Canon LBP-860 Service Manual page 150

CHAPTER 6
Printer Driver Tester
A.
Figure 6-l
1. Outline
The printer driver tester allows lhe printer
to operate without being connected to an
interface to determine whether the printer
is operating normally.
The tester has the following two functions:
a. It permits the printer Lo print a black
image. horizontal or vertical lines. or a
w h i t e i m a g e t o b e i n g d e t e r m i n e
whether the trouble is caused by the
printer or by the video controller
(external device].
b. It operates the laser in the printer.
Measure the output voltage [APCIN
signal). which is proportional to the
intensity of the laser beam, with a
digital multimeter and confirm that the
output voltage is within the stipulated
range.
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2. Description of control panel
Figure 6-2
TEST PRINT
Permits the printer to print the pattern
specified by VIDEO SELECT.
VIDEO SELECT
Selects the test pattern to be printed:
black hnage, vertical lines, horizontal lines,
or a white image.
PAPER FEED METHOD SELECT
Picks up the paper or the envelope from
one of the following:
Upper cassette
l
Lower casselte (cassette feeder)
l
Envelope feeder
l
READY CONTROL
ON places the printer in a READY state
when the power is ON, even if one of the
following conditions is present (the READY
INHIBIT mode).
No cartridge
l
No paper
l
Paper jam
l
l
W h e n turning
CONTROL switch ON to set the
tester to the READY INHIBIT mode,
connect the tester to the printer
before turning ON the printer
switch. To cancel this mode,
disconnect the tester and then
turn the printer switch OFF/ON.
Connecting the tester with its
READY CONTROL switch ON to the
on-line printer causes the printer
to enter the READY INHIBIT mode,
the R E A D Y