Pioneer PDP-5030HD Product Training Manual page 45

SUS-B Ground Timing Adjustment
It is necessary to adjust when replacing the X or Y DRIVE Assy and the pulse module.
Measurement point and method
Measurement point of waveform of X and Y DRIVE Assy in timing adjustment is test pin of SUSOUT of the pulse module of
bottom of the main unit.
X DRIVE Assy : K3106
Measurement screen : Black mask (PC 60Hz)
The measurement is easy to perform when turns field AB alternation to OFF. (RS-232C command: OCN)
Measure a sustain pulse of the fifth pulse (X DRIVE) and the fifth pulse (Y DRIVE) from the back of the fourth FS, and
adjust. In the start section of this sustain pulse, waveform has inflection point with the timing when SUS-B becomes ON.
Adjust so that the voltage of this inflection point is the nearest to 140V and do not become less than 140V.
Adjustment parameter
X DRIVE: XSUSB (RS-232C command : XSB)
Y DRIVE: YSUSB (RS-232C command : YSB)
Note:
• Connect GND of probe measuring waveform to SUSGND terminal by all means.
• Precise waveform is not displayed, and an adjustment gap may occur that does not collect GND properly.
Waveform in the measurement
140V Line
GND
This broken section moves by
changing the adjustment
parameter.
PDP-433PU
Y DRIVE Assy : K2203
Rst 1SF
1ms/div
Magnify 5FS block
5µs/div
Magnify the fourth pulse sustain pulse (XSUSOUT waveform) from the back of the above waveform.
100nsec/div
50V/div
2SF 3SF 4SF 5SF
CH1 : Y SUSOUT (K2203), 50V/div
CH2 : X SUSOUT (K3106), 50V/div
CH4 : YPR-U1 (K2038)- Trigger, 5V/div
Trigger : 2msec delay
Measure a waveform of this section and adjust.
140V Line
100nsec/div
50V/div
Become less than 140V.
→ NG
45.