Sharp Z-21, Руководство по обслуживанию

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[10] ADJUSTMENTS
1. Lead edge image loss adjustment
The lead edge adjustment is performed in the following cases:
•
When the main PWB is replaced.
•
When the EEPROM is replaced.
•
When the power unit is replaced.
@
Even in the other cases, when the drive section or the paper feed
section is disassembled or when some parts in those sections are
replaced, check copy quality.
Use a simulation to perform the lead edge adjustment. Use the same
simulation to perform the copy exposure adjustment.
The simulation procedure is as shown below:
Flow Chart of lead edge and exposure adjustment
Turn off the power and remove the
seal cover in the paper exit side
Short JP210 and JP211, and turn
on the power
Misfeed lamp lights up to
allow lead edge adjustment
A
[Lead egde adjustment mode]
Turn VR202
Misfeed lamp blinks
Perform lead edge adjustment
with VR202
Copy exposure key ON
Copying can be performed
Copy check
NG
OK
The toner lamp lights up to allow
manual exposure adjustment with
VR202
The toner lamp blinks
Turn VR202
[Manual exposure adjustment mode]
[Auto exposure adjustment mode]
Turn on the copy exposure key
Copy exposure key ON
Light exposure
lamp lights up and the
auto exposure mode adjustment
is performed
The auto
exposure lamp blinks
Copying can be performed
Cpoy exposure key ON (once)
(Auto exposure mode)
[Copy exposure adjustment mode]
Copy check
The auto exposure lamp lights up
allow auto exposure manual
adjustment with VR202
NG
OK
[Auto exposure manual adjustment mode]
Turn VR202
Copy exposure key ON
Copy check
Trouble detection
All exposure lamps blink
OK
[Copy exposure adjustment mode]
Turn on the copy exposure key
NG
OK
Turn off the power, release short
of JP201 and JP211 on the main
PWB
Misfeed lamp blinks
Simulation end
Attach the seal cover to the paper
exit side, and turn on the power
End
Shift to the lead edge adjustment
or exposure adjustment simulation
A
VR202: Center position
Counterclockwis Clockwise
Center
For each adjustment value, ±5 steps can be adjused with the
center as the reference
(Turning the VR about 15 degrees changes 1 step of the set value.)
Cpoy exposure key ON (twice)
(Standard manual mode)
@
To light the lamp from blinking state, the VR must be turned more
than 2 steps clockwise or counterclockwise. First turn the VR
more than 2 steps clockwise or counterclockwise and check that
the lamp lights up. Then perform adjustments.
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