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AV-27BM3
AV-27CM3.
@ ADJUSTMENT PROCEDURE
Measuring
:
ae
Hem
eens
He
Test point
| Adjustment part
Description
eMAIN CIRCUIT
B1 POWER
DC voltmeter
| TP-91
1. Confirm that the voltage between TP-91 and TP-E
SUPPLY check
Tp-E (1)
(1) is DC 129.3V +1.5v.
NOISE (RF AGC)
NOISE VR
1. Adjust the NOISE VA so that the noise appears in
adjustment
(R135)
the picture.
2. Next the NOISE VR in a direction that tho noise
disappears from the picture and stop at the point
where the noise has disappeared from the picture.
3. Tur to another charmiet and coniinn that.ihere are
no abnormal ities.
COLOR SYNC,
Pattern
TP-54
C FSC. VR
1. Receive the color bar signal.
adjustment
generator
(Fsc FREE)
| (R316)
2. Use ashorting clip or other means to connect TP-61
and @ pin (9V line) of 10101.
Oscilioscope
® pin of
3. Adjust the C FSC. VR to change the picture from
(C101
color stripes to still color bar.
(SV line)
4. Remove the connections and check that the color
synchronization does not deteriorate on any of the
channels.
-{
SEPARATION
TV multi
VARIABLE
SEPARATION VR | 1. Set the TV multichannel sound signal generator for
adjustment
channel sound
| AUDIO
(R606)
generating stereo signal and output signal of about
generator
OUTPUT
3kH2z from the left channel.
L&R
2. Connect an oscilloscope to the "L" output and
Oscilloscope
oblain a clear view of i-cycle portion of 3kHz
waveforms.
3. Change connection of the oscilloscope to the "R"
output and expand the voltage axis.
4. Adjust the SEPARATION
VR and minimize the
3kHz crosstalk portion.
1 cycle
L + Channel signal waveform
Minimum
R - Channel crosstalk portion
FOCUS
FOCUS VR
1, Adjust the FOCUS VR to oblain clear pictures.
adjustment
{built in FBT)
2. Check that pictures have been adjusted to optimum
appearance in both center and peripheral areas of
the screen.
(No.50718) 9
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