Williamrocks

I've used an AVT50h for about 4 years and a few days ago it would not turn on! I changed the original marshall fuse tube and got a ruby and it still doesn't turn on. the amp simply does not recieve power. i hope someone can help me, thanks.

stock_hippie

i play four 2 hr gigs a week...i buy cheap ...when the stuff breaks i throw it out///

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Williamrocks

Well im not gonna buy any nokia crap but i guess i'll have to buy a new ATV.

stock_hippie

good idea

amplifier

I'd at least get it checked out. Maybe it would be cheaper to fix than buying a new one.

JohnH

Does the mains light come on? if not, the problem must be right at the mains input, maybe the mains fuse (hopefully), bad mains connection lead or socket (not too hard), or blown mains tranny (oh dear! - time for new amp)

John

__________________
DSL401
8412 cab
'76 Shergold Masquerader
'93 Les Paul Studio
'83 Roadstar

Williamrocks

no lights come on at all i would rather fix it myself...but it needed i can get a new one but i rock it through a 1960 vintage cab and i really like my sound out of an avt50h haha

Dodge-City

Hi William,something like that happened to me,I had a 275 and it just wouldn start up.
The guy in the shop wouldn tell me whats wrong and just gave me a new one but he did say something to one of the other clerks which sounded like "the input is gone".I dunno if he was on about the guitar input or the power.are the fans turning on in yours?
And how do you get an avt 50 to go into a cab,arent they combo amps??!

Peter

Hey WR, if you think you can handle it (if you can't, get a technician)
WARNING: this amp has a floating ground, so don't ever use the chassis as a ground point!! You could blow your amp.

1. Check your main fuse F1, which should be between the mains input filter and the primary transformer windings (brown wire). Continue to step 2 if fuse ok. If not, make sure to replace it with a good quality fuse of the same value.

2. Check the voltages across ZD5 and ZD6 (zener diodes 5 and 6) on the main board. note: one zener will have positive voltage and one will have negative. Make sure you are getting around 15v across each. If not, check the transformer, from the black wire (ground), to each of the 2 red wires (secondary), to make sure you are getting power at the output of the transformer. You should be getting somewhere around 25VAC at each winding, I believe.

3. If you are getting voltages across ZD5 and ZD6, check for voltage at the negative side of D9, and the positive side of ZD6; it should be around +15V. Also, check for voltage from the positive side of D10 to the positive side of ZD6; it should be around -15V.
If all that is OK, I believe your amp should light up. I'll check this thread again, one of these days, to see how you did. Good luck.


PETER THE TONE DOCTOR
see my thread on AVT50 mods: Marshall AVT50 Mods

hbog

WR - I currently have the same problem as you and I found out it is the fuse.

Peter - Do you know where I can get a replacement fuse? Will any 1.5A, 120V fuse that fits be okay or do I need to get something specific?

Thanks in advance!

Peter

Cheap fuses (ie, chinese) don't pop at the rated values. The values should be as rated, but try to get one made by Littelfuse or BUSS, or if you can find another reputable company. They cost more, but at least they pop at the rated values.

PETER

zebbman

check the output chip