Adjustment When The Drive Assys Are Replaced - Pioneer PDP-5010FD Service Manual

5

8.5 ADJUSTMENT WHEN THE DRIVE ASSYS ARE REPLACED

Waveform adjustments required when replacing the following parts of the X DRIVE and Y DRIVE Assys.
Assy Name Ref No.
X DRIVE Assy IC1101
IC1104
IC1204
IC1209
Y DRIVE Assy IC2101
IC2103
IC2104
IC2201
IC2203
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 Gate signal
X DRIVE (Gate terminal of Q1109)
Y DRIVE (Gate terminal of Q2107)
SUS-B Gate signal
X DRIVE (Gate terminal of Q1220)
Y DRIVE (Gate terminal of Q2217)
Time lag of SUS-U Gate and SUS-B Gate : Δ Tsus - gub
Adjust so that "Δ Tsus - gub = Δ Tsus - iub + α ± 5 nsec," using the variable
controls shown in the table below:
5
6
Part Name
PS9117AP
TND307TD
PS9117AP
TND307TD
PS9117AP
TND307TD
TND307TD
PS9117AP
TND307TD
50 % of the crest value
time lag of SUS-U and SUS-B
Δ Tsus-iub
Assy VR
X DRIVE Assy
VR1002
Y DRIVE Assy
VR2002
PDP-5010FD
6
7
Part Category
Photo Coupler
FET Driver
Photo Coupler
FET Driver
Photo Coupler
FET Driver
FET Driver
Photo Coupler
FET Driver
50 % of the crest value
5 V position
time lag of SUS-U Gate and SUS-B Gate
Δ Tsus - gub
Value of α
70 nsec
60 nsec
7
8
Remarks
5 V position
8
A
B
C
D
E
F
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