User's Manual

Troubleshooting VMT Configurations
The following procedures are for fault determination with Vehicle Mount Talkman (VMT) when powered
by the vehicle power system.
The following procedures can be done with minimal Vocollect technical support to determine the specific
malfunction of a non-working VMT:
• Be sure the vehicle battery is charged and working, turn-on the vehicle and assure it starts. If the
vehicle does not start then the vehicle should be serviced by qualified personnel.
• If VMT was installed after the vehicle key switch, ensure it powers on when the vehicle is turned on.
Vocollect recommends the VMT be installed before the vehicle key switch to ensure it is always getting
power when the vehicle has a battery.
• If another Talkman device is available, substitute it for the non-working Talkman. If this substitute
Talkman also does not work, it is likely the problem is with the VMT power system. However, if the
substitute works, then it is likely that the original device is in need of service.
• Exchange the VMT Battery Adapter from the non-working VMT with a known working Battery
Adapter. If the VMT works with the new Battery Adapter, then the original Battery Adapter is likely
in need of replacement.
The following steps will need qualified Vocollect technical support to determine the specific malfunction
of a non-working VMT:
Gain access to the power supply used by the VMT (this is likely mounted inside the vehicle). Remove
the four () screws that attach the lid of the power supply to expose the input and output wiring as
illustrated in the diagram below.
• Test the input terminals to determine if voltage is being supplied and matches that of the vehicle
power system.
• If the voltage supplied does not match that of the vehicle power system, professional attention is
needed to determine why the vehicle power system is not providing the correct voltage.
• If no voltage is being supplied, check the fuses on the input cable, replace if they are blown. If the
fuses immediately blow after replacement, determine if the input cable to the VMT power supply
has a short circuit. If there is no short then it is likely there is a problem with the VMT power
supply.
• If no voltage is being supplied and the fuses are not blown, check the integrity of the input cable
for a break. If there is a break, replace the cable. If not, there is likely a problem with the vehicle
power system that needs professional attention.
• If input voltage is being supplied to the power supply, check the output voltage.
Confidential: For informational use by Vocollect Resellers and customers only
236 | Vocollect Hardware Documentation