Adjustments When The Drive Assys Are Replaced - Pioneer PDP-507XD Service Manual

5

7.6 ADJUSTMENTS WHEN THE DRIVE ASSYS ARE REPLACED

Waveform adjustments required when replacing the following parts of the 50X MAIN DRIVE and
50Y MAIN DRIVE Assys.
Assy Name Ref No.
50X MAIN DRIVE Assy IC1205
IC1204
50Y MAIN DRIVE Assy IC2104
IC2209
IC2208
TIME LAG ADJUSTMENT OF THE CONTROL SIGNAL (SUS-B)
1 Measure the time lag for the SUS-U signal to the SUS-B signal.
2 Check the time lag for the SUS-B GATE signal to the SUS-U GATE siganl.
Adjust the variable control so that the time lag of GATE becomes " time lag of input signal + α ± 5 nsec."
Note: For details on measuring points of waveform, see the figure below.
SUS-U signal (input to the DRIVE Assy)
SUS-B signal (input to the DRIVE Assy)
SUS-U signal (input to the DK module)
SUS-B GATE signal
50X MAIN DRIVE (GATE signal of Q1210)
50Y MAIN DRIVE (GATE terminal of Q2210)
time lag of SUS-U gate and SUS-B gate : ∆ Tsus-gub
Adjust so that "∆ Tsus-gub = ∆ Tsus-iub + α ± 5 nsec," using the variable
controls shown in the table below:
5
6
Part Name
PS9117P
TND307TD
TND307TD
PS9117P
TND307TD
50 % of the crest value
time lag of SUS-U and SUS-B
∆ Tsus-iub
Assy
50X MAIN DRIVE ASSY
VR1001
50Y MAIN DRIVE ASSY
VR2001
PDP-507XD
6
7
Part Category
Photo Coupler
FET Driver
FET Driver
Photo Coupler
FET Driver
50 % of the crest value
50 % of the crest value
time lag of SUS-U GATE and SUS-B GATE
∆ Tsus-gub
Value of α
VR
70 nsec
50 nsec
7
8
Remarks
50 % of the crest value
8
A
B
C
D
E
F
125