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Maxon SP-1102 Скачать руководство пользователя страница 17

Service Manual

SP - 1402

Page 17 of 35

Disassembly and Re-assembly of the Radio

In order to carry out the following test and alignment procedures it will be necessary to gain

access to the inside of the radio.

Care should be exercised when opening up the radio for maintenance or repair.

Removing and replacing the main cover

a)

Turn the radio over, so that the radio is upside down.

b)

Remove the ANT and volume knob.

b)

Remove the two holding screws.

c)

Lift the cover off.

d)

Replace the main cover by reversing the above procedure.

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Содержание SP-1102

Страница 1: ...Service Manual SP 1402 Page 1 of 35 SP 1402 Service Manual...

Страница 2: ...ulletins or formal communication as this may invalidate any warranty guarantee or type approval 8 USE the supplied microphone only Other microphones have different pin assignments and may damage the t...

Страница 3: ...tents SP 1402 Introduction 4 Specification 6 Maintenance and Repair 10 Transmitter Performance Tests 13 Detailed Functional Description 22 Troubleshooting 26 Schematics and PCB layout Index 28 Parts L...

Страница 4: ...issued in the form of replacements and or additional pages It is important that anyone working on a product has all the relevant information Therefore you should incorporate amendments to this manual...

Страница 5: ...t components free of charge C Category C Engineering Bulletins are for improvement or modification to equipment manufactured by Maxon Dealer Distributor to modify affected units in the field on the ne...

Страница 6: ...uencies 45 1MHz 455 KHz Number of channels 16 Frequency source Synthesizer Frequency stability 0 0005 30o C to 60o C Power supply Rechargeable Li on Battery 7 5 VDC 10 Current consumption Off 1 mA Sta...

Страница 7: ...Within 1 3dB of limit wrt 1 kHz 300Hz to 2 55 kHz for 12 5kHz channel spacing 300Hz to 3 0 kHz for 20 25kHz channel spacing TX Spurious Emission conducted and radiated Below 1GHz Better than 36dBm 1...

Страница 8: ...Performance without Sub Audio Modulation Sensitivity 12dB SINAD nominal UHF Better than 117dBm Amplitude Characteristic Within 3dB Co channel Rejection 12 5 kHz From 0dB to 12dB 25 kHz From 0dB to 12...

Страница 9: ...an 47dBm Audio Power 500mW max Internal 4 speaker AF Distortion 1 kHz 5 nominal RX Hum and Noise Method as TIA EIA 603 12 5 kHz 34dB No PSOPH 25 kHz 40dB No PSOPH Sub Audio Tones CTCSS Tone Range 67 t...

Страница 10: ...cturers Throughout this book reference will be made to the use of the Communications Test Set Where applicable the equivalent discrete item of test equipment may be used For example if measuring power...

Страница 11: ...Prerequisites For the following tests signal generator modulation level should be set to Average System Deviation i e 60 of maximum system deviation The level should therefore be set to N BAND 1 5 kH...

Страница 12: ...ncies prior to aligning the UHF scanning mobile radio Test Equipment Connection Test equipment connections for performance and Alignment tests are shown in figure 1 Connect the power supply leads as f...

Страница 13: ...greater than 65 of the level measured above Frequency Error a Using the frequency counter check that the transmit frequency is within 750Hz of the frequency which is programmed into the radio Distort...

Страница 14: ...io receiver Select the required frequency to be measured without CTCSS enabled a Connect the RF signal generator modulated with a 1 kHz tone to the radio b Set the frequency of the RF signal generator...

Страница 15: ...o Output a Set the RF signal generator to 1mV Pd 47 0dBm and the tone and deviation as above b Connect the audio power meter set to 8 to the external speaker socket on the radio Note The audio power m...

Страница 16: ...ion Frequency Table CH RX MHz Option TX MHz Option Band Power 1 455 00000 None 455 00000 None S H 2 469 97500 None 469 97500 None S H 3 440 02500 None 420 02500 None S H 4 469 97500 None 469 97500 Non...

Страница 17: ...sary to gain access to the inside of the radio Care should be exercised when opening up the radio for maintenance or repair Removing and replacing the main cover a Turn the radio over so that the radi...

Страница 18: ...Service Manual SP 1402 Page 18 of 35 Alignment Alignment drawings required Fig 3...

Страница 19: ...at the VCO tuning voltage at TP1 Please see fig 3 is 0 7 1 0V CV901 c Select channel 8 469 975MHz d Check that the voltage at TP1 is 3 5 4 0V Transmitter Alignment TCXO a Select channel 1 440 025MHz b...

Страница 20: ...tion to 12 5 kHz channel spacing 1 5 kHz deviations 25 kHz channel spacing 3 kHz deviations e Monitor the audio output level and the distortion setting the volume control to 1Vrms Squelch a Connect th...

Страница 21: ...external speaker socket on the radio d Press the monitor if radio is muted button and set the volume control to mid range e Set the RF signal generator deviation to 12 5 kHz channel spacing 1 5kHz de...

Страница 22: ...pass filter Unwanted harmonics are reduced by 36 dBm Antenna Switch When transmitting the diodes D9 and D5 are forward biased enabling the RF signal passage to the antenna D5 is shorted to ground inh...

Страница 23: ...L14 605 607 These are frequency range 440 025 to 469 975 MHz First mixer and first IF amplifier This stage is mixed signals the signal from front end RF amplified through band pass filter fed to the g...

Страница 24: ...no audio signal is present The squelch circuit consists of IC6 and RV3 RV7 and their associated components The noise signal form pin 30 of IC2 is amplified by internal amp of IC2and then fed into RV7...

Страница 25: ...e for through to produce the DC turning voltage for VCO circuit Reference frequency LPF The loop filter contains R98 C113and C131 LPF settling time is 12mS with 1 KHz frequency This also reduces the r...

Страница 26: ...ective mixer 4 IF IC 5 VCO level drop 6 Change of 1 st local frequency 1 check D5 D9 2 Check Q15 3 CheckQ23 Q34 4 Replace IC2 5 RX VCO level 2dBm 6 Retune TCXO Defective RX 1 VCO frequency change or l...

Страница 27: ...onal status of the radio The possible audible and visual warnings are LCD display LED colour Audio tone Power on N A Melody Busy Orange N A Correct call Green N A Transmit Red N A Scan Green flash N A...

Страница 28: ...1402 Series Radio Associated main schematics may be found in the wallet at the rear of this binder Order of drawings Drawing description Size of drawing Schematics 1 SP 1402Digital Schematic A4 2 SP 1...

Страница 29: ...Service Manual SP 1402 Page 29 of 35 Schematics and PCB layout Index...

Страница 30: ...Service Manual SP 1402 Page 30 of 35 Schematics and PCB layout Index...

Страница 31: ...Service Manual SP 1402 Page 31 of 35 Schematics and PCB layout Index...

Страница 32: ...Service Manual SP 1402 Page 32 of 35 Schematics and PCB layout Index...

Страница 33: ...402 Page 33 of 35 Parts List Exploded View The following pages detail the mechanical and electronic parts for the Maxon SP 1402 Handportable Radio Refer to Exploded diagram for the SP 1402 1102 Mechan...

Страница 34: ...Service Manual SP 1402 Page 34 of 35 Parts List...

Страница 35: ...of 35 Contact details Should you have any queries regarding this manual or the information within it please contact Tecnet International Inc 11535 W 83rd Terrace Lenexa KS 66214 Tel 913 859 9515 Fax...

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