High Voltage Adjustment - Sharp AL-1215 Service Manual

(2) Perform the adjustment in each mode.
1) Execute SIM 46-1.
2) Select the mode to be adjusted with the exposure mode select key.
Set the exposure level to 3 for all adjustment. (Except for the auto
mode.)
(1)
(2)
(1) Mode select key/display
(2) Exposure level select
Exposure mode
Adjustment mode
display lamp
Auto mode Auto lamp ON
Manual mode Manual lamp ON
Photo mode Photo lamp ON
Manual T/S mode Manual lamp/Photo lamp
ON
Auto T/S mode Auto lamp/Photo lamp ON "3" is slightly copied.
3) Make a copy.
Check the adjustment level (shown in the above table) of the
exposure test chart (Sharp Gray Scale).
Sharp Gray Scale adjustment level
Non toner
1 2 3 4
save mode
Slightly copied.
Not copied.
Toner save
mode 1 2 3 4
Slightly copied.
Not copied.
(When too bright): Decrease the value displayed on the copy quantity
display.
(When too dark): Increase the value displayed on the copy quantity
display.
* The value can be set in the range of 1 - 99.
lamp
key/display lamp
Sharp gray chart
adjustment level
"3" is slightly copied.
"3" is slightly copied.
"3" is slightly copied.
"3" is slightly copied.
5 6 7 8 9 10
5 6 7 8 9 10
AL-1551CS ADJUSTMENTS 9 - 5

3. High voltage adjustment

A. Main charger (Grid bias)
Note:
• Use a digital multi meter with internal resistance of 10MΩ or more
measurement.
• After adjusting the grid LOW output, adjust the HIGH output. Do not
reverse the sequence.
Procedures
1) Set the digital multi meter range to DC700V.
2) Set the positive side of the test rod to the connector CN11-3
(GRID) of high voltage section of the power PWB and set the
negative side to the frame ground (power frame).
3) Execute SIM 8-3. (The main charger output is supplied for 30 sec
in the grid voltage LOW output mode.)
4) Adjust the control volume (VRG2) so that the output voltage is
– 390 ±20V.
5) Execute SIM 8-2. (The main charger output is supplied for 30 sec
in the grid voltage HIGH output mode.)
6) Adjust the control volume (VRG1) so that the output voltage is 580
±12V.
W
B. DV bias check
W
Note: • A digital multi meter with internal resistance of 1GΩ must be
use for correct check.
• The adjustment volume is locked, and no adjustment can be
made.
Procedures
1) Set the digital multi meter range to DC500V.
2) Set the positive side of the test rod to the connector CN-10-1 (DV
BIAS) and set the negative side to the frame ground (power
frame).
3) Execute SIM 8-1 to output the developing bias for 30sec, and
check that the output is – 400±8V.
VRG1
VRG2
VRDV