Bosch DS7400Xi Reference Manual page 91

General System Problems (Continued)
Symptom
#87 display = Aux Power Fault
#87 display = Keypad Fault
#87 display = Ground Fault
#89 display = System Fault 04
#87 display = AR IB Queue Full
#89 display = System Fault 51
#87 display = AR Host Down
#89 display = System Fault 52
#87 display = AR Unreg. Modem
#89 display = System Fault 53
#87 display = AR Power Fail
#89 display = System Fault 54
#87 display = AR Network Lost
#89 display = System Fault 55
#87 display = AR Modem HW Err
#89 display = System Fault 56
#87 display = AR Modem SW Err
#89 display = System Fault 57
#87 display = AR Opt. Bus Err
#89 display = System Fault 58
#87 display = AR Corrupt MSG
#89 display = System Fault 59
Unable to arm the system.
DS7400Xi ( 4+) Reference Guide
Probable Cause
The auxiliary power output has been
shorted.
a) The keypad wiring is defective.
b) A keypad is missing.
c) A keypad has been programmed, but is
not intended in this system.
There is a short to ground somewhere in
the system.
The message queue in the RF modem is
full and no messages can get out to the
radio network.
The central station receiver has ceased to
be available to the network.
The modem is not registered through all
parts of the network.
There is a possible problem with the
DS7416i Module.
The DS7416i Module has lost contact with
the radio network.
There is a possible problem with the radio
modem.
The DS7416i Module is having trouble
communicating with the radio modem.
The panel can no longer communicate
with the DS7416i Module.
The communication between the panel
and the DS7416i Module is getting
corrupted.
a) Zone(s) faulted.
b) If an AC failure exists, you must force
arm.
Copyright © 2007 Bosch Security Systems, Inc.
Possible Solution
Remove wiring from auxiliary power and check for
shorts.
a) Check keypad operation and wiring.
b) Install a keypad.
c) Remove from programming (3131-3138).
Disconnect field wiring from each terminal while
watching the keypad display. When the keypad power
LED stops flashing, you have found the wire that is
causing the ground fault.
Note: The LED will not stop flashing if there is
another system fault present.
If there is no keypad nearby, or another control
problem exists, you can use a volt-meter to find the
ground fault:
1) Connect the negative lead of a volt-meter to the
panel ground terminal.
2) Connect the positive terminal to the Aux Power –
terminal.
You should read -4.5 to -7.5 Volts DC. A reading
considerably higher or lower indicates a ground
fault.
Disconnect field wiring from each terminal while
watching the meter. When the voltage reading
returns to between -4.5 and -7.5 VDC, you have
found the wire that is causing the ground fault.
Check RF coverage of the unit and check for RF
noisy environment.
Contract the central station and notify of status.
Contact the network administrators or technical
service.
Return for service.
Check the location and coverage of the unit.
Replace the unit.
Check for noisy environment and replace the unit if
the problem continues.
Check the wiring between the DS7400Xi and the
DS7416i Module.
Check for noisy environment, and check the wiring
between the DS7400Xi and the DS7416i Module.
a) Determine the cause of the problem and clear
the indicated zone(s).
b) Enter an arming sequence, then press the
Bypass key during a 5 second beep.
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