Panasonic TC-20KL03A - Page 11

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TC-20KL03A / TC-29KL03A
ADJUSTMENTS
ITEM / PREPARATION PROCEDURE
8- MTS CALIBRATION
STEREO SEPARATING ADJUSTMENT
1. Connect the oscilloscope in TPA42.
2. Connect the RF generator in the tuner terminal.
3. Adjust AVL to ON.
ADJUSTMENT:
1. Select stereo mode in the audio menu.
2. Supply the signal through RF antenna input:
VIDEO: 100 IRE FLAT FIELD, 30% of modulation
AUDIO: 300 Hz, 30% of modulation, stereo (left only)
(70 ± 5 dB, open, 75W, P/S 10dB)
3.Adjust LB SEPARATION (CHK5) so that the sign
visualized in the oscilloscope is minimum.
4. Supply the signal through RF antenna input:
VIDEO: 100 IRE FLAT FIELD, 30% of modulation
AUDIO: 3 kHz, 30% of modulation, stereo (left only) (70
± 5 dB, open, 75W, P/S 10dB)
5. Adjust HB SEPARATION (CHK5) so that the sign
visualized in the oscilloscope is minimum
6. Repeat the steps 2 to 5.
9- PROTECTION CIRCUIT (SHUTDOWN)
OPERATION
1. Supply a CROSS-HATCH signal.
2. Adjust CONTRAST and BRIGHT controls to minimum.
CONFIRMATION:
1. Connect the voLtmeter in TPA22 and confirm that the
voltage is smaller than [A].
2. Connect a DC source in TPA22 and confirm that the
protection circuit doesn't act when the voltage is [B].
3. Confirm that the protection circuit acts with smaller
voltage than [C].
Condition / CRT 20 pol 29 pol
[A] 22,03V 24,12V
[B] 23,02V 24,50V
[C] 25,52V 27,56V
4
1 2 3
3 2 1
Fig. 2
10- FOCUS CALIBRATION
• Assure that the SUB-BRIGHTNESS adjustment has been
done.
1. Supply a Philips or monoscope pattern signal.
2. Adjust MENU OF IMAGE to DYNAMIC NORMAL.
CALIBRATION:
1. Adjust the FOCUS variable resistor for the point of
better adjustment.
 with PHILIPS signal .... take as reference for
adjustment the third vertical line (fig. 1).
 with MONOSCOPE signal in the number 4 (fig.2).
Fig. 1