ZETRON Model 25 - Page 64

Troubleshooting
56 025-9567E
Table 16. Error Codes for Power-on Self-test
Encoder Error Code Probable Failure Cause
Err0
Instant Call Panel(s) or Loop connection(s)
Encoder Bd: U30, U21, U26-U29, J4,
Driver Bd: U8, U1-U4, U9, J3, J1
Err1
Wrong microprocessor mode
Encoder Bd:, U19, U21,U29
Err2
Microprocessor software memory (EPROM) bad
Encoder Bd: U5-U7, U1-U4, U18,
Err3
Microprocessor temporary memory (RAM) bad
Encoder Bd: U19
Err4
Time clock board bad
Time clock Bd components
Err5
Microprocessor/Peripheral interrupts bad
Encoder Bd: U19, U8, U1, U2, P5
Err6
Digital operational memory bad
Encoder Bd: U4, U1-U3, U18, U28,
Err7
Front Panel / Relay driver I/O bad
Front Panel Bd. components / cable
Encoder Bd: U8, J2, U16-U120
Err8
Tone control I/O bad
Encoder Bd: U17, U18, J2, U1, J2, U3-U6
Err9
EEPROM parameter storage memory bad
Encoder Bd: U3, U1-U2, U4, U18, U28, or program
Enable/Disable switch, JP3, is in the wrong position
If the encoder displayed the loop error code, “Err0”, then one or more Instant Call panels
may have faults. If an instant call panel detects a fault within its own circuitry, it will
illuminate one or more LEDs in the right-hand key column. Table 17 describes the error
indication and the probable cause.