Muratec MFX-C4000, Field Engineering Manual

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Alignment & Troubleshooting
Service Manual
4-78
4.2.3 System Diagnostic
Problem Description Cause Description Action to Resolve
Low Image Density
for a Particular Color
1. Low Toner
Concentration
2. High OPC Surface
Potential
3. Poor T1 Transferring
[1. Low Toner Concentration]
1.1) Print out CTD check page [EDC #117-0001].
1.2) If the output has low toner concentration, execute CTD
calibration [EDC #117-0000], and print CTD check page
again.
1.3) If the toner concentration is still low, go to [DE-003] Failure
in CTD Calibration.
[2. High OPC Surface Potential]
2.1) Check and confirm MHV Bias for the color [TM #105-
0000~0016].
2.2) If there is any wrong value, change the value [TM #105-
0000~0016].
2.3) Turn on the Charging Bias for the color [EDC #105-
0000~0003]
2.4) Read the MHV value for the color [EDC #105-0004~0007]
2.5) If any mis-reading on the MHV value, replace HVPS-L PBA.
[3. Poor T1 Transferring]
3.1) Check and confirm THV1 Bias for the color [TM #107-
0000~0007]
3.2) If there is any wrong value, check and confirm the contact
point between the rear side of ITB and frame.
3.3) Read the THV1 value for the color [EDC #107-0000~0003]
3.4) If any mis-reading on the MHV value, replace HVPS-L PBA.
Low Image Density
for All Colors
1. Poor T2 Transfer
2. Wrong CTD Sensing
[1. Poor T2 Transfer]
1.1) Check and confirm THV2 Bias for the color [TM #107-
0008~0009]
1.2) If there is any wrong value, check and confirm the contact
point of T2 driving roller in side unit.
1.3) Read the THV2 value for the color [EDC #107-0004~0007]
1.4) If any mis-reading on the THV2 value, replace HVPS-L
PBA.
Vertical Irregular
Image Density for a
Particular Color
1. Unbalanced
Metering Blade Gap
2. Unbalanced
Developer
Distribution at
Developing Gap
[1. Unbalanced Metering Blade Gap]
1.1) Replace the Imaging unit.
[2. Unbalanced Developer Distribution at Developing Gap]
2.1) Replace the Imaging unit.