Maxon Telecom SM-2000 service manual Digital Section

Page 40

MAXON SM-2000 MOBILE

650-000-0001 SM-2150/VHF MAIN BOARD

DIGITAL SECTION (continued)

Digital Parts Common on Both VHF & UHF

REF #	DESCRIPTION		PART #		REF #	DESCRIPTION		PART #
Q550	TRANSISTOR		202-113-1		R447	CHIP RESISTOR	120K	060-124-6Z
Q551	TRANSISTOR		202-113-1		R448	CHIP RESISTOR	220K	060-224-4Z
Q552	TRANSISTOR		202-113-1		R449	CHIP RESISTOR	820	060-821-3Z
Q553	TRANSISTOR		202-113-1		R450	CHIP RESISTOR	22K	060-223-3Z
R186	CHIP RESISTOR	47K	060-473-2Z		R451	CHIP RESISTOR	2.2K	060-222-2Z
R401	CHIP RESISTOR	680K	060-684-6Z		R452	CHIP RESISTOR	1M	060-105-0Z
R402	CHIP RESISTOR	47K	060-473-2Z		R453	CHIP RESISTOR	3K	060-302-1Z
R403	CHIP RESISTOR	10K	060-103-8Z		R454	CHIP RESISTOR	4.7K	060-472-1Z
R404	CHIP RESISTOR	56K	060-563-0Z		R455	CHIP RESISTOR	3.6K	060-362-5Z
R405	CHIP RESISTOR	7.5K	060-752-4Z		R456	CHIP RESISTOR	27K	060-273-8Z
R406	CHIP RESISTOR	18K	060-183-0Z		R457	CHIP RESISTOR	47K	060-473-2Z
R407	CHIP RESISTOR	330K	060-334-0Z		R458	CHIP RESISTOR	47K	060-473-2Z
R408	CHIP RESISTOR	3.3K	060-332-8Z		R459	CHIP RESISTOR	2.4K	060-242-0
R410	CHIP RESISTOR	220K	060-224-4Z		R460	CHIP RESISTOR	470	060-471-0Z
R411	CHIP RESISTOR	100K	060-104-9Z		R461	CHIP RESISTOR	470	060-471-0Z
R412	CHIP RESISTOR	39K	060-393-3Z		R462	CHIP RESISTOR	47K	060-473-2Z
R414	CHIP RESISTOR	8.2K	060-822-4Z		R463	CHIP RESISTOR	47K	060-473-2Z
R415	CHIP RESISTOR	8.2K	060-822-4Z		R464	CHIP RESISTOR	47K	060-473-2Z
R416	CHIP RESISTOR	220K	060-224-4Z		R465	CHIP RESISTOR	47K	060-473-2Z
R417	CHIP RESISTOR	8.2K	060-822-4Z		R466	CHIP RESISTOR	100K	060-104-9Z
R418	CHIP RESISTOR	8.2K	060-822-4Z		R469	CHIP RESISTOR	10K	060-103-8Z
R419	CHIP RESISTOR	47K	060-473-2Z		R470	CHIP RESISTOR	30K	060-303-2Z
R420	CHIP RESISTOR	10K	060-103-8Z		R471	CHIP RESISTOR	36K	060-363-6Z
R421	CHIP RESISTOR	10K	060-103-8Z		R472	CHIP RESISTOR	30K	060-303-2Z
R422	CHIP RESISTOR	43K	060-433-6Z		R473	CHIP RESISTOR	4.7K	060-472-1Z
R423	CHIP RESISTOR	47K	060-473-2Z		R474	CHIP RESISTOR	360K	060-364-7
R424	CHIP RESISTOR	560	060-561-8Z		R490	CHIP RESISTOR	47K	060-473-2Z
R425	CHIP RESISTOR	10K	060-103-8Z		R550	CHIP RESISTOR	7.5K	060-752-4Z
R426	CHIP RESISTOR	47K	060-473-2Z		R551	CHIP RESISTOR	27K	060-273-8Z
R427	CHIP RESISTOR	39K	060-393-3Z		R552	CHIP RESISTOR	27K	060-273-8Z
R428	CHIP RESISTOR	20K	060-203-5Z		R553	CHIP RESISTOR	7.5K	060-752-4Z
R429	CHIP RESISTOR	100K	060-104-9Z		R554	CHIP RESISTOR	2.2K	060-222-2Z
R430	CHIP RESISTOR	10K	060-103-8Z		R555	CHIP RESISTOR	4.7K	060-472-1Z
R431	CHIP RESISTOR	22K	060-223-3Z		R556	CHIP RESISTOR	2.2K	060-222-2Z
R433	CHIP RESISTOR	47K	060-473-2Z		R559	CHIP RESISTOR	470	060-471-0Z
R434	CHIP RESISTOR	47K	060-473-2Z		RLK3	CHIP RESISTOR	0	060-000-8Z
R435	CHIP RESISTOR	47K	060-473-2Z		RLK4	CHIP RESISTOR	0	060-000-8Z
R436	CHIP RESISTOR	22K	060-223-3Z		RLK5	CHIP RESISTOR	0	060-000-8Z
R437	CHIP RESISTOR	4.7K	060-472-1Z		RLK7	CHIP RESISTOR	0	060-000-8Z
R438	CHIP RESISTOR	4.7K	060-472-1Z		RLK8	CHIP RESISTOR	0	060-000-8Z
R439	CHIP RESISTOR	47K	060-473-2Z		RLK10	CHIP RESISTOR	0	060-000-8Z
R440	CHIP RESISTOR	1M	060-105-0Z		RLK11	CHIP RESISTOR	0	060-000-8Z
R441	CHIP RESISTOR	43K	060-433-6Z		RLK12	CHIP RESISTOR	0	060-000-8Z
R442	CHIP RESISTOR	33K	060-333-9Z		RLK13	CHIP RESISTOR	0	060-000-8Z
R443	CHIP RESISTOR	20K	060-203-5Z		RLK14	CHIP RESISTOR	0	060-000-8Z
R444	CHIP RESISTOR	220K	060-224-4Z		RV402	RES.CHIP SEMIFIXED 22K		067-223-8Y
R445	CHIP RESISTOR	120K	060-124-6Z		RV403	RES.CHIP SEMIFIXED 47K		067-473-7Y
R446	CHIP RESISTOR	82K	060-823-5Z		X401	CRYSTAL		262-228-0Z

Page-36-

December 98

Image 40

Contents SM-2000 Page Table of Contents Maxon SM-2000 MobilePCB Layouts Schematics and Block DiagramsSM-2000 Exploded View Transceiver Nominal Performance SpecificationsGeneral Band Operational BandwidthTransmitter Specfications SUB Audible Tones DCS TX Tone Modulation CharacteristicsReceiver RX Tone Demodulation Characteristics AccessoriesSubaudible tones CTCSS/DCS Reliability AnalysisIntroduction Unpacking Information Check the carton carefully for the following itemsGeneral Description Description of Controls Description of ControlsSM-2000 Rear Panel Theory of Operation Digital CircuitryCTCSS/DCS Decode Circuits CTCSS/DCS Encoder CircuitEeprom PLL RF Section SM-2150/VHF RX VCO TX VCOOut of Lock Detector PrescalerReceiver RF AmplifierReceiver Audio Circuit Low Pass FilterAudio 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 Mute Circuit Squelch Noise Band Pass FilterNoise Detector Speaker Audio AmplifierTest Setup Transmit TestsSM-2150/VHF Alignment Procedure PLL AlignmentDiscriminator Tuning Receiver Alignment RFSquelch Adjustment Automatic Power AdjustmentCTCSS/DCS Deviation Adjustment Modulation 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 Mount Component Replacement Surface Mounted Integrated Circuit ReplacementParts List Common to SM-2000 REF # DescriptionDigital Parts Common on Both VHF & UHF Digital Section Band Chart REF # Description FRONT-END PCB Assembly Main Board PartsPage-38 December Page-39 December Page-40 December Page-41 December SM-2450A UHF Band SM-2450C UHF Band SM-2450D UHF Band Band Chart SM-2450E UHF BandPage-44 December Page-45 December Page-46 December Page-47 December Component Pinout Page-49 December Page-50 December Voltage Charts SM-2150/VHF IC409Page-52 December Transistor Voltage Chart Voltage Charts SM-2450/UHF IC404 Page-56 December Trouble Shooting Chart SM-2000 Status Indications & Audible TonesPage-58 December Replacement Module Schematics MMBV109MA-4472 Microphone Schematic Page-61- December Page-62- December Page-63- December Page-64- December SW5 SM-2000 Control HeadSM-2150/VHF Main Board Assy Page-66 DecemberSM-2450/UHF Main Board Assy FrontSM-2000 SM-2150/VHF Exploded View Parts List Intentionally Left Blank