Pioneer LD-V4300D Service Manual page 85
Laserdisc player
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Also See for LD-V4300D:
- Service manual (99 pages) ,
- Operating instructions manual (23 pages)
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10.
RF GAIN ADJUSTMENT
•
Purpose: To
set
the
amplitude
of the RF
signal
to the
optimum value.
•
Symptoms
when
incorrectly
adjusted:
Dropout
occurs frequently.
Measurement equipment
&
jigs
•
Oscilloscope
•
Test disc: GGV1003
Adjusting procedure
Measurement equipment
connecting points
•
Oscilloscope:
In
the
FTSB
assembly
CH
I
:
Between
TPl-1
(RF) and GND
I. Play the
test disc and search for frame
#
15,000.
2.
Connect the oscilloscope to TPl-1 in the
FTSB
assem-
bly
to observe the
RF
signal.
3.
Adjust VRI
in
the
PREB
assembly so that the
amplitude of the
RF
signal
becomes
300
mV
±20mV.
(Photo
11)
Adjustment diagram
Player condition
•
ormal mode:
•
Still mode
•
TILT servo OFF
Waveforms
Adjusting points
•
VRI in the
FTSB
assembly
•
Oscilloscope range: AC100mV/div., 2mS/div
.
Oscilloscope
CH1
FTSB assembly
@l
00'21
I
" " -
9
[)
CN4
@
TP1
0
0
VR1
@
1
00mV±
20mV
~
•~
0
0
•
o
0
0
0
Photo 11
RF
signal
~
~6'1
Fig
.
10-1
116
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