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SECTION 4 MEMORY PROTECTION To prevent accidental changes, required memory channels 7) Push [ can be specified as protect channels.Produced by the T8V regulator (Q34, Q35, D32) Input port for tuning step selection and controlled by the T/R switching circuit. Description A voltage line from the external DC power Input port for the frequency exchange connector. 3-4 VOLTAGE LINES 3-5 CPU PORT ALLOCATIONS LINE DESCRIPTION Pin No.The amplified signals are used for a The PLL circuit steadily oscillates the transmit and receive receive/transmit LO signal as PLL output (OUT2) or used local frequencies while comparing the phase of the divided for a feedback signal (OUT1) to the PLL circuit. The signal generated at the VCO is buffer-amplified at 3-3-1 GENERAL (PLL UNIT) Q2001 or Q2002. 3-3 PLL CIRCUITS The VCO circuits (Q2004) employs a clap oscillator circuit.The mixed signal The mic amplifier circuit amplifies the mic audio with the is passed through the transmitter bandpass filter to re limiter circuit to a level needed for the AM modulator. 3-2 TRANSMITTER CIRCUITS The PLL output and the reference oscillator signals are amplified at Q29 and Q20 respectively and are then applied 3-2-1 MIC AMPLIFIER CIRCUIT (MAIN UNIT) to the transmitter mixer circuit (IC15).When no voice modulation is included in the signal, the squelch circuit cuts out the AF signal by The 2nd IF signal from Q10 is detected at the AM comparing voice audio and noise audio components in the. 3-1-5 AM DETECTOR CIRCUIT (MAIN UNIT) 3-1-7 SQUELCH CIRCUIT (MAIN UNIT) The AM detector circuit demodulates the 2nd IF signal to The squelch circuit cuts out AF signals when receiving no AF signals.SECTION 3 CIRCUIT DESCRIPTION 3-1 RECEIVER CIRCUITS 3-1-3 1st MIXER AND 1st IF CIRCUITS (MAIN UNIT) 3-1-1 ANTENNA SWITCHING CIRCUIT (PA UNIT) The 1st mixer circuit converts the received signals to a fixed The antenna switching circuit functions as a low-pass filter frequency of the 1st IF signal using a PLL output frequency.And please do not forget to like us on facbook or leave feedback.
#Icom ic v200 service manual manual
Icom IC-V 200 Service Manual covers following topics Icom IC-V 200 Service Manual.
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DO NOT transmit power into a signal generator or a sweep generator.ħ.
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DO NOT keep power ON for a long time when the transceiver is defective.Ħ. An insulated tuning tool MUST be used for all adjustments.ĥ. DO NOT short any circuits or electronic parts. DO NOT force any of the variable components.
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DO NOT open the transceiver until the transceiver isģ. Make sure a problem is internal before disassembling the transceiver.Ģ. This could damage theīe sure to include the following four points when orderingĪddresses are provided on the inside back cover for yourġ. This will ruin theĭO NOT expose the transceiver to rain, snow or any liquids.ĭO NOT reverse the polarities of the power supply whenĭO NOT apply an RF signal of more than 20 dBm (100 NEVER connect the transceiver to an AC outlet or to a DC Internal circuits are subject to change without notice or
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To upgrade quality, any electrical or mechanical parts and This service manual describes the latest service informationįor the IC-A24/E/IC-A6/E VHF AIR BAND TRANSCEIVER