5. Scan Start Position
•
Place the scan line test chart on the exposure glass as shown on the
previous page.
•
Connect the oscilloscope to the test leads as follows:
Channel 1 to VIDEO (pin 2 - blue wire), channel 2 to VADJ (pin 1 - red
wire), and connect the ground to pin 4 (black wire)
•
Set the oscilloscope scales as follows:
Vertical - CH 1: 0.2 V/unit, CH 2: 2 V/unit; Horizontal - 20
µ
s/unit.
•
Adjust the waveform until it appears as shown in the right-hand dia-
gram. Do this by gently tapping the SBU as shown in the left-hand dia-
gram.
The peak of the VIDEO signal must be within 4 bits of the peak VADJ
signal.
•
Reset the oscilloscope to the original settings and repeat procedure 4
(Scan Line) on the previous page. It may be necessary to recheck pro-
cedures 4 and 5 until the scan line is perfectly positioned.
•
Tighten the SBU securing screws.
H515R556.wmf
H515R046.wmf
Replacem
ent
Adj
u
s
December 21st, 1995
REPLACEMENT AND ADJUSTMENT
SBU ADJUSTMENT
5-39
