Keypad Troubleshooting Flow Chart - Thermo Scientific PARTISOL 2000 Service Manual

KEYPAD TROUBLESHOOTING FLOW CHART

No response
from keypad
Perform system
reset.
If only one key is bad,
keypad is probably
defective.
Response
from keys on
keypad?
No response
Only one or
several keys bad
Check continuity of
Replace keypad with
cable between P15
known good one
(interface board) and
R&P P/N 55-002345
P70 (keypad).
No
New keypad
fix problem?
Yes
Return defective keypad
for replacement.
AMBIENT PRESSURE TROUBLESHOOTING FLOW CHART
This error code occurs if
the ambient pressure is
The pressure must be
greater than 0.4 atm to
Go to the statistics screen
and observe the ambient
pressure reading.
Replace cable
R&P P/N 51-002376
No
Place multimeter across test
points AMBPRESS (blue) and
AGND (black) on interface
Continuity OK?
board (see note 1).
Yes
Replace interface/CPU
board assembly
R&P P/N 50-005496
& 10-002407
Replace interface/CPU
R&P P/N 50-005496
Note:
Error code
1. The voltage at this test point is related to the
"P"
pressure according to the following
equation:
V * 0.2194 + 0.104215 = P (atm)
out of range.
be valid.
Voltage Perform system
Yes
nominal? reset.
No
board assembly
No
& 10-002407
Resume normal
operation.
Yes
Problem
corrected?