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6 RF Offset Adjustment
* Purpose:
To adjust the RF amplifier offset to a suitable value.
« Maladjustment symptoms:
Focus closure fails readily.
* Measuring equipment / jigs:
Oscilloscope, volume adjustment driver
¢ Measuring point:
RFO
¢ Test disc and setting:
SONY TYPE 4 (or ABEX TCD-782)
Normal mode
« Adjustment position:
VR352 (RFO)
MAIN UNIT
Oscilloscope
REFOUT
1mS / div.
0.5V / div.
OC mode
When using a multi-channel oscilloscope,
do not connect the other negative probe
to ground.
Adjustment Procedure
1. Play tune TNO 12 in normal mode.(ABEX TCD-782:TNO
19)
2. Using VR352 to adjust the RFO waveform so that
REFOUT appears at the center.(A-B must not exceed
100 mV.)
REFOUT
7 TE Offset Adjustment-1
¢ Purpose:
To adjust the electrical offset of the tracking servo to
zero.
3
.
*Maladjustment symptoms:
|
Search times too long, carriage run-away.
* Measuring equipment / jigs:
DC voltmeter or oscilloscope, volume adjustment driv-
er
« Measuring point:
TEY
* Test disc and setting:
Enpty magazine
Test mode
«Adjustment position:
VR353
Oscilloscope
MAIN UNIT
REFOUT
=
20mV/ div.
[|
1ImS / div.
DC mode
Adjustment Procedure
1. Select a tray without a disk, while in test mode.
2. Switch regulator ON.
4. Switch regulator OFF.
19
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