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User's Manual

ManualsBrandsMotorola Solutions ManualsElectronicsVRS750--Vehicular Repeater System
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Common Power-Up Problems
1. "ERR 12/10" message is displayed on power-up.
o The VRS mobile interface cable is disconnected or bad.
o Verify the VRS Firmware is correct. Immediately after power up press the HOME
button on the control head five (5) times and verify the correct firmware version is
displayed.
o Check all regulators for proper voltages. The 9.6-volt regulator is accessible at
C199.
Do not probe U118 pin1 when the unit is powered. U118 will shut down without any
recovery if pins 1 and 2 are accidentally shorted to each other.
2. "VRS BOTH" message does not display momentarily on control head when VRS
is enabled.
o VRS is receiving a VRS frequency signal. (VRS will not display "VRS BOTH" or
transmit Single Tone if there is RF activity on the VRS frequency.)
o Check the VRS750's squelch setting.
3. "VRS 001" message is displayed on power-up.
o VRS Frequency Band in the VRS Personality of the ASTRO Mobile codeplug is
incorrect.
o Check the VRS750's codeplug for incorrect programming.
o Re-flash the VRS750 with new firmware using the VRS750 Upgrade Tool.
Common Operational Problems
1. Common Portable-to-Base Repeat Problems.
o Check portable for correct transmit frequency and PL.
o Check portable for low battery.
o Check VRS internal RF cable for loose connection.
2. Common Base-to-Portable Repeat Problems
o Check portable for correct receive frequency and PL.
o Check mobile for correct frequency.
o Check that portable is set for the bandwidth corresponding to the VRS.
o Check VRS internal RF cable for loose connection.
Disassembly and Reassembly
To access the VRS main board, perform the following steps using the reference number
from the exploded view as a guide to identify the parts specified:
Accessing the Internal components of the VRS.
Remove the top cover (X) from the chassis (X) by prying it over the clips in the left and
right rear corners of the chassis.
Removing and Reinstalling the PC Board Assembly (X) from the Chassis (X).
1. Remove the eight machine screws (X) (includes the screw used for the voltage
regulator) from the pc board.
2. Remove the retainer for the RF connector (X).
3. Lift the pc board (X) out of the chassis (X).
4. To reassemble the pc board and the chassis, reverse the preceding steps.