Troubleshooting
025-9567E 57
Table 17. Error Codes for Instant Call Panel Faults
Instant Call Error Code
(Right column LEDs)
Probable Failure Cause
● (on)
● (on)
● (on)
● (on)
● (on)
● (CLEAR key on)
Microprocessor temporary memory (RAM) bad
Driver Bd: U4
○ (off)
● (on)
● (on)
● (on)
● (on)
● (CLEAR key on)
Microprocessor software memory (EPROM) bad
Driver Bd: U7, U6, U10, U9
○ (off)
○ (off)
● (on)
● (on)
● (on)
● (CLEAR key on)
Microprocessor timer bad
Driver Bd: U4
○ (off)
○ (off)
○ (off)
● (on)
● (on)
● (CLEAR key on)
Panel driving I/O bad
Driver Bd: U4, U9, U3, RP1, CR3, CR4, J4, J5, U8
Switch Bd. component(s) bad
○ (off)
○ (off)
○ (off)
○ (off)
○ (off)
● (CLEAR key on)
Microprocessor mode wrong
Driver Bd: CR3, CR4, U4, RP1
CONTINUOUS SELF-TEST
After the self-test has completed at power-on, the encoder will enter the idle state, in which a
limited self-test is continually being executed. Faults found in the idle state test are indicated
in the same way as the power-on self-test. A more complete, continuous self-test, like that of
the power-on test, may be initiated from the keypad at any time. The continuous self-test is
started by holding down the RESET key then the “#” key. The RESET key is then released
while the “#” key is down and when the display changes to “PrOG”, the “#” key may be
released. The continuous self-test will then begin. The continuous self-test will execute until
a fault is found or until the RESET key is pressed.
The continuous self-test will enter a different mode if a keyboard key, other than
RESET, is
held down for one complete encoder test cycle. This mode tests the keyboard keys, tone
output, and eight control relays. After the new mode has been invoked, a press of any
keyboard key should cause its character to be displayed while it is held down. The 16 keys of
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