20
Section 4
Model 753A Gage Pressure Transmitter
Troubleshooting
Refer to
Table 4.3, page 20,
for troubleshooting information and
Section 5,
page 22,
for part location.
Table 4.3—Transmitter Troubleshooting
Problem
Possible
Source
Probable Cause
Corrective Action
No Output
Power
Source
Blown fuse, faulty
component
Replace fuse, repair
power supply
Transmission
Cable
Loose terminal connection
Tighten terminal
connection; locate
and replace broken
wire
Receiver
(or load)
Blown fuse, faulty component
Replace fuse; repair
or replace receiver
or load
Transmitter
Loose terminal, reversed power
connection, faulty component
Tighten terminal,
reverse power con-
nection, return to
factory for repair
Transmitter
"zeros" but
cannot get
full output
Power
Source
Low voltage
Repair power
source
Load
Resistance
Resistance too high
Replace load resis-
tance or repair as
required
Transmission
Cable
Resistance or length of cable in
excess of
specifications
Measure cable loop
resistance and bring
within specifications
Electronic
Module
Amplifier
Loss of gain
Return to factory for
repair
Out of
Calibration
Electronic
Component value shifted
Recalibrate or return
to factory for repair
Erratic or
Intermit-
tent
Operation
Terminal
Connections
Loose or dirty
Tighten and/or clean
as required
Electronic
Component
Defective component
Return to factory for
repair
Strain Gages Physical damage
Return to factory for
repair
Excess
Output (will
not "zero")
Transmitter
Defective component
Return to factory for
repair
