Where can I get a schematic for the Bugera 1990 guitar amplifier? This amp is made off shore but is popular and sold in the US. No supplier can help...the manufacturer has no phone number for support. They have not responded to my email I need the schematic to fix problems with it.

Question moved from 'Cars and Trucks' to 'Bugera 333XL'.

https://www.google.com/search?q=BUGERA+model+333xl+schematics+for+amplifier

No Service manual, but you could ask.

Download Center - Bugera

https://www.bugera-amps.com > downloads

Find and download product manuals and drivers for your Bugera product here. ... 12345...48. Bento Box. Service. We love to help you.

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Bugera do not release service information to non Bugera service departments.

Bugera - MUSIC Group

https://www.music-group.com/brand/bugera/home

Notice of Scheduled Maintenance. This is to advise you that our system will be unavailable on Saturday, January 9, 4PM - 6PM, SGT. Please plan accordingly.

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Rig-Talk • View topic - Bugera Amplifiers

www.rig-talk.com/forum/viewtopic.php?t=138566&p=1605914

Jun 14, 2013 - 50 posts - ‎12 authors

Hi,
here is the schematics download-able:
BUGERA 333XL SCH Service Manual free download schematics eeprom repair...
Thanks,
gylacz

These amps have a few issues. I would take to a tech, and go over many of the poorly soldered connections on the circuit board.

The problem is the BOSS is designed to handle a guitar level at -20Db and the effects level is designed to run at either -10 Db or +4 Db. You will get better match setting the Bugerra effects to the -10 setting on the back and reducing the level... HOWEVER the pedal will want to send -20Db out which is 10 Db under what the effects return wants to see. This is a factor of three roughly in gain so the signal will be low. This is the problem using a guitar pedal in a way it wasn't designed to be used. The effects loops are looking for "line level" NOT guitar levels.

Schematics aren't going to help. The normal thing is to connect your guitar to the pedal and send the output of the pedal to the amp.

Guess what? The same things apply to your delay pedal... they are intended to accept the signal from the guitar OR the guitar like level from another pedal such as the GE7.

The user manual is located at: http://www.bugera-amps.com/PDF/Downloads/1960_P0671_M_EN.pdf on page 5; When the HIGH 1 and LOW 1 (or HIGH 2 and LOW 2) connectors are used simultaneously, their sensitivity is the same (both LOW). This may be your problem however--- Try swapping input chanels to see if the problem follows ther cable or is in the amp.
Assuming it was working before, you may have a short in the cable or a bad component or tube in the amp. Tubes can be difficult to come by. If the other channel works correctly, It may be one of the small tubes. Hope this helps

Wiring harness connector to the power tube section is fried. A common problem with all bugera amps and many other companies also. A cheap fix. You can order the part you need from newark.com or call 1-800-4newark the part number is sku#85c0290 mfr#09-91-0500

Try posting on some of the guitar forums. The schematics you are looking for are only available to licensed repair persons but you might get lucky and find someone who will send them to you. Be sure to state what model amplifier you want. If you are a tech try looking at some schematics for a similar amp and tracing the circuit.