Alignment Points Diagram SM-2450/UHF | Maxon Telecom SM-2000

MAXON SM-2000 MOBILE

ALIGNMENT POINTS DIAGRAM (SM-2450/UHF)

ALIGNMENT POINTS DIAGRAM (SM-2450/UHF)

TX HI PWR	RV103
RV104	RV103
T103	SQUELCH 12.5 kHz CH/SP
DISCRIMINATOR
RV105
TX LO PWR	SQUELCH 25 kHz CH/SP
	SQUELCH 25 kHz CH/SP

T101

T102

RV102

TC101

TP1	CNTR FREQ	RV101
	TC701	RV101
		CTCSS

DCS

RV403

RV402

TX DEVIATION

J1

Page-31-

December 98

Image 35

Maxon Telecom SM-2000 service manual Alignment Points Diagram SM-2450/UHF

Contents

SM-2000 Page Maxon SM-2000 Mobile Table of Contents SM-2000 Exploded View Schematics and Block DiagramsPCB Layouts General SpecificationsTransceiver Nominal Performance Transmitter Operational BandwidthBand Specfications Receiver TX Tone Modulation CharacteristicsSUB Audible Tones DCS Reliability Analysis RX Tone Demodulation CharacteristicsAccessories Subaudible tones CTCSS/DCS Introduction Check the carton carefully for the following items Unpacking Information General Description Description of Controls Description of Controls SM-2000 Rear Panel CTCSS/DCS Encoder Circuit Theory of OperationDigital Circuitry CTCSS/DCS Decode Circuits Eeprom PLL RF Section SM-2150/VHF TX VCO RX VCO RF Amplifier Out of Lock DetectorPrescaler Receiver Noise Detect Circuit SQ Board Receiver Audio CircuitLow Pass Filter Audio Amplifier Frequency Synthesizer Circuit RF Section SM-2450/UHFUHF Transmitter Second Oscillator- Mixer- Limiter and FM Detector Voltage Controlled Oscillator CircuitFirst Mixer Speaker Audio Amplifier Squelch Mute CircuitSquelch Noise Band Pass Filter Noise Detector Transmit Tests Test Setup PLL Alignment SM-2150/VHF Alignment Procedure Receiver Alignment RF Discriminator Tuning Automatic Power Adjustment Squelch Adjustment Modulation Deviation Adjustment CTCSS/DCS Deviation Adjustment Alignment 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 Removal Component ReplacementSurface Mount Components Surface Mounted Integrated Circuit Replacement Surface Mount Component Replacement REF # Description Parts List Common to SM-2000 Digital Parts Common on Both VHF & UHF Digital Section REF # Description FRONT-END PCB Assembly Main Board Parts Band Chart Page-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 Chart Page-44 December Page-45 December Page-46 December Page-47 December Component Pinout Page-49 December Page-50 December IC409 Voltage Charts SM-2150/VHF Page-52 December Transistor Voltage Chart Voltage Charts SM-2450/UHF IC404 Page-56 December Status Indications & Audible Tones Trouble Shooting Chart SM-2000 Page-58 December MMBV109 Replacement Module Schematics MA-4472 Microphone Schematic Page-61- December Page-62- December Page-63- December Page-64- December SM-2000 Control Head SW5 Page-66 December SM-2150/VHF Main Board Assy Front SM-2450/UHF Main Board Assy SM-2000 SM-2150/VHF Exploded View Parts List Intentionally Left Blank