AR-C150 (serv.man42). Troubleshooting Copy Quality - Sharp Copying Equipment Technical Bulletin (repair manual). Page 6

GMA050702 

Sharp Electronics (UK) Ltd., Technical Services Group

 

 

 

If the colour patch is judged to be abnormal, select “Repeat” to reprint the test 
pattern. 

 

 
 
Once the test pattern is rescanned and the colour patch is judged to be normal, 
press OK. Wait until the message “Please Quit This Mode” is displayed before 
exiting the test simulation. 
 
After completion of this command, make test copies using the Sharp Colour Test 
Chart (UKOG-0283FCZZ) and confirm copy quality. If the customer is satisfied with 
the quality, calibration is complete. 

 

If the copy quality is not acceptable, perform Manual Colour Balance adjustment:- 
 

 
 

 

 

 

This adjustment needs to be performed if:- 
 
a)  You are unable to get a satisfactory result from the automatic adjustment. 
b)  To suit individual customer needs. 

 
 

Enter Test Simulation 46-21, select  “A3” paper, and verify that all values are set to 
500.

 

(After completion of TC 46-24, this is done automatically). 

 
Press “EXECUTE”. 

 

A colour patch image will be printed. Examine the printout, and determine the 
following: 
 

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

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

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

density (left) to low density (right). 

4)  Each colour should be roughly equal in density. For example, Cyan should 

not be noticeably darker than Magenta, or vice- versa. 

 

Note: If the four colour “gamuts” are too intense between “G” and “A”, 
background may result.  A noticeable “drop-off” in intensity should occur near 
“G”. 

 
 

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