Xerox DocuColor 2240, Service Manual

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09/03
2-62 DC 3535/2240/1632, WC M24
4-344, 4-345
Initial issue Status Indicator RAPs
4-344 IOT Micro Pitch
The micro pitch did not occur within the specified time.
Procedure
Switch the power off, then on. The problem continues.
Y N
Return to Service Call Procedures.
Replace the MCU PWB ( PL 13.1 ).
4-345 MCU/HVPS Communication
Communication error between MCU PWB and HVPS Control PWB
Procedure
There is +5 VDC from P/J574 -5 to P/J574 -4 on the HVPS Control PWB.
Y N
Disconnect P/J574 . There is +5 VDC from J574-5 to J574-4.
Y N
There is +5 VDC from
P/J406 -B5 on the MCU PWB to GND.
Y N
Replace the MCU PWB ( PL 13.1 ).
Go to Figure 1 . Check for open circuit or loose connections in the 5VDC supply wires
between P/J406 , pins B5 and B6; and P/J574 , pins 5 and 4.
Go to Figure 1 . Check the wire from J406-B5 to J574-5 for a short circuit to GND. If the
wire is OK, replace the HVPS Control PWB ( PL 9.1 ).
Switch off the power. Go to Figure 1 and check these wires for an open or short circuit to GND:
• HVPS Control PWB P/J574 -9 to MCU PWB P/J406 -B1.
• HVPS Control PWB P/J574 -8 to MCU PWB P/J406 -B2.
• HVPS Control PWB P/J574 -7 to MCU PWB P/J406 -B3
• HVPS Control PWB P/J574 -6 to MCU PWB P/J406 -B4.
If the problem continues, replace the MCU PWB ( PL 13.1 ). If this does not resolve the problem,
replace the HVPS Control PWB ( PL 9.1 ).
Figure 1 4-345 RAP Circuit Diagram