Philips PM3208 - 5.3.1 Power Supply Low Voltage; 5.3.2 Power Supply High Voltage; 5.3.3 Power Consumption; 5.3.4 CRT Intensity Adjustment

5
PERFORMANCE
CHECK
AND
ADJUSTMENT
PROCEDURE
5-5
5.3 PERFORMANCE CHECK AND ADJUSTMENT PROCEDURE
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
The adjusting elements and measuring pins are given in figures 5.1 and 5.2.
From every adjusting element the item number and the unit where it is located are given,
e.g. VR1006 (VERT PCB).
NOTE: Always use an insulated adjustment tool!
Power supply low voltage
TEST EQUIPMENT _ d.c. voltmeter
SETTING Measure the d.c. voltages at CN1005 (VERT PCB), with respect
to ground.
REQUIREMENTS Check the +12 V at pin 2 (11,88...12,12 V).
Check the — 12 V at pin 3 (11,88...12,12 V).
Check the +5 V at pin 4 (5,00...5,15 V).
Check the +160 V at pin 6 (152...168 V).
ADJUSTMENT Adjust VR1006 ("+ 12 V ADJ" - VERT PCB) for 11,88...12,12 V.
Power supply high voltage
TEST EQUIPMENT _ d.c. voltmeter
High voltage probe
SETTING Measure the high voltage at CN2005 pin 3 (HOR PCB),
with respect to ground.
REQUIREMENTS Check that the voltage is — 1950...— 2050 V.
ADJUSTMENT NO
Power consumption
TEST EQUIPMENT Watt meter
SETTING Power on
REQUIREMENTS Check for a maximum input power of 40 W.
ADJUSTMENT NO
CRT intensity adjustment
TEST EQUIPMENT NO
SETTING Put the INTENS control at 10 o'clock.
ADJUSTMENT Adjust VR3002 ("INTEN" - HOR PCB) for a just visible trace.
CRT focus adjustment
TEST EQUIPMENT NO
SETTING Put FOCUS control at centre position.
ADJUSTMENT Adjust VR2011 ("FOCUS" - HOR PCB) for optimum brightnessof
the spot.
5.3 PERFORMANCE CHECK AND ADJUSTMENT PROCEDURE