Pioneer PDP-4280HD Service Manual page 135

5
DELAY ADJUSTMENT OF THE CONTROL SIGNAL (SUS-D)
1 Measure the pulse width of the SUS-D signal.
2 Check the pulse width of the SUS-D input signal (gate terminal of Q2112).
Adjust the variable control so that the pulse width of the SUS-D input signal (gate terminal of Q2112) becomes the
same pulse width ± 5 nsec as the SUS-D signal.
Note: For details on measuring points of waveform, see the figure below.
SUS-D signal
(input to the DRIVE Assy)
SUS-D signal
(input to the gate terminal of Q2112)
SUS-D pulse width: Tsus - Dg
Adjust so that "Tsus - Dg = Tsus - D ± 5 nsec," using the variable
control shown in the table below:
Y DRIVE Assy
5
6
SUS-D pulse width
50 % of the crest value
50 % of the crest value
Assy VR
VR2001
6
7
Tsus - D
50 % of the crest value
SUS-D pulse width
Tsus - Dg
PDP-4280HD
7
8
50 % of the crest value
8
A
B
C
D
E
F
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