Boss_roland_rc20_e_pg_8_20 电路图 维修原理图.pdf

《Boss_roland_rc20_e_pg_8_20 电路图 维修原理图.pdf》由会员分享，可在线阅读，更多相关《Boss_roland_rc20_e_pg_8_20 电路图 维修原理图.pdf（13页珍藏版）》请在收音机爱好者资料库上搜索。

1、RC-20May. 2001 8 TEST MODE Test items 1. FLASH ROM check 2. Version number check 3. Switch and LED check 4. LEVEL volume check 5. GUIDE volume check 6. DA check 7. Output check 8. INST volume check 9. MIC volume check 10. MUTE check 11. AUX IN (NORMAL) check 12. AUX IN (FLAT AMP SIMULATE) check 13.

2、AUX IN (CENTER CANCEL) check 14. AUX IN (L ch) check 15. CN2 solder spot check 16. Noise check 17. Battery operation check Note: Test items 7.to15. also include a PHRASE SELECT volume check. Items required for tests Oscillators x 2 Oscilloscope Noise meter Monitor amp FS-5U x 2 1k ohm stereo short p

3、lug 150 ohm short plug 47k ohm short plug J-5 Stereo mini monaural phone conversion cable Entering test mode Set all volumes to minimum. While holding down the left pedal (REC/PLAY/OVERDUB) and right pedal (STOP/TAP TEMPO), connect the adaptor to the ADAPTOR JACK to turn on the power. When only the

4、POWER LED is lit, within two seconds press the left pedal and then the right pedal. You will enter Test mode, and all LEDs other than PEAK will either light or blink. Note: A FLASH ROM check is automatically performed when you enter Test mode. The state of the LEDs when you enter Test mode will depe

5、nd on the result of this test. For details refer to the following item 1. FLASH check. For details on how to skip directly to a desired test item, refer to Skipping directly to the desired test, following the explanations of each test item. Explanation of each test item 1. FLASH ROM check Enter Test

6、 mode. The FLASH ROM check will be performed when you enter Test mode. If there are no problems, all LEDs other than PEAK will light. If there is a problem, the state of the LEDs will indicate the problem as follows. OVERDUB (yellow) blinking : MAKER ID error PLAY (green) blinking : DEVICE ID error

7、REC (red) blinking : BUSY error Note: If a problem was found, operation will stop and it will not be possible to proceed to the next step. Turn off the power to exit Test mode. If there are any unlit LEDs regardless of whether or not there was a problem, it is possible that the LED is faulty or sold

8、ered incorrectly. (With the exception of PEAK.) 2. Version number check Press the right pedal. The internal ROM version number and the external FLASH ROM ver- sion number will be indicated by the LEDs. Internal ROM version number display This is indicated by the four LEDs FLAT AMP SIMULATE, CEN- TER

9、 CANCEL, NORMAL, and INST & MIC. FLAT AMP SIMULATE only lit : Ver1.00 CENTER CANCEL only lit : Ver1.01 NORMAL only lit : Ver1.02 INST & MIC only lit : Ver1.03 External FLASH ROM version number display This is indicated by the following seven LEDs: REVERSE, TAP TEMPO, WRITE, EXIT, AUTO START, MEMORY

10、FULL, and LOOP QUANTIZE. REVERSE only lit : Ver1.00 TAP TEMPO only lit : Ver1.01 WRITE only lit : Ver1.02 EXIT only lit : Ver1.03 AUTO START only lit : Ver1.04 MEMORY FULL only lit : Ver1.05 LOOP QUANTIZE only lit : Ver1.06 After verifying the version, press the right pedal. All LEDs other than PEAK

11、 will light. 3. Switches and LED check Connect two FS-5U units to the PHRASE SHIFT jack and REVERSE jack. Set the FS-5U polarity switches to the position shown in the diagram. Press the REVERSE switch. Verify that REVERSE, PLAY, OVERDUB, and PHRASE USED go dark, and that TAP TEMPO changes from orang

12、e to red. Press the TAP TEMPO switch, and verify that TAP TEMPO goes dark. Press the WRITE switch, and verify that WRITE goes dark. Press the EXIT switch, and verify that goes dark EXIT. Press the AUTO START switch, and verify that AUTO START goes dark. Press the MODE switch, and verify that INST &

13、MIC, NORMAL, CENTER CANCEL, and FLAT AMP SIMULATE go dark. Press the FS-5U that is connected to the PHRASE SHIFT jack, and ver- ify that MEMORY FULL goes dark. Press the FS-5U that is connected to the REVERSE jack, and verify that all LEDs other than PEAK light. 收音机爱好者资料库 Ra d i o Fa n s .CN RC-20Ma

14、y. 2001 9 Excessive level NG Insufficient level NG (0.5 V/DIV, 1 mS/DIV)(0.5 V/DIV, 1 mS/DIV) +DC NG-DC NG (0.5 V/DIV, 1 mS/DIV)(0.5 V/DIV, 1 mS/DIV) 6. DA check Once again check the output waveform at the point that 5. GUIDE vol- ume check is completed, to check the DC leakage and level. In the fol

15、lowing cases, the result is NG. 7. Output check Set the INST volume and MIC volume to maximum. Set the PHRASE SELECT volume to the 2 position. Verify that OVERDUB and REVERSE are lit. Verify that the output waveform is as shown in the diagram. Note: The waveform will change slightly depending on the

16、 inac- curacy of the input function. 8. INST volume check Set the PHRASE SELECT volume to the 3 position. Verify that REVERSE is dark and TAP TEMPO is lit red. 4. LEVEL volume check Connect your waveform measurement equipment as shown in the dia- gram below. Connect your oscilloscope to OUTPUT. Inpu

17、t INST : 200Hz, square wave, 200 mVp-p MIC : 200 Hz, sine wave, -34 dBm AUX IN : 200 Hz, square wave, 200 mVp-p, STEREO Move the LEVEL volume to approximately the center position, and then back to the minimum position. Move the LEVEL volume from minimum to maximum, and verify that the waveform incre

18、ases smoothly. At this time, the MODE LEDs will light consecutively from FLAT AMP SIMULATE, following the waveform. With the LEVEL volume at maximum, verify that the output waveform is the same as shown in the diagram. 5. GUIDE volume check Move the GUIDE volume to approximately the center position,

19、 and then back to the minimum. Move the GUIDE volume from minimum to maximum, and verify that the waveform increases smoothly. At this time, the MODE LEDs will change successively from FLAT AMP SIMULATE, following the waveform. With the GUIDE volume at maximum, verify that the output waveform is the

20、 same as shown in the diagram. (0.5 V/DIV, 1 mS/DIV) 200 Hz, 2.2 Vp-p 0.2 Vp-p (0.5 V/DIV, 1 mS/DIV) 200 Hz, 2.2 Vp-p 0.2 Vp-p (0.5 V/DIV, 1 mS/DIV) 收音机爱好者资料库 Ra d i o Fa n s .CN RC-20May. 2001 10 (0.5 V/DIV, 1 mS/DIV) 1.2 Vp-p 0.2 Vp-p (0.5V/DIV, 1mS/DIV) (0.5V/DIV, 1mS/DIV) Set the INST volume to

21、minimum, and slowly move it to maximum. Verify that the waveform increases smoothly. Verify that that when the INST volume is at maximum, the waveform is the same as shown in the diagram. 9. MIC volume check Set the PHRASE SELECT volume to the 4 position. Verify that TAP TEMPO changes from red to gr

22、een. Set the MIC volume to minimum, and gradually move it to maximum. Verify that the waveform increases smoothly. Verify that PEAK lights as shown in the diagram. Verify that when MIC volume is at maximum, the waveform is the same as shown in the diagram. Connect a noise meter to OUTPUT, and verify

23、 that the reading is in the range of -1.0 dBm +/- 1.5 dBm. 10.MUTE check Set the PHRASE SELECT volume to the 5 position. Verify that TAP TEMPO is dark and LOOP QUANTIZE is lit. Verify that the output waveform is the same as the waveform shown in the diagram. Connect a noise meter to OUTPUT, and veri

24、fy that the reading is in the range of -22.0 dBm +/- 1.5 dBm. 11.AUX IN (NORMAL) check Set the PHRASE SELECT volume to the 6 position. Verify that LOOP QUANTIZE is dark and PHRASE USED is lit. Verify that the output waveform is the same as the waveform shown in the diagram. 12.AUX IN (FLAT AMP SIMUL

25、ATE) check Set the PHRASE SELECT volume to the 7 position. Verify that PHRASE USED is dark and INST & MIC is lit. Verify that the output waveform is the same as the waveform shown in the diagram. Press the FS-5U that is connected to the REVERSE jack, and verify that the waveform does not decrease. 1

26、3.AUX IN (CENTER CANCEL) check Set the PHRASE SELECT volume to the 8 position. Verify that INST & MIC is dark and NORMAL is lit. Verify that there is no longer an output waveform. Note: If the waveform remains, it is possible that the CENTER CANCEL section is NG, or that there is a spot of solder on

27、 the connector. 14.AUX IN (L ch) check Set the PHRASE SELECT volume to the 9 position. Verify that NORMAL is dark and CENTER CANCEL is lit. Input only the L channel to AUX IN. Verify that the output waveform is the same as the waveform shown in the diagram. Note: Verify that when compared with the o

28、utput waveform of 12. AUX IN (FLAT AMP SIMULATE) check, the phase is inverted. (0.5V/DIV, 1mS/DIV) 0.6Vp-p 0.1Vp-p (0.5V/DIV, 1mS/DIV) 2.0Vp-p 0.2Vp-p (0.5V/DIV, 1mS/DIV) 1.8Vp-p 0.2Vp-p (The start illuminating of the LED indication.) (The LED indication will stay illuminated.) 收音机爱好者资料库 Ra d i o Fa

29、 n s .CN RC-20May. 2001 11 15.CN2 solder spot check Set the PHRASE SELECT volume to the 10 position. Verify that CENTER CANCEL is dark and FLAT AMP SIMU- LATE is lit. Verify that there is no longer an output waveform. Note: If the waveform remains, it is possible that there is a spot of solder betwe

30、en pins 1-2 or 2-3 of CN2. Set the PHRASE SELECT volume to the 11 position. Verify that all LEDs are lit except for PEAK. Verify that the output waveform is the same waveform as shown in the diagram. 16.Noise check Set the PHRASE SELECT volume to the 2 position. Connect a 47k ohm short plug to the I

31、NST jack, a 150k ohm short plug to the MIC jack, and a 1 k ohm stereo short plug to the AUX IN jack. Connect a monitor amp to OUTPUT. Set the INST volume and MIC volume to the maximum. Drop the unit from a height of 10 cm, and verify that no abnormal noise is output. Turn the INST volume and MIC vol

32、ume, and verify that no abnormal noise is output. With the INST volume and MIC volume at the maximum positions, measure the residual noise, and verify that it is less than -78 dBm (IHF- A). 17.Battery operation check Put the battery in the battery compartment and insert the plug into the INPUT jack.

33、 Check that power is turned on. Check that the unit is operating normally. Note : Always check the battery after repairing or servic- ing the product. Skipping directly to the desired test Enter Test mode. The FLASH ROM check will occur automatically, and if there is no problem, all LEDs other than

34、PEAK will light. Follow the procedure described in the section for the test you want to perform. Note: In order to perform 5. GUIDE volume check, you must first perform 4. LEVEL volume check. Note: Even if it is not immediately after entering Test mode, you can select the desired test item in the sa

35、me way whenever all LEDs other than PEAK are lit. Exiting Test mode Disconnect the plug from the ADAPTOR jack to turn off the power. Cautions After repairing or servicing the product, you must check all test items. SERIAL DUMP AND UPDATE PROCEDURE The following data can be transmitted and received b

36、etween two RC-20 units without using any other devices. 1.Program The operating program is stored in CPU ROM, but some processing can be altered by applying patches. This corresponds to such patch data. 2. Guide sound 3. Phrases (1 - 11) Procedure 1. Connect the transmitting RC-20 and the receiving

37、RC-20 as follows. Connect the REVERSE jack and PHRASE SHIFT jack respectively. Transmitting RC-20Receiving RC-20 REVERSE- PHRASE SHIFT PHRASE SHIFT- REVERSE 2.Start up the transmitting RC-20 in Dump mode. 1)While holding down the TAP TEMPO and AUTO START buttons, turn on the power of the transmittin

38、g RC-20. 2)EXIT and the FLAT AMP SIMULATE and REC PLAY OVERDUB indicators will light. 3.Start up the receiving RC-20 in Update mode. 1)Turn the LEVEL knob and GUIDE knob all the way to the left. 2)Set the PHRASE SELECT knob to 1. 3) While holding down the REVERSE and MODE buttons, turn on the power

39、of the receiving RC-20. 4)Within three seconds of turning on the power, press the REVERSE button and then the MODE button. WRITE and the FLAT AMP SIMULATE and REC PLAY OVERDUB indicators will light. * In Dump mode the EXIT indicator will light, but in Update mode the WRITE indicator will light. 4.Se

40、lect the data that you want to send from the transmitting RC-20 1)Press the TAP TEMPO button to select the data that you want to send. TAP TEMPO indicator Dark : Program, Guide sound, All phrases Green : Specified phrase Red : Guide sound Orange : Program 2)If the TAP TEMPO indicator is green, use t

41、he PHRASE SELECT knob to select the phrase that will be transmitted. 5.Transmit the data from the transmitting RC-20. Transmission will begin when you press the left pedal of the transmit- ting RC-20. When the MODE indicators of both the transmitting RC-20 and the receiving RC-20 stop at FLAT AMP SI

42、MULATE, transmission/ reception has been completed. * With the factory settings, transmitting the program, guide sound, and all phrases will require approximately 15 minutes. Note : Never turn off the power until transmission/reception has been completed. (0.5V/DIV, 1mS/DIV) 200Hz, 2.2Vp-p 0.2Vp-p R

43、C-20May. 2001 12 State of the transmitting RC-20 FLAT AMP SIMULATEWaiting to transmit * The RC-20 will briefly be in this state between data items. * Since the guide sound data is divided into two parts, the RC-20 will briefly be in this state even when transmitting only the guide sound data. CENTER

44、 CANCELNow transmitting NORMALNo data for transmission State of the receiving RC-20 FLAT AMP SIMULATEWaiting for reception * The RC-20 will briefly be in this state between data items. * Since the guide sound data is divided into two parts, the RC-20 will briefly be in this state even when receiving

45、 only the guide sound data. CENTER CANCELNow receiving NORMALError * An error will also occur if memory becomes full. 6.Repeat steps 4. - 5. as necessary. 7.Turn off the power when you are finished. RC-20May. 2001 13 BLOCK DIAGRAM RC-20 Block Diagram BATTERY BOX CN6 CN3CN4+3.3V DC/DC CONVERTER IC7 O

46、UTPUT REVERSE PHRASE SHIFT AUX IN CENTER CANCEL FILTER FLAT AMP FILTER MIC INST CN1 CN2 JACK BOARD (75D433P001 2/2) CN1 AD/DA IC5 DRAM IC4 CPU IC1 FLASH MEMORY IC6 RESET IC IC7 CENTER BOARD (75D433M000) CN2CN3 CN3 CN2CN1 PANEL BOARD (75D433P001 1/2) SWLED GATE ARRAY IC3 MIC VR VR5 VR INST VR VR4 POW

47、ER LED LED17 PEAK LED LED16 IC5AIC6A IC6B IC3A IC3B IC2A IC2B Q1 IC2AIC2B RC-20May. 2001 14 CIRCUIT BOARD (PANEL, JACK) View from component side RC-20May. 2001 15 CIRCUIT BOARD (PANEL, JACK) View from foil side RC-20May. 2001 16 CIRCUIT DIAGRAM (PANEL) CENTER CANCEL PLAY FLAT_AMP SIM (green) REC INS

48、T GUIDELEVEL EXIT WRITE MODE MIC TAP TEMPO PEDAL_L REVERSE POWER REVERSE (red ) PEDAL_R AUTO START PEAK EXIT OVER DUB LOOP QUANTIZE PHRASE SELECT AUTO START PHRASE USED NORMAL INST MIC MEMORY FULL WRITETAP TEMPO TO CN2 ON CENTER BOARD TO CN1 ON JACK BOARD PEAK LED POWER L ED MIC I N MIC OUT INST O U

49、T INST IN 75D433P000 1/2 *1: 0.47/16S = Submicron Chip Capacitor *1 75D433P001 1/2 *1LOT-16LOT *17LOT- PANEL BOARD ASSY AN11 AN10 AN12 + D3.3 D AVcc A AVcc AA AVcc A + D3.3 D AVcc A DA C4 10/16 + - IC1A M5218AF 2 3 1 R8 27k R5 1M + - IC1B M5218AF 6 5 7 R6 1k R7 1MC5 10/16 D8 1SS352 SW6 SKQKAB 12 D4 1SS352 D1 1SS352 SW2 SKQKAB 12 SW1 SKQKAB 12 D2 1SS352 SW4 SKQKAB 12 VR2 RD901-40-125F-B54-11D (50KB 11clicks) 1 2 3 VR5 RD901-40-125F-AF5-00D (250KA) 1 2 3 LED4 L-