Sharp R-880B Manuale Utente

SERVICEMANUALMULTI CHANNEL AM/FM TRANSCEIVERTCB-880TTI Tech

4. Description of Frequency Determining and Stabilizing Circuit 4-1. Introduction The Frequencies for transmitter and receiver first local frequ

Transmit --- --- --- Transmit CH 1 , 13.4825 MHz CH 40 , 13.7025 MHz 26.965 MHz 27.405 MHz Since all frequencies are obtained from the cryst

Program Data & Frequency[Table 1] RX TX Channel Frequency [MHz] N Fvco N Fvco 1 26.965 3254 16.27 5393 13.4825 2 26.975 3256 16.28 5395 13.4875 3

4-3. Descriptions of Each Block 4-3-1. Introduction The synthesizer is implemented with the following components; PLL IC (IC301)

4-3-7. Transmitter Doublers The output signal of Q302, L302 goes to an amplifier with tuning circuit Q701, L701, L702 which doubles incoming 13M

4-5. Description of other Circuits 4-5-1. Transmitter A. RF Amplification RF carrier frequencies are obtained at the output of doublers amplifi

4-5-2. Receiver Overload protection is provided to receiver’s semiconductors by diode D101. These diodes have a little effect on the incoming signa

5. Test Equipment Setup and Alignment Instructions 5-1 General Section 5-1-1 Test Equipment Required • DC power supply(13.8V/3A) • DC Vo

5-2 Transmitter Section 5-2-1 Test Equipment Required • RF Power Meter • DC power supply(13.8V/3A) • 50 ohms load (non-inductive) • Spectrum

4 FM Deviation Adj. Channel & Frequency : 19CH, 27.185MHz MIC : Transmit Function : FM Mode CB/ANL Off/DX Volume : Optional Squelch : Optional R

SECTION 1 SPECIFICATIONSSECTION 2 CIRCUIT DESCRIPTION1 GENERAL2 TECHNICAL DESCRIPTION3 SEMICONDUCTORS AND FUNCTION4 DESCRIPTION OF FREQUENCY DETERMINI

5-3 Receiver Section 5-3-1 Test Equipment Required • Standard Signal Generator(SSG) • DC power supply(13.8V/3A) • AC Level Meter • Distorti

4 RX Signal Meter Adj. Channel & Frequency : 19CH, 27.185MHz MIC : Receive Function : FM Mode CB/ANL Off/DX SSG : 27.185MHz, 1KHz, 100uV, 1.5KH

NAME & DESCRIPTION VENDOE CODEQ'tyLocation NOITEM MAKER VENDOR ASS'Y TCB TCB REMARKS880 880B* ELECT PartsCOVER ASS'Y1 SPEAKER 77AR

37 LCD DISPLAY SDMA2295B FOR TCB-880 SANTECH MAN 1 1 LCD80138 SW TACT SKTS-1102A SEKWANG SEKWANG MAN 8 8SW801, SW802, SW803, SW804, SW805,SW806, SW807

73 CHIP RESISTOR 470 1/16W 5% T 1608 PHILIPS SMD 6 6 R101, R105, R106, R165, R236, R93174 CHIP RESISTOR 4.7K 1/16W 5% T 1608 PHILIPS SMD 7 7R138, R223

109 CHIP CERAMIC 6PF 1608 PHILIPS/SAMSUNG SMD 2 2 C317, C321110 CHIP CERAMIC 68PF 1608 PHILIPS/SAMSUNG SMD 3 3 C97,C131, C732111 CHIP CERAMIC 680PF 16

149 ELECT CAPACITOR 0.22UF KR1-16VR22MA 5X11 DONGXIANG MAN 1 1 C124150 ELECT CAPACITOR 2.2UF KR1-16V2R2MA 5X11 DONGXIANG MAN 1 1 C741151 ELECT CAPACIT

0.g3 VOL KNOB ABS (SILVER SPRAY) Bonso 2 For Vol & ChVOL KNOB ABS (BLACK COLOR) 24 SQ KNOB ABS (SILVER SPRAY) Bonso 4 For Sq, Rf, Mic gi

* ACCESSORY1 MIC ASS'Y Hankyung 1 12 BRACKET SET ECO 050103-01 Hankyung 1 13STUD BOLT ABS, M6*8L, BLACKHankyung224BRACKET(MIC) SUS304, 1.0t

SECTION4 MECHANICAL DISASSEMBLY39135454x6x3x3x410751144164854295655579x48x4619181751262750285314355220212322202363121x2203038x3x2x2x3x34349374142x

SECTION1 SPECIFICATIONSChannelFrequency RangeOperating modeFrequency ControlFrequency ToleranceOperating Temperature RangeMicrophoneInput VoltageS

Upper coverBottom coverBracket (Set)EscutcheonVol knobSp knobilluminator (vol)illuminator (sq)Ring nutNut for Mic connectorWasher for Mic connectorKey

5-1 Main PCB (Top side)SECTION5 BOARD LAYOUT

Main PCB (Bottom side)

5-2 Front PCB (Top side)

Front PCB (Bottom side)

5-3 LED PCB (Top side)

LED PCB (Bottom side)

5-4 Volume PCB

5-5 MIC PCB

SECTION6 BLOCK DIAGRAM

------------ Contents ------------- 1 General 1-1. Receiver 1.2. Transmitter 2. Technical Description 2-1. General

SECTION7 SCHEMATIC

1. General 1-1. Receiver ① Display : 40 Channels and other functions indication ② Frequency Range : 26.965 to 27.405 [MHz] ③ Frequency Resp

2. Technical Description 2-1. General Model CB-880 is an mobile type AM/FM radio transceiver for use of the Citizen Radio Service. z Front Pan

2-3. Frequency Table Channel Frequency (MHz) Channel Frequency (MHz) 1 26.965 21 27.215 2 26.975 22 27.225 3 26.985 23 27.235 4 27.005 24 27.245 5 27

3. Semiconductors and Function 3-1. Transistor -----------------------------------------------------------------------------------------------------

Q941 KRC111S KEC Mute Q942 KRC112S KEC TX B+ Mute at TX Mode Q951 KTA1241 KEC Back Light LED Control Q952 KTA1241 KEC Back Light LED