Pioneer PDP-5020FD User Manual

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PDP-5020FD
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8.5 ADJUSTMENT WHEN THE DRIVE ASSYS ARE REPLACED
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: • Be sure to set the Drive to OFF for adjustment.
• For details on measuring points of waveform, see the figure below.
50 % of the crest value
5 V position
5 V position
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:
SUS-U signal (input to the DRIVE Assy)
SUS-B signal (input to the DRIVE Assy)
SUS-U signal
SUS-B signal
X DRIVE (Gate terminal of Q1219)
Y DRIVE (Gate terminal of Q2218)
X DRIVE (Gate terminal of Q1108)
Y DRIVE (Gate terminal of Q2107)
50 % of the crest value
time lag of SUS-U and SUS-B
Δ Tsus-iub
time lag of SUS-U Gate and SUS-B Gate
Δ Tsus - gub
Assy VR
Value of α
X DRIVE Assy
VR1002 60 nsec
Y DRIVE Assy
VR2002 60 nsec
Waveform adjustments required when replacing the following parts of the X DRIVE and Y DRIVE Assys.
Assy Name Ref No. Part Name Part Category Remarks
X DRIVE Assy IC1101 PS9818-1(P) Photo Coupler
IC1104 TND307TD FET Driver
IC1204 PS9818-2(P) Photo Coupler
IC1209 TND307TD FET Driver
Y DRIVE Assy IC2101 PS9818-1(P) Photo Coupler
IC2103 TND307TD FET Driver
IC2201 PS9818-1(P) Photo Coupler
IC2203 TND307TD FET Driver

Pioneer PDP-5020FD Specifications

General

Brand	Pioneer
Model	PDP-5020FD
Category	Flat Panel TV
Language	English