1.4 Cautions on Using FIP
1) When troubleshooting according to the FIP, have on hand a normal MCU, LVPS, HVPS, FUSER
ASSY, BELT ASSY, etc., for possible fault isolation.
2) In the initial check according to the FIP, check only items which can be simply checked.
3) In the initial check according to the FIP, check the constitutive parts of the major check parts and
related parts, as well as major check parts.
4) When working with the printer, be sure to remove the power cord unless otherwise required.
Never touch live parts if not required, while the power cord is connected.
5) Connector condition is denoted as follows:
6) [P/J1-2PIN <=> P/J3-4PIN] in the FIP means measurement with the positive side of the measuring
instrument connected to [2PIN] of [P/J1] and the negative side to [4PIN] of [P/J3].
7) [P/J1<=> P/J2] in the FIP means measurement for all terminals corresponding between [P/J1] and
[P/J2] based on "Wiring Diagrams".
8) In [P/J1-2PIN <=> P/J3-4PIN] in the FIP where voltage is measured, [P/J3-4PIN] on the rear nega-
tive side is always at the AG (analog ground), SG (signal ground), or RTN (return).
Therefore, after checking of proper conductivity between AGs, SGs, or RTNs respectively, the rear
negative side can be connected to the PIN of AG, SG or RTN instead of [P/J3-4PIN].
However, care should be taken not to confuse [AG], [SG], and [RTN] because they are not on the
9) When measuring the voltage at small connectors, use the dedicated tool. Handle the tool with care
because its business end is pointed.
10) When measuring the voltage, set the BELT ASSY, toner cartridge and paper cassette, close the
COVERs and power ON unless otherwise required.
11) Numerical values in the FIP are only for guideline. Approximate values are acceptable.
12) In each step of the FIP, parts removal and other procedures implicitly required for the step are
13) In the FIP, "Replacement" means the replacement of the parts that are considered to be the cause
of the trouble. Replacement of those parts means the replacement of the assembly part (HIGH
ASSY) that contain them.
14) In the FIP, the paper cassette immediately below the printer main body is called "Tray 1", and the
cassette below it is called "Tray 2".
15) Some of the instructions in the FIP are branched off depending on the specifications. Follow the
16) For some optional components, you may have to refer to the manual of the relevant component for
troubleshooting. Have the relevant manual at hand as needed.
Connector (P/J12) is connected.
Plug side with the connector (P/J12) removed (except when attached directly to the
Jack side with the connector (P/J12) removed (except when attached directly to the
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Chapter 1 Troubleshooting