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GMA050702 

Sharp Electronics (UK) Ltd., Technical Services Group

 

 

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Install the upgraded firmware. Confirm upgrade by using Sim. 22-05. 

  

(Toner density will not change immediately).  

• 

Use Test Sim.64-01 (Pattern13,Density 255, Multi Count 20 CMYK) to 

     reduce 

toner 

concentration. 

• 

Power cycle the copier and execute Test Sim 44-06. 

• 

Re-calibrate the engine using Test Sim 46-24. 

Before carrying out any calibration, ensure the following adjustments have 

 

 

 

 

been checked (especially when either drums or developer have been replaced) 

Verify that both DV & MC Grid bias voltages are adjusted to factory specification:- 
 
Developing Bias Voltage 
 

 
 
Note: If the MC Grid Bias setting is lowered to reduce the “Halo effect”, the 
background level may be increased. 
 

GMA050702 

Sharp Electronics (UK) Ltd., Technical Services Group

 

 

Select Print Mode A = 1 and Paper E = 5 if A3 paper is available from CAS4. 

 

 

 

 

 
Press “EXECUTE” to output 8 numbered test patterns. Choose the pattern number 
with the least deflection for Cyan, Magenta & Yellow, and enter the pattern number 
values into locations “B”, “C” & “D”. 
 
[Refer to AR-C150 S/M 7-8] 
 
 
Colour Registration (Main & Sub Scan 
 
Execute Test Simulation 50-22  Auto Registration adjustment or Test Simulation(s) 
50-20 (Main scan) & 50-21 (Sub scan) for manual adjustment of colour registration. 
 
 
Test Simulation 50-22 
 
Press “EXECUTE”. to output a check pattern. Check that the greatest density 
of Cyan and Magenta in MSF/MSR (check pattern 1) is within 1 step of the 
black triangle. 
 
Also, check that the print lines of Cyan, Magenta, and Yellow align with the 
black print lines in check patterns MSF/MSR/SS check pattern 2. 
 

 

GMA050702 

Sharp Electronics (UK) Ltd., Technical Services Group

 

 

 
If acceptable and within specification, exit Test Simulation 50-22.  
 
If out of specification, place the check pattern on the platen glass with the 
arrow pointing left, placing 5 sheets of blank paper on top.  
 
Press “EXECUTE”.  
 
The pattern will be scanned, and the display will show a result of “EXACT”, 
“ROUGH”, or “ERROR”. Exit the simulation by using C/A. 
 
“Recheck and “Fine Tune” the Registration by using Test Simulation 50-20 
(Main scan) and 50-21 (Sub scan). 
 
 
Copy Exposure 
 
Test Simulation 46-01 & 46-02 
 
Prior to adjusting colour balance, adjust all Colour and B/W exposure settings 
back to the default value of 50 :- 

 
 

 

 

 

 

 
 

 

 

 

 
 

Ensure Half Tone Correction is reset back to default ONLY when either Drum(s) or 

 

Developer are replaced. 

   

 

 

 
 

 

 

 

 

Select  A3 paper and press “EXECUTE” to print a half tone test pattern (This 
should be printed on recommended colour paper). Place this pattern onto the 
platen glass so that the darkest density patches are toward the left or exit side of 
the copier. Place 5 sheets of blank paper on top of the test pattern for greater 
accuracy.  

GMA050702 

Sharp Electronics (UK) Ltd., Technical Services Group

 

 

 

 

 

 

The colour test pattern will be scanned, and a reference patch image will be printed.  
Examine the image and determine the following: 
  

1)  The maximum density area is not blurred or distorted. 

2)  Patch “A” of Y, C, M, and K is not visible. 

3)  Patches “B through E” are very faint. (“B” & “C” not visible is acceptable) 

4)  The patch density for each colour should change gradually from high 

density (left) to low density (right).