Sharp MX-M550U

MX-M700N ADJUSTMENTS 6 – 3
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)
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.
3) Go through the modes specified in Simulation 8-1.
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-
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.
1-C Adjust the transfer current, voltage
(Transfer voltage adjustment)
* MX-M700 only
Item/operation mode
Simulation High voltage power PWB (MC/DV/TC)
Setting range Default Connector Pin # Actual voltage
Copy Auto mode 8-1 AUTO 0 – 750 495 CN2 7 –500r5v
Text mode CHARACTER 0 – 750 495 CN2 7 –500r5v
Text/photo mode MIX 0 – 750 495 CN2 7 –500r5v
Photo mode PHOTO 0 – 750 495 CN2 7 –500r5v
Printer All modes PRINTER 0 – 750 495 CN2 7 –500r5v
FAX All modes FAX 0 – 750 495 CN2 7 –500r5v
Cleaning mode PLUS 0 – 250 150 CN2 7 +500r5v
Press [START] key. Press [SYSTEM SETTINGS] key.
CN2
3
SIMULATION 8-1
1
DV BIAS SETTING. SELECT 1-7, AND PRESS START.
1.AUTO 495 2.CHARACTER 495
3.MIX 495 4.PHOTO 495
5.PRINTER 495 6.FAX 495 7.PLUS 150
Press [START] key. Press [SYSTEM SETTINGS] key.
Or after 30sec output.
SIMULATION 8-1
DV BIAS SETTING. INPUT VALUE, AND PRESS START.
1:AUTO (0-750)
495
SIMULATION 8-1
DV BIAS SETTING. EXECUTING···.
1:AUTO
495
Item/
operation
mode
Simulation
Adjustment
voltage
(monitor voltage)
Connector Pin #
Actual voltage
/actual current
Setting
range
Default
Front print 8-6 FRONT 0 – 800 350 – – – 35r1.0PA (1.0 – 1.5Kv) High voltage
power PWB
(MC/DV/TC)
400 * 40r1.0PA (2.0 – 2.5Kv) *
Back print BACK 0 – 800 350 – – – 35r1.0PA (1.0 – 1.5Kv)
400 * 40r1.0PA (2.0 – 2.5Kv) *
Transfer belt
(cleaning)
8-17 SHV FRONT 0 – 600 450 – – – AC4.5Kv (p-p)
SHV BACK 0 – 600 450 – – – AC4.5Kv (p-p)
THV- 0 – 75 10 DC – 100r10v CN2 1 DC –100r10v/AC4.5Kv (p-p)
Transfer
roller
(cleaning)
8-18 CRHV PLUS 0 – 250 200 +2.0r10.1v – Check
pin
+2000r100v High voltage
power PWB
(TC cleaning)
Transfer
roller (print)
CRHV MINUS 0 – 250 200 –2.0r10.1v – Check
pin
–2000r100v