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6.
ADJUSTMENTS
6.1 ADJUSTMENT METHODS
If a disc player is adjusted incorrectly or inadequately, it may malfunction or not work at all even though there is
nothing at all wrong with the pickup or the circuitry. Adjust correctly following the adjustment procedure.
@ Adjustment items/verification items and order
@ Measuring instruments and tools
35
a
[1 [Feesofieaaiainene
[FP Fm(Fcs ERR) | VRIORCS.OF)
2 [engines —_———*( Pn aCTRK ERR) | Grtngadnet ae
[2 Teskingenoroise ment [TPP 2CTRK ERR) | VRIOQCTRK BAL)
tee [mien
guar _|
be:
RF level adjustment
TP1, Pin 1 (RF)
VR1 (RF level)
TP], Pin 5(FCS. IN)
ee Focus servo loop gain adjustment
TP1, Pin 6(FCS. ERR)
VR152 (FCS. GAN)
TP1, Pin 3(TRK. IN)
t
Vv
pra Tracking servo loop gain adjustment
TPI, Pin 2(TRK. ERR)
R151 (TRK. GAN)
PB
| Focus error signal verification
TP1, Pin6(FCS. ERR)
@ Abbreviation table
1. Dual trance oscilloscope (10:1 probe)
2. Low-frequency oscillator
3. Test disc (YEDS- 7)
FCS. ERR
FCS. OFS
TRK. ERR
TRK. BAL
FCS. GAN
TRK. GAN
FCS. IN
TRK. IN
4. 12-cm disc (with at least about 70 minutes recording)
5. Low-pass filter (39 kQ + 0.001 u F)
6. Resistor (100 kQ )
7. Hexagonal wrench (M3 mm)
8. Standard tools
:Focus Error
:Focus Offset
:Tracking Error
:Tracking Balance
:Focus Gain
:Tracking Gain
:Focus In
:Tracking In
@ Test point and adjustment variable resistor positions
]10u1LNoO
OYHONAS
4930
GD
AVEWASSV
GYVOE
YSHLOW
@@
aq
2SIUA
ISIMA
COLMA
ZOIUA
Figure 1 Adjustment Locations
@ Notes
1. Use a 10:1 probe for the oscilloscope.
2. All the knob positions (settings) for the oscilloscope in the adjustment procedures are for when a 10:1 probe is
used.
@ Test mode
36
These models have a test mode so that the adjustments and checks required for service can be carried out easily.
When these models are in test mode, the keys on the front panel work differently from normal. Adjustments and
checks can be carried out by operating these keys with the correct procedure. For these models, all adjustments are
carried out in test mode.
[Setting these models to test mode]
How to set this model into test mode.
1. Unplug the power cord from the AC socket.
2. Short the test mode jumper wires. (See Figure 1.)
3. Plug the power cord back into the AC socket.
10
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