Boss_GT-8_Effects_Processor_Service_Manual电路图.pdf

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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) (AS)17058309E0 Dec.2004GT-8 TABLE OF CONTENTS CAUTIONARY NOTES. 2 SPECIFICATIONS

2、. 2 LOCATION OF CONTROLS. 4 LOCATION OF CONTROLS PARTS LIST . 6 EXPLODED VIEW . 8 EXPLODED VIEW PARTS LIST . 10 WIRING DIAGRAM. 11 WIRING DIAGRAM PARTS LIST. 11 PARTS LIST. 12 CHECKING THE VERSION NUMBER. 17 USERS DATA SAVE AND LOAD. 17 FACTORY RESET INSTRUCTIONS.18 SYSTEM SOFTWARE UPDATING INSTRUCT

3、IONS.19 TEST MODE.19 BLOCK DIAGRAM .24 CIRCUIT BOARD (MAIN SHEET) .26 CIRCUIT DIAGRAM (MAIN SHEET 1/3) (Power).30 CIRCUIT DIAGRAM (MAIN SHEET 2/3) (Jack) .32 CIRCUIT DIAGRAM (MAIN SHEET 2/3) (Digital) .34 CIRCUIT BOARD (SW SHEET).36 CIRCUIT DIAGRAM (SW SHEET).38 ERROR MESSAGES.40 RadioFans.CN 收音机爱 好

4、者资料库 2 Dec.2004 CAUTIONARY NOTES User data status User data status after each of the following processes is described below. Whenever carrying out procedures that involve deleting or erasing user data, always be sure to back up the user data to some form of external media (refer to Saving and Loadin

5、g 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 supplied as service parts. Part supplied only as a component in a complete assembly Copyright does not permit the part to be supplied Pa

6、rt is sold commercially CIRCUIT BOARD NIU meant that NOT IN USE there dont set any contents in the Circuit Diagram. There has silk-screen only in the Circuit Board. SPECIFICATIONS GT-8: Guitar Effects Processor AD Conversion 24 bit + AF method DA Conversion 24 bit Sampling Frequency 44.1 kHz Program

7、 Memories 340: 140 (User) + 200 (Preset) Nominal Input Level INPUT: -10 dBu RETURN: -10 dBu Input Impedance : 1 RETURN: 220 Nominal Output Level OUTPUT: 0 dBu SEND: -10 dBu Output Impedance OUTPUT: 2 k SEND: 2 k Digital Output EIAJ CP1201, S/P DIF Dynamic Range 100 dB or greater (IHF-A) Controls PAT

8、CH LEVEL knob (PREAMP/SPEAKER) TYPE knob GAIN knob BASS knob MIDDLE knob TREBLE knob PRESENCE knob LEVEL knob On/Off button TYPE VARIATION button CHANNEL button SOLO button SPEAKER button (OVERDRIVE/DISTORTION) TYPE knob DRIVE knob LEVEL knob On/Off button TYPE VARIATION button (DELAY) FEEDBACK knob

9、 LEVEL knob On/Off button TAP button (CHORUS) LEVEL knob On/Off button (REVERB) LEVEL knob On/Off button (COMP) On/Off button (EQ) On/Off button (WAH) On/Off button (LOOP) On/Off button (FX-1) On/Off button (AMP CTL) On/Off button (FX-2) On/Off button (MASTER) MASTER button PATCH/VALUE dial PARAMETE

10、R buttons OUTPUT SELECT button EXIT button WRITE button SYSTEM button EFFECT CHAIN button NAME button ProcessUser Data Checking Version number Preserved Factory Reset Deleted System Update Preserved Test Mode Preserved RadioFans.CN 收音机爱 好者资料库 3 GT-8 TUNER/BYPASS button CTL/EXP button VARIABLE button

11、 MANUAL button BANK pedals Number pedals CTL pedal Expression pedal Expression pedal switch OUTPUT LEVEL knob POWER switch Display 16 characters, 2 lines (backlit LCD) 2 characters, 7 segment LED Connectors INPUT jack OUTPUT jacks L (MONO)/R PHONES jack SEND jack RETURN jack AMP CONTROL jack SUB EXP

12、 PEDAL/SUB CTL PEDAL1,2 jack DIGITAL OUT connector (coaxial) MIDI connectors IN/OUT AC Adaptor jack Power Supply AC 14 V; Supply AC adaptor (BOSS BRC series) Current Draw 650 mA Dimensions 515 (W) x 261 (D) x 75 (H) mm 20-5/16 (W) x 10-5/16 (D) x 3 (H) inches Maximum height: 515 (W) x 261 (D) x 107

13、(H) mm 20-5/16 (W) x 10-5/16 (D) x 4-1/4 (H) inches Weight 4.8 kg/10 lbs 10 oz (excluding AC Adaptor) Accessories AC AdaptorBRC-240AT (#G2457142) BRC-230T (#G245714101) BRC-120T (#G2457144) BRC-100T (#G2457143) Owners Manual English:(#G6047002) Japanese:(#G6047001) Read This First (leaflet) (#G60470

14、05) USER Patch List (#G6027108) PRESET PATCH LIST (#G6027107) Roland Service (information sheet) (#*) Options Foot Switch: FS-5U, FS-5L Dual Foot Switch: FS-6 Expression Pedal: EV-5 (Roland), FV-300L Foot Switch Cable: PCS-31 (Roland) (1/4 inches Phone Plug (stereo) - 1/4 inches Phone Plug (mono) x

15、2) MIDI IMPLEMENTATIONENGLISH: (#17041558) JAPANESE: (#17041557) *0 dBu = 0.775Vrms *In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice. *AF Method (Adaptive Focus method) This is a proprietary method from Roland trans

16、fer the files to the GT-8 in sequence, starting from GT8_01.mid. GT-8 System Ver.*.* SMF Disk: GT8_01.mid GT8_02.mid GT8_03.mid GT8_04.mid GT8_05.mid GT8_06.mid GT8_07.mid GT8_08.mid GT8_09.mid GT8_10.mid GT8_11.mid GT8_12.mid GT8_13.mid GT8_14.mid GT8_15.mid GT8_16.mid Update the GT-8 system using

17、the following procedure. 1.Connect the sequencers MIDI OUT connector and the GT-8s MIDI IN connector with a MIDI cable. 2.Hold down the ASSIGN CTL/EXP, NAME, and MANUAL buttons and turn on the power to the GT-8. fig.2-01up appears in the LCD display, indicating the GT-8 is in standby mode. 3.Transmi

18、t the SMF data in GT8_01.mid from the sequencer to the GT-8. When MIDI signals are received by the GT-8, the write address and checksum appear in the LCD display. fig.3-01up When reception of GT8_01.mid is completed, fig.3-02up appears in the GT-8s LCD display. Subsequently, the following is display

19、ed. fig.3-03up Transmit the SMF data in GT8_02.mid from the sequencer. In the same manner, continue to play back the SMF data in the remaining files until the data in GT8_16.mid is loaded. 4.After the GT-8 has received all of the SMF data, a checksum (4-digit number) of the system software is run; c

20、onfirm the checksum value. fig.4-01up TEST MODE If the GT-8 contains any user data, be sure to back up the data to a sequencer (MC-80 or other) before servicing (for instructions on holding user data, refer to “Saving Data” and “Loading Data”). Test Categories 1.DSP Check 2.Display 3.LCD Contrast 4.

21、Switch 5.VR Check 6.EXP PEDAL 7.Battery 8.MIDI IN/OUT 9.AMP CTRL 10.OUTPUT D/A 11.EXT LOOP 12.INPUT A/D 13.DSP INT0 14.Noise(IN-OUT) 15.Noise(LOOP) 16.Calibrate EXP 17.Factory Load Required Equipment Expression Pedal (Roland EV-5) MIDI cable Oscilloscope Audio instrument which has DIGITAL in and Ana

22、log out. Guitar amp (equipped with jacks for switching channels/channel- switching jack) Oscillator 2 monitor amps Noise meter Blank plug Entering Test Mode Simultaneously hold down the DELAY and REVERB buttons and turn on the power to the GT-8. The version number and checksum appear in the lower ro

23、w of the LCD display. fig.test Press the PARAMETER button to proceed to “1. DSP Check.” FJ: Waiting SMF GT8_01.mid GT8_01.mid SUM * * Now Updating. * * FJ: Waiting SMF GT8_02.mid All Completed. Sum=* GT-8 Build* Ver. *.* * 20 Dec.2004 Quitting Test Mode Power off the unit. 1.DSP Check Press WRITE; t

24、he DSP is checked, and the results of the check are displayed. If an error has occurred, the type of error is indicated; if the DSP is operating properly, “OK” is displayed. If operating properly fig.1-01test If an error has occurred (NG: No Good) fig.1-02test Press the EXIT button, then press the P

25、ARAMETER button to proceed to “2. Display.” 2. Display Press WRITE; all of the LCD segments light up, and all LED indicators and seven-segment LEDs remain lit. Press EXIT to proceed to “3. LCD Contrast.” 3. LCD Contrast fig.3-01test Rotate the PATCH/VALUE dial in the following procedure to confirm t

26、he corresponding changes in the LCD contrast. 1) Rotate the dial counterclockwise; the contrast decreases and the screen darkens. Rotate the dial until the contrast reaches 0. 2) Rotate the dial clockwise; the contrast increases and the screen brightens. Rotate the dial until the contrast reaches 15

27、. Press the EXIT button, then press the PARAMETER button to proceed to “4. Switch.” 4. Switch Press the WRITE button; all of the LEDs light up, and the name of the button being checked appears in the lower row of the LCD. fig.4-01test Press the switch corresponding to the indicated button. “Wrong Sw

28、itch” appears in the display if the incorrect switch is pressed. For buttons with LEDs, confirm the following. 1) The LED is lit before the button is pressed. 2) The LED is off after the button is pressed. Press the switches in the following sequence. 1 Check of the effect select buttons and edit bu

29、ttons: PREAMP - PRE VARIATION - PRE Ch A - PRE Ch B - PRE SOLO - PRE SPEAKER - OD/DS - OD/DS VARIATION - DELAY - DELAY TAP - CHORUS - REVERB - FX-2 - FX-1 - WAH - COMP - EQ - LOOP - AMP CTL - MASTER - ASSIGN CTL/EXP - FX CHAIN - EXIT - PARAMETER ( PARAMETER () - WRITE - NAME - ASSIGN VARIABLE - MANU

30、AL - TUNER/BYPASS - SYSTEM - OUTPUT SELECT 2 Check of the pedal switches and expression switches: BANK DOWN - BANK UP - BANK UP(EXP) - CTL PEDAL - PEDAL 4 - PEDAL 3 - PEDAL 2 - PEDAL 1 3 Seven-Segment LEDs Confirm that the segments in the seven-segment LEDs go off one at a time each time WAH is pres

31、sed. All of the segments should be off after the WAH button is pressed 14 times. Press the PARAMETER button to proceed to “5. VR Check.” 5. VR Check Confirm that all of the VRs are turned down to the MIN position. Press the WRITE button; the name of the VR being checked appears in the bottom row of

32、the LCD. Rotate the indicated display. fig.5-01test 1 Clicking VRs PRE TYPE - OD/DS TYPE Rotate the knob from MIN to MAX and back to MIN, and confirm that the value indicated in the seven-segment LEDs matches the corresponds notch position. 2 Non-clicking VRs PATCH LEVEL - PRE LEVEL - PRE PRESENCE -

33、 PRE TREBLE - PRE MIDDLE - PRE BASS - PRE GAIN - OD/DS DRIVE - OD/DS LEVEL - DELAY FEEDBACK - DELAY LEVEL - CHORUS LEVEL - REVERB LEVEL Rotate the knob from MIN to MAX, and confirm that the segments in the seven-segment LEDs light in sequence from the bottom in correspondence with the change in knob

34、 position. After all have been checked, “OK” appears in the display. Press the PARAMETER button to proceed to “6. EXP PEDAL.” 6. EXP PEDAL Confirm the changes in the GT-8s EXP pedal as an expression pedal connected to the SUB EXP PEDAL/SUB CTL 1,2 jack. Connect an EV-5 to the SUB EXP PEDAL/SUB CTL 1

35、,2 jack. Press the WRITE button. The display changes to the following. fig.6-01test Press the GT-8 EXP pedal and confirm that content shown in the LCD changes as described below. 1) When the pedal is position approximately midway: fig.6-02test 2) When the pedal is pressed fully forward: fig.6-03test

36、 3) When the pedal is brought back fully: fig.6-04test If the pedal is functioning properly, the display changes to the following; use the same procedures to check the EV-5. fig.6-05test Press the PARAMETER button to proceed to “7. Battery.” 1.DSP Check - OK ! - 1.DSP Check PRAM:NG ERAM: 1.DSP Check

37、 PRAM:- ERAM:NG- 3.LCD Contrast Contrast=15 4.Switch PREAMP 5.VR Check PRE TYPE 6.EXP PEDAL - 6.EXP PEDAL -*- 6.EXP PEDAL -* 6.EXP PEDAL * 6.SUB EXP PEDAL - 21 GT-8 7. Battery Press the WRITE button; the voltage of the memory backup battery is displayed. fig.7-01test Error indications: “*.*V Low”: W

38、hen the battery voltage is 2.0-2.6 V. “No Battery!”: When there is no battery, or when the battery voltage is below 2.0 V. If the above occurs, supply the unit with a new lithium battery. Press the EXIT button and then press the PARAMETER button to proceed to “8. MIDI IN/OUT.” 8. MIDI IN/OUT fig.8-0

39、1test Connect the MIDI IN and MIDI out connectors with a MIDI cable. Press the WRITE button. If the two connectors are not connected by the MIDI cable, “No Connect” appears in the bottom row of the LCD display. If the two connectors are properly connected, “Verify OK!” is displayed. Press the PARAME

40、TER button to proceed to “9. AMP CTRL.” 9. AMP CTRL Connect the AMP CTRL jack and the channel switching jack on the guitar amp. Press the WRITE button; AMP CTRL automatically switches on/off. fig.9-01test Confirm that the guitar amp channels are switched. Press the EXIT button and then press the PAR

41、AMETER button to proceed to “10. OUTPUT D/A.” 10. OUTPUT D/A Set the oscilloscope are follows. 1.0 V/DIV, 0.5 ms/DIV Press the WRITE button; a rectangular wave is output from the OUTPUT jack, and Mute is switched on/off. fig.10-01test Set the OUTPUT VR to MAX. Connect only the OUTPUT L(MONO) jack to

42、 the oscilloscope (Channel 1), and confirm that the waveform alternately changes as shown below. Do not connect anything to OUTPUT R. f i g . 0 0 1 . e p s f i g . 0 0 2 . eps Connect only the OUTPUT R jack to the oscilloscope (Channel 2), and confirm that the waveform alternately changes as shown b

43、elow. f i g . 0 0 3 . e p s f i g . 0 0 2 . eps Connect the oscilloscope (Channel 1 and 2) to the PHONES jack, and use the same procedure to confirm the waveform output. Connect the oscilloscope (Channel 1 and 2) to the digital to analog converter, and use the same procedure to confirm the waveform

44、output. Connect the oscilloscope (Channel 1) to the SEND jack, and confirm that the waveform alternately changes as shown below. f i g . 0 0 4 . e p s f i g . 0 0 2 . eps Press the EXIT button and then press the PARAMETER button to proceed to “11. EXT LOOP.” 11. EXT LOOP Connect the OUTPUT L/R jacks

45、 to the oscilloscope (Channel 1 and 2). Press the WRITE button. fig.11-01test Confirm that the following type of waveform is output. fig.005.eps Insert the blank plug in the RETURN jack, and confirm that there is no waveform. After confirming this, remove the blank plug from the RETURN jack. Press t

46、he EXIT button and then press the PARAMETER button to proceed to “12. INPUT A/D.” 7.Battery 3.1V 8.MIDI IN/OUT 9.AMP CTRL CTRL Off 9.AMP CTRL CTRL On 10.OUTPUT D/A Mute Off/- 10.OUTPUT D/A Mute -/On 11.EXT LOOP DSPEXTOUT 22 Dec.2004 12. INPUT A/D Input a rectangular wave, and observe the output waveform with the oscilloscope. INPUT: Rectangular wave, 400 Hz, 40 mVp-p Press the WRITE button. fig.12-01test Confirm that the following type of wave