Oki B 6100, Technical Manual

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OKI B6100 Laser Printer - Base Engine Technical Manual 2-3
Version 1.0
Fault Isolation Procedures
General Notes on Using FIPs
1. FIPs assume there is no malfunction in printer controller. If you are unable to fix a problem using the
FIPS, we recommend that you replace the printer controller.
2. FIPs use new and "known good" components as troubleshooting tools. We recommend you carry a
spare CRU, PWBA HKB MCU, and PWB ESS.
3. Unless indicated otherwise, the instruction "switch ON main power" means for you to switch ON printer
power, and let the printer proceed through power-on diagnostics and warm-up until it is on-line and
ready to print.
4. Conventions used to represent connectors:
P/J XX means a Plug and its corresponding Jack, are connected.
PXX means a Plug is disconnected. (Unless this plug is soldered to a PWB).
JXX means a Jack is disconnected. (Unless this jack is soldered to a PWB).
5. When you are instructed to take a voltage reading between "P/J A–B and P/J X–Y", place the red
probe (+) of your meter on pin B of P/J A, and place the black probe (–) of your meter on pin Y of P/J X.
6. When you are instructed to take voltage readings between "P/J X and P/J Y" (without specified pin
numbers), check all voltage carrying pins. Refer to the Wiring/Connection Diagrams for signals and pin
numbers.
7. When you are instructed to take a voltage reading, the black probe (–) is generally connected to a pin
that is either RTN (Return) or SG (Signal Ground). You can substitute any RTN pin or test point in the
printer, and you can use FG (Frame Ground) in place of any SG pin or test point.
8. Unless a FIP instructs you otherwise; before measuring voltages make sure the printer is switched ON,
the CRU and Cassette Assy are installed, and the Cover Assy Front and Cover Assy Rear are closed
(Interlock Switch is actuated).
9. All voltage values given in the FIPs are approximate values. Actual measured voltages may vary
somewhat from the given values.
10. FIPs may instruct you to remove or replace a component. Refer to Section 10 Removal and Replace-
ment, for information on how to remove and reinstall a component.
11. When a FIP instructs you to replace a component, and that component is part of a larger assembly,
you should replace the entire assembly.