sony_icf-r40_service_manual 电路图 维修原理图.pdf
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1、MICROFILM SERVICE MANUAL FM/AM RADIO Tourist Model SPECIFICATIONS ICF-R40 Ver 1.0 1999. 03 RadioFans.CN 2 HOW TO CHANGED THE CERAMIC FILTERS This model is used two ceramic filters of CF2 and CF3. You must used same type of color marked ceramic filters in order to meet same specifications. Therefore,
2、 the ceramic filter must changed two pieces together since its supply two pieces in one package as a spare parts. CF2 CF3 mark MarkCenter frequency red10.70 MHz blue10.67 MHz orange10.73 MHz black10.64 MHz white10.76 MHz Notes on chip component replacement Never reuse a disconnected chip component.
3、Notice that the minus side of a tantalum capacitor may be dam- aged by heat. SECTION 1 GENERAL This section is extracted from instruction manual. RadioFans.CN 3 CABINET (REAR) MAIN BOARD Note: Follow the disassembly procedure in the numerical order given. SECTION 2 DISASSEMBLY 1Pull out the ear rece
4、iver. 9claw 3two screws (DIA. 1.4 4) 4screw (M1.7 10) 9claw 8claw S1 6claw 7claw 6claw C 7claw 2Open the “lid, battery case” in the direction of arrows A to B. 5First, insert the flat-blade screwdriver into the cabinet and turn it in the direction of the arrow C to release two claws 6. Next, release
5、 all claws from 7 to 0 in numerical order. Note: Hold a cloth to the cabinet not to be damaged. !Remove two solders of reel assy. 8claw knob (earphone/spaeker) !claw A B !cabinet (rear) Note: On installation of cabinet (rear), adjust the knob (earphone/speaker) and S1. 3knob (2 band) 2knob (noise cu
6、t) 1knob (power) 4Remove two solders of speaker leads. 5MAIN board RadioFans.CN 4 REEL ASSY 4reel assy 2three screws (B1.4 3) 3Draw the ear receiver in the direction of the arrow. 1blind plate RadioFans.CN 5 SECTION 3 DIAL POINTER SETTING Note: Follow the assembly procedure in the numerical order gi
7、ven. A 4knob (tune) 1Insert the pointer in the groove of cabinet (front) assy and slide in the direction of the arrow A. 3gear (midway) cabinet (front) assy cabinet (front) assy the tip of pointer pointer marking 2Set the tip of pointer to the marking of cabinet (front) assy. 8Rotate the gear (tunin
8、g capacitor) fully in the direction of the arrow C. C B 9MAIN board Note: On installation of MAIN board, set the outline of gear (tuning capacitor). boss oval 6To install the gear fixing each oval shape, set the boss of the gear (tuning capacitor) as the figure. 7screw (1.7 3) 5Rotate the tuning cap
9、acitor shaft fully in the direction of the arrow B. cabinet (front) assy RadioFans.CN 6 FM Setting: POWER switch: AUTO OFF Band switch: FM Output select switch: (earphone) AM Setting: POWER switch: AUTO OFF Band switch: AM Output select switch: (earphone) Repeat the procedures in each adjustment sev
10、eral times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors. Adjustment Location: FM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter. L375 MHz CT1-3109.5 MHz FM TRACKING ADJUSTMENT Adjust for a maximum reading on level me
11、ter. L275 MHz CT1-4109.5 MHz AM IF ADJUSTMENT Adjust for a maximum reading on level meter. T1455 kHz AM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter. L4515 kHz CT1-11,650 kHz AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter. L1600 kHz CT1-21,400 kHz SEC
12、TION 4 ELECTRICAL ADJUSTMENTS FM RF signal generator 22.5 kHz frequency deviation by 400 Hz signal Output level: as low as possible + level meter (earphone) jack (J1) set TP (FM IN) 16 0.01 F AM RF signal generator 30% amplitude modulation by 400 Hz signal Output level: as low as possible Put the le
13、ad-wire antenna close to the set. + level meter set 16 (earphone) jack (J1) CT1-4 L2 FM Tracking Adjustment CT1-3 L3 CT1-2 L1 AM Frequency Coverage AdjustmentCT1-1 T1AM IF Adjustment L4AM Frequency Coverage Adjustment TP (FM IN) J1 (earphone) jack MAIN BOARD (Component Side) FM Frequency Coverage Ad
14、justment AM Tracking Adjustment 0 dB=1 V RadioFans.CN ICF-R40 7 8 SECTION 5 DIAGRAMS 13 10 1518 11 68 FM FRONT-END FM IF AMP AF POWER AMP AM IF AMP, AGC, DET AM FRONT-END 17 20 FM RF IN MIX OUT CF2 10.7MHz CF1 455kHz CF3 10.7MHz Q1 TONE CONTROL SWITCH FM RF FM IF 3 FM DISCRIMINATOR TUNING METER DISC
15、RI 28 AF OUT SP1 (SPEAKER) AF IN 24 16 25 DET AM IF METER VOL 5 BAND REG AM OSC L4 AM OSC L3 FM OSC L1 AM FERRITE-ROD ANTENNA FM OSC AM ANT L2 FM RF FM/AM FRONT-END, FM/AM IF AMP, DET, AGC, AF AMP IC1 TIMER IC2 CT1-2 + CT1-3, L3 FM FREQUENCY COVERAGE CT1-1, L4 AM FREQUENCY COVERAGE CT1-4, L2 FM TRAC
16、KING CT1-2, L1 AM TRACKING T1 AM IF SIGNAL PATH : FM : AM 05 9 DRY BATTERY SIZE “AAA” (IEC DESIGNATION R03) 2PCS. 3V FM/AM TUNER (IC1) B+ J1 (EARPHONE) EP1 (EARPHONE) B+ SWITCH Q3 BAND-PASS FILTER Q2 CR OSCILLATOR COUNTEROSC CHATTERING PROTECTOR CONTROL B+ OUT SET RESET D5 C33, R15 17 VDD OSC1 OSC3
17、8 7 6 5 1 3 ON OFF AUTO OFF S2 POWER D2 TUNE RV1 VOL CV1 TUNE CV1 TUNE AM FM S4 BAND S5 NOISE CUT ONOFF CT1-4 CT1-3 CV1-2 CV1-4 CT1-1 CV1-1 CV1-3 S1 / EARPHONESPEAKER 27 REG B+ (1.25V) VCC 5-1.BLOCK DIAGRAM RadioFans.CN ICF-R40 9 10 Semiconductor Location Ref. No.Location D1C-3 D2B-1 D5B-3 IC1F-2 IC
18、2B-3 Q1C-2 Q2C-2 Q3B-3 Note on Printed Wiring Board: X : parts extracted from the component side. Y : parts extracted from the conductor side. W: indicates side identified with part number. r: Through hole. : internal component. b : Pattern from the side which enables seeing. (The other layers patte
19、rns are not indicated.) Caution: Pattern face side:Parts on the pattern face side seen from (Conductor Side)the pattern face are indicated. Parts face side:Parts on the parts face side seen from (Component Side)the parts face are indicated. 5-2.PRINTED WIRING BOARD RadioFans.CN ICF-R40 11 12 Note on
20、 Schematic Diagram: All capacitors are in F unless otherwise noted. pF: F 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in and 1/4 W or less unless otherwise specified. : internal component. C : panel designation. U : B+ Line. H : adjustment for repair. Po
21、wer voltage is dc 3 V and fed with regulated dc power supply from battery terminal. Voltages are dc with respect to ground under no-signal (detuned) conditions. no mark : FM () : AM Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal produc- tion toler
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