Sharp ATR-924 Service Manual

Bl ServiceManualMODELATR-924SnrnnnnnnLdaSPECIFICATIONS GENERAL DESCRIPTIONFrequency Range: AM: 530—1605kHz The circuitry used in this car radio incorporates 11FM: 87—108MHz transistors, 7 diodes and 1 thermistor.Intermediate Frequency: AM: 455kHz FM: 10.7MHz A external antenna feeds the AM broadcasting signal toPower Supply: 12V/6V (+) or (—) grounding the AM RF amplifier and converter.Power Output: SW/2.5W After going through 2 IF amplifiers and 1 diode detector,Speaker: 6-1/4” Permanent Dynamic the signal passes through a 4 transistor audio amplifier circuit.Speaker with speaker box A external antenna feeds the FM broadcasting signal toDimensions: 2”°(H) X 5”(D) X6-1/4"(W) the FM RF amplifier and mixer.Weight: 4.0 Ibs. After going through 3 IF amplifier and 2 diodes detector,the signal passes through a 4 transistor audio amplifier circuit.Transistor Complement: An AVC voltage is fed back to RF amplifier and IFTR. 1 2SA440 FM RF Amplifier amplifier.TR. 2 2SA235 FM MixerTR. 3 2SA235 FM OscillatorTR. 4 2SA355 AMRF Amplifier | éTR. 5 2SA234 AM Converter CHASSIS REMOVALFM Ist IF Amplifier 1. Remove 3 cover retaining screws.Te OZone a ee saeco 2. Remove the cover.TR. 7 2SA234 noes dIF eee 3. Remove 4 screws located on the printed circuit board.4. Re th tFM 3rd IF Amplifier move the output transformer leads, and tuner lead.TR. 8 2SB75 AF AmplifierTR. 9 2SB75 DriverTR.10, 11 2SB368 OutputSHARP CORPORATION osaxka, saran