RCA-RS2640-cs-sm 电路图 维修手册.pdf

《RCA-RS2640-cs-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《RCA-RS2640-cs-sm 电路图 维修手册.pdf（40页珍藏版）》请在收音机爱好者资料库上搜索。

1、RS2640 Page 1-3 SPECIFICATIONS (Subject to change without notice) Line Voltage: 120vAC +/- 10% 60Hz AMPLIFIER: Power Bandwidth: 60-20,000 Hz Frequency Response: Main Channels: 60-16,000 Hz +0/-3dB Hum, at Min Volume (unweighted): 1m Vrms 6 ohms Muting Attenuation: 70 db Signal to Noise: Weighted: 65

2、 db Crosstalk: 50 db Maximum Input: 2 Vrms Power Output: 80W 10% THD Headphone Output: 6 mW AM RADIO PERFORMANCE Tuning Range: 530-1710 Usable Sensitivity 20dB S/N: 600 uV/m S/N: 40 db Auto Stop Sensitivity 1kHz: 1000 mV/m FM RADIO PERFORMANCE Tuning Range: 87.5 107.9Mhz Minimum Sensitivity: 26 dbf

3、Frequency Response: 100 10 KHz +/- 5 db Stereo Separation 1kHz: 20 db S/N Ratio stereo A-weighted: 55 dbf Auto Stop Sensitivity 99MHz: 32 dbf TAPE Frequency Response: 63 8 kHz +/-5 db S/N Ratio (Playback): 45 db Channel Separation 1 kHz: 34 db Wow & Flutter: 0.2% CD Frequency Response: 60 20,000 Hz

4、+0/-3 db S/N Ratio: 75 db Eccentricity: 140 um Vertical deviation: 780 mm RadioFans.CN 收音机爱 好者资料库 RS2640 RS2640 DISASSEMBLYDISASSEMBLY Page 2-2Page 2-1 Back Panel Removal 1.Remove cover. 2.Remove thirteen (13) screws from the back of unit as shown in Figure 2. 3.Lift CD tray to release tabs on back

5、panel as shown in Figure 2. Fig. 2 Back Panel Removal Remove screws Located on the Back of Unit. Fig. 1 Cover Removal 1/2 PAN HEAD SCREW 1 OF 5 Cover Removal Note:Perform all disassembly procedures in the order presented. When reassembling, use the reverse procedure. Make sure that all leads/wiring

6、are routed correctly when reassembling. 1.Remove the screw located on the backside of the unit as shown in Figure 1. Remove seven (7) screws located on the left and right side of the cover 2. Remove top panel by lifting upward from rear and separating tabs from backside of front plate. RadioFans.CN

7、收音机爱 好者资料库 RS2640 RS2640 DISASSEMBLYDISASSEMBLY CD Mechanism Removal 1.Plug unit in and extend the CD tray. While extended un- plug the unit. 2.Remove top cover. 3.Remove side panels. 4.Remove the back panel 5.Remove one (1) screw from the CD Arm Stop as shown in Figure 3. Fig. 3 CD Mechanism Remova

8、l Rear of Unit Rotate Gear Clockwise CD Tray CD Arm Remove (1) screw CD Mechanism Removal (Contd) 7.Remove four (4) srews fron CD Mechanism Assembly as shown in Figure 4. 8.Release one (1) wire from catch on bottom of CD Tray. 9.Release CD Mechanism Assembly from mount by pull- ing towards the rear

9、and lifting gently. Fig. 4 CD Mechanism Removal CD Arm Remove (4) screws CD Mechanism Assembly Page 2-3 Page 2-4 RadioFans.CN 收音机爱 好者资料库 RS2640 RS2640 DISASSEMBLYDISASSEMBLY CD Mechanism Removal (Contd) 10. Disconnect one (1) Ribon wire from CD Mechanism Assembly as shown in Figure 5. Fig. 5 CD Mech

10、anism Removal Risconnect Wire from CD Mechanism Assembly Page 2-5 Page 2-6 RS2640 RS2640 Page 3-2Page 3-1 ALIGNMENT PROCEDURES Operating Conditions Unless otherwise noted, the following conditions must be observed when aligning the RS2640: 1. Chassis must be operated from a 120VAC isolation transfor

11、mer, with line voltage set to 120VAC (2.0V). 2. Set controls (Volume, Tone, Balance, etc.) to mid-range. 3. Procedures must be performed in the sequence given. 4. A 10X probe must be used for oscilloscope and fre- quency measurements. 5. Minimum warm-up time is 10 minutes Required Test Equipment Per

12、sonal Computer:IBM or Compatible 486DX 66 meg PC (or LAPTOP) with 16 MEG Memory, VGA Monitor, one 3 1/2” floppy drive, 540 Meg or larger hard drive, compat- ible mouse, one parallel port dedicated for service interface box and one port for mouse, Windows 95, 4X CD ROM, Printer and Sound Card. Isolat

13、ion Transformer: Digital Voltmeter: Range .1V DC to 1000V DC, Accuracy: .5%/ True “RMS” Voltmeter: Range: 01 to 1000 Volts .5% Ac- curacy DC Voltage Supply: Range: 0 to 50V, 2AWell Filtered Temperature Controlled Soldering Station: Grounded Tip TypeTip Temperature 500F to 800F Adjustable Frequency C

14、ounter: Range: 50Hz to 100 MHz Sensitivity: 25mV to 5V. Equipped with Lo-Cap Probe (10:1 Attenua- tion) AC Variac: Continuously Variable. Isolation Type Preferred NTSC Video Signal Generator: Must provide 1V P-P Nega- tive Sync, Video into 75-OHM input. Produce, standard NTSC 75% Saturated Color Bar

15、s with 100% White Window. (B&K 1249, or equivalent) RF Signal Generator: 100 kHz to 150 MHz .1V RMS, Int. Mod. 1KHz 30% TAG001 Tuner Alignment Generator (stock # 215568) or equivalent: Equivalent Generator must have RF output capa- bilities for cable channels 1-125. Cross Hatch Generator: Must have

16、RF output. S-Video Source: Must provide standard Y-C separated sig- nal. SVHS output of VCR, DSS or DVD will suffice Dual Trace, Delayed Sweep Oscilloscope: 25 MHz with Channel invert capability. Sensitivity 5mV/cm Maximum Sweep Rate: .1us/cm. Hot Air Desoldering Station: MTS TV Stereo Generator: Mu

17、st produce L-R, L+R, SAP at 300 Hz, 1KHz, 8KHz(B&K 2009, or equivalent). ALIGNMENT PROCEDURES FM IF ALIGNMENT Test Points: Input:TP 001TP001G (RFGND) Output:TP 003TP001G (AGND) 1.Connect an FM IF signal to TP004 (Pin 39 of UIC001) and TP004G (IFGND) through a 1nF capacitor in series with a 10K resis

18、tor. 2.Connect an Oscilloscope to the IF signal output at TP009 (Pin 10 of IC001) and TP009G (AGND) through a 4.7 uF capacitor. 3.Align TF006 to obtain a clear display on the oscilloscope without any interference. 4.Ensure that the curve is not saturated. 5.Tune the set to 98.10 MHz 6.Apply an un-mo

19、dulated mono RF signal at 98.10 MHz with RF input level of 1 mV to TP001 and TP001G (RFGND). 7.Connect a frequency counter to TP003 (Pin 33 of IC001) thru a capacitor 0.1 uF 8.Check TP003 and align TF006 to get 10.7 MHz 10 KHz. TUNER SECTION 4.7uF IN OUT 10.60 10.70 10.80 TP-004 TP-004G TP-009 TP-00

20、9G 1 nF 10K Figure 1. Figure 2. FM OSCILLATOR AND RF ALIGNMENT Test Points: Input:TP001TP001G (RFGND) Output:TP007/TP008TP009G (AGND) Tuning(VT):TP002TP009G (AGND) 1.Set frequency to 87.5 MHz. Adjust FM Osc coil (L004) to obtain 1.0 to 1.05V at TP002 (VT) and TP009G (AGND). 2.Set frequency to 108.10

21、 MHz. Adjust Vari-Cap (CV002) to obtain 7.0V 0.5 at TP002 and TP009G (AGND). 3.Repeat steps 1 and 2 above until the band coverages falls within the specified VT voltage. 4.Feed a FM RF signal to a matching balanced pad (50 ohm - 75 ohm) at TP 001 and TPR001G (RFGND). 5.Use the circuit in figure 3 to

22、 detect the signal from TP 007/008 and TP009G (AGND). 6.Set frequency to 90.10 MHz and adjust L003 until maxi- mum amplitude is reached. 7.Set frequency to 106.10 MHz to see whether approxi- mate amplitude is the same as in step 6. 8.Set frequency to 98.10 MHz and check for approximate amplitude. TU

23、NER OSCILLOSCOPE DC Voltmeter IN OUT TP-001 TP-001G TP-007/008 TP-009G 4.7uF FIGURE 3 TP-002 1.00V TP-001G FM STEREO ALIGNMENT Test Points: Input:TP001TP001G (RFGND) Output:TP005TP010G (DGND) 98.10MHz TP-001 TP-001G TP-005 TP-006 152.000kHz Frequency Counter TUNER SECTION FIGURE 4 FM Signal Generato

24、r TP-010 RV-001 1.Apply an un-modulated mono RF signal at 98.10 MHz with RF input level of 1 mV to TP001 and TP001G (RFGND). 2.Search to 98.10 MHz (Remove the VT probe during search) 3.Connect a 10K from TP005 to TP010G (DGND). 4.Connect a frequency counter to TP005 (Pin 24 of IC001) and TP010G (DGN

25、D), short TP010 (Pin 27 of IC001) to TP010G (DGND, Pin 26 of IC001). 5.Check TP005 and align RV001 to get 152 KHz 1 KHz. 6.Apply a stereo 98.10 MHz signal to the set. Ensure the Stereo indicator lights up. Signal strength must be less than 32dB. 7.Remove the 10K resistor from TP005 and TP010G in- st

26、alled in step 3. RS2640 RS2640 Page 3-4Page 3-3 ALIGNMENT PROCEDURESALIGNMENT PROCEDURES AM OSCILLATOR ALIGNMENT (MW) Test Points: Input:AM Antenna LoopTP001G (RFGND) Output:TP007/TP008TP009G (AGND) Tuning(VT):TP002TP009G (AGND) 1.Set frequency to 530 KHz . 2Adjust MW Osc coil (TF003) to obtain 1.4

27、0.05V at TP 002 and TP009G. 3.Set frequency to 1710 KHz. Ensure the MW-VT at TP002 and TP009G is 8.0 1 V AM OSCILLATOR ALIGNMENT (LW) Test Points: Input:AM Antenna LoopTP001G (RFGND) Output:TP007/TP008TP009G (AGND) Tuning(VT):TP002TP009G (AGND) 1.Set frequency to 150 KHz. 2.Adjust MW Osc coil (TF003

28、) to obtain 1.51 0.01V at TP 002 and TP009G. 3.Set frequency to 283 KHz. Ensure the MW-VT at TP002 and TP009G is 4.6 1V AM IF AND AFC ALIGNMENT Test Points: Input:AM Antenna LoopTP001G (RFGND) Output:TP011TP004G (IFGND) 1.Connect an AM IF signal to AM OSC, TP012 (pin 6 of IC001) and TP001G (RPGND).

29、2.Detect the output signal at TP009 (pin 10 of IC001) and TP009G (AGND) as shown below in figure 5. 3.Adjust TF005 & TF008 until maximum amplitude is reached 4.Send an un-modulated RF signal at 1000 KHz with RF level of 100mV. 5.Tune the receiver to search up/down (remove the VT probe during search)

30、. It will stop after acquiring this signal. 6.Connect a frequency counter to TP011 (pin 36 of IC001) and TP004G (IFGND) thru a capacitor 1uF 7.Check TP011 (pin 36 of IC001) and align TF007 to get 450 KHz 1 KHz. TUNER 4.7uF IN OUT 445 450 455 TP012 FIGURE 5 1uF TP004G TP009 TP009G AM RF ALIGNMENT (MW

31、) Test Points: Input:AM Antenna LoopTP001G (RFGND) Output:TP007/TP008TP009G (AGND) 1.Apply a modulated (400 Hz) MW RF signal at 630 KHz with low RF level of 300 uV. 2.Detect the signal from TP 007/008 and TP009G (AGND). Adjust TF001 for the maximum amplitude. AM RF ALIGNMENT (LW) Test Points: Input:

32、AM Antenna LoopTP001G (RFGND) Output:TP007/TP008TP009G (AGND) 1.Apply a modulated (400 Hz) MW RF signal at 170 KHz with low RF level of 300 uV. 2.Detect the signal from TP 007/008 and TP009G (AGND. Adjust TF001 for the maximum amplitude. MAIN BOARD TAPE ALIGNMENT Alignment for the cassette portion s

33、hould be done at the semi - encased stage. AZIMUTH ALIGNMENT 1.In tape transport 1, playback a test tape (TCC-153) freq. 10 KHz. 2.Connect the speaker outputs to a dual trace oscilloscope. 3.Adjust the azimuth screw at the tape head to obtain the maximum amplitude on both channels. (Both channels mu

34、st be in phase). TAPE SPEED ADJUSTMENT 1.Rewind the test tape (MTT-111 DN 3khz) until both the spools on the left and right hubs are equal. 2.Connect the output to the WOW -FLUTTER METER. 3.Adjust the trimmer in the motor to obtain a playback freq. of 3KHz 60 Hz. RECORD BIAS OSCILLATOR ALIGNMENT 1.P

35、lace a tape inside the set. Ensure that the tape is not record protected. 2.Select Tape mode and engage the Record button. 3.Monitor TP60 and TP60G (ground). Ensure that the scope/meter does not have an activated low pass filter. Adjust L302 & L303 to obtain a voltage of 12Vrms5%. 1 234 56 7 8 910 1

36、1 12 13 14 15 1 234 56 7 8 910 11 12 13 14 15 12345 1234 12 123 1 2 3 12 L N SEE NOTE WARNING WARNING SEE NOTE SEE NOTE WARNING WARNING SEE NOTE SEE NOTE WARNING SEE NOTE WARNING SEE NOTE WARNING SEE NOTE WARNING SEE NOTE WARNING SEE NOTE WARNING SEE NOTE WARNING SEE NOTE WARNING SEE NOTE WARNING SE

37、E NOTE WARNING TDA7293 TDA7293 1N4001 KTC3875GR KTC3875GR 1N4148 1N4148 1N5402 1N5402 1N5402 1N5402 1N4001 1N4001 1N4001 1N4001 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 KIA7812 1N4001 KTA1273 -POWER_SUPPLY AUDIO_R FIL- NEUTRAL H/P_MUTE AGND AGND AMP_MUTE L -30V H/P_IN R LIVE AUDIO_L +POWER_SUPPLY F

38、IL+ +10V +10V SHIELD_GND L501L L501R IC501 IC502 N801B JP881 X885 D501 D514 R532 C806 R886D821 D819 JW07 JW08 Q501 Q503 F503 F504 R502L R512L R512R R510L R510R R502R R507R R507L R885 R881 R888 R531 R530 C522L C501R C520 C518 C528 C527 C526 C518R C518L C525 C531 C530 C521R C521L C501L C522R C524 C532

39、 C529 C533 C505R C507L C507R C505L C519R C519L C502 R889 C535C534 C538 C537 C514 C513 C502L C512 C502R C503 C515 C516 C509R C509L D503 NJ501 D501L D507 D506D505 D508 D512 D509D510 D511 D502L D502R D516 D513 D515 D501R N501 N801A R529 R525 R502 R501L R501R R512 R511 R503L R503R R510 R509 R503 R505 R5

40、04 R506R R506L C540 RF505 R505L R505R C807 D504 C805 IC503 JW05 JW04 JW3 JW2 JW1 D822 JW06 D820 X884 X883 N L C523 C539 Q502 L503L L503R L502R L502L PF01 MEDIA MULTI THOMSONAudio & Communication 4 3 2 E D C B A 65 4321 DRAWING NO. SH NO.CONT ON SHEET SH NO.CONT ON SHEET LOCATION DEPT DIV OR APPROVAL

41、S ISSUED MADE BY 4 4 Aug.29,2003 55848930 Zhou SL 55848930 DM#* # ENGINEERING FTAGZ 02 0.5uH 0.5uH STBY MUTE SGND IN- IN+ CLIP_DET BUFFER_DRIVER +VS OUT BOOT_LOADER BOOTSTRAP STBY-GND -VS -PWVS+PWVS STBY MUTE SGND IN- IN+ CLIP_DET BUFFER_DRIVER +VS OUT BOOT_LOADER BOOTSTRAP STBY-GND -VS -PWVS+PWVS 1

42、/2W 5V1 1/2W 25V 1K5 1/16W 100uF 50V 2201/2W 1/2W 7.5V 5S_5A_125V 5S_5A_125V 33K 1/16W 4R7 1/16W 4R7 1/16W 10 1/4W 10 1/4W 33K 1/16W 100K 1/16W 100K 1/16W 10k 1/4W 1/2W 3M3 1 1/4W 4K7 1/2W 4K7 1/2W 1NF 50V 5pF 50V 100nF 63V 100nF 63V 100nF100V 100nF100V 100nF100V 100nF 16V 100nF 16V 100nF100V 100nF

43、50V 100nF 50V 330nF 50V 330nF 50V 5pF 50V 1NF 50V 100nF 63V 100nF 50V 100nF50V 100nF 63V 1NF 50V 470pF 50V 470pF 50V 1NF 50V 100nF 16V 100nF 16V 100pF 50V 1 1/4W 10uF 50V 10uF 50V 22uF 25V 22uF 25V 2200uF 25V 4700uF 50V 1uF 50V 4700uF 50V 1uF 50V 47uF 25V 22uF 16V 22uF 25V 47uF 50V 47uF 50V 10K 1/16

44、W 33K 1/16W 470 1/16W 33k 1/16W 33k 1/16W 6K8 1/16W 10K 1/16W 390 1/16W 390 1/16W 1K1/16W 10 1/4W 10K 1/16W 10K 1/16W 1K 1/4W 22k 1/16W 22k 1/16W 100uF 50V 0.271W 2K2 1/16W 2K2 1/16W 100nF 50V 1/2W 2V4 100uF 50V GND OUTIN 1.3W 27V 100nF25V 100uF 50V 5uH 5uH 5uH 5uH N/A EU only TRANSFORMER (EI76X50)

45、TO N801BTO N801A X883 X884 ON XFORMER BD FUSE INSIDE XMER 23451321 BOARD AC FROM On transformer BD TO FAN US: US: A. All resistor values are in ohms L OUTPUT R OUTPUT MAIN OUTPUT 4. * and indicates critical safety B. All Capacitor values are in uF safety of this unit. to maintain proper performances

46、 and specified from replacement parts list 3. Replace transistors with type specified from replacement parts list components. Replace only with those and volume control minimum to ground under no signal conditions 2. Voltages are positive with respect 1. Unless otherwise specified: NOTES: AMPLIFIERP

47、OWER SUPPLY SCHEMATIC 1234 7 8 9 12 123456789 123456 1 2 3 4 5 6 7 8 9 10 11 12 13 1415 16 17 18 19 20 21 22 23 24 25 26 27 28 1 2 3 1 2 3 12345678910 1 2 3 1234 4 5 6 TDA7440D KTC3203Y KTC3875 KTC3875 KTC3875 KTC3875 1N4148 KTC3875 KTC3875 KTC3875 10K 10K 10K 10K 1K 1K 2u2F50V AGND R_IN4 LOUT ROUT

48、VS CREF SDA SCL D-GND TREBLE(R) R_IN2 TREBLE(L) NC2 NC1 BOUT(L) BOUT(R) BIN(R) IN(R) MUXOUT(R) IN(L) MUXOUTL L_IN4 L_IN3 L_IN2 L_IN1 R_IN1 R_IN3 BIN(L) 2u2F 50V 2u2F 50V 2u2F50V 7V5 47uF 25V 220uF 16V 560 5K6 5K6 56 5n6F 50V 100nF 50V 5n6F50V 150nF 50V 100nF 50V 150nF 50V 2u2F 50V 2u2F 50V 2u2F 50V

49、2u2F 50V 2u2F50V 47uF25V 100uF10V 2u2F50V 47K 2u2F 50V 2u2F 50V 6.5uH 100nF 50V 6.5uH 6.5uH 100nF 50V 2K2 2K2 470uF 10V 100pF50V 100pF50V 4K7 47 1.8K 100uF 10V 100nF 50V 180 22uF 25V 10K 22 1k 470K 47K 1uF10V 4K7 1uF 10V 47K 330k 1k 22 22UF 10V 22uF25V 180 10K 100uF 10V 1.8K 1/4W B. All Capacitor values are in uF A. All resistor values are in ohms, safety of this un