Pioneer PDP-4280HD, Service Manual

Page: 135 / 176

PDP-4280HD
135
5 6 7 8
5 6
7
8
C
D
F
A
B
E
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.
50 % of the crest value 50 % of the crest value
50 % of the crest value 50 % of the crest value
SUS-D pulse width: Tsus - Dg
Adjust so that "Tsus - Dg = Tsus - D
±
5 nsec," using the variable
control shown in the table below:
SUS-D signal
(input to the DRIVE Assy)
SUS-D signal
(input to the gate terminal of Q2112)
SUS-D pulse width
Tsus - D
SUS-D pulse width
Tsus - Dg
Assy VR
Y DRIVE Assy VR2001