《Boss_roland_rc_20xl 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_rc_20xl 电路图 维修原理图.pdf（27页珍藏版）》请在收音机爱好者资料库上搜索。
1、 SERVICE NOTES Issued by RJA Copyright 2004 ROLAND CORPORATION All rights reserved. No part of this publication may be reproduced in any form without the written permission of ROLAND CORPORATION. Printed in Japan (0500) (TP)17058256E0 Sep.2004RC-20XL TABLE DF CONTENTS CAUTIONARY NOTES .2 SPECIFICATI
2、ONS.2 LOCATION OF CONTROLS .4 LOCATION OF CONTROLS PARTS LIST.5 EXPLODED VIEW, EXPLODED VIEW PARTS LIST.6 PARTS LIST.10 CHECKING THE VERSION NUMBER.13 SERIAL DUMP (SYSTEM UPDATE, USERS DATA SAVE AND LOAD).13 INSTRUCTIONS FOR FACTORY RESET.14 TEST MODE.14 BLOCK DIAGRAM.19 CIRCUIT BOARD (PANEL) .20 CI
3、RCUIT DIAGRAM (PANEL).22 CIRCUIT BOARD (JACK).24 CIRCUIT DIAGRAM (JACK 1).26 CIRCUIT DIAGRAM (JACK 2).28 收音机爱好者资料库 Ra d i o Fa n s .CN 2 Sep.2004 CAUTIONARY NOTES User data status User data status after each of the following processes is described below. Whenever carrying out procedures that involve
4、 deleting or erasing user data, always be sure to back up the user data to some form of external media (refer to Saving and Loading Data). *Executing Test Mode during Factory Reset deletes the user data. PARTS LIST Due to one or more of the following reasons, parts with parts code * cannot be suppli
5、ed as service parts. Part supplied only as a component in a complete assembly Copyright does not permit the part to be supplied Part is sold commercially SPECIFICATIONS Nominal Input Level INST:-20 dBu (variable) MIC:-40 dBu (variable) AUX IN:-10 dBu Input Impedance INST:1 M ohms MIC:1 k ohms AUX IN
6、:47 k ohms Nominal Output Level OUTPUT:-20 dBu Output Impedance 1 k ohms Recommended Load Impedance 10 k ohms or greater Internal Memory Recording time: 16 min. (max.) Maximum number of saved phrases: 11 phrases (max.) Controls REC/PLAY/OVERDUB Pedal, STOP/TAP TEMPO Pedal, INST Knob, MIC Knob, PHRAS
7、E SELECT Knob, GUIDE Knob, LEVEL Knob, REVERSE Button, TAP TEMPO Button, WRITE Button, EXIT Button, AUTO START Button, MODE Button Indicators POWER (serves also as battery check indicator), REC, PLAY, OVERDUB, PEAK, LOOP QUANTIZE, LOOP PHRASE, ONE SHOT PHRASE, TAP TEMPO, REVERSE, WRITE, EXIT, AUTO S
8、TART, MODE, INST when the delete is finished, the indicator light goes off. Do not turn off the power to the unit while the WRITE indicator or EXIT indicator is lit. All data saved to the Phrase tracks is completely deleted. 5. Repeat Steps 2-4 above for the PHRASE SELECT knob settings “2” to “4.” 6
9、. Turn off the power to the unit. 7. As per the instructions for “Serial Dump” above, set the RC-20XL to which the factory settings are being loaded as the receiving device and the RC-20XL already containing the factory settings as the transmitting device. 1) When the settings are transmitted, the T
10、AP TEMPO indicator in Step 4 of “Serial Dump” is green. 2) Set PHRASE SELECT VOLUME to “5” to execute transmission/reception of the data. 8. Set PHRASE SELECT VOLUME to “6” and repeat the procedure for 6 to 11. 9. Turn off the power to the unit. 10. Confirm that the phrases with the factory settings
11、 are saved to PHRASE SELECT VOLUME 5-11. 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
12、AMP SIMULATE) check 13. AUX IN (CENTER CANCEL) check 14. AUX IN (L ch) check 15. solder spot check 16. PHRASE SELECT volume check 17. Noise check 18. Battery operation check Items required for tests Oscillators x 2 Oscilloscope Noise meter Monitor amp FS-5U x 2 1k ohm stereo mini short plug:(#170413
13、76) 150 ohm short plug:(#17041511) 47k ohm short plug:(#17041375) Parallel box(BOSS J-5 etc.) +9V DC PLUG(AC ADAPTOR BOSS PSA-series) Stereo phone monaural phone conversion cable(PCS-31 ect.) Stereo mini monaural phone conversion cable Entering test mode Refer to the following figure and connect the
14、 diagnostic equipment. fig.setuzokuzu-e Set all volumes to minimum. While hoding the left pedal and right pedal, connecte the adaptor to the AC ADAPTOR JACK to trun on the power. When only the POWER LED is lit, within two seconds press the left pedal and then the right pedal. You will enter Test mod
15、e, and all LEDs other than “PEAK” will either light or blink. A FLASH ROM check is automatically performed when you enter Test mode. The state of the LEDs when you enter Test mode will depend on the result of this test. For details refer to the following item “1. FLASH check.” For details on how to
16、skip directly to a desired test item, refer to “Skipping directly to the desired test,” following the explanations of each test item. 150K 47K OSCILLOSCOPE CH2CH1 Noise Meter 9V PLAG PSA ADPTOR (0.5V/DIV,1mS/DIV) 200mVp-p -37dBm INST : AUX : MIC : Monitor Amp oror Parallel BOX J-5 FS-5U x 3 GND R L
17、GNDGND L sideR side Ocillator Ocillator 15 RC-20XL Exiting Test Mode Turn off the power Explanation of each test item 1.FLASH ROM check Enter Test 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 prob
18、lem, the state of the LEDs will indicate the problem as follows. “OVERDUB” (yellow) blinking : MAKER ID error “PLAY” (green) blinking : DEVICE ID error “REC” (red) blinking : BUSY error If a problem was found, operation will stop and it will not be possible to proceed to the next step. Turn off the
19、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 soldered incorrectly. (With the exception of “PEAK.”) 2.Version number check Press the right pedal. The internal ROM version number and the external FLASH R
20、OM version number will be indicated by the LEDs. Internal ROM version number display This is indicated by the four LEDs “FLAT AMP SIMULATE”, “CENTER 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”
21、 only lit : Ver1.03 External FLASH ROM version number display This is indicated by the following six LEDs: “TAP TEMPO”, “WRITE”, “EXIT”, “AUTO START”, “ONE SHOT PHRASE”, and “LOOP QUANTIZE.” “TAP TEMPO” only lit : Ver1.01 “WRITE” only lit : Ver1.02 “EXIT” only lit : Ver1.03 “AUTO START” only lit : V
22、er1.04 “ONE SHOT PHRASE” only lit : Ver1.05 “LOOP QUANTIZE” only lit : Ver1.06 After verifying the version, press the right pedal. All LEDs other than “PEAK” 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
23、 position shown in the diagram. fig.FS5U_40 Press the REVERSE switch. Verify that “REVERSE”, “PLAY”, and “OVERDUB”, go dark, and that “TAP TEMPO” changes from orange to red. Press the TAP TEMPO switch, and verify that “TAP TEMPO” goes dark. Press the WRITE switch, and verify that “WRITE” goes dark.
24、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 & MIC”, “NORMAL”, “CENTER CANCEL”, and “FLAT AMP SIMULATE” go dark. Press the FS-5U connected to the PHRASE SHIFT jack (left chan
25、nel), and confirm that the “ONE SHOT PHRASE” indicator light goes off. Press the FS-5U connected to the PHRASE SHIFT jack (right channel), and confirm that the “LOOP PHRASE” indicator light goes off. Press the FS-5U that is connected to the REVERSE jack, and verify that all LEDs other than “PEAK” li
26、ght. 4.LEVEL volume check Refer to the connection diagram in “Entering Test Mode” and connect the diagnostic equipment. Input 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 positi
27、on, and then back to the minimum position. Move the LEVEL volume from minimum to maximum, and verify that the waveform increases 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 w
28、aveform is the same as shown in the diagram. Confirm that all LEDs other than PEAK are lit. fig.DA_40 (0.5V/DIV, 1mS/DIV) 200Hz, 2.2Vp-p0.2Vp-p 5.GUIDE volume check Move the GUIDE volume to approximately the center position, and then back to the minimum. Move the GUIDE volume from minimum to maximum
29、, 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 same as shown in the diagram. Confirm that all LEDs other than PEAK are l
30、it. fig.DA_40 (0.5V/DIV, 1mS/DIV) 200Hz, 2.2Vp-p0.2Vp-p 16 Sep.2004 6.DA check Once again check the output wavwform at the point that “5.GUIDE volume check” is completed, to check the DC leakage and level.In the following cases, the result is NG. 7.OUTPUT check .Set the INST volume and MIC volume to
31、 minimum. .Set the PHRASE SELECT volume to the REVERSE are lit. .Verify that the output waveform is as shown in the diagram. fig.AUX+DA_40 (0.5V/DIV, 1mS/DIV) The waveform will change slightly depending on the inaccuracy of the input function. 8.INST volume check Set the PHRASE SELECT volume to the
32、3 position. Verify that “REVERSE” is dark and “TAP TEMPO” is lit red. Set the INST volume to 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. fig.INST_40 (0.5V/D
33、IV, 1mS/DIV) 1.2Vp-p 0.2Vp-p 9.MIC volume check Set the PHRASE SELECT volume to the 4 position. Verify that “TAP TEMPO” changes from red to green. Set the MIC volume to minimum, and gradually move it to maximum. Verify that the waveform increases smoothly. Rotate the MIC volume control and confirm t
34、hat “PEAK” lights as shown in the figure. fig.p-mic_40 Confirm that the same waveform as in the figure is produced when the MIC volume control is at maximum. fig.MIC_40 (0.5V/DIV, 1mS/DIV) Connect a noise meter to OUTPUT, and verify that the reading is in the range of -1.0 dBm 1.5 dBm. 10.MUTE check
35、 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. fig.MIC-Mut_40 (0.5V/DIV, 1mS/DIV) Connect a noise meter to OUTPUT, and verify that the reading is in the ran
36、ge of -22.0 dBm 1.5 dBm. Excessive level NGInsufficient level NG (0.5V/DIV, 1mS/DIV)(0.5V/DIV, 1mS/DIV) +DC NG(Asymmetrical:the upper and lower sides) -DC NG(Asymmetrical:the upper and lower sides) (0.5V/DIV, 1mS/DIV)(0.5V/DIV, 1mS/DIV) 2.4 Vpp 2.0 Vpp Full lighting Lighting Start 17 RC-20XL 11.AUX
37、IN (NORMAL) check Set the PHRASE SELECT volume to the 6 position. Verify that “LOOP QUANTIZE” is dark and “LOOP PHRASE” is lit. Verify that the output waveform is the same as the waveform shown in the diagram. fig.NORMAL_40 (0.5V/DIV, 1mS/DIV) 0.6Vp-p0.1Vp-p 12.AUX IN (FLAT AMP SIMULATE) check Set t
38、he PHRASE SELECT volume to the 7 position. Verify that “LOOP PHRASE” is dark and “INST & MIC” is lit. Verify that the output waveform is the same as the waveform shown in the diagram. fig.F-AMP_40 (0.5V/DIV, 1mS/DIV) 2.0Vp-p0.2Vp-p Press the FS-5U that is connected to the REVERSE jack, and verify th
39、at the waveform does not decrease. 13.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. 14.AUX IN (L ch) check Set the PHRASE SELECT volume to the 9 position. Verify th
40、at “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. fig.L-ch_40 (0.5V/DIV, 1mS/DIV) 1.8Vp-p0.2Vp-p 15.solder spot check Set the PHRASE SELECT volume to the 10 position. Verify that “CENT
41、ER CANCEL” is dark and “FLAT AMP SIMULATE” is lit. Verify that there is no longer an output waveform. 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. fig.DA_40 (0.5V/DIV, 1m
42、S/DIV) 200Hz, 2.2Vp-p0.2Vp-p 16. PHRASE SELECT volume check Set the PHRASE SELECT control to the “10” position. Confirm that the FLAT AMP SIMULATE LED goes off. Set the PHRASE SELECT control to the “9” position. Confirm that the CENTER CANCEL LED goes off. Set the PHRASE SELECT control to the “8” po
43、sition. Confirm that the NORMAL LED goes off. Set the PHRASE SELECT control to the “7” position. Confirm that the INST & MIC LED goes off. Set the PHRASE SELECT control to the “6” position. Confirm that the LOOP PHRASE LED goes off. Set the PHRASE SELECT control to the “5” position. Confirm that the
44、 LOOP QUANTIZE LED goes off. Set the PHRASE SELECT control to the “4” position. Confirm that the TAP TEMPO LED changes from red to orange. Set the PHRASE SELECT control to the “3” position. Confirm that the TAP TEMPO LED goes off. Set the PHRASE SELECT control to the “2” position. Confirm that the R
45、EVERSE LED goes off. Set the PHRASE SELECT control to the “1” position. Confirm that all LEDs other than the PEAK LED are lit. Confirm that the “POWER” indicator is lit. 17.Noise check Set the PHRASE SELECT volume to the 2 position. Connect a 47k ohm short plug to the INST jack, a 150k ohm short plu
46、g 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 volume, 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 (IHFA). 18.Battery operation check Put the battery in
免费区 
