BBK-BX900U-cs-sm 电路图 维修手册.pdf

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1、 Model: BX900U CONTENTS PAGE Specifications . 1-6 Block Diagram . 7 Safety Checks . 8-9 Wiring Diagrams.10 Schematic Diagrams.11-12 Printed Circuit Boards. 13-14 Exploded View . 15 RadioFans.CN 收音机爱好者资料库 永 福 电 子 有 限 公 司 永 福 电 子 有 限 公 司 YUNG FU ELECTRONICS LTD YUNG FU ELECTRONICS LTD Model No CD003 D

2、ate:2013-1-17 Section: FM TUNER Page: 1 of 6 Measuring Items Condition Unit Normal Limit Test Data 1 2 3 Tuning Frequency Range Low End MHz 64 +/-0.5 High End MHz 108 +/-0.5 Intermediate Frequency MHz 10.7 +/-0.1 Max. Sensitivity 64MHz dB 20 90MHz dB 20 106MHz dB 20 -30dB Quieting S/N Sensitivity 64

3、MHz dB 26 90MHz dB 26 106MHz dB 26 Dial Calibration 64MHz MHz 0.5 60MHz MHz 0.5 106MHz MHz 0.5 IF Rejection 90MHz dB 40 35 Image Rejection 106MHz dB 26 20 AM Rejection 90MHz dB 40 30 RF Overload Distortion:100dB 75KHz Dev 90MHz % 3 4 10%THD Output Power 75KHz Dev 90MHz W 8 7.8 Maximum o/p 75KHz Dev

4、60dBW 8 7.8 Distortion at Max Volume 22.5KHz Dev Distortion at Max Volume,75KHz Dev 90MHz % 10 90MHz % 25 -6dBAudio Fidelity Low Freq Hz 100 150 High Freq KHz 4.5 3.8 -3dB Limiting Sensitivity 90MHz dB 30 35 Distortion at Ref Output,75KHz Dev 90MHz % 1 3 S/N Ratio with 1mV 90MHz dB 50 40 Modulation

5、Hum 90MHz dB 55 45 Noise Output (Hum and Noise) Max Vol mV Min Vol mV 3 Auto Tuning Stop(Seek) Sensitivity 64MHz dB 20 28 90MHz dB 20 28 106MHz dB 20 28 Fall Out Voltage(AC) 90MHz % 70 Fall Out Voltage(DC) 90MHz % 70 Fall Out Voltage 9VDC Clock Backup % -30 AFC Holding 3dB KHz Stereo Separation: 1Mv

6、75KhzDev 100HZ dB 1KHZ dB 28 10KHZ dB Stereo indicator Sensitivity 90MHZ dB 24 28 Mono/Stereo Output Difference 90MHZ dB 1 L/R Channel Output Difference dB 3 Test Conditions Approved By: 程挺锋 1.Supply Voltage : AC 220-240V 50Hz 2.Standard Output : 50 Mw 3.Speaker impedance: 4 OHM RadioFans.CN 收音机爱好者资

7、料库 SPECI FI CA T I O NS 1 永 福 电 子 有 限 公 司 永 福 电 子 有 限 公 司 YUNG FU ELECTRONICS LTD YUNG FU ELECTRONICS LTD Model NO: CD003 Date: 2013-1-17 Section: CD Page: 2 of 6 Measuring Items Condition Unit Norm al Limit Test Data 1 2 3 Distortion at Max Vol CD-1(0dB) 1KHz % 25 CD10% THD Output Power CD-1(OdB) 1

8、KHz W 8 7.8 CD Output Level Voltage(Max) 1KHz W 8 7.8 Frequency Response Speaker Output CD-1,1Khz at Reference Output OdB 63Hz dB 100Hz dB +/-3 1KHz dB 10KHz dB +/-3 20KHz dB THD at Standard Output(at-10dB) 1KHz % 1 Separation:CD-1at Speaker Output 100Hz dB 1KHz dB 45 40 10KHz dB S/N Ratio(Input Fil

9、ter) Dynamic Range Initial Reading Time TCD-782 dB 45 TCD-782 Sec TCD-782 Sec 10 Access Time: TCD782 First Track Sec 8 Last Track Sec 10 Interruption Philips#444A Scratch mm 0.8 Black Doc mm 0.6 Fingerprint mm 0.075 Eccentricity TCD-712R mm Vertical Deviation TCD-713R mm 0.8 Hum and Noise Vol Max mV

10、 10 Vol Min mV 3 Minimum Operating Voltage(AC) % 80 Minimum Operating Voltage(DC) % 70 Maximum power Consumption Full load burn-in W Test Conditions Approved By: 程挺锋 1.Supply Voltage : AC 220-240V 50Hz 2.Standard Output : 50 mW 3.Speaker impedance: 4 OHM RadioFans.CN 收音机爱好者资料库 SPECI FI CA T I O NS 2

11、 永 福 电 子 有 限 公 司 永 福 电 子 有 限 公 司 YUNG FU ELECTRONICS LTD YUNG FU ELECTRONICS LTD Model NO: CD003 Date: 2013-1-17 Section:EQ Page: 3 of 6 Measuring Items Condition Unit Norm al Limit Test Data 1 2 3 ROCK 20Hz dB 100Hz dB 1K dB 10K dB 20K dB CLAS 20Hz dB 100Hz dB 1K dB 10K dB 20K dB POP 20Hz dB 100Hz

12、dB 1K dB 10K dB 20K dB JAZZ 20Hz dB 100Hz dB 1K dB 10K dB 20K dB FLAT 20Hz dB 100Hz dB 1K dB 10K dB 20K dB Test Conditions Approved By: 程挺锋 1.Supply Voltage : AC 220-240V 50Hz 2.Standard Output : 50 mW 3.Speaker impedance: 4 OHM SPECI FI CA T I O NS 3 YUNG FU ELECTRONICS LTD YUNG FU ELECTRONICS LTD

13、Model NO: CD003 Date: 2013-1-17 Section: Audio Page: 4 of 6 Measuring Items Condition Unit Normal Limit Test Data 1 2 3 Max Power O/P at Headphone 90MHz MW FM 75KHz Dev 1KHz CD OdB 1KHz AUX IN 500mV 1KHz BLUETOTH 784 OdB 1KHz dB +/-3 90KHz dB +/-3 784 OdB 1KHzdB +3/-0 OdB 1KHz dB +3/-0 784 OdB 1KHzd

14、B Bass Boost 100Hz dB 125Hz dB Test Conditions Approved By: 程挺锋 1.Supply Voltage : AC 220-240V 50Hz 2.Standard Output : 50 Mw 3.Speaker impedance: 4 OHM SPECI FI CA T I O NS 4 永 福 电 子 有 限 公 司 永 福 电 子 有 限 公 司 YUNG FU ELECTRONICS LTD YUNG FU ELECTRONICS LTD Model NO: CD003 Date: 2013-1-17 Section: AUX

15、 SECTIONAUX SECTION Page: 5 of 6 Measuring Items Condition Unit Normal Limit Test Data 1 2 3 10%T.H.D Power O/P 500MV(Input) W 8 7.8 Stereo Separation 180MV(Input) dB 38 35 Min Hum 180MV(Input) mV 0.7 2 Max Hum mV S/N dB 55 50 Total Harmonic Distortion % 0.5 1 Test Conditions Approved By: 程挺锋 1.Supp

16、ly Voltage : AC 220-240V 50Hz 2.Standard Output : 50 Mw 3.Speaker impedance: 4 OHM SPECI FI CA T I O NS 5 永 福 电 子 有 限 公 司 永 福 电 子 有 限 公 司 YUNG FU ELECTRONICS LTD YUNG FU ELECTRONICS LTD Model NO: CD003 Date:2013-1-17 Section: BLUETOOTH Page:6of 6 Measuring Items Condition Unit Norm al Limit Test Dat

17、a 1 2 3 Distortion at Max Vol 784(0dB) 1KHz % 25 CD10% THD Output Power 784(OdB) 1KHz W 8 7.8 CD Output Level Voltage 1KHz W 8 7.8 Frequency Response Speaker Output CD-1,1Khz at Reference Output OdB 63Hz dB 100Hz dB +6/-3 1KHz dB 10KHz dB +6/-3 20KHz dB THD at Standard Output(at-10dB) 1KHz % 1 Separ

18、ation:CD-1at Speaker Output 100Hz dB 1KHz dB 45 40 10KHz dB S/N Ratio(Input Filter) TCD-784 dB 40 Hum and Noise Vol Max mV 15 Vol Min mV 5 Minimum Operating Voltage(AC) % 80 Minimum Operating Voltage(DC) % 70 Test Conditions Approved By: 程挺锋 1.Supply Voltage : AC 220-240V 50Hz 2.Standard Output : 50

19、 Mw 3.Speaker impedance: 4 OHM SPECI FI CA T I O NS 6 BLO CK D IA G RA M 7 5 SAFETY CHECKS Important Note! Do the following safety checks after servicing this unit. 1. Remove all the externally connected test equipment and wires before testing the unit. 2. Use the safety test circuit as shown below.

20、 3. Plug the power cord or unit to be tested into the test receptacle. 4. Switch the unit being tested to ON or PLAY. 5. Connect external jack/terminal contact VTVM across a 1k resistor in the test circuit. Set the meter to a high (150V AC) scale to avoid meter damage and then touch the points with

21、the test probe. If the meter reading indicates less than 3 volts on all test points, set the meter to a low (3V AC) scale and repeat the test. 6. Any reading greater than 0.2 volt indicates a potential shock hazard. If this occurs, determine the cause of the leakage, correct the problem, and repeat

22、the safety test. ALIGNMENT AND ADJUSTMENT SERVICE ADJUSTMENT Lubrication The mechanical parts are factory coated with a thin coat of light grease and should not require further lubrication. If a light grease is applied, be careful not to get any grease on the play/record head or erase head, hubs, pu

23、lleys, tapes reels, drive belts, or switches. Use a good lubricant such as Silicon Lube G331L or Lubricate (00). Service Check Before aligning the mechanism, wipe off any accumulated dirt with denatured alcohol. Wipe around parts where the tape contacts and around all rotating parts. Drive belts are

24、 specially processed. Do not clean them with alcohol. 8 7 CD PLAYER CHECKING PROCEDURES A. WAVE E/F BALANCE ADJUSTMENT 1) Test Point : VC, TS10. 2) Test Disc : Sony Test CD Type 3. 3) Test Equipment : Scope : DC 0.2 V 0.5 ms. 4) Test Mode : Play Sony CD, Type 3, Track 1, Press FF. (Fast Forward), Un

25、til A=B (as Figure Bellow). SCOPE : DC POSITION A B Figure A B. FOCUS-BIAS ADJUSTMENT 1) Test Point : VC RFO. 2) Test Disc : Sony Test CD, Type 3. 3) Test Equipment : Scope : DC 0.5 V 0.5 ?s. 4) Test Mode : Play Sony CD, Type 3, Track 1, Make Wave Form (Eye Pattern) Max. And Clear. SCOPE : AC POSITION Figure B 9 W I RI NG D RA W I NG 10 SCH EM A T IC D IA G RA M S 11 SCH EM A T IC D IA G RA M S 12 SCH EM A T IC D IA G RA M S 13 PRINT ED CIRCU IT BO A RD S 14 PRI NT ED CIRCU IT BO A RD S 15 16