Bosch D9412GV2 Troubleshooting Manual page 103

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A B
The problem is AC induction, possibly caused by
high-voltage AC that runs parallel to part of this wire.
Select the conductor that produced the highest AC
voltage reading.
For the rest of this TTP, leave the DVM
connected to the conductor that produced the
highest AC voltage reading.
Is there more than one piece of equipment
connected to this conductor, or are there wire
splices on the conductor?
Disconnect the other end of the conductor you
are troubleshooting.
Does the DVM still indicate >1 VAC?
The problem is the location where the
equipment is installed. Relocate the
equipment.
Re-run the wire, avoiding all sources of high-
voltage AC. Reconnect all equipment on the
circuit.
IMPORTANT: The rest of this procedure uses a
half-split troubleshooting approach. By answering
the following question, you divide the circuit in
half to determine the half of the circuit that is the
source of AC induction. This half is the "affected
circuit".
By repeating the question, you divide the affected
circuit in half again to determine the half of the
affected circuit that is the source of AC
induction. That half becomes the affected circuit.
Repeat the following question as many times as
necessary until you reduce the affected circuit
enough to identify the source of AC induction.
Refer to Figure 59
After you identify the source of AC induction, run
the wire away from the source of AC induction.
During the rest of this TTP, if the TTP states
"repeat the process and question above",
return to this location in the TTP.
Disconnect the middle device or splice in the affected
circuit.
Does the DVM read >1 VAC?
A D E
Bosch Security Systems, Inc. | 11/05 | F01U011024B
D9412GV2/D7412GV2 | Troubleshooting Guide | 3.0 Troubleshooting
on page 105.
A D E
Refer to Figure 59
is between where you disconnected the device
or splice and either:
- the end of the circuit, or
- the location of the device or splice you
disconnected the last time the DVM
indicated >1 VAC. Reconnect the device
or splice, then repeat the process and
question above.
Refer to Figure 59 on page 105. The problem is
between where you disconnected the device or splice
and either:
- the location of the DVM, or
- the location of the device or splice you
disconnected the last time the DVM did not
indicate >1 VAC. Reconnect the device or
splice, then repeat the process and question
above.
Call Bosch Technical Support for assistance.
on page 105. The problem
103