Preparation For Adjustments; Parts Location - Sanyo GCD 2700 Service Manual

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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
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. . .. .
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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