Sony-TC-KE340-Service-Manual电路原理图.pdf

SERVICE MANUAL STEREO CASSETTE DECK AEP Model TC-KE240/RE340 UK Model TC-KE240 E Model Australian Model TC-RE340 SPECIFICATIONS TC-KE240/RE340 Photo: TC-RE340 (Black type) Dolby noise reduction and HX Pro headroom ex- tension manufactured under license from Dolby Laboratories Licensing Corporation. HX Pro originated by Bang , and “HX PRO” are trademarks of Dolby Laboratories Licensing Cor- poration. Model Name Using Similar MechanismNEW Tape Transport Mechanism Type KE240TCM-230ASV1 RE340TCM-230ASR4N Continued on next page System Recording system 4 track 2 channel stereo Fast-winding time (approx.) 100 sec. (with Sony C 60 cassette) Bias AC bias Signal-to-noise ratio (at peak level and weighted with Dolby NR off) Type I tape, Sony Type I (NORMAL): 55 dB Type II tape, Sony Type II (HIGH): 57 dB Type IV tape, Sony Type IV (METAL): 58 dB S/N ratio improvement (approximate values) With Dolby B NR on: 5 dB at 1 kHz, 10 dB at 5 kHz With Dolby C NR on: 15 dB at 500 Hz, 20 dB at 1 kHz Harmonic distortion 0.4% (with Type I tape, Sony Type I (NORMAL): 160 nWb/m 315 Hz, 3rd H.D.) 1.8% (with Type IV tape, Sony Type IV (METAL): 250 nWb/m 315 Hz, 3rd H.D.) Type I tape, Sony Type I (NORMAL) 30 15,000 Hz (3 dB, IEC), 20 16,000 Hz (6 dB) Type II tape, Sony Type II (HIGH) 30 16,000 Hz (3 dB, IEC), 20 17,000 Hz (6 dB) Type IV tape, Sony Type IV (METAL) 30 18,000 Hz (3 dB, IEC), 20 19,000 Hz (6 dB), 30 13,000 Hz (3 dB, 4 dB recording) Frequency response (Dolby NR off) Tape type Inputs Line inputs (phono jacks) Sensitivity: 0.16 V Input impedance: 47 kilohms RadioFans.CN 收音机爱 好者资料库 2 SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY. Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be dam- aged by heat. Outputs Line outputs (phono jacks) Rated output level: 0.5 V at a load impedance of 47 kilohms Load impedance: Over 10 kilohms Headphones (stereo phone jack) Output level: 0.25 mW at a load impedance of 32 ohms General Power requirements Europe and certain countries in Asia: 220 230 V AC, 50/ 60 Hz Australia: 240 V AC, 50/60 Hz Other countries: 110 120/220 240 V AC, 50/60 Hz Power consumption TC RE340: 15 W TC KE240: 14 W Dimensions (approx.) (w/h/d) 430 120 290 mm Mass (approx.) 3.3 kg Supplied accessories Audio connecting cords (2) Design and specifications are subject to change without notice. RadioFans.CN 收音机爱 好者资料库 3 SECTION 1 SERVICING NOTE TABLE OF CONTENTS 1.SERVICING NOTE.3 2.GENERAL.4 3.DISASSEMBLY.5 4.MECHANICAL ADJUSTMENTS. 10 5.SERVICE MODE. 11 6.ELECTRICAL ADJUSTMENTS. 12 7.DIAGRAMS 7-1.Note for Printed Wiring Boards and Schematic Diagrams . 15 7-2.Printed Wiring Boards HEAD RELAY (REC/PB)/ LEAF SW (REC/PB) Boards . 18 7-3.Printed Wiring Board MAIN Board . 19 7-4.Schematic Diagram MAIN Section (1/2) . 20 7-5.Schematic Diagram MAIN Section (2/2) . 21 7-6.Printed Wiring Boards TRANS/POWER SW Boards . 22 7-7.Schematic Diagram TRANS/POWER SW Boards . 23 7-8.Printed Wiring Board DISPLAY Board . 24 7-9.Schematic Diagram DISPLAY Board . 25 7-10. Printed Wiring Boards KEY/HP Boards . 26 7-11. Schematic Diagram KEY Board . 26 7-12. IC Pin Function Description . 28 8.EXPLODED VIEWS. 30 9.ELECTRICAL PARTS LIST. 33 MODEL IDENTIFICATION BACK PANEL Part No. ModelPart No. TC-KE240 AEP model3-042-502-0s UK model3-042-502-1s AEP model3-042-490-0s TC-RE340Australian model3-042-490-1s Singapore model3-042-490-2s 4 SECTION 2 GENERAL 1 qaqdqfqgqkw;qjqlwawdqhwsqs 234806579 O M X IER DOLBY NRBALANCEAU O CA REC LEVEL 0 3 4 5 8 9 0 C BB PHONES L R AU O REC MU INGRECAUSE RESETMEMORY POWER DIRECT ON MODE EJECT S NCHRO FADERARL AMS 1Fluorescent indicator tube 2Cassette holder 3m button 4SYNCHRO button and indicator 5H button (TC-KE240) h, H buttons (TC-KE340) 6FADER button 7ARL button 8M button 9AUTO REC LEVEL indicator 0RED LEVEL knob qaPOWER button qsDIRECTION MODE button qdRESET button qfMEMORY button qgEJECT button qhx button qjAUTO CAL button (TC-RE340) qkX button qlDOLBY NR knob w;W button waBALANCE knob wsz button wdPHONES jack LOCATION OF CONTROLS Front Panel 5 1wire (flat type) (CN302) 1wire (flat type) (CN801) 6claw 6claw 7front panel section 5three screws (BVTP3 8) 5screw (BVTT3 6) 3screw (BVTT3 6) 4harness 2connector (CN802) 2connector (CN702) 2two connectors (CN301, CN803) CASE (410726) FRONT PANEL SECTION Note: Follow the disassembly procedure in the numerical order given. SECTION 3 DISASSEMBLY 1two screws (case 3 TP 2) 3case (410726) 2screw (BVTT3 6) 1two screws (case 3 TP 2) 6 MECHANISM DECK (TCM-230ASV1: KE240) (TCM-230ASR4N: RE340) MAIN BOARD 3four screws (BVTP2.6 8) 2lid (cassette) assy 1Push the button (eject). 4mechanism deck (TCM-230ASV1: KE240) (TCM-230ASR4N: RE340) 4screw (BVTP3 8) 2screw (BVTP3 8) 1connector (CN701) 5main board 3bracket (TR) 7 CASSETTE HOLDER (L) ASSY CAPSTAN MOTOR ASSY, LEAF SW BOARD 5screw (BVTT2 4) 3screw (BVTT2 4) 9two screws (BVTT2 5) 6fulcrum plate (R) 8cassette holder (L) assy 4fulcrum plate (L) 7loading spring (L) 2lever (LOCK L) 1step screw q;damper 4screw (PS2.6 6) 1two solders6leaf SW board 7belt (capstan) 5two claws 5claw 3capstan motor assy (M1002) 4screw (PS2.6 6) 2two screws (PS2.6 6) 8 PINCH LEVER ASSY FLYWHEEL ASSY 1claw 2pinch lever (FWD) assy 4pinch lever (REV) assy 3claw RE340 3flywheel (FWD) assy 6flywheel (REV) assy 7washer 4washer 2stopper washer 5stopper washer 1belt (FR2) RE340 RE340 9 MECHANICAL BLOCK ASSY (AMS) HEAD BASE ASSY (KE240), HEAD DECK ASSY (RE340), HEAD RELAY BOARD 2two screws (BVTT2 3.5) 2two screws (BVTT2 3.5) 3mechanical block assy (AMS) 4reverse slider 1torsion spring RE340 1screw (BVTT2 4) 2head relay (REC/PB) board 4head base assy (KE240), head deck assy (RE340) 3tension spring (HEAD) 10 SECTION 4 MECHANICAL ADJUSTMENTS 1.Clean the following parts with a denatured-alcohol-moistened swab: record/playback/erase headpinch roller rubber beltcapstan idler 2.Demagnetize the playback head with a head demagnetizer. 3.Do not use a magnetized screwdriver for the adjustments. 4.After the adjustments, apply suitable locking compound to the parts adjusted. 5.The adjustments should be performed with the power supply voltage unless otherwise noted. Torque Measurement ModeTorque MeterMeter Reading 2.74 6.86 mNm ForwardCQ-102C(28 69 gcm) (0.42 0.90 ozinch) Forward 0.1 0.59 mNm CQ-102C(1.1 6.0 gcm) Back Tension (0.01 0.06 ozinch) 2.74 6.86 mNm ReverseCQ-102RC(30 69 gcm) (0.42 0.90 ozinch) Reverse 0.1 0.59 mNm CQ-102RC(1.1 6.0 gcm) Back Tension (0.01 0.06 ozinch) 6.86 15.68 mNm FF, REWCQ-201B(70 159 gcm) (0.83 2.78 ozinch) 11 SECTION 5 SERVICE MODE Key Check figure 1 dB 201040+2+4+6+830 L R I ; figure 2 dB 201040+2+4+6+830 L R ; figure 3 TAPE TYPE dB 201040+2+4+6+830 L R PLAY REC DOLBY NR M AUTO CAL IIIIVBC88 88 ; figure 4 dB 201040+2+4+6+830 L R 0 ; figure 5 number indication 12 SECTION 6 ELECTRICAL ADJUSTMENTS Note: The adjustments should be performed in the order given in the ser- vice manual. As a rule, adjustments about playback should be per- formed before those about recording. The adjustments should be performed for both L-CH and R-CH. Switches and controls should be set as follows unless otherwise specified. DOLBY NR, MPX FILTER switch: OFF DIRECTION MODE switch: g Standard Record: Deliver the standard input signal level to the input jack and set the REC LEVEL volume to obtain the standard output signal level as follows. Record Mode Standard Input Level input terminalLINE IN source impedance10 k input signal level0.5 V (3.8 dB) Standard Output Level output terminalLINE OUT load impedance47 k output signal level0.5 V (3.8 dB) Test Tape TypeSignalUsed for P-4-A10010 kHz, 10 dBAzimuth Adjustment P-4-L300315 Hz, 0 dBPlayback Level Adjustment WS-48B3 kHz, 0 dBTape Speed Adjustment Test Mode 1.While pressing two buttons of ARL and REC MUTING , press the POWER button to turn the power on. 2.All segments of the fluorescent indicator tube are light up for about one second, and the test mode is set. The test mode has a special function as bellow. Counter RESET & MEMORY Function (1)Press the RESET button to reset the counter. (2)Press the REC button then theHbutton to starts recording. (3)After record, press thexbutton to stop recording. (4)Press thembutton to rewind the tape. (5)Rewinding tape is automatically stopped at the point where recording was started. 3.To release the test mode, press the POWER button to turn the power off. Record/Playback Head Azimuth Adjustment Procedure: 1.Mode: FWD playback 2.Turn the adjustment screw for the maximum output levels. If these levels do not match, turn the adjustment screw until both of output levels match together within 1 dB. 3.Phase Check Mode: playback 4.Change the REV playback mode and repeat the steps 1 to 3. (TC-RE340 only) 5.After the adjustment, lock the screw with locking compound. Adjustment Location: record/playback head (See page 13) Screw position L-CH peak within 1dB output level L-CH peakR-CH peak within 1dB angle R-CH peak + VH + Screen pattern GoodWrong in phase 4590135180 LINE OUT jack (J301) set R-CH L-CH47 k 47 k oscilloscope test tape P-4-A100 (10 kHz, 10 dB) 0 dB=0.775 V + set 47 k LINE OUT jack LINE IN jack 600 10 k attenuator AF OSC level meter J301 W z + set 47 k LINE OUT jack (J301) level meter Test tape P-4-A100 (10 kHz, 10 dB) 13 Tape Speed Adjustment Procedure: Mode: playback 1.Set to the test mode (See page 12). 2.Press theHbutton to playback. 3.Adjust RV301 so that the frequency counter reading becomes 3,00090 Hz. 4.Frequency difference between the beginning and the end of the tape should be within 3%. Adjustment Location: MAIN board (See page 14) Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS) (WS-48B) Playback Level Adjustment Procedure: Mode: playback Adjust RV121 (L-CH) and RV221 (R-CH) so that the reading on level meter meets the adjustment limits below. Adjustment Limits: LINE OUT level: 7.70.5 dB (0.301 to 0.338 V) Level difference between channels: within 0.5 dB Check that the LINE OUT level does not change even if playback and stop operation is repeated several times. Adjustment Location: MAIN board (See page 14) + set LINE OUT jack (J301) frequency counter test tape WS-48B (3 kHz, 0 dB) 47 k + set LINE OUT jack (J301) 47 k test tape P-4-L300 (315 Hz, 0 dB) level meter Bias Consumption Current Adjustment (TC-RE340 only) Procedure: 1.Set RV141 (L-CH) and RV241 (R-CH) to mechanical center and turn the set recording mode. 2.Connect digital voltmeter as shown by the following table. 3.Press the H button to playback. 4.Adjust the following transformers for the minimum readings on the digital voltmeter. Measurement PointAdjustment PartValue L-CHTP301 pin 2 and 3T101 minimum R-CHTP301 pin 1 and 2T201 Specified value: Maximum 220 mV Adjustment Location: MAIN board (See page 14) Record Bias Adjustment Setting: REC LEVEL volume: standard record position (See page 12) Procedure: Mode: record and playback 1.Set to the test mode (See page 12). 2.Press the REC button then theHbutton to start record- ing. 3.Press thexbutton to stop recording and press theHbutton to playback. 4.Adjust TC-KE240: RV142 (L-CH) and RV242 (R-CH), TC- RE340: RV141 (L-CH) and RV241 (R-CH) so that 10 kHz playback output is 00.3 dB relative to the 315 Hz output. Adjustment Location: MAIN board (See page 14) + set LINE IN jack (J301) (no signal) TP301321 L-CH R-CH 47 k digital voltmeter CS-413 blank tape set 47 k AF OSC Attenuator LINE IN jack (J301) 315 Hz 10 kHz 50 mV (23.8 dB) 600 10 k CS-123 blank tape LINE OUT jack (J301) level meter + TC-KE240 TC-RE340 adjustment screw adjustment screw z Adjustment Location: record/playback head 14 Record Level Adjustment Setting: REC LEVEL volume: standard record position (See page 12) Procedure: Mode: record and playback 1.Set to the test mode (See page 12). 2.Press the REC button then theHbutton to start record- ing. 3.Press thexbutton to stop recording and press theHbutton to playback. 4.Adjust RV101 (L-CH) and RV201 (R-CH) so that the reading on level meter meets the adjustment limits below. Adjustment Limits: 23.80.5 dB (47.2 to 53 mV) Adjustment Location: set 47 k AF OSC Attenuator 600 10 k CS-123 blank tape LINE OUT jack (J301) level meter LINE IN jack (J301) 315 Hz, 50 mV (23.8 dB) + z Record Bias Adjustment RV242 (R-CH) RV142 (L-CH) (TC-KE240) MAIN BOARD (Component Side) RV301 Tape Speed Adjustment T101 L-CH T201 R-CH Bias Consumption Current Adjustment LINE OUT LINE IN J301 Record Level Adjustment RV201 (R-CH) RV101 (L-CH) Playback Level Adjustment RV221 (R-CH) RV121 (L-CH) Record Bias Adjustment RV141 (L-CH) RV241 (R-CH) TP301 3 1 (TC-RE340) 15 SECTION 7 DIAGRAMS Note on 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. %: indicates tolerance. f: internal component. 5 : fusible resistor. C : panel designation. U : B+ Line. V : B Line. H : adjustment for repair. Voltages and waveforms are dc with respect to ground under no-signal conditions. no mark : STOP () : PB : REC : Impossible to measure Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal produc- tion tolerances. Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal produc- tion tolerances. Circled numbers refer to waveforms. Signal path. E: PB a: REC Abbreviation SP: Singapore model AUS: Australian Note: The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Note on Printed Wiring Boards: X : parts extracted from the component side. Y : parts extracted from the conductor side. b : Pattern from the side which enables seeing. 7-1.NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS 16 Circuit Boards Location TRANS board MAIN board LEAF SW board POWER SW board DISPLAY board H