Motorola S803 Manuale di Servizio

SABERHandie-Talki e Portable RadiosTheory/Maintenance Manual68P81044C05-A

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ACCESSORIESMotorola offers a variety of accessories for SABER radios to increase communications efficiency. Many ofthe accessories available are liste

ACCESSORIES (cont.)Battery Chargers:NTN4734A Single-Unit, Rapid Rate, 115-VoltNTN4786A Single-Unit, Rapid Rate, 220-VoltNTN4796A Multi-Unit, Rapid Rat

SPECIAL TERMS AND ABBREVIATIONSThe construction, technology, and circuits in the SABER radio require the use of the following special termsand abbrevi

SABER Handie-Talkie®Portable RadiosTMCONTENTSFOREWORD...

1. INTRODUCTIONThe frequency-synthesized SABER Handie-Talkieportable radios are advanced-design, microcomputer-based transceivers that incorporate the

can be controlled by the coded/clear selector switch,or by “strapping” on a per-channel basis using theRadio Service Software. Regardless of thecoded/

3BATTERY CHARGING1. AVAILABLE CHARGERSAvailable chargers include a single-unit desk topcharger, a single-unit Porta-Pocket charger, and multi-unit cha

a. Obtain a Radio Housing Adapter (Motorola partnumber RTL-4225A) from your nearest Area PartsOffice.b. Connect the appropriate 20-ohm or 11-ohm loadr

THEORY OF OPERATION1. INTRODUCTIONThis section of the manual provides a functionaldescription of the SABER radio. First, basic functionsare discussed,

sensing circuit of PA U202, and (uhf radios only) thebase of Q200.RX 5V, identified by the "➅" symbol, is also provid-ed by U201's inte

er/prescaler (U300), and the signalling IC (U700).The CORE uses its serial peripheral interface(SPI) subsystem to program these ICs. The micro-process

also part of the audio filter IC (U101). The demod-ulated, filtered, hard-limited signal is sent (U101,pin 28) over the PL DECODE line to the COREproc

c. Digital-to-Analog (D/A) Converter (U200)The digital-to-analog (D/A) converter, U200, is amultifunction CMOS integrated circuit containing two7-bit

As in the vhf models, the TX/RX antenna switch-ing is controlled by the R/T line (U201, pin 9). Whenthe R/T line is high (5V), the RX 5V regulator in

LIST OF ILLUSTRATIONSFIGURE TITLE PAGE1. Typical Battery Construction, Rear View...

g. ReceivingThe signal received at the antenna is routedthrough the filter/detector/switch module (U203) andapplied to the receiver rf front end modul

loss of about 6 to 7dB through the mixer, the i-f ampli-fier provides about 10B of gain, and the crystal filterhas about 3.5dB insertion loss. The cry

the status of the R/T line ("1" = RX; "0" = TX).Depending on the status of the MIC SELECT line(0Vdc = external; 5Vdc = internal),

i. COPE Microcomputer (U502)Refer to Figure 3 and the 2k and 8k schematicdiagrams in the applicable service manual.The control of peripheral electron

Pins 9 through 16 make up a bidirectional data busbetween the COPE and the EEPROM. These lines arenormally at a logic low unless data is being accesse

Each segment waveform drives three display seg-ments ( the small lines or bars that make up the indi-vidual characters), or annunciator symbols (such

remove the solution and dry the radio. Make sure thatno water remains entrapped near the connectors,cracks, or crevices.(2) Cleaning Internal Circuit

in failures occurring weeks or months later.Therefore, special precautions must be taken to pre-vent device damage during disassembly, troubleshoot-in

19Figure 4. Troubleshooting, Programming, and Test Equipment Setup DetailMAEPF-19758-OTable 2. Test EquipmentMOTOROLA MODEL NUMBER DESCRIPTION CHA

a. Recommended Test EquipmentThe list of equipment contained in Table 2 includesall the standard test equipment required for servicingtwo-way portable

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1. INTRODUCTIONServicing the SABER Series radio requires thelocalization of the malfunctioning circuit before thedefective component can be isolated a

grams in the service manual. When making these volt-age checks, pay particular attention to any notes thatmay accompany the voltage reading of a parti

61 of U400.If there are no indications on either step (a) or (b),check for the presence of 5Vdc on the commonline of the frequency switch.(5) Verify w

NOTEBoth number 1 and number 2 regulators must beoperational for the microcomputer (U400) to func-tion properly.(4) Check that the voltage at the coll

(1) Perform step e (6) before continuing with this pro-cedure.(2) Check the output (pin 14) of synthesizer U300:(a) While keying the radio, measure, w

a.(For uhf radios only). The uhf frontend module (U2) and the RX 5Vdcregulator (U201) will not function if theFDS module (U203) is not in place.Turn t

This will affect distortion measurements.(4) (a) Inject a modulated 1kHz signal (-30dBm) atcapacitor C22. Adjust the radio for rated audio(3.7Vac) and

28NOTES

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