Before Replacing The Dc Controller Pcb; After Replacing The Dc Controller Pcb; When Replacing The Ram Pcb; Laser Exposure System - Canon imageRUNNER 1750 Series Service Manual

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Adjustment > Adjustment when Replacing the Parts > Laser Exposure System > After Replacing the Laser Scanner Unit

■ Before Replacing the DC Controller PCB

1) Request the user to backup the user data using remote UI.
2) If possible, output the data of the unprocessed jobs.
After replacing the DC Controller PCB, the data of the unprocessed jobs will be deleted.
3) Print out the list of the service mode setting value in the service mode.
REPORT> REPORT OUTPUT> SERVICE DATA LIST

■ After Replacing the DC Controller PCB

1) When replacing the DC Controller PCB with a new one, be sure to perform the following
procedure.
• Download the latest firmware using UST.
(Refer to Software to Be Upgraded and Upgrading Method)
2) Clear the DC Controller setting value/counter.
Service mode > CLEAR > ENGINE > ENGINE BKRAMCLK
(Clearing RAM of the DC Controller PCB)
3) Turn OFF and then ON the power.
(By turning OFF and then ON the power, RAM clear is executed.)
4) When backup data cannot be uploaded before replacement due to reasons such as
damage of the DC Controller PCB, enter the value of each #PRINT item described on the
service label.
Since the values recorded on the service label may not be the latest at this time, check the
service mode item list (#SERVICE DATA LIST) printed out in advance, and enter the values
on the list.
5) Turn OFF and then ON the main power.
(By turning OFF and then ON the power, the value entered in each service mode item
becomes enabled.)
6) Upon completion of the replacement work, request the user to restore the user data.

■ When Replacing the RAM PCB

CAUTION:
Even after turning OFF the main power switch and disconnecting the power plug from
the outlet, power is still supplied between SO-DIMM and Secondary Battery Unit for
backup of the image memory. When the SW3 of the Main Controller PCB is pressed
while image is backed up, all the contents in the memory are cleared, therefore be sure
to output all data in the memory before pressing it.
5 Adjustment > Adjustment when Replacing the Parts > Laser Exposure System > After Replacing the Laser Scanner Unit

Laser Exposure System

■ After Replacing the Laser Scanner Unit

When replacing the Laser Unit, enter the value obtained by adding 1,000 to the number
shown on the label affixed to the side of the newly replaced Laser Unit in the corresponding
service mode as shown below.
(Examples: If the number on the service label is 3, enter 1,003. If the number on the service
label is -1, enter 999.)
SW No. 145 146 147
PRINT > PRINT NUMERIC >
136 Laser horizontal scanning direction write position adjustment (A)
PRINT > PRINT NUMERIC >
145 Laser horizontal scanning direction magnification ratio adjustment (A-B)
PRINT > PRINT NUMERIC >
146 Laser horizontal scanning direction magnification ratio adjustment (A-C)
PRINT > PRINT NUMERIC >
147 Laser horizontal scanning direction magnification ratio adjustment (A-D)
PRINT > PRINT NUMERIC >
148 Laser horizontal scanning direction write position adjustment (A-B)
PRINT > PRINT NUMERIC >
149 Laser horizontal scanning direction write position adjustment (A-C)
PRINT > PRINT NUMERIC >
150 Laser horizontal scanning direction write position adjustment (A-D)
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136 148 149 150
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