
Stylus drop position is
shifted inside.
e Counterclockwise
....... Stylus drop position is
shifted outside.
ne a
Start position \
g-BGiusting screw
SENSOR GAIN ADJUSTMENT
2. Put on the record with side A up and close the upper
cabinet.
3. Turn the power switch on with the tonearm at the rest
position. (Blank area of the record.)
4. Adjust VR401 so that the output voltage is 8.5V+0.3V
Unit
DC voltmeter
SENSOR RESOLUTION ADJUSTMENT
1. Set the size selector to "manual" position.
2. Connect the oscilloscope to 1C401 pin 9 (+) and
ground (-).
3. Put on the record with side A up and close the upper
cabinet.
4. Turn the power switch on and keep the F skip switch
depressed to move the tonearm.
(Output voltage is delivered between the tunes.)
5. Adjust VR402 so that the peak output between tunes
is 3.4V+0.3V.
_
Unit
10401
Ground
Oo)
©
Oscilloscope setting
Oscilloscope
e@
Waveform
STYLUS CUE-DOWN POSITION
ADJUSTMENT
1. Connect lead wire clip to CN301
pins 1 and 5 of
operation circuit board. (Muting operation stops.)
2. Open the upper cabinet and hold down the cabinet
switch with tape.
3. Put on the record with side B up and close the upper
cabinet.
4. Connect the unit to the amplifier.
(Connect the speakers to the speaker terminals.)
5. Turn the power switch on and push program key 2,
followed by the start switch.
6. Adjust VR302 so that the descending position is at
count "15".
MOLT. css 1V
SWEEP...«..:..: 10usec.
INPUT..... DC
3.4V+0.3V
VR302
SERVO GAIN AND OFFSET VOLTAGE
ADJUSTMENT
1. Remove the dust cover.
2. Connect DC voltmeter to BT501 pin 3 (+) and pin5
(-).
3. Turn the power switch "on".
4. Turn the VR501 so that the voltage is 6V with tonearm
completely turned to the right (offset angle sensor
"open"). (Servo gain adjustment)
5. Return the tonearm to the center and make sure that
the voltage is 3V.
6. If the voltage is not 3V, adjust it by turning the offset
voltage adjusting screw. (Offset voltage adjustment)
e Adjustment point
[vR501]
501}
SERVO GAIN
Unit
BT501
®
®
@ Tonearm turns to
the right
Offset
angle sensor
DC voltmeter
e Tonearm at center
Ae
Tonearm
| VR402|
Adjustment
screw
=A@G ==
Sensor gain adjustment
Sensor resolution
adjustment
OFFSET VOLTAGE
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