美能达5501/6501报错代码C-4520，C4520解决方法
Cause
Colour registration adjustment failure
Resolution
Step 1.
C-4520
Step 2.
Toner Density Revert
1. Power the machine OFF from the main switch leaving the sub switch ON.
2. Turn main power switch ON while pressing the Utility/Counter key. Keep holding it till the comes up in Service mode.
3. -02 Select process adj
4. -02 Select drum peculiarity
5. -06 Select toner density revert - run that routine. All values need to be circa 1.26
for 5500/6500 - should be under sensor output check - density return mode
max density sensor
6. Press the [Return] key, which is displayed on the touchscreen.
7. Exit Service mode to return to normal operation
Gamma Automatic Adjustment
1. Power the machine OFF from the main switch leaving the sub switch ON.
2. Turn main power switch ON while pressing the Utility/Counter key. Keep holding it till the comes up in Service mode.
3. -02 process adjustment
4. -06 recall standard data
5. -02 drum peculiarity
6. -06 toner revert all on
7. -02 gamma automatic adjust (wait for procedure to complete)
Colour Registration Adjustment
1. -01 Machine Adjustment
2. -01 Printer Adjustment
3. -10 Colour Registration Adjustment (wait for operation to complete)
4. - When completed exit out of service mode.
Exit out of service mode and go into adjustment at the bottom of the screen.
1. -03 execute adjust operation
2. Select toner refresh mode press ok. 苏州美能达打印机维修站电话696l6769，企业一站式服务，上门维修，耗材配送

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