10
S e c t i o n 4
Diagnostics
4.1 Hardware Reset
On occasion, it may be necessary to perform a reset of the
PC4820 to factory default programming. To perform a
hardware reset of the PC4820, the following steps must
be performed:
1. Power down the PC4010/4020 by removing both AC
and battery power from the control panel.
2. Power down the PC4820 modules by removing both
AC and battery power from the units.
3. Remove all connections from the following PC4820
terminals; OUT (for OUT DOOR 1), Door (for
INPUTS DOOR 1) and AUX+.
4. On the selected PC4820, connect a short from the
terminals marked as OUT (for OUT DOOR 1) and
Door (for INPUTS DOOR 1). Next connect a 5600 ohm
resistor from the Door input to the AUX+ terminal.
5. Restore AC power to the PC4820 module(s).
6. Wait for 10 seconds then remove AC power to the
PC4820 module(s).
7. Remove the connections made in Step 4.
8. Any terminal connections removed in Step 3 can now
be reconnected.
9. Restore AC and battery power to the PC4820
module(s)
10. Restore AC and battery power to the PC4010/4020
control panel.
The PC4820 will now indicate to the PC4010/4020 that a
hardware default has been performed and the PC4010/
4020 will retransmit all programming information back
to the PC4820 modules. All keypads on the system will
beep quickly 16 times to indicate that the programmed
information has been sent to the PC4820.
Be sure to remove all connections involved in the hardware
default procedure when the hardware default has been
completed.
NOTE
: When performing a hardware or software
default of the PC4010/4020 be sure to also perform a
hardware default on the PC4820. This will insure that
all unwanted programming has been removed from
the module.
4.2 Diagnostics via VTAL LED (L1)
The VTAL LED (located on the right hand side of the circuit
board) of the PC4820 is capable of providing diagnostics
information for various conditions that may appear on
the module.
• Steady flash (once per second) indicates normal
operation.
• Fast flash indicates that communication to the
PC4010/4020 has been lost (Combus fault).
• On steady (1/2 second) indicates data is being
received from an access card reader.
