D9412GV2/D7412GV2 | Troubleshooting Guide | 3.0 Troubleshooting
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Bosch Security Systems, Inc. | 11/05 | F01U011024B 111
TTP51: Device or Module Does Not Have
Power
A B C
Procedure
From the device or module that does not have power, trace
its power wiring to the power source.
Is the device or module powered by an auxiliary power
supply (refer to
Figure 62 on page 112)?
1.
Set your digital voltmeter (DVM) to measure
VDC.
2.
Connect the red DVM lead to the control panel
terminal that provides positive (+) power to the
device or module.
3.
Connect the black DVM lead to the control
panel terminal that provides COMMON
(negative) power to the device or module.
Does the DVM measure 12 to 13 VDC?
Remove all conductors connected to the
control panel terminals you used for the
voltage check in the previous step, then check
the voltage again at the same power terminals.
Does the DVM measure 12 to 13 VDC?
You might have to wait 5 minutes for the
control panel to restore 12 to 13 VDC to
those terminals.
1. Remove the control panel terminal
blocks to which the positive (+)
and COMMON (negative)
conductors were connected.
Ensure that the terminal block
connector pins are not bent or
broken.
2.
If the problem still exists, replace
the control panel.
A B C
The problem is on one of the conductors
connected to the control panel’s positive (+)
terminal that powers the device or module.
1.
Connect all COMMON (negative)
conductors to the control panel’s
COMMON terminal.
2.
Connect one positive (+) conductor to
the control panel’s positive (+) terminal,
then repeat the voltage check.
3.
Repeat until you identify the conductor
that causes the DVM to measure 0 VDC.
4.
Disconnect that conductor from the
control panel again.
5.
Set the DVM to measure resistance.
6.
Connect the black DVM lead to the
COMMON terminal and the red DVM
lead to the affected positive conductor.
Does the DVM measure a short?
Refer to
TTP49 Wire Shorted to
Ground on page 106.
Refer to
TTP46 Shorted Wiring on page 98.
There is open wiring between the control panel and
the device or module. Refer to TTP47 Open Wiring
on page
100.
Connect the red digital voltmeter (DVM) lead on the auxiliary
power supply’s positive (+) terminal. Connect the black
DVM lead to the power supply’s negative (-) terminal. Set
the DVM to measure VDC.
Does the DVM measure 12 to 13 VDC?
Remove all conductors from the auxiliary power
supply. Repeat the voltage check.
Does the DVM read 12 to 13 VDC?
D E F
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