03/02 1.1 Trimming
WorkCentre 423/428 1-3 CHAPTER 1 SERVICE CALL PROCEDURE
1.1 Trimming
Perform trimming on WorkCentre Pro 423/428 at eachservice call. This helps to
maintain optimum machine performance.
1.1.1 Trimming Procedure
1. Pre-work check
l Make several copies of the test chart (499T247) and check the copy quality.
l Make a black copy (Chain: 23, Function: 11) and a blank copy (Chain: 23,
Function: 10) in Diagnostic. (C/E) mode.
Black copy: Check for no darknessirregularity or fusing fault.
Blank copy: Check for no drum scratch or smearing.
2. Machine internal cleaning
l Wipe off toner and paper dust from the paper path. (Clean the operating
section especially well.)
3. IIT cleaning
l Clean the platen glass (front surface) and platen cushion with a lint-free
cloth.
l Clean the reflector, platen glass (back surface), mirror, and lens with a lint-
free cloth.
4. DADF cleaning
l Clean the Pickup Roll, Separation Roll, and Platen Glass with a damp cloth.
5. Check the history of periodic replacement parts (consumable parts) and
replace necessary parts.
l The history can be checked in Diagnostic. (C/E) mode.
6. Safety check
l Check the power plug for secure connection and the power cord and plug
for no damage.
7. Post-work check
l Check the mechanical operations.
l Check the copy quality.
l Check the counters.
1.1.2 Consumables and consumable parts
For consumables and consumable parts, check the history of copying and feeding at
trimming and replace necessary items. The history can be checked in Diag. (C/E)
mode. (See Chapter 2, "Diagnostic Mode.")
<Drum Unit>
Consumables Replacement interval Remarks
Drum Unit 24K prints A message is displayed when
replacement is due
<Main Unit>
Consumable parts Replacement interval Remarks
Tray 1 (Feed Roll) 600K feed After replacement, clear the Tray 1 feed
counter. (Chain:30 Function:6)
Tray 1 (Retard Roll) 600K feed After replacement, clear the Tray 1 feed
counter. (Chain:30 Function:6)
Tray 2 (Feed Roll) 600K feed After replacement, clear the Tray 2 feed
counter. (Chain:30 Function:7)
Tray 2 (Retard Roll) 600K feed After replacement, clear the Tray 2 feed
counter. (Chain:30 Function:7)
Tray 3 (Feed Roll) 600K feed After replacement, clear the Tray 3 feed
counter. (Chain:30 Function:8)
Tray 3 (Retard Roll) 600K feed After replacement, clear the Tray 3 feed
counter. (Chain:30 Function:8)
Tray 4 (Feed Roll) 600K feed After replacement, clear the Tray 4 feed
counter. (Chain:30 Function:9)
Tray 4 (Retard Roll) 600K feed After replacement, clear the Tray 4 feed
counter. (Chain:30 Function:9)
MSI (Feed Roll) 600K feed After replacement, clear the MSI feed
counter. (Chain:30 Function:12)
MSI (Retard Roll) 600K feed After replacement, clear the MSI feed
counter. (Chain:30 Function:12)
Fuser Assy 200K copying
BTR 200K copying
<DADF>
Consumable parts Replacing interval Remarks
Pickup Roll
90K feed Number of sheets scanned by DADF
(Chain:30 Function:3)
Feed Roll 90K feed Number of sheets scanned by DADF
(Chain:30 Function:3
Separation pad
90K feed Number of sheets scanned by DADF
(Chain:30 Function:3)
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