Faulty Ld Switch - Star Micronics LS-5 SERIES Technical Manual

3-11. Faulty LD Switch

Step
1 Check parts with different specifications for problems with
usage, defective installation, breakage, deformation, and adhe-
sion of grime or foreign matter.
• Main parts to be checked:
(1) CRU sensor PCB, (2) MCU PCB, (3) CRU sensor assy
(4) EPX toner cartridge, (5) Harness assy HVPS
2 (Check operation of CRU actuator assy)
In the CRU actuator assy, does the LD switch (S101) of the
CRU sensor PCB go on when the EPX toner cartridge is
installed, and off when there is no EPX toner cartridge?
• Remove the CRU sensor cover and try installing and remov-
ing the EPX toner cartridge to check the CRU actuator assy
visually.
3 (Check EPX toner cartridge)
Check to see if the protruding section of the EPX toner
cartridge is positioned properly to move the CRU actuator assy.
4 (Check CRU sensor PCB)
Is there conductivity between P118-3PIN
the LD switch (S101) of the CRU sensor PCB is on, and no
conductivity when the switch is off?
5 (Check harness assy HVPS)
Is there conductivity between J15
Check
↔
P118-4PIN when
↔
J118?
– 105 –
TROUBLESHOOTING
Measure
YES
To step 2 Replace or
reinstall.
To step 4 To step 3
Replace EPX
Replace CRU
toner cartridge.
actuator assy.
To step 5 Replace CRU
sensor PCB.
Replace harness
Replace MCU
assy HVPS.
PCB.
NO