ELECTRICAL ADJUSTMENTS
D-2
20AF45/20AF45C
2-9: HORIZONTAL PHASE
1.
2.
3.
4.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to
normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select “H.PHASE”.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on right and
left becomes minimum.
2-5: VERTICAL POSITION
1.
2.
3.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Adjust the VR401 until the horizontal line becomes fit to
the notch of the shadow mask.
(Refer to Fig. 2-1)
2-6: VERTICAL SIZE
1.
2.
3.
4.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (07) on the remote control to
select “V. SIZE”.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on upside
and downside becomes 9
±
2%.
2-7: VERTICAL LINEARITY
NOTE: Adjust after performing adjustments in section 2-6.
After the adjustment of Vertical Linearity, reconfirm
the Vertical Position and Vertical Size adjustments.
Receive the monoscope pattern.
Using the remote control, set the brightness, contrast,
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (08) on the remote control to
select “V. LINEARITY”.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on upside
and downside becomes minimum.
1.
2.
3.
4.
2-8: LEVEL
1.
2.
3.
Connect the AC voltmeter to pin 6 of CP101.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (33) on the remote control to
select “LEVEL”.
Press the VOL. UP/DOWN button on the remote control
until the AC voltmeter is 85
±
2mV.
2-10: CONTRAST MAX
1.
2.
3.
4.
5.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (18) on the remote control to
select “CONT. MAX”.
Press the VOL. UP/DOWN button on the remote
control until the contrast step No. becomes “95”.
Receive a broadcast and check if the picture is normal.
Press the TV/VIDEO button on the remote control to set
to the AV mode. Then perform the above adjustments 1~3.
Press the TV/VIDEO button on the remote control to set
to the CS mode. Then perform the above adjustments
1~3.
2-11: SEPARATION 1, 2
Please do the method (1) or method (2) adjustment.
Method (1)
1.
2.
3.
4.
5.
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.
Connect the oscilloscope to the pin 6 and pin 7 of CP101.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (34) on the remote control to
select “SEP 1”.
Press the VOL. UP/DOWN button on the remote control
to adjust it until the audio output wave becomes a fine
sine wave.
Press the CH UP button once the set to “SEP 2” mode.
Then perform the above adjustment 4.
Method (2)
1.
2.
3.
4.
5.
6.
7.
8.
9.
Set the multi-sound signal generator L-ch=1KHz, R-ch
=Non input and receive the RF.
Connect the oscilloscope to the pin 6 of CP101.
Press the AUDIO SELECT button on the remote control
to set to the stereo mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (34) on the remote control to
select “SEP 1”.
Press the VOL. UP/DOWN button on the remote control
to adjust it until the R-ch output becomes minimum.
Set the multi-sound signal generator L-ch=Non input,
R-ch=1KHz and receive the RF.
Connect the oscilloscope to the pin 7 of CP101.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (35) on the remote control to
select “SEP 2”.
Press the VOL. UP/DOWN button on the remote control
to adjust it until the L-ch output becomes minimum.
The output difference of the between with Filter and
without Filter should be more than 25db for both L and R.
Shadow mask
Notch
horizontal line
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Fig. 2-1
