Xerox M20 - WorkCentre B/W Laser, Service Manual

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December 2006
6-5 WorkCentre M20, 4118, FaxCentre 2218 Family
GP 1
General Procedures and Information
DEV SUPPLY 450V (Not to be used dur-
ing service, manufacturing use only) ON Switches on -450V to the DEV OFF Switches off the voltage to the DEV
THV SUPPLY NEG VOLT(Not to be used
during service, manufacturing use only) ON Switches on negative voltage to the THV OFF Switches off the negative voltage to the THV
THV SUPPLY 1301V (Not to be used dur-
ing service, manufacturing use only) ON Switches on 1301V to the THV OFF Switches off the voltage to the THV
THV ADC READ CHECK Reads and displays the THV ADC value. If the ADC
value is between 1 and 254 inclusive, this indicates
that the THV value is good. If the value is 0 or 255 the
display will read “Over The Range”. This indicates
problems with the toner cartridge or drum cartridge or
their respective contacts NEXT Go to the next test (MHV SUPPLY 1350V)
6 START TEST NEXT RIGHT KEY. Automatically starts test sequence at 2
second intervals. For actual components tested refer to
the following items. EXIT STOP KEY. Returns to the top level of Engine Test
Mode.
ALL MOTOR CONTROL
FUSER MOTOR CONTROL
DUPLEX CONTROL
FCF PICKUP CONTROL
M P PICKUP CONTROL
PTL CONTROL
FAN CONTROL
FUSER CONTROL
LSU MOTOR CONTROL
LASER DIODE CONTROL
LSU FAN CONTROL
SENSOR DETECT CV / FD / EX / OB / FE / ME
MHV CONTROL
DEV CONTROL
THV NEG CONTROL
THV CONTROL
MHV ADC READ
THV ADC READ
TEST END
Table 1 Test Map
Test No. Test Items (Description) Setting Description Setting Description
Table 2 Sensor Description
Displayed name. Sensor name Parts list
CV CBF - harness; switch - micro
(Right hand cover interlock) PL 4.17 Item 2
FD PBA sub - feed and P.EMP sensor
(Feed sensor) PL 8.25 Item 12
(Actuator - PL 8.25 Item 25)
Table 2 Sensor Description
Displayed name. Sensor name Parts list