AR-C150 (serv.man42). Troubleshooting Copy Quality - Sharp Copying Equipment Technical Bulletin (repair manual). Page 12

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GMA050702 
Sharp Electronics (UK) Ltd., Technical Services Group
 
 
 
 
 
 
 
 
 
 
 
 
 
 
This is a very effective method of reducing background levels. 
 
Ensure Simulations 44-21 (Half Tone Adjustment) & 44-06 (Process Control) are 
performed following adjustment. 
 
Other: 
 
If excessive background is being experienced during duplex copying or printing, 
check and adjust the DV, MC and Transfer bias outputs as follows :- 
 
1. 
Verify that DV bias and MC grid voltages are adjusted to factory  
specification (refer to page 2 of this bulletin) 
2. 
Adjust the Transfer output voltage using Test Simulation 44-30 as 
follows:- 
 
    Transfer 
Voltage  (Simulation 44-30) 
 
DEFAULT VALUES 
DISPLAY 
BK C  M 
A: 
SPX 
178 164 123  123 
B: 
DPX 
178 164 123  123 
C: 
OHP 
204 209 167  182 
D: HEAVY PAPER 
204 
187 
138 
138 
 
 Change the duplex value (B: DPX) as shown below:- 
 
B: 
DPX 
204 187 138  138 
 
 
The fold will intersect row 
“G” on the 46-21 printout 
Adjust CMYK rows so that all 
four rows drop off evenly, 
usually between rows “G” 
and “F” 
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