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TX-25/28W2C
TX-25/28W2Cl
ITEM/PREPARATION
ADJUSTMENT
PROCEDURE
=
SUB CONTRAST
1.
Receive the Philips pattern.
(Input level : 75 dB.)
2.
Connect an oscilloscope to TPE15.
3.
Set controls:
Bright
.........
minimum
Contrast
......... maximum
Colour
.........
minimum
4.
Earth TPE7.
PAL APC
—
Receive the Philips pattern.
2.
Connect a short jumper between TPE76
and earth.
3.
Connect oscilloscope to TPE15.
SUB COLOUR
1.
Receive a PAL colour bar pattern.
2.
Set controls:
Bright
..... minimum
Contrast ..... maximum
Colour
..... centre
3.
Connect a short jumper between
TPE6
and earth.
4.
Connect an oscilloscope to TPE15 .
TELETEXT CONTRAST
1.
Receive a teletext signal.
2.
Connect an oscilloscope to H1 pin 6.
BELL FILTER
1.
Receive a Philips pattern.
(SECAM)
2.
Connect an oscilloscope to TPE6S.
through a 10k2 resistor.
(10:1 probe )
1.
Adjust Sub-Bright
R321 to set the black
level to 0.2 V.
2.
Adjust the Sub-Contrast
R317 to set the
drive voltage to 2.7 V O-p.
3.
Remove link from TPE7.
2.
Remove link and confirm colour bars are
stationary.
1,
Adjust sub colour R606 for 1.6 Vp-p
+/- 0.1 V at TPE15 as shown in Fig 11.
2.
Remove the short jumper.
1,
Adjust R3814 for 25 Vp-p
+/- 0.1V
as shown in Fig 12.
Note:
If H1 is not connected to E-PCB, a 1502
resistor has to be connected between
H1 pin 6 and ground.
1.
Adjust L600 to obtain the waveform as
shown in Fig 13.
WAVEFORM
Adjust by R317
1.6Vp-p +/- 0.1V
Fig.11
5Vp-p
-+/- 0.1V
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Fig.12
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