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ADJUSTMENT PROCEDURES
Instruments Required
Dual trace oscilloscope, Frequency counter, AF signal gererator, Test disc (SONY YEDS-18), AC voltmeter,
Jitter meter, and Socket P4 (Part no. 25050138)
1. VCO Frequency Adjustment
Connect the frequency counter to terminal P110.
Turn the power switch to ON. (No load the disc.)
Adjust R154 so that the frequency counter reading
becomes 4322 +5kHz.
After adjustment, disconnect the frequency counter.
Mode: STOP.
2. RF Offset Adjustment
Connect the oscilloscope to terminal P106.
Adjust R192 so that the RF signal becomes
100mV
+30mV.
Mode: STOP
—100mv
Photo 1
3. Tracking Balance Adjustment
Turn R108 clockwise 45° from the mechanical center.
Connect the oscilloscope to terminal P107 TR.
Adjust R195 so that the TR signal becomes 0 +30mV.
Turn R108 to the mechanical center.
Mode: STOP
4. Focus Offset Adjustment
Load the test disc YEDS-18 on the tray and play the
track 2.
Connect
the oscilloscope or jitter meter to terminal
P106.
(Oscilloscope)
Adjust R110 until a clear trace of waveform pattern as
shown photo 1 appear on the oscilloscope.
When
the amount
of jitter is broad, set R110
to
mechanical center.
(Jitter meter)
Adjust R110 until the jitter meter reading becomes
minimum. (Less than 10ns.)
After adjustment, disconnect the oscilloscope or jitter
meter.
Photo 2
RF
GND
RF Offset 0.2usidiv. 100mVidiv.
GND
Frequency
P108
counter
PLCK
+
Lilec== a
2
GND
P106
1
Oscillo-
2
scope
P107
1
2
3
Oscilloscope
4
P106
1
2
RF
+
Oscilloscope range
1
Vertical
—: 0.5V/div.
2
Oscilloscope}
Holizontal
: 0.5ps/div.
GND
AC
P106
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