Toshiba 20A42 Service Manual - Page 14
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White 100%
2-14: SUB CONTRAST
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (17) on the remote control to
select "CONT.MAX".
2.
Press the VOL. UP/DOWN button on the remote control
until the contrast step No. becomes "65".
3.
Receive a broadcast and check if the picture is normal.
4.
Press the TV/VIDEO button on the remote to set to the
AV mode. Then perform the above adjustment 1~3.
2-15: SEPARATION 1, 2
Please do the method (1) or method (2) adjustment.
Method (1)
1.
Set the multi-sound signal generator for each different L-
ch and R-ch frequency (Ex. L-ch=2KHz, R-ch=400Hz) and
receive the RF.
2.
Connect the oscilloscope to the pin 6 of CP601 and pin 7
of CP601.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (26) on the remote control to
select "SEP 1".
4.
Press the VOL. UP/DOWN button on the remote control to
adjust it until the audio output wave becomes a fine sine
wave.
5.
Press the CH UP button once the set to "SEP 2" mode.
Then perform the above adjustment 4.
ELECTRICAL ADJUSTMENTS
"A"
Red 110%
Method (2)
1.
Set the multi-sound signal generator L-ch=1KHz, R-ch
=Non input and receive the RF.
2.
Connect the oscilloscope to the pin 7 of CP601.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (26) on the remote control to
select "SEP 1".
4.
Press the VOL. UP/DOWN button on the remote control to
adjust it until the R-ch output becomes minimum.
5.
Set the multi-sound signal generator L-ch=Non input,
Fig. 2-2
R-ch=1KHz and receive the RF.
6.
Connect the oscilloscope to the pin 6 of CP601.
7.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (27) on the remote control to
select "SEP 2".
8.
Press the VOL. UP/DOWN button on the remote control to
adjust it until the L-ch output becomes minimum.
2-16: FM LEVEL
1.
Receive the monoscope pattern (70~80dB).
2.
Connect the AC voltmeter to pin 14 of IC901.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (24) on the remote control to
Fig. 2-3
select "FM LEVEL".
4.
Press the VOL. UP/DOWN button on the remote control
until the AC voltmeter is 75 ± 5mV.
2-17: LEVEL
1.
Receive the monoscope pattern (70~80dB).
2.
Connect the AC voltmeter to pin 6 of CP601.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (25) on the remote control to
select "LEVEL".
4.
Press the VOL. UP/DOWN button on the remote control
until the AC voltmeter is 100 ± 1mV.
2-18: Confirmation of Fixed Value (step No.)
Please check if the fixed values of the each adjustment
items are set correctly referring below.
NO.
FUNCTION
04
H VCO
14
BRIGHT MAX
15
BRIGHT MIN
16
CONT CENT
18
CONT MIN
20
COLOR MAX
21
COLOR MIN
23
SHARPNESS
28
TEST MONO
29
TEST STEREO
RF
04
170
90
40
30
65
01
35
00
00