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TC-14A12P / TC-20B12
NTSC SUB-TINT CALIBRATION
1. PREPARATION:
1.1. Connect the oscilloscope to TPL1 (R OUT) in serie with a
10K resistor.
1.2. Receive a rainbow pattern through VIDEO IN.
1.3. Adjust "IMAGE" to DYNAMIC NORMAL.
1.4. Adjust "COLOR FOR CHANNEL" to NORMAL.
1.5. Set the CHK2 service mode option, press "5" on the remote
control unit and confirm that OSD becomes blue (AKB turned off).
1.6. Connect a short circuit jumper between TPA10 and TPA20.
2. CALIBRATION:
2.1. Adjust [C] for 5.0±0.2V through the BRIGHT control variation
according to fig. 1.
2.2. Adjust the NTSC SUB-TINT level according to fig. 1 positions
2, 3 and 4.
2.3. Remove the jumper , press "5" and confirm that OSD becomes
white (AKB turned on).
1
2
3
C
0V
PROTECTION CIRCUIT (SHUTDOWN)
CONFIRMATION OF OPERATION
1. PREPARATION:
1.1. Receive a crosshatch pattern.
1.2. Adjust CONTRAST and BRIGHT controls to minimum.
2. CONFIRMATION:
2.1. Connect the voltmeter in TPA22 and confirm that the voltage
is smaller than [A].
2.2. Connect a DC source in TPA22 and confirm that the protection
circuit doesn't act when the voltage is [B].
2.3. Confirm that the protection circuit acts with smaller voltage
than [C].
Condition
14 inches
A
19,67V
B
20,66V
C
22,49V
4
5
6
7
8 9
10
Fig. 1
Fig. 2
20 inches
21,18V
22,31V
24,37V
WHITE QUALITY CALIBRATION
1. PREPARATION:
1.1. Adjust the HELMHOLTZ device to local magnetic field. Hori-
zontal: 0 ± 0.003 X 10-4T
1.2. Receive a white purity pattern.
1.3. Adjust CONTRAST and BRIGHT controls to maximum.
1.4. Previously adjust the CONVERGENCE.
1.5. Fully degauss the CRT by using an external degaussing coil.
2. CALIBRATION:
2.1. Adjust the magnetic field in 0.4x10-4T (400 mG), and check
the white quality with the CRT turned to EAST and to WEST.
2.2. Receive a red pattern, adjust the COLOR control to maximum
and confirm the purity adjustment.
2.3. If purity error is found at the CRT corners, to apply magnetic
tapes to correct it, fully degauss the CRT again and repeat the
steps 1 and 2. Don't use this magnetic tapes on the internal side
of the yoke.
2.4. Receive a white purity pattern, adjust the COLOR control to
maximum and confirm the purity adjustment.
VERTICAL DEFLECTION
CALIBRATION AND CONFIRMATION
1. PREPARATION:
1.1. Adjust the HELMHOLTZ device to the local magnetic field
1.2. Adjust IMAGE to DYNAMIC NORMAL.
2. CONFIRMATION AND CALIBRATION S-CORR :
• CONFIRMATION IN 50HZ
2.1. Receive a PAL-N Philips pattern
2.2. Confirm that S-CORR 50Hz is in [18] DAC.
• CONFIRMATION IN 60HZ
2.3. Receive a monoscope pattern.
2.4. Confirm that S-CORR 60Hz is in [18] DAC.
• V-SLOPE CALIBRATION
2.5. Receive a monoscope pattern.
2.6. Adjust V_SLOPE so that the beginning of the black part of
the image be aligned with the center of the CRT as below.
3. VERTICAL CENTRALIZATION 50 HZ CALIBRATION
3.1. Receive a PAL-N Philips pattern
3.2 Adjust V-SHIFT 50Hz so that Philips pattern's center it is in
the CRT center.
4. VERTICAL CENTRALIZATION 60 HZ CALIBRATION
4.1. Receive a monoscope pattern.
4.2. Adjust V-SHIFT 60Hz so that the monoscope pattern's it is in
the CRT center
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