mensor PCS 400 - Page 64

Table 5.1 continued...
Symptoms and Clues Possible Cause Try This
7 SYSTEM UNABLE TO COMMUN-
ICATE OVER THE GPIB
CLUE: Signals are not being
transferred from the GPIB board to
the rear panel of the PCS 400.
The GPIB address or
termination character is set
incorrectly.
----------------------
GPIB cable is disconnected at
the front of the electrical
module
Æ.
----------------------
The GPIB card is not properly
seated in the electrical
module.
Check and reset the GPIB
parameters from the front panel
keys.
-------------------------
Re-connect the cable.
--------------------------
Re-seat the GPIB card into its
mating connector.
8
SYSTEM UNABLE TO COMMUN-
ICATE OVER THE RS-232 PORT
CLUE: Signals are not being
transferred from the CPU board in
the electrical module to the rear
panel.
The RS-232 parameters are
not set up properly
----------------------
TheRS-232cableis
disconnected from the CPU
board
Ç .
----------------------
CPU board not seated.
Check and reset serial parameters
from the front panel keys.
-------------------------
Re-connect the cable. The red
conductor connects to pin 1, COM1.
--------------------------
Re-seat CPU board into its
connector.
9
INACCURATE OR NO RE-
SPONSE TO THE SOURCE
PRESSURE TEST
CLUE: The auxiliary transducer on
the pneumatics module measures
the source pressure by opening
only the coarse supply solenoid. Its
calibrated analog output is read by
the electrical module and converted
to pressure.
Transducer cable is discon-
nected on the auxiliary
transducer board
 or at the
50 pin connector
Ä on the
electrical module.
---------------------
The coarse supply solenoid
À is not connected or not
opening.
Re-connect the cable.
--------------------------
Run the solenoid test to determine
if the coarse supply solenoid valve
is operating.
10
TOP LINE OF DISPLAY SHOWS
ZEROS DURING BAROMETRIC
REFERENCE CALIBRATION,
BUT SHOWS BAROMETRIC
PRESSURE WHEN THE BARO-
METRIC SENSOR IS MADE
ACTIVE.
CLUE: The PCS 400 looks for a
specific transducer address during
barometric calibration.
Either the address on the Bar-
ometric Reference Sensor, or
the interrupt is improperly set.
Check that the address of the
Barometric Reference Sensor is set
to address 2 (W2) with no interrupt
(no jumper) on W8 or W9.
PCS 400 MAINTENANCE
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