Philips for Intel Socket 775 processor Service Manual page 35

How to adjust waveform
8.1.2 42" SDv3
V3.1 TCP Ramp Waveform Inclination Adjustment (Y-Board)
Adjust VR5002 to set the time of
Yrr (Rising Ramp) 10
Adjust VR5003 to set the time of
Yfr (Falling Ramp_1st) 30
Procedure
1) Make Full White on Screen.
2) Observe waveform using Oscilloscope.
check OUT4 TP in Y-buffer(upper).
Observe the waveform of the third waveform of 1TV-Field.
Adjust the division of oscilloscope like the left picture
Adjust the period of
VR for Vset : VR5003 (Y_main)
VR for -Vsc(1) : VR5001 (Y_main)
VR for -Vsc(2) : VR5002 (Y_main)
rising maintance time
falling maintance time
Aligments S/SD/HD 3.1 PDP
Vset as 10µS,
that of -Vsc(1) as 20µs,
that of -Vsc(2) as 5µs,
turning VR (Variable Resistor)
(only,when you adjust each period of -Vsc(1) & -Vsc(2)
adjust Vertical Division of oscilloscope as '2V or 5V')
Adjust VR5004 to set the voltage of
Vsch (Scan high voltage) 40 V
Adjust VR5001 to set the time of
Yfr (Falling Ramp_3rd) 30
8. EN 35