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5.1. VOLTAGE CONFIRMATION
Item / preparation
1. +B voltage
Adjustment procedure
1. TPA55: 144.8 ± 1V
2. TPA56: 12 ± 1V
3. TPA57: 9 ± 1V
4. TPA: 2.5 ± 0.25V
5.2. E.H.T CHECK
Item / preparation
1. Receive an RF signal, window or crosshatch pattern.
2. Set the Brightness and Contrast to minimum (0 Beam)
3. Connect the High Voltage Voltmeter to the CRT ANODE CAP.
4. The set should be switched to AV (no input) contrast and brightness
minimum.
Adjustment procedure
1. Check the EHT voltage is (32.0 1.0) kV.
2. Switch from AV mode to TV.
3. With the Brightness and the contrast controls MAX, check that the high
voltage does not drop more than 3.0 kV from the above measurement
with R.F. signal.
5.3. SUB CONTRAST
Item / preparation
1. Receive PAL colour bar pattern
2. Connect oscilloscope to A51 pin 48.
12
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