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Maxon SP-1402 Service Manual

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Service Manual
SP - 1402
SP - 1402
Service Manual
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Summary of Contents for Maxon SP-1402

  • Page 1 Service Manual SP - 1402 SP - 1402 Service Manual Page 1 of 35...
  • Page 2 Service Manual SP - 1402 Warnings WARNING! NEVER connect the transceiver to an AC outlet. This may pose a fire hazard or result in an electric shock. NEVER operate the radio transmitter without a suitable artificial load or antenna connected. NEVER connect the transceiver to a power source of more than 8.4V DC such as a 13.8V battery.

  • Page 3: Table Of Contents

    Service Manual SP - 1402 Contents 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 List & Exploded View ....................34 Contact details ........................

  • Page 4: Introduction

    SP - 1402 Introduction This Maxon Service Manual is a comprehensive guide to the maintenance and field repair of this equipment. It covers all versions of the SP-1402 Series radio(s). Before using this manual please read the whole of this introductory chapter, this will help you to make the best use of it. If you have not done so already, please also read the warnings immediately in front of this chapter before proceeding any further.
  • Page 5 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 next service call. Maxon will supply components free of charge. Please place these at the back of this manual and refer to them before carrying out any work.

  • Page 6: Specification

    Service Manual SP - 1402 Specification General Performance specifications FCC Compliance Frequency coverage 440.000~470.000 MHz Channel spacing N-BAND 12.5KHz S-BAND 25KHz RF output power Modulation type Audio power 500mW(Ext with 4 ohm) Intermediate frequencies 45.1MHz & 455 KHz Number of channels Frequency source Synthesizer Frequency stability...
  • Page 7 Service Manual SP - 1402 Transmitter Test Method is TIA / EIA-603 unless stated. Performance without Sub-Audio Modulation. Power Output Low Power 1W Audio Freq. Deviation Nominal Peak 12.5 kHz +/-2.3KHz +/- 2.5KHz 25 KHz +/-4KHz +/-5KHz With or without audio sub-modulation (10% peak deviation) Audio Characteristics Modulation Type F3E Within +1/-3dB of limit wrt 1 kHz:...
  • Page 8 Service Manual SP - 1402 Sub Audio Tones - CTCSS Tone Range 67 to 250.3Hz @ 0.3% accuracy Nominal Tone 15% (10-20%) Pk Sys Dev. Sub Audio Tones - DCS Normal and Inverted Tone Standard 15% (3%) Pk System Dev. Tone Deviation Receiver Test Method is TIA / EIA-603 unless stated.
  • Page 9 Service Manual SP - 1402 Rx Spurious Emissions (radiated) - nominal 9 kHz – 1GHz Better than –57dBm 1GHz – 4GHz Better than –47dBm Audio Power 500mW max. (Internal 4Ω speaker) AF Distortion 1 kHz < 5% (nominal) RX Hum and Noise Method as TIA / EIA-603 12.5 kHz >34dB No PSOPH...

  • Page 10: Maintenance And Repair

    Service Manual SP - 1402 Maintenance and Repair Introduction This section covers the tests which should be undertaken prior to customer handover. All of the following tests can be carried out without having to gain access to the interior of the radio. Recommended Test Equipment The alignment and performance test procedures assume the use of the following equipment.
  • Page 11 Service Manual SP - 1402 Test Equipment Configuration (Fig. 1) 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 kHz for 12.5 kHz channel spacing S-BAND 3 kHz for 25 kHz channel spacing Page 11 of 35...
  • Page 12 Service Manual SP - 1402 EEPROM programming Ensure that the EEPROM has the required customer parameters programmed, otherwise ensure that a test EEPROM is programmed with at least the lowest, middle and highest RX/TX frequencies prior to aligning the UHF scanning mobile radio. Test Equipment Connection Test equipment connections for performance and Alignment tests are shown in figure 1.

  • Page 13: Transmitter Performance Tests

    Power Output Connect the transmitter to the Communications Test Set (CTS) with the power meter set to read 5W for the SP-1402 Set the power supply to 7.5Vdc and connect a dc voltmeter across the power supply to monitor the supply voltage.
  • Page 14 Service Manual SP - 1402 Release PTT. When CTCSS and DCS performance checks are also required, ensure that the lowest, middle and highest RX/TX frequencies include: (see below for suggested test channel set- up). Lowest RX/TX freq. ch. 67.0 Hz CTCSS Middle RX/TX freq.
  • Page 15 Service Manual SP - 1402 Squelch Ensure that both the radio and the signal generator are set to the appropriate channel spacing. With the above setting, reduce the RF level to –130dBm (speaker should be muted). Adjust the RF output level until the radio unmutes. Sinad reading should be in the range of 8db to 12db.
  • Page 16 Service Manual SP - 1402 Alignment Warnings Any repairs or adjustments should only be made by, or under the supervision of a qualified radio- telephone service technician. Caution This radio contains static sensitive devices. Static safe precautions should be observed; in particular we would recommend the use of a suitable floor mat, table mat, bonding cords and a wrist strap.
  • Page 17 Service Manual SP - 1402 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 Turn the radio over, so that the radio is upside down.
  • Page 18 Service Manual SP - 1402 Alignment Alignment drawings required (Fig.3) Page 18 of 35...
  • Page 19 Service Manual SP - 1402 PLL Alignment TX VCO Select channel 1. (440.025MHz) Set the PTT switch to on. Check that the VCO tuning voltage at TP1 is 0.7~1.0V. (CV1) Set the PTT switch to off. Select Channel 8. (469.975MHz) Set the PTT switch to on and check that the voltage at TP1 is 4.0~4.5V.
  • Page 20 Service Manual SP - 1402 Peak Deviation Select channel 1. (440.025MHz) Set the PTT switch to on. Set audio generator to be 1KHz 100mVrms and connect to radio external jack. Adjust the ±2.0-2.5KHz DEV. (RV2) and check S-band to get ±4.0-4.5KHz DEV. Receiver Alignment The receiver is, by design, a broadband device.
  • Page 21 Service Manual SP - 1402 Receiver Performance Tests SINAD or noise quieting sensitivity performance tests may be used to test the sensitivity of the receiver. Both tests are given below. 12dB SINAD Sensitivity The SINAD performance test may be used to test the sensitivity of the receiver. Connect the RF signal generator, modulated with a 1 kHz tone, to the radio.

  • Page 22: Detailed Functional Description

    Service Manual SP - 1402 Detailed Functional Description UHF Transmit The transmitter is comprised of: Buffer Power AMP Low Pass Filter Antenna Switch APC (Auto Power Control) Circuits Buffer VCO output level is 0dBm and amplified to +16dBm (UHF)/(VHF). The buffer consists of Q22, 12 Power AMP The P.A Module consists of 2-stage amplifier (Q9,8) and amplifies the TX signal from +16dBm to +30dBm.
  • Page 23 Service Manual SP - 1402 UHF Receive The receiver is comprised of: Front End Filter / RF amplifier First mixer and first IF amplifier Second mixer, second IF amplifier and FM detector (AN29160AA) Mute (Squelch) circuit (AN29160AA) Speaker audio amplifier (AN29160AA) Front End Filter / RF amplifier The receive signal by the antenna is routed through the low pass filter, then onward to the antenna switching circuit consists of L5,D5 The front RF amplifier transistor Q15 consists of the...
  • Page 24 Service Manual SP - 1402 Second mixer, second IF amplifier and FM detector The output of the first filter amplifier, Q34, is coupled, via C122 to the base of Q14. Q14 is the second mixer .The second local oscillator signal from Q18 is 44.645MHz fed to the emitters of Q14 and converted to 455KHz at the collector and then second IF amplified by Q16 from the output of the second mixer.
  • Page 25 Service Manual SP - 1402 PLL IC Dual Modules prescaler The PLL synthesizer of the signal loop PLL circuit with the reference of 12.80 MHz. The IC2 PLL IC includes all the function such as the reference oscillator, the driver, the phase detector, the lock detector, and the programmable divider.

  • Page 26: Troubleshooting

    Service Manual SP - 1402 Troubleshooting SYMPTOMS CAUSES COUNTER MEASURES 1. Complete discharge of battery 1. Replace battery. (7.5+/-10%) Unit does not Work 2. Replace fuse 2. Fuse blown up 3. IC5 (5v+/-0.2v) 3. 5v voltage source 1. PLL error 1.CheckTCXO/VCO/PLL IC 2.
  • Page 27 Service Manual SP - 1402 Diagnostic Function The diagnostic function is designed to inform the user about the operational status of the radio. The possible audible and visual warnings are: LCD display LED colour Audio tone Power on Melody Busy Orange Correct call Green...

  • Page 28: Schematics And Pcb Layout Index

    Service Manual SP - 1402 Schematics and PCB layout Index This section contains PCB layouts, block diagrams pertaining to the SP-1402 Series Radio. Associated main schematics may be found in the wallet at the rear of this binder. Order of...
  • Page 29 Service Manual SP - 1402 Schematics and PCB layout Index Page 29 of 35...
  • Page 30 Service Manual SP - 1402 Schematics and PCB layout Index Page 30 of 35...
  • Page 31 Service Manual SP - 1402 Schematics and PCB layout Index Page 31 of 35...
  • Page 32 Service Manual SP - 1402 Schematics and PCB layout Index Page 32 of 35...

  • Page 33: Parts List & Exploded View

    Service Manual SP - 1402 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 Mechanical Exploded View Page 33 of 35...
  • Page 34 Service Manual SP - 1402 Parts List Page 34 of 35...

  • Page 35: Contact Details

    Service Manual SP - 1402 Contact details Should you have any queries regarding this manual, or the information within it, please contact: Tecnet International Inc. 11535 W 83 Terrace Lenexa,KS 66214 Tel: (913)859-9515 Fax: (913)859-9550 www.tecnetusa.com Page 35 of 35...

This manual is also suitable for:

Sp-1102

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