Maxon Telecom service manual Status Indications & Audible Tones, Trouble Shooting Chart SM-2000

Page 61

MAXON SM-2000 MOBILE

TROUBLE SHOOTING CHART (SM-2000)

TROUBLE SHOOTING CHART (SM-2000)

Status Indications & Audible Tones

STATUS

DESCRIPTION

LED COLOR

AUDIBLE TONE

 

 

 

 

 

Power on ready

N/A

Melody

 

 

 

 

 

Busy

Yellow

N/A

 

 

 

 

 

Correct Tone

Green

N/A

NORMAL

 

 

 

Transmit

Red

N/A

 

 

 

 

 

 

Scan

Green, Flashing

N/A

 

 

 

 

 

Busy Lock

Yellow, Flashing

Single Tone

 

 

 

 

 

Time Out Timer

N/A

Single Tone

WARNING

 

 

 

Battery Low

Red, Flashing

Four Tone, Repeated

 

 

 

 

 

 

EEPROM Error

Red, Flashing

Single Tone Repeated

ERROR

PLL Error

Red, Flashing

Double Tone Repeated

 

Filtering Error

Red, Flashing

Three Tone Repeated

 

 

 

 

Unit Does Not Program

1.Defective Programming Lead

2.Wrong Programming Mode

3.Defective MIC Connector

4.Defective IC412

Unit Does Not Work

1.Open DC fuse in Power Cable

2.Defective Volume Switch

3.Defective Regulator IC107, 105, 402

4.Broken DC Cable

No Output from Speaker

1.Defective internal speaker and external jack

2.Defective IC108

3.Defective VR801

Squelch Does Not Work

1.Wrong alignment of squelch resistor RV103

2.Defective IC109

3.Defective CPU IC409

No Sub Audio Decode

CTCSS/DCS

1.Wrong Programming

2.Defective Switch Filter IC406 (MF-6)

3.Defective CPU IC409

Page-57-

December 98

Image 61
Contents SM-2000 Page Maxon SM-2000 Mobile Table of ContentsPCB Layouts Schematics and Block DiagramsSM-2000 Exploded View Transceiver Nominal Performance SpecificationsGeneral Band Operational BandwidthTransmitter Specfications SUB Audible Tones DCS TX Tone Modulation CharacteristicsReceiver Accessories RX Tone Demodulation CharacteristicsSubaudible tones CTCSS/DCS Reliability AnalysisIntroduction Check the carton carefully for the following items Unpacking InformationGeneral Description Description of Controls Description of ControlsSM-2000 Rear Panel Digital Circuitry Theory of OperationCTCSS/DCS Decode Circuits CTCSS/DCS Encoder CircuitEeprom PLL RF Section SM-2150/VHF TX VCO RX VCOPrescaler Out of Lock DetectorReceiver RF AmplifierLow Pass Filter Receiver Audio CircuitAudio Amplifier Noise Detect Circuit SQ BoardUHF Transmitter RF Section SM-2450/UHFFrequency Synthesizer Circuit First Mixer Voltage Controlled Oscillator CircuitSecond Oscillator- Mixer- Limiter and FM Detector Squelch Noise Band Pass Filter Squelch Mute CircuitNoise Detector Speaker Audio AmplifierTransmit Tests Test SetupPLL Alignment SM-2150/VHF Alignment ProcedureReceiver Alignment RF Discriminator TuningAutomatic Power Adjustment Squelch AdjustmentModulation Deviation Adjustment CTCSS/DCS Deviation AdjustmentAlignment Points Diagram SM-2150/VHF SM-2450/UHF Alignment Procedure Page-28 December ∙ Note Release the PTT button when changing channels Page-30 December Alignment Points Diagram SM-2450/UHF Surface Mount Components Component ReplacementSurface Mount Removal Surface Mounted Integrated Circuit Replacement Surface Mount Component ReplacementREF # Description Parts List Common to SM-2000Digital Parts Common on Both VHF & UHF Digital Section REF # Description FRONT-END PCB Assembly Main Board Parts Band ChartPage-38 December Page-39 December Page-40 December Page-41 December SM-2450A UHF Band SM-2450C UHF Band SM-2450D UHF Band SM-2450E UHF Band Band ChartPage-44 December Page-45 December Page-46 December Page-47 December Component Pinout Page-49 December Page-50 December IC409 Voltage Charts SM-2150/VHFPage-52 December Transistor Voltage Chart Voltage Charts SM-2450/UHF IC404 Page-56 December Status Indications & Audible Tones Trouble Shooting Chart SM-2000Page-58 December MMBV109 Replacement Module SchematicsMA-4472 Microphone Schematic Page-61- December Page-62- December Page-63- December Page-64- December SM-2000 Control Head SW5Page-66 December SM-2150/VHF Main Board AssyFront SM-2450/UHF Main Board AssySM-2000 SM-2150/VHF Exploded View Parts List Intentionally Left Blank