Troubleshooting
TCIV TROUBLESHOOTING AND REPAIR
TCIV Find-It Fix-It
Summary: The following quick reference provides symptoms and procedures for troubleshooting them.
Just find your symptom and refer to the following procedure
your problem. These are
tried and true find-it and fix-it methods based on a detailed list provided by Art Bickle of
Central California Electronics, Fresno Cal. Thanks
from alI of us, Art!
Time Saving Hints and Suggestions
After making any program changes, use #71 to obtain the EEPROM checksum and record it.
Whenever a problem is reported, check this before doing any troubleshooting. If a user
program change has occurred, whether intentional
or
not, the checksum will change and may
point out the problem. This can save lots of time, and headaches.
Use the Statistics Locations for information on how the system is performing. Be sure to zero
out any statistics after servicing the system.
System Won’t Run / Locks Up
Isolate the MI0 and LLM-0 and try again (disconnect the flat cables
to any other LLMs and speaker control boards).
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
System Will
Step 1.
Note:
Step 2.
Step 3.
Check outlet voltage and TCIV MI0 vo12 Vdc and +5 Vdc. A short from +5 volts to
ground can be caused by a shorted over voltage protection diode (Dl) on the CPU. This
diode protects 5 volt components on the CPU from damage by 12 volts in case of failure in
the 5 volt regulator, or a short.
Determine if the computer will talk to the TCIV. Reset the TCIV with the computer serial port
connected to the CPU connector and the communications program operating. A proper reply
is T5. If any other reply or none, suspect the CPU.
If TCN talks to computer, verify all connectors to expansion boards are secure and in proper
polarity.
Ensure all boards are properly installed and that no connector contacts are bent back.
Ensure that Location Codes and architectural number programming is per your work sheet.
A severely misadjusted RP2 pot will cause the system to lock up. Perform the adjustment pro-
cedure as described in the manual.
Use #70 and verily the PROM version number and checksum are correct (refer to the latest
software revision sheet for proper values).
Not Program
Phone must have B:78 attributes on (7 for a display and 8 to allow programming).
Line 5 is best for a test phone because it is set-up as a display phone with each system reset.
Use #20 to clear display and insure display integrity.
Make sure the EEPROM jumper on the CPU is set to the ENable position.
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of 30 1989 Rauland-Borg Corporation (Orig. 10/88; Rev. l/89)
