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Audio equipment,digital audio, home audio, professional audio systems service manuals and repair information

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File name:boss GT-8_p16-31.pdf
Size:2781 kB
Extension:pdf
Mfg:Boss
Model:gt8 🔎
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Descr:gt8 guitar multi effects
Group:Electronics > Consumer electronics > Audio
Uploaded:25-11-2009
User:andymac62
Multipart: 0  1

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File name boss GT-8_p1-15.pdf

Dec.2004 GT-8 SERVICE NOTES TABLE OF CONTENTS CAUTIONARY NOTES... 2 SPECIFICATIONS... 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 INSTRUCTIONS...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 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. 17058309E0 Printed in Japan (0500) (AS) 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 Loading Data). Output Impedance OUTPUT: 2 k SEND: 2 k Digital Output EIAJ CP1201, S/P DIF Dynamic Range 100 dB or greater (IHF-A) Process Checking Version number Factory Reset System Update Test Mode User Data Preserved Deleted Preserved Preserved Controls < Front Panel > PATCH 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 * 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 Part is sold commercially CIRCUIT BOARD NIU meant that "NOT IN USE " there don't set any contents in the Circuit Diagram. T
File name boss GT-8_p16-31.pdf

Dec.2004 Receiving Data from an External MIDI Device (Bulk Load) Making the Connections When Receiving Data Saved on a MIDI Sequencer Connect as shown below. Set the GT-8's Device ID to the same number that was used when the data was transmitted to the MIDI sequencer. fig.08-190 fig.08-220d At this stage, even more data can be received. 3. Press [EXIT] to quit Bulk Load. After you press [EXIT], "Checking..." appears in the display, indicating that the GT-8 is checking the received data. When the check is completed, the Play screen returns to the display. FACTORY RESET INSTRUCTIONS MIDI OUT Restoring the Factory Settings (Factory Reset) Restoring the GT-8 to the settings made at the factory is referred to as "Factory Reset." Not only can you return all of the settings to the values in effect when the GT-8 was shipped from the factory, you can also specify the range of settings to be reset. fig.09-060 MIDI IN 2 1 * For instructions on operating the sequencer, refer to the owner's manual for the sequencer you are using. 3 3 Receiving fig.08-191 1,2 4 1. 2. Turn off the power. While holding down PREAMP/SPEAKER On/Off button and [TYPE VARIATION], turn on the power. The Factory Reset range setting screen appears in the display. fig.09-070d 3 1. Press [SYSTEM] twice, then press PARAMETER [ "MIDI: Bulk Load" is displayed. ][ ] so that * 3. The range of data you wish to factory reset To cancel Factory Reset, press [EXIT]. Press PARAMETER [ ][ ] to move the cursor, and rotate the PATCH/VALUE dial to specify the range of settings you want to restore to factory settings. fig.08-200d 2. Transmit the data from the external MIDI device. The following appears in the display when the GT-8 receives the data. fig.08-210d value Explanation System System parameters, Harmonist scales, Auto Riff phrases, and Preamp/ Speaker, Overdrive/Distortion, and Wah Custom Edit parameter settings Quick Content of the Settings Made with User Quick Setting #1-1-#35-4 Settings for Patch Number 1-1 through 35-4 4. If you want to proceed with the factory reset, press [ENTER]. The specified range of data will be returned, and return to the Play screen. The following appears in the display when the GT-8 finishes receiving the data. 18 GT-8 SYSTEM SOFTWARE UPDATING INSTRUCTIONS Required Equipment Sequencer (MC-80 or other) MIDI cable Update disk (#17041564) 4. After the GT-8 has received all of the SMF data, a checksum (4-digit number) of the system software is run; confirm the checksum value. fig.4-01up All Completed. Sum=**** 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"). Cautionary Note Do not turn off the power to the GT-8 during writing of the system software. This will prevent the system from being written properly to the flash ROM, and as a result, the GT-8 will not operate. Test Categorie

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