Panasonic TC-14A04A, Руководство по обслуживанию

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TC-14A04A / TC-20A04A
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5- PAL COLOR OUTPUT SIGNAL ADJUSTMENT
1. Supply a color bar signal and adjust the local frequency.
2. Adjust “IMAGE” to DYNAMIC NORMAL, “CONTRAST” to
63 and “SUB-CONTRAST” to 21.
3. Adjust the “CHANNEL COLOR” level to NORMAL.
4. Set to CHK2 service mode option, press “5” on the remote
control unit and confirm that OSD becomes blue (AKB
turned off).
5. Set ABL to OFF (in CHK2 mode, to access BRT, CONT, S-
CONT or S-TINT).
6. Adjust [A] for 2.3 ± 0.2V through the BRIGHT control variation
in the test point TPL2.
7. Confirm:
CRT 14 inch 20 inch
RGB Contrast 2 DAC 7 DAC
{352} 12 17
8. Fix G-DRIVE GAIN, R-DRIVE GAIN and B-DRIVE GAIN
data in 1FH or 31 DAC.
R-DRIVE GAIN: [SLV(8A), SUB (16)]
G-DRIVE GAIN: [SLV(8A), SUB (17)]
B-DRIVE GAIN: [SLV(8A), SUB (18)]
CALIBRATION:
1. Connect the oscilloscope in TPL2 (G-OUT) with a 10K
Ω
resistor and adjust “CONTRAST”, so that the [ B ] waveform
it is 2.3±0.1V with 14” CRT and 2.6±0.1V with 20” CRT.
2. Adjust “SUB-COLOR” to obtain 2,45±0.1V in [ D ]
according to fig. 1.
3. Connect the oscilloscope in TPL1 (R-OUT) with a 10K
Ω
resistor and confirm that the [ C ] waveform it is 2.45±0.1V
according to fig. 2.
4. Press the key “5” (AKB ON) and confirm that OSD
becomes white.
Fig. 1
A = 2.3 ±0.1Vo-p
B = 2.4±0.1V
D = 2.45±0.1V
Fig. 2
A = 2.3 ±0.2Vo-p
C = 2.45±0.1V
6- NTSC SUB-TINT CALIBRATION
1. Connect the oscilloscope in TPL1 (R-OUT) with a 10K
Ω
resistor.
2. Supply a Rainbow signal (NTSC 3.58 MHz) through
VIDEO IN.
3. Select “IMAGE” to DYNAMIC NORMAL.
4. Select “COLOR FOR CHANNEL” to NORMAL.
5. On CHK2 service mode, press “5” (AKB OFF) and confirm
that OSD becomes blue (AKB turned off).
6. Set ABL to OFF (on CHK2 mode, to access BRT, CONT,
S-CONT or S-TINT).
CALIBRATION:
1. Adjust [C] for 5.0±0.2V through the BRIGHT control
variation (CHK2) according to fig. 1.
2. Adjust SUB TINT-NTSC so that the levels of positions 2,
3 and 4 of Fig. 1 in accordance with the Fig. 2.
3. Set ABL to ON.
4. Press “5” and confirm that OSD becomes white (AKB
turned on).
Fig. 1 Fig. 2
7- PROTECTION CIRCUIT (SHUTDOWN)
CONFIRMATION OF OPERATION
1.
Supply a
crosshatch pattern
signal
and adjust the
CONTRAST and BRIGHT DAC controls to minimum.
(Ibeam=0
µ
A)
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 14” 20”
A 21,6V 22,4V
B 23,4V 23,4V
C 26,1V 26,1V
ADJUSTMENTS
ITEM / PREPARATION PROCEDURE