Adjust The Developing Bias Voltage; Adjust The Transfer Current, Voltage - Sharp MX-M550U Service Manual

1-B

Adjust the developing bias voltage

This adjustment is needed in the following situations:
* The high voltage power PWB (MC/DV/TC) has been replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
(Main charger grid voltage adjustment)
Item/operation mode
Copy Auto mode
Text mode
Text/photo mode
Photo mode
Printer All modes
FAX All modes
Cleaning mode
1) Remove the rear cover of the machine.
2) Apply a digital multi-meter to the connector CN2 pin (7) of the
high voltage PWB and the chassis GND.
CN2
3
3) Go through the modes specified in Simulation 8-1.
SIMULATION 8-1
DV BIAS SETTING. SELECT 1-7, AND PRESS START.
1.AUTO 495 2.CHARACTER
3.MIX 495 4.PHOTO
5.PRINTER 495 6.FAX
Press [START] key.
1-C

Adjust the transfer current, voltage

(Transfer voltage adjustment)
Item/
operation
mode
Front print 8-6 FRONT
Back print BACK
Transfer belt 8-17 SHV FRONT
(cleaning)
SHV BACK
THV-
Transfer 8-18 CRHV PLUS
roller
(cleaning)
Transfer CRHV MINUS
roller (print)
* MX-M700 only
8-1 AUTO
CHARACTER
MIX
PHOTO
PRINTER
FAX
PLUS
495
495
495 7.PLUS 150
Press [SYSTEM SETTINGS] key.
Simulation
Setting Default
range
0 – 800 350
400 *
0 – 800 350
400 *
0 – 600 450
0 – 600 450
0 – 75 10
0 – 250 200
0 – 250 200
MX-M700N ADJUSTMENTS 6 – 3
Simulation
Setting range
0 – 750
0 – 750
0 – 750
0 – 750
0 – 750
0 – 750
0 – 250
SIMULATION 8-1
DV BIAS SETTING. INPUT VALUE, AND PRESS START.
1:AUTO (0-750)
Press [START] key.
SIMULATION 8-1
DV BIAS SETTING. EXECUTING···.
1:AUTO
4) Select the number that corresponds to the adjustment item
using the numeric keypad.
5) Press the Start key.
6) Press the start key to have the voltage output for 30 seconds.
The operation can be stopped with the SYSTEM SETTINGS
key.
If the output voltage is not within the requirement, do the fol-
1
lowing steps.
7) Enter the adjustment value using the numeric keypad.
8) Press the Start key. (The adjustment value is put into memory,
and the corresponding voltage is output for 30 seconds.)
Repeat steps 7 to 8 until the output requirement is satisfied.
Adjustment
voltage Connector
(monitor voltage)
– –
– –
– –
– –
DC – 100 10v CN2
+2.0 10.1v –
–2.0 10.1v –
High voltage power PWB (MC/DV/TC)
Default Connector
495 CN2
495 CN2
495 CN2
495 CN2
495 CN2
495 CN2
150 CN2
Press [SYSTEM SETTINGS] key.
Or after 30sec output.
Actual voltage
Pin #
/actual current
– 35 1.0 A (1.0 – 1.5Kv)
40 1.0 A (2.0 – 2.5Kv) *
– 35 1.0 A (1.0 – 1.5Kv)
40 1.0 A (2.0 – 2.5Kv) *
– AC4.5Kv (p-p)
– AC4.5Kv (p-p)
1 DC –100 10v/AC4.5Kv (p-p)
Check +2000 100v
pin
Check –2000 100v
pin
Pin # Actual voltage
7 –500 5v
7 –500 5v
7 –500 5v
7 –500 5v
7 –500 5v
7 –500 5v
7 +500 5v
495
495
High voltage
power PWB
(MC/DV/TC)
High voltage
power PWB
(TC cleaning)