Motorola VRS750, Service Manual

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• Check the VRS750’s codeplug for incorrect programming.
• Re-flash the VRS750 with new firmware using the VRS750
Upgrade Kit.
Common Operational
Problems
1. Common Portable-to-Base Repeat Problems.
• Check portable for correct transmit frequency and PL.
• Check portable for low battery.
• Check VRS internal RF cable for loose connection.
2. Common Base-to-Portable Repeat Problems
• Check portable for correct receive frequency and PL.
• Check mobile for correct frequency.
• Check that portable is set for the bandwidth corresponding to
the VRS.
• Check VRS internal RF cable for loose connection.
Disassembly &
Reassembly
Procedures
The disassembly/reassembly procedure covers all VRS750 models.
CAUTION: Refer to the “Safe Handling of CMOS Integrated-Circuit
Devices” section at the beginning of this manual prior to
disassembling the radio.
Disassembly to Interface
Board Level
Remove Front Housing
1. Disconnect the Programming Connector Cover by squeezing the
top and bottom of the connector together, disengaging the
bottom snap then the top and pulling straight out.
2. Remove the gasket within the recessed area for the 18-pin
programming connector.
3. Insert a small flat-blade screwdriver or like instrument in the side
groove at the interface between the remote front housing and the
main chassis (see Figure 25). Press while pulling the housing away
from the chassis until the snap releases. Repeat the operation on
the opposite side.
4. Pull front housing off the chassis.
5. Remove white retainer (p/n 4205395X01) from the header (or
front housing).
6. Remove the 18 pin connector (2805347X01) from the front of the
chassis.
7. Remove the front cover gasket.