re: IE33, E cart, Diagnostic Code 503

one IE33 system  can not  power up  and  the diagnostic code is 503

I found the ErrorCode 503 stand for  scanhead select  issue

I got debug message from the consol to know that  relay  board can not finish initlize,

how can I position the  fault point for the next?

update?

IE33  Error message?

1?Failed to verify connector A relay status. Read 0x2, expected 0x3

2?Error switching scanhead connector relays

3?Relay Error - Failed to select connector

4?Failed to verify static pw relay status. Read 0x4, expected 0x5

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Test RF loopback test" target="AIM" executor="ACQ"  Result?FAIL

Scanhead Select Relay" target="AIM" executor="ACQ“    Result?FAIL