Motorola RADIUS GM300 Service-Handbuch - Seite 25

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Disassembly/Re-assembly

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

R2200B: Service Monitor

R1011B: Power Supply

R1037A: Digital Multimeter

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