Canon MultiPASS C755 Service Manual - Page 53

MultiPASS C755, Maintenance & Service, 3 Periodic Inspection - print head

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MultiPASS C755 Chapter 3: Maintenance & Service 1.3 Periodic Inspection None 1.4 Periodic Replacement Parts None 1.5 Adjustment Items The following adjustments must be made on this fax. For the adjustment procedure, see 3. ADJUSTMENT on page 3-6. Item When CS LED lights-on duration When the SCNT board, or the lithium battery, or the contact adjustment sensor are replaced. Also, when the color or brightness of the copy image or transmission image is not normal. Vertical Alignment When the vertical lines shift during Bi-directional printing. adjustment Carriage belt tension adjustment When reinstalling the idler pulley. ASF gear initial position adjustment When reinstalling the ASF unit. Head gap adjustment When loosening the screws fixing the head-to paper distance. NOTE Automatic adjustment of CS LED lights-on duration The CS LED lights-on duration, which can be adjusted via button operation, is also adjusted automatically in the following cases: • When power is turned ON then SRAM data is corrupted When this product is shipped, after factory adjusment of the CS LED light-on duration, the exposure control data is stored in SRAM. Because this data is preserved by the Lithium battery even if the power supply is shut off, further adjustment is unnecessary in almost all cases. When the machine's power switch is turned on, the data stored in SRAM is checked for correctness by Checksum, and if any data in SRAM has been lost, adjustment of CS-LED lights-on duration is automatically performed at that time. At first, a check is done for the presence/absence of a document, and if there is no document, exposure control is performed automatically. Exposure control data measured after this is stored in SRAM. When a document is present, scanning is done in an error condition, an abnormal image is output, and the contact sensor is aware that there is an abnormality. 3-2

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3-2
MultiPASS C755
Chapter 3: Maintenance & Service
1.3 Periodic Inspection
None
1.4 Periodic Replacement Parts
None
1.5 Adjustment Items
The following adjustments must be made on this fax.
For the adjustment procedure, see
3. ADJUSTMENT on page 3-6.
Item
When
CS LED lights-on duration
When the SCNT board, or the lithium battery, or the contact
adjustment
sensor are replaced. Also, when the color or brightness of the copy
image or transmission image is not normal.
Vertical Alignment
When the vertical lines shift during Bi-directional printing.
adjustment
Carriage belt tension adjustment
When reinstalling the idler pulley.
ASF gear initial position adjustment
When reinstalling the ASF unit.
Head gap adjustment
When loosening the screws fixing the head-to paper distance.
Automatic adjustment of CS LED lights-on duration
The CS LED lights-on duration, which can be adjusted via button operation, is also
adjusted automatically in the following cases:
• When power is turned ON then SRAM data is corrupted
When this product is shipped, after factory adjusment of the CS LED light-on
duration, the exposure control data is stored in SRAM.
Because this data is preserved
by the Lithium battery even if the power supply is shut off, further adjustment is
unnecessary in almost all cases.
When the machine’s power switch is turned on, the
data stored in SRAM is checked for correctness by Checksum, and if any data in
SRAM has been lost, adjustment of CS-LED lights-on duration is automatically
performed at that time.
At first, a check is done for the presence/absence of a
document, and if there is no document, exposure control is performed automatically.
Exposure control data measured after this is stored in SRAM.
When a document is
present, scanning is done in an error condition, an abnormal image is output, and the
contact sensor is aware that there is an abnormality.
NOTE