Ricoh FACSIMILE FAX77 Field Service Manual page 122

Step Item
5 Reduction
rate
Procedure
1. Access the SBU as explained in
"Preparation" above.
2. Set the oscilloscope scale to 0.2
V/unit (vertical) and 0.5 ms/unit
(horizontal).
3. Connect the oscilloscope probe to
XVIDEO (pin 1 - blue wire) and the
ground to GND (pin 4 - black wire)
on the test lead.
4. Light the xenon lamp (see page 2-
24).
5. Place the 8 line/mm test pattern on
the exposure glass.
6. Loosen the lens block securing
screws [A].
7. Move the lens block [B] back and
forth until the signal has 8 or fewer
crosspoints.
8. Tighten the lens block securing
screws.
Note: Tighten each screw little by lit-
tle alternately.
3-17