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ADJUSTMENTS
ITEM/PREPARATION
ADJUSTMENT PROCEDURE
B VOLTAGE
1. Operate the TV set.
2. Set controls:
TPE1:
BGG
ie ops enaaten oe minimum
TPE2:
CONtaSt
ccs eisiceae oe minimum
TPE3:
Sub-Bright ............ minimum
TPE4:
. Confirm the indicated test points for the specified voltage.
155.0+1.5V
TPES:
12.0+1.0V
5.0+0.5V
TPE34:
250+
1.5V
32.0+2V
TPE35:
85V+1.0V
155+
1.0V
TPE10:
205V+10v
AFC
1. Operate the TV set.
2. Set a channel in UHF band.
.. Adjust L102 Voltage at TPE22 6.0 V + 0.1 V.
3. Supply 38.9 MHz continuous wave to TP of Tuner.
4. Connect a DC voltmeter to TPE22.
RF AGC
1. Receive a colour bar pattern.
2. Set the input level to 66 dB + 2 dB (75 open).
3. Connect an oscilloscope to TPE9 with DC mode.
HIGH VOLTAGE
1. Operate the TV set.
2. Set controls:
BriQnt cicceawoeewutne Ss minimum
CONITASt pac exsdcdire ts minimum
Sub-Bright ............ minimum
TELETEXT CLOCK
1. Operate the TV set and confirm the B voltage.
2. Connect a frequency counter to TPT6.
3. Earth TPT5.
ITEM/PREPARATION
ADJUSTMENT PROCEDURE
SUB CONTRAST
1. Receive a colour bar pattern.
2. Connect an osci!loscope to TPE15.
3. Set controls:
minimum
maximum
minimum
Picture
centre
Contrast
PAL APC
1. Receive a PAL colour bar pattern.
2. Connect
link
between
TPE12
and
TPE14, TPE11 and TPES
3. Connect oscilloscope to TPE15.
PAL DELAY LINE
1. Receive a PAL colour bar pattern.
2. Connect a 1000 resistor across TPE6
and ground.
3. Connect an oscilloscope to TPE15.
. Turn RF AGC control (R102) fully clockwise.
TPES drops.
. Slowly turn R102 counterclockwise to set it at the point just before voltage at
. Confirm that the high voltage is within a range of 25.2 kV + 1.5 kV, —1.5 kV.
Note:
lf the high voltage is out of tolerance, confirm that voltage at zero beam current
(Bright, Contrast and Colour controls to their minimum positions) is within the
above tolerance.
. Adjust Sub-Bright (R321) for 1.5 V.
. Connect link between TPE7 and earth.
Adjust sub-contrasi (R317) for 3.0 V p-p.
. Remove link from TPE7.
. Adjust
APC
trimmer
(C610)
to
obtain
stationary or slowly moving colour bars as
Fig. 7.
. Remove
links and confirm colour bars are
stationary
. Adjust
DL Adj. (R609) and
DL Matching
Trans.
L602, L603) to obtain
waveform
at
TPE15 as shown in Fig. 8.
. Adjust C3528. Reading of the counter: 6.0 MHz + 200 Hz.
|
WAVEFORM
(Adjust by R321)
3.0V of p+0.1V
(Adjust by R317)
Adjust this level
to zero
Minimize the differerwces
(by L602, L603)
Adjust this level
to zero (by R609)
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