PK-232 TECHNICAL MANUAL
CHAPTER 7 – TROUBLESHOOTING
PK232TM Rev. A 5/87
7-2
Page 41
7.2.2.
Obvious Problems
Look for any unusual physical symtoms.
o
Are any components discolored?
o
Does something smell burned?
o
Do any of the parts seems excessively warm?
7.2.3.
Assembly Problems
Carefully inspect the PC board and component installation.
o
Are all integrated circuits firmly seated in their sockets?
o
Are any integrated circuits leads tucked under the chip or bent so that they aren't
making proper contact with the integrated circuit socket?
7.2.4.
Cabling Problems
Inspect the interconnection cabling.
o
Do the cables perform correctly with another controller?
o
Has the radio and/or terminal been successfully used with this or another controller?
o
Are all connections tight?
o
Does the cable appear frayed or broken?
7.3.
Specific Symptoms
Although the above steps may seem obvious, careful visual inspection often points to a
problem or provides significant indications as to the controller's most suspect area.
Proceed to more specific analysis after completing the physical inspection and delaing with
the apparent problem.
7.3.1.
Symptom: Controller appears dead
If the controller responds to initial power application with the
MULT
,
STA
,
SEND
and
CON
LED
s lit but fails to respond to any commands:
o
Verify that the integrated circuits at locations U2 and U3 are correctly installed with
the indicator notch position matching the marking on the printed-circuit board mark-
ing.
o
Verify that the controller's power source can provide at least 700 milliamperes con-
tinuos current at 13 volts.
If the controller responds to initial power application with only the
BAUDOT LED
lit but
fails to respond to any commands:
o
Suspect the terminal port at this point. The processor and the software in EPROM
are probably operating correctly.
o
Verify all cables and connections between the controller and the terminal.
o
Verify logic levels according to the terminal interface troubleshooting section in this
chapter.
Summary of Contents for PAKRATT PK-232
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