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.
YN
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.
YN
Disconnect P/J574. There is +5 VDC from J574-5 to J574-4.
YN
There is +5 VDC from P/J406-B5 on the MCU PWB to GND.
YN
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
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