1 - 4Chapter 1 Troubleshooting1.4 Cautions for FIP Use1) It is assumed in the FIP that the printer controller (PWBA ESS) is normally functioning. If anytrouble cannot be corrected by troubleshooting, replace the printer controller with a normal one andcheck for proper operation again.If the trouble is not still corrected, replace the major parts and then related parts in succession andconfirm according to the procedure of the “Check”.2) When troubleshooting according to the FIP, normal HVPS/MCU, LVPS, FUSER ASSY, BTR ASSYand so no may be necessary for isolation of failed parts. Prepare them in advance.3) In the initial check according to the FIP, check only items which can be simply checked.4) In the initial check according to the FIP, check the constitutive parts of the major check parts andrelated parts, as well as major check parts.5) When working with the printer, be sure to remove the power cord except when requiredspecifically. Never touch live parts if not required, while the power cord is connected.6) Connector condition is denoted as follows:[P/J12] → Connector (P/J12) is connected.[P12] → Plug side with the connector (P/J12) removed (except when attached directly to theboard).[J12] → Jack side with the connector (P/J12) removed (except when attached directly to theboard).7) [P/J1-2PIN <=> P/J3-4PIN] in the FIP means measurement with the plus side of the measuringinstrument connected to [2PIN] of [P/J1] and the minus side to [4PIN] of [P/J3].8) [P/J1<=> P/J2] in the FIP means measurement for all terminals corresponding between [P/J1] and[P/J2] referring to “Wiring Diagrams”.9) In [P/J1-2PIN <=> P/J3-4PIN] in the FIP where voltage is measured, [P/J3-4PIN] on the rear minusside is always at the AG (analog ground), SG (signal ground), or RTN (return).Therefore, after checking of proper continuty between AGs, SGs, or RTNs respectively, the rearminus side can be connected to the PIN of AG, SG or RTN instead of [P/J3-4PIN].However, care should be taken not to mistake since [AG], [SG], and [RTN] are not on the samelevel.10) Measure the voltage of small connectors with the special tool. Handle the tool with care, as theleading edge of the tool is pointed.11) When measuring the voltage, set the EP CARTRIDGE, BRT ASSY and paper tray, close theCOVER TOP ASSY, FUSER ASSY, and COVER REAR and power ON if not required specifically.12) Numerical values in the FIP are only for standard. If numerical values are approximate, they shouldbe considered permissible.
