Motorola VRS750 Service Manual page 62

Common Power-Up
Problems
50
• ERR 12/84—CONFIG register corruption. The unit should be
flashed with the correct version software. If this fails to correct
the problem, the transceiver should be replaced.
• ERR 12/88—HC11 RAM failure. Replace the Transceiver.
• VRS 001—VRS Synthesizer out of lock error. See "Common
Power-Up Problems" section on page 50 for possible
solutions. If the solutions in the "Common Power-Up
Problems" section do not fix the error then the transceiver
should be replaced.
• PROG VRS—The VRS750 is in programming configuration.
This is only an error if the programming cable is not plugged
into the front connector of the VRS750. Reset the ASTRO
Mobile radio and if the problem is not corrected check P101
Pin 9 and the PROG_SENSE line for any shorts to ground.
3. Enable the VRS unit by pressing the VRS button on the mobile
control head.
• "VRS BOTH" must be displayed momentarily on the control
head and the indicator must light.
• Verify a short single tone burst is transmitted upon activation
at approximately 3 KHz deviation for a channel spacing of
25 kHz.
NOTE: Because of the short burst, it may be necessary to verify
the deviation on the modulation scope instead of the
usual deviation meter. Activation may be repeated by
pressing the VRS button once to disable the unit and
again to reactivate it.
1. "ERR 12/10" message is displayed on power-up.
• The VRS mobile interface cable is disconnected or bad.
• 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.
• Check all regulators for proper voltages. The 9.6-volt regulator
is accessible at TP116.
CAUTION: 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.
• 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.)
• Check the VRS750's squelch setting.
3. "VRS 001" message is displayed on power-up.
• VRS Frequency Band in the VRS Personality of the ASTRO
Mobile codeplug is incorrect.