Motorola RADIUS GM300 Instrukcja serwisowa - Strona 25
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Disassembly/Re-assembly
Alignment
Alignment
The advanced design and manufacturing procedures
eliminate the need for traditional tuning tasks.
All the circuits in the GM300 radio have been aligned
at the factory with specialized equipment.
Alignment in the Þeld should not be attempted or nec-
essary.
Programming
The GM300 radios can be programmed in the Þeld to
these parameters:
¥ Receive and transmit frequencies
¥ Transmit Frequency Adjustment (warp)
¥ PL or DPL encode and decode Codes
¥ Transmit Power Output
¥ Transmit Deviation
¥ Time Out Timer
ConÞguration information for programming these
parameters is contained in the GM300 RADIO SER-
VICE SOFTWARE package HVN8177 Version
B04.03.00 (or later versions )for 5.25 inch drives and 3.5
inch drive diskettes must be used.
A personal computer (P.C.) and the appropriate soft-
ware diskette will be required in addition to the items
listed in Recommended Test Equipment.
We strongly suggest the servicer become familiar with
the programming techniques applicable to the GM300
radios.
1. High pitch Beep (900Hz 119ms) on initial turn on or
when key is pressed.
2. Low pitched tone (163Hz) for 5 seconds following
turn on.
3. Low frequency (163Hz) continuous tone present
whenever radio is on.
4. Low pitch beep (300Hz 200 MS) when a button is
pressed.
5. Low frequency (150Hz or 112.5Hz) continuous tone
while PTT is held.
1-4
Table 1-2. Error Tones
Tone
Recommended Test Equipment
R2001D: Communication Systems Analyzer
or
R2200B: Service Monitor
R1011B: Power Supply
R1037A: Digital Multimeter
or
R1024B: Digital Multimeter
Board Replacement and Calibration
Replacement of the Logic board, RF board, or Power
AmpliÞer requires that recalibration must be per-
formed with the Motorola Radio Service Software. The
procedures for calibration are covered in the GM300
Radio Service Software Manual.
Failure to perform the required calibration procedure
will affect the performance of the Reference Oscillator,
RF Power Leveling and Protection, and Transmitter
Modulation over frequency and temperature. An
uncalibrated radio may not comply with your Local
Communications Agency rules and may be unreliable
at temperature extremes.
The GM300 radio was designed to be serviced at the
board level only. There are a number of non-Þeld ser-
viceable parts in the radio. Field replacement of these
parts will affect the factory calibrated numbers on the
tuning label. If any of these parts fail, board replace-
ment is the only way to service the radio.
1. Normal operation - no error.
2. Code plug error. For all code plug errors try to re-pro-
gram radio. If this does not clear the fault or if prob-
lem recurs, replace the logic board
3. Logic board failure. Replace logic board.
4. Button is not allowed in the current operating condi-
tion. Change operating condition (select another
mode, etc.)
5. Transmit is not allowed. If it was time-out-timer, you
may release PTT then continue your call.
68 No.
Name of Manual
Problem
March, 1997