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AV-2750S
AV-2760S
Measuring
Test point
Adjustment part
Description
instrument
VERTICAL
VERTICAL CENTER
|1- Switching the VERTICAL CENTER SWITCH back and forth
CENTER
;
SWITCH
will allow you to move the screen position. either upward or
;
downward.
.
FOCUS VR
. Adjust.the FOCUS VR to obtain clear pictures.
. Check that pictures have been adjusted to optimum appearance
in both central and peripheral areas of the screen.
MULTI-
OUTPUT L, R
|CHANNEL
SOUND
GENERATOR
. Set the TV.multichannel sound signal-generator for generating
stereo signal and output signal of about 3KHz from the left
channel.
. Connect an oscilloscope to the " L" output and obtain a clear
view of 1- cycle portion of 3KHz waveforms.
. Change connection of the oscilloscope to the "R" output and
expand the voltage axis.
. Adjust the SEPARATION VR and minimize the 3KHz crosstalk
portion.
L-Channel
signal waveform
Minimum
R-Channel crosstalk portion
JNOTE
: Do not touch the VRs inside the. MULTICHANNEL SOUND CIRCUIT.
;
CRT SOCKET CIRCUIT
HORIZON-
SERVICE SWITCH
|1. Turning the SERVICE SWITCH from the N side to the S side
TAL LINE
will bring the horizontal line display to the screen.
_® |
Normal
pictuer
Checking method of the high voltage hold down circuit.
{1)
Make the short circuit across R905, 3302 15W UNF R
(shown in Fig. 2, : |:
) under normal operating
condition.
7
(2) Confirm the picture goes out.
VIDEO,CHROMA
:
T522
HV.T
HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT
iCg01
POWER
REGULATOR
22 (No{50360)
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