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

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7.5 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.
A
Assy Name Ref No.
50X MAIN DRIVE Assy IC1205
IC1204
50Y MAIN DRIVE Assy IC2104
IC2209
IC2208
B
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.
C
SUS-U signal (input to the DRIVE Assy)
SUS-B signal (input to the DRIVE Assy)
D
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)
E
F
144
1
2
Part Name
PS9117P
TND307TD
TND307TD
PS9117P
TND307TD
50 % of the crest value
time lag of SUS-U and SUS-B
∆ Tsus-iub
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:
Assy
50X MAIN DRIVE ASSY
50Y MAIN DRIVE ASSY
PDP-507CMX
2
3
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
VR1001 70 nsec
VR2001 50 nsec
3
4
Remarks
50 % of the crest value
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