GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 3 Direction 18000
8-6-6
At this point, doing RAP’s in WTERM will also fail, and failure points are the same. Failure points are:
1) The 6809 processor on the IOC is “HUNG” in a byte count loop - To correct this error condition,
cycle AP power or run many RAP’s. This is rare but can occur if AP was shut down abnormally - one
example is a “CNTL A” during the UPAP serial transfer section. The 6809 communications processor
is still looking for more data on the serial link - it takes each RAP command and places it into public
memory as if it were a continuation of the previously aborted transfer. This will continue until the
internal byte counter is satisfied and the data transfer is complete. Newer deadstarts contain
breakout polling to automatically bring the AP out of this condition. This is especially important during
the UPAP process.
2) Check that the DGIO cable is properly installed at the AP backplane. (If installed incorrectly, it
can seriously damage the DGIOP). Correct this condition before installing new DGIOP.
3) Cable break or improper connection of RS-232 cable at AP Backplane B7P03.
4) Loss of + 12 volts at drivers in AP - IOC or DG - HIB
5) Loss of + 5v at AP
6) Wrong baud rate settings on IOC card (DIP switch)
7) Wrong baud rate setting or device select on HIB (DIP switches)
8) Bad RS232 driver / receiver IC’s on IOC or HIB
9) Failure of HIB or IOC
b) Error message seen from failure of secondary transfer:
*E* No Response from Deadstart *E*
*E* ’6809 COMMAND FAILED’, UNABLE TO ESTABLISH COMMUNICATION WITH AP
RS232 READ ERROR
RS232 WRITE ERROR
S2210210CB0008E223F9000200000002037823F9000200040002037C4...etc.
*E* Download Failed *E*
Messages of this type will only occur when the MASTER processor is involved in a transfer. The failure
points are:
1) MASTER card failure (Is the reset capacitor C94 in backwards? C94 is located between the IC’s at
F6 & F7. The + lead of the Capacitor should be toward the outer card edge, opposite the backplane).
2) PUBLIC memory failure
3) If the Public Memory Bus is “HUNG”, Deadstarts will also fail.
Remove the following boards (turn power off and pull each board out approx. 1 inch to
disconnect from backplane connector): DASIOP, DGIOP, BPC, BP1, & BP2. Deadstarts should now
pass except BPC, Backprojectors 0, 1, 2, 3, 4, 5 will fail; also no IOP’s will be found.
Assuming Deadstarts now pass as described, turn power off and plug one board in and repeat
Deadstarts. Repeat until the defective board is located.
4) RARE - Loss of clock to MASTER card from IOC (backpanel or IOC failure)
5) RARE - Hang of the public bus by another card - DASIOP, DGIOP,SLAVE,IOC,SMP, BACKPLANE
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