AL-840 (serv.man6). AL800 840 Service Manual-Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 19

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*
Job content
1) Put an oscilloscope between the check point JP3 (VIN) on the
MCU (PCU) PWB and GND.
At that time, trigger with the SH (JP4) signal to see the waveform
correctly.
2) Execute simulation 63-1. (The copy lamp lights up in the scanner
unit home position.)
3) Turn and adjust the volume on the copy lamp drive PWB so that
the CCD output waveform max. value is 4.0 
±
 0.1 V.
*
Trouble caused y improper operation
1) E7 (05) trouble
2) E7 (04) trouble
3) E7 (12) trouble
4) E7 (15) trouble
5) Copy exposure cannot be adjusted.
6) Copy exposure abnormality
*
Preliminary work
JOB No
Content
S  004
Scanner (reading) section cleaning
*
After-work
JOB No
Content
ADJ M1
Copy exposure adjustment
*
Necessary tools
Name
Oscilloscope
Parts code/Price rank
—
Adjustment VR
4.0±0.1V
7 – 19
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AL-840 (serv.man18) Section 10- Carriage 2 unit Parts Guide 2 75.01 KB
AL-840 (serv.man19) Section 9- Carriage 1 unit Parts Guide 2 80.29 KB
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AL-840 (serv.man21) Section 7- Fusing Unit Parts Guide 2 142.13 KB
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AL-840 (serv.man23) Section 5-Lower Frame Section No 1 Parts Guide 2 199.12 KB
AL-840 (serv.man24) Section 4-Upper Frame Section Parts Guide 2 165.51 KB
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AL-840 (serv.man45) Addition And Change Of Parts. (WHITE) Technical Bulletin 2 48.34 KB
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AL-840 (serv.man39) 1.Change Of Fusing Spring R. 2.Change Of Operation Manual. (WHITE) Technical Bulletin 2 81.58 KB
AL-840 (serv.man38) 1.Parts Change For Better Productivity. 2.Addition Of Switch Sheet. 3.Addition Or Disuse Of The Parts For Satisfying EMI. 4.Improvement Of The Fax PWB. (WHITE) Technical Bulletin 3 174.08 KB
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