Symptom: Pk-88 Does Not Respond Or Accept Commands - Advanced Electronic Applications PK-88 Operating Manual

PK-88 OPERATING MANUAL
6.4.3.

Symptom: PK-88 does not respond or accept commands

Type a command such as MYCALL or any other command. If the default settings are in ef-
fect, the PK-88 should echo typed characters back to the screen.
o Verify that U12 pin 21 shows a positive voltage level.
If the above tests are valid:
o Type any keys on the terminal and verify that data is present on U12 pin27 and U4
pin 11.
If data is not seen, the data is not reaching the PK-88 from the terminal.
o Verify J1, the cable, and U4 again.
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TROUBLESHOOTING
PK-88 - 148