Xerox DocuColor 2240 Service Manual page 95

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).
Status Indicator RAPs
4-344, 4-345
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
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
Switch off the power. Go to Figure 1
• 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
replace the HVPS Control PWB (PL
Figure 1 4-345 RAP Circuit Diagram
09/03
2-62
(PL 13.1).
(PL 9.1).
and check these wires for an open or short circuit to GND:
(PL 13.1). If this does not resolve the problem,
9.1).
DC 3535/2240/1632, WC M24
Initial issue