Read Sharp AL-1555 (serv.man11) Service Manual online
AL-1555 ADJUSTMENTS 9 - 5
(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.)
mode.)
3) Make a copy.
Check the adjustment level (shown in the above table) of the
exposure test chart (Sharp Gray Scale).
exposure test chart (Sharp Gray Scale).
(When too bright): Decrease the value displayed on the copy quantity
display.
(When too dark):
Increase the value displayed on the copy quantity
display.
display.
* The value can be set in the range of 1 - 99.
3. High voltage adjustment
A. Main charger (Grid bias)
Note:
• Use a digital multi meter with internal resistance of 10M
Ω
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).
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.
B. DV bias check
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).
frame).
3) Execute SIM 25-1 to output the developing bias for 30sec, and
check that the output is – 400 ±8V.
Adjustment mode
Exposure mode
display lamp
Sharp gray chart
adjustment level
Auto mode
Auto lamp ON
"3" is slightly copied.
Manual mode
Manual lamp ON
"3" is slightly copied.
Photo mode
Photo lamp ON
"3" is slightly copied.
Manual T/S mode Manual lamp/Photo lamp
ON
"3" is slightly copied.
Auto T/S mode
Auto lamp/Photo lamp ON "3" is slightly copied.
Sharp Gray Scale adjustment level
Non toner
save mode
save mode
Toner save
mode
mode
(1) Mode select key/display
lamp
(2) Exposure level select
key/display lamp
(1)
(2)
1
10
W
2
3
4
5
6
7
8
9
Slightly copied.
Not copied.
1
10
W
2
3
4
5
6
7
8
9
Slightly copied.
Not copied.
Note: • A digital multi meter with internal resistance of 1G
Ω
must be
use for correct check.
• The adjustment volume is locked, and no adjustment can be
made.
VRG1
VRG2
VRDV
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