Troubleshooting
025-9567E 63
Fault Possible Cause
One row of keys cannot be
detected.
Driver Bd. circuit bad (U4, J4, J5, U9).
Switch Bd. circuit bad (RP1, PR2, U1, P1).
One column of keys cannot be
detected.
Driver Bd. circuit bad (U4, J4, J5, U9).
Switch Bd. circuit bad (P1, P2, RP2, U2, U4, RP4, R9, R11,
R67).
LEDs come on for no apparent
reason.
Instant Call key shorted or shorts intermittently.
Driver Bd. circuit bad (U4, J4, J5, U8).
Switch Bd. component bad.
Panel will not detect clear
mode or address jumpers, JP1
or JP3, correctly.
Power was not removed when jumpers where changed.
Driver Bd. circuit bad (JP1, JP3, RP1, CR1, CR4, CR3, U4).
Clear mode incorrect. Driver Bd. jumper JP3 in wrong position.
Panel sends key codes to
encoder with wrong panel
address.
Driver Bd. jumper JP1 in wrong position.
Lower left key will not cause
encoder to send.
Encoder is programmed with the wrong Send-before-review
mode.
Pressing a key causes its LED
to come on momentarily, the
encoder to beep, and the LED
to go off.
Instant Call stack for that key has not been programmed into
encoder.
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