Specifications

Chapter 6: FRU Replacement and Fault Isolation Procedures

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6.3.13 Paper Size Switch failure continued

PAPER SIZE SWITCH SIGNAL ANALYSIS

Insert the paper trays into the printer.

Disconnect P/J 111 from the HVPS.

Refer to the Component Connection/Wiring Diagram MCU PWB, Feeder PWB, Feeder PWB

AUX, Feed Solenoid, and the Turn Solenoid signal voltage table in the General Procedures and

Information section of this manual.

Measure the voltage between P/J 13-5 and P/J 13-4 on the MCU PWB (Tray 1).

Measure the voltage between P/J 13-6 and P/J 13-4 on the MCU PWB (Tray 2).

Are the voltages measured the same as those shown in the MCU PWB, Feeder PWB,

Feeder PWB AUX, Feed Solenoid, and the Turn Solenoid signal voltage table?

Yes No

Replace the MCU PWB. Go to Step 5.

5. TRAY 1 HARNESS ASSEMBLY ANALYSIS

Disconnect P/J13 on the MCU and P/J115 on the Paper Feeder PWB.

Is there continuity (0

Ω) Ω)

between all wires on J13 and J115?

Yes No

Replace the Feeder PWB. Replace the Tray 1 Harness Assembly.

6. FEEDER PWB ANALYSIS

Disconnect P/J 116 on the Paper Feeder PWB.

Is there continuity (0

Ω) Ω)

between all pins on J115 and J116 on the Feeder PWB?

Yes No

Go to step 7 Replace the Feeder PWB.

7. HARNESS ASSEMBLY ANALYSIS OUT (Tray 2)

Disconnect P/J 115 and P/J 116 on the Tray 2 Paper Feeder PWB.

Is there continuity (0

Ω)Ω)

between all wires on J115 and J116 on the Tray 2 Harness

Assembly?

Yes No

Replace the Feeder PWB AUX. Replace the Harness Assembly OUT.