Filtec FT-70c, Service And Technical Reference Manual

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Chapter 8: Diagnostic and Repair Procedures
8-27
Replacing the Software PROMs.
The software PROMs must be replaced as a set. Each PROM is
labelled as either U25 or U26.
1. Locate PROMs U25 and U26. These are the PROMs that
contain the machine software.
2. Carefully remove each PROM with a PROM puller.
3. Carefully align and then insert PROM U25 into socket U25. Do
not force the PROM. If you break the pins you must reorder the
PROM.
4. Carefully align and then insert PROM U26 into socket U26. If
PROM U26 is shorter than the PROM socket, align the left side
of the PROM and socket so that the excess socket length is on
the right. Do not force the PROM. If you break the pins you
must reorder the PROM.
If LED 12 indicates CPU has locked up.
If LED 12 (also called the “Watchdog LED”) on the Processor Card
is on, this indicates the CPU has locked-up. This could indicate a
software failure or processing error. Reboot the machine and begin
operations.
Serial Communications Card Troubleshooting
If serial communications cease, check to be certain the Serial
Communications Status has not been deactivated. If not, the
terminal board is malfunctioning and must be replaced.
Control Panel Troubleshooting
The display does respond when keys are pressed
1. Turn the FT-70’s power off and press the reset button and turn
on the power to the machine. Wait for the three beeps before
releasing the Reset Button.
2. Remove the FT-70’s cover and verify the ribbon cable from the
touchpad is undamaged and properly connected to the
terminal board.
3. Inspect the control panel display touchpad for water damage.
If moisture is present, replace the control panel.
Industrial Dynamics Company, Ltd. © Form
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