Bosch D9412GV2 - Page 112

D9412GV2/D7412GV2 | Troubleshooting Guide | 3.0 Troubleshooting
112 Bosch Security Systems, Inc. | 11/05 | F01U011024B
D E F D G H
Refer to the auxiliary power supply
manufacturer’s troubleshooting procedures.
1. Reconnect all negative conductors to the
auxiliary power supply’s negative terminal.
2.
Connect one positive conductor to the power
supply’s positive terminal, then repeat the
voltage check.
3.
Repeat this process with each positive
conductor until you identify the conductor that
causes the DVM to measure 0 VDC.
4.
Disconnect that conductor from the power
supply.
5.
Set the DVM to measure resistance.
6. Connect the black DVM lead to the power
supply’s negative terminal, and connect the red
DVM lead to the affected conductor.
Does the DVM indicate a short?
D G H
Refer to
TTP49 Wire Shorted to Ground on
page
106.
Refer to
TTP46 Shorted Wiring on page 98.
There is an open in the wiring between the auxiliary power
supply and the device or module. Refer to
TTP47 Open
Wiring
on page 100.
Figure 62: Auxiliary Power Supply Wiring Diagram
28
27
26
25
24
23
GND
AUX
Device/Module
Control Panel
Auxiliary
Power Supply
- +