Level 1 Fip (Fault Isolation Procedure); Precautions When Using Fip (Fault Isolation Procedure) - Epson AcuLaser C8500 Service Manual

EPSON AcuLaser C8500

5.2 Level 1 FIP (Fault Isolation Procedure)

5.2.1 Precautions When Using FIP (Fault Isolation
Procedure)
1. FIP assumes that the printer controller (CONTROLLER PWB) is functioning
properly. If you are troubleshooting and cannot repair a problem, replace
the printer controller with one that is functioning properly and see if that
helps. If the problem still cannot be fixed, check "Main Check Parts" of
"Initial Check" and replace related parts in the sequence given.
2. Troubleshooting by FIP requires consumable parts, such as MCU PWB,
DRUM CARTRIDGE, and Y/M/C/K ET cartridges. Make sure those parts are
functioning properly before troubleshooting.
3. At the "Initial Check" of FIP, check that it can be done at a simple level.
4. In addition to "Main Check Parts" of "Initial Check," check configuration
parts of main check parts and other related parts.
5. Be sure to unplug the POWER CORD except when necessary when
performing work. Never touch conducting parts except when necessary if
the POWER CORD is plugged in.
6. The following is indicated for connectors:
Indicates connector (P/J12) is connected.
Indicates "plug" side with connector (P/J12) disconnected (doesn't
include when directly mounted on board).
Indicates "jack" side with connector (P/J12) disconnected (doesn't
include when directly mounted on board).
7. "P/J1-2PIN <=> P/J3-4PIN" in FIP means to measure "2PIN" of "P/J1" by
connecting to positive side of meter, and "4PIN" of "P/J3" by connecting
to negative side.
8. "P/J1 <=> P/J2" means to measure all pins between "P/J1" and "P/J2"
while referring to "Chapter 9: Wiring Connection Diagram."
9. With "P/J1-2PIN <=> P/J3-4PIN" when measuring voltage in FIP, the
negative side "P/J3 - 4PIN" is always AG (analog ground), SG (signal
ground), or RTN (return). After making sure there is conductivity between
AG's, SG's and RTN's respectively, you can connect the negative side to a
Troubleshooting
PIN of another AG, SG or RTN instead of "P/J3 - 4PIN." AG's, SG's and
RTN's are however not all of the same level, so you must be careful not to
confuse them.
10. The terminal surface (every other one toward yourself / away from
yourself) the side of the connector must be used when measuring voltage
of P/J16, P/J17, P/J19 and P/J20B. The terminal surface is small, so using
a tester with slender probes, you must make reliable contact with the
inside terminal surface in particular.
11. To measure voltage, particularly when unnecessary, mount the DRUM
CARTRIDGE and paper tray, and measure with the FRONT COVER ASSY,
TOP COVER ASSY, MAIN P/H ASSY, FUSER ASSY and EXIT UPPER ASSY
closed and the power ON.
12. Numerical values in FIP are target values; approximate values are judged
as being the same.
13. There are no specific instructions for parts to be removed and their
removal in order to perform checks indicated in FIP. Be careful when
performing such work.
14. "Replacement" in FIP indicates parts which are possible sources of
trouble. "Replacement" also indicates parts or assembly parts containing
such parts (HIGH ASSY) to be replaces and checked.
15. In FIP, the paper tray feed at the bottom of the printer is called "Cassette
1," the first level of the optional FEEDER UNIT is called "Cassette 2, the
second level is called "Cassette 3".
16. FIP contains a section that distinguished between whether a DIAG toll
(maintenance tool) is used or not, and the problem is repaired according
to the applicable instructions.
17. FIP contains a section that distinguishes between certain specifications,
and the problem is repaired according to the applicable instructions.
18. Troubleshooting for options proceeds according to the respective
manuals for options. Keep the required option manual on hand and refer
to when needed.
Level 1 FIP (Fault Isolation Procedure)
Revision C
5-21