Sanyo GCD 2700 - Tracking Balance Adjustment; Focus Gain Check; Tracking Gain Check; Eye Pattern Check

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PLAYER ADJUSTMENTS
PREPARATION FOR ADJUSTMENTS
1)
Measuring instruments, tools and filter
) Test disc :
F30L-50146 (Poly Gram) etc.
!)
Oscilloscope : SS5711 (1 O MHz or dual phenomen-
on) or,
Memory scope : DSS6521 (Storagescope)
I) AC voltmeter (–80dBt input impedance 1MQ or
more)
H AF-oscillator (400Hz, 500mV RMS)
;)
Screwdrivers (non-metalic) for adjustments.
j)
Band pass filter
. PARTS LOCATION
-----
.....
COMAIN PC.B
IF
TP101(RF)
TP102(FE)
TP103(1E)
TP1043ND)
-$&
IOTE: 1. All measurements are referred toTP104 (GND).
2. Adjust SVR11 is initial setting position, as shown in the illustration.
.
.-. .— -
:. ADJUSTMENTS
Adjustment
Test
Measuring
Input
output -
- Adjustment
Adjustment
Item
disc instrument
connection
connection
location
value
(a) Tracking
TP103 (TE)
Waveform
balance
Oscilloscope
...............
TP104 (GND)
SVR11
symmetrical
adjustment
F30L-
referred to OV.
(b) Checking the
50146
Memory scope
IC101 @ (H),
TP102 (FE) .. .. .. ....... ..
500m Vp-p * 3dB
focus gain
Oscilloscope
TP104 (GND)
TP104 (GND)
(c) Checing the
Oscillator
Band pass
IC101 @ (H),
TP102 (TE)
.... ... ........
500m Vp-p * 3dB
tracking gain
filter
TP104 (GND)
TP104 (GND)
(d) Checking the
TP101 (RF)
..... ... ...... .
Oscilloscope
....... ........ “ Eye n pattern.
eye pattern
TP104 (GND)
... .
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