System Diagnostic - Muratec MFX-C4000 Field Engineering Manual

4.2.3 System Diagnostic

Problem Description
Low Image Density
for a Particular Color
Low Image Density
for All Colors
Vertical Irregular
Image Density for a
Particular Color
Service Manual
Alignment & Troubleshooting
Cause Description
1. Low Toner
Concentration
2. High OPC Surface
Potential
3. Poor T1 Transferring
1. Poor T2 Transfer
2. Wrong CTD Sensing
1. Unbalanced
Metering Blade Gap
2. Unbalanced
Developer
Distribution at
Developing Gap
Action to Resolve
[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.
[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.
[1. Unbalanced Metering Blade Gap]
1.1) Replace the Imaging unit.
[2. Unbalanced Developer Distribution at Developing Gap]
2.1) Replace the Imaging unit.
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