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Panasonic TX-C84DRS Service Seite 8

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TX-C84DRS
:
ITEM/PREPARATION
ADJUSTMENT PROCEDURE
WAVEFORM
SUB CONTRAST
1. Receive acolour bar pattern (SECAM).
(Adjust by R321)
1. Adjust Sub-Bright (R321) for 2.5 V higher
than black level.
2. Connect link between TPE7 and earth.
_ Adjust sub-contrast (R317) for 3.2 V p-p.
2. Connect an oscilloscope to TPE15.
Bright....... oe weraat minimum
Contrast
............-- maximum
3. Remove link from TPE7.
(Adjust by R317)
Colour « ai/eneuwan awd minimum
PICIUTO 2h
cured teas cenire
PAL APC
1. Receive a PAL colour bar pattern.
2. Earth TPE76.
3. Connect oscilloscope to TPE15.
. Adjust
APC
trimmer
(C637)
to obtain
stationary or slowly moving colour bars as
Fig. 6.
2. Remove
link and confirm colour bars are
stationary.
Adjust this level
to zero
Minimize the differences
(by L603)
PAL DELAY LINE —
1. Adjust DL Adj. (R609) and DL Matching
Trans. (L603) to obtain waveform at TPE15
as shown in Fig. 7.
1. Receive a PAL colour bar pattern.
Adjust this level
2. Connect a 1002 resistor
a c r o s s
TPE6
.
pe
terete
to zero (by R609)
and ground.
|
3. Connect an oscilloscope to TPE15.
SUB COLOUR .
1. Receive a PAL colour bar pattern.
1. Adjust colour to achieve 5.3 V at TPE21.
2. Connect a 1000 resistor between TPE6 and
2. Set controls:
contrast
.......... re maximum
earth.
ain ae
oe aad ae ae
a pata |
. Adjust sub colour (R606). For 1.5 Vpp + +0.1V
_
sub colour ..........-......centre |
@t TPE15
as shown in Fig. 8.
1.5V
pp +0.1V
4. Connect an oscilloscope to TPE15.
_ | TELETEXT CONTRAST 7
Note:
|
Before
this adjustment
is attempted,
| white
balance adjustment
must be
finished.
.
1: Receive a teletext signal.
. Adjust R3514 to obtain the waveform as
shown in Fig 9.
3. Set controls:
bright......... een
minimum .
contrast......... pies maximum -
| BELL FILTER/
LINE DiISCRIMINATOR
Fig. 9
+ NOGOOD
: -| 1. Receive a Philips pattern (SECAM).
2. Connect an oscilloscope to TPE69.
. Adjust L609 to obtain waveform as shown in
Fig. 10.
TOTTI
«= ecb
AARNAR AOSAR MUTE RA

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