| Error Messages During
Electronics Power On
Diagnostics
1.) Verify A/D Board
"4.7V Zener failure s/b
3008-4512, Reading = "
"+5V failure s/b 1880-2120,
Reading = "
"+15V failure s/b
2820-3180, Reading = "
"-15V failure s/b
2820-3180, Reading = "
"Sink +5V failure s/b
1800-2200, Reading = "
"Vth DAC/ADC failure s/b
< 751, Reading = 00001, Step = 0001"
"Vsr DAC & Hi-V Power
Supply failure s/b < 193, Reading = "
Vsr Comparator failure - Hi
level
Vsr Comparator failure - Lo
level
"Isr failure, Level OH - (
)"
"Ith Comparator failure -
Lo limit"
"Ith Comparator failure -
Hi limit"
"VON Comparator
failure"
Cause: Incorrect A/D board readings
during diagnostics.
Correction:
1.) Replace A/D board.
2.) Examine Data Ribbon Cable
from computer.
3.) Defective "Interface
board" if more than one error conditions.
2.) Backplane select
logic
"Select logic failed in BP
0 - ( 0)"
Cause: Invalid backplane select.
Correction:
1.) Replace "Distribution
Board."
2.) Replace "Power
Supply" board if error occurs not in BP 0.
3.) Replace A/D board if
error occurs in BP 0.
4.) Examine data ribbon
cable.
5.) Defective Point Select
Board in Backplane.
6.) Software is not
compatible with hardware.
3.) Source node
selection logic
"Source select failed in BP
0 - B0, 000"
Cause: Invalid source node selection data
pattern.
Correction:
1.) Replace "Distribution
Board."
2.) Examine Data Ribbon Cable.
4.) Sink node selection
logic
"Sink select failed in BP 0
- B0, 000"
5.) Check for resistance
/ leakage on sinks
"SHORTED sink at node 0,
board 0"
"OPEN transistor at node 0,
board 0"
6.) Check for resistance
/ leakage on sources
"SHORTED sink at node 0,
board 0"
"OPEN transistor at node 0,
board 0"
7.) Check for select /
shorted board failures
"Select failure at node 0,
board 0 A"
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