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Marantz 1040

J

JRM

Active Member
Hi All

Please forgive me if I am posting in the wrong place. Totally new to this as a result of trying to find help with my Marantz 1040. Can anyone offer any advice on my amplifier failure that seems to have occurred after changing the power light bulb

Thank you in advance
 
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I read that it takes an 8v 60ma bulb. The guy where I bought the globe sold me a 5v 150ma bulb and a 22ohm resistor and said it will work just fine, but after installation the amplifier smoked up and I found the main caps had leaked out. Replaced them with 10000ufd 63v caps as per advice from local tech and immediately it burned out all the 4 diodes on the rectifier circuit. Not sure if anything else on power supply was destroyed as well.
 
oh and the original caps were 4700ufd 35v. The local tech said higher ufd and voltage will serve me better as they will filter better but as stated, I seem to be in a worse of position than I started. Regretting even having tried to replace the burned out bulb.
 
Hi All. I am totally new here and to this but would really appreciate some advice on my marantz 1040 that went wrong after changing out the power light bulb
 
The great folks on this site may be able to help, but you need to provide more information. What exactly is wrong, what did you replace the power lamp with (many Marantz are volt/amp specific in regards to the lamps), etc. Good luck, Rich
 
Hi Rich thanks for responding. I read that the bulb rating was 8v 60ma. The guy who sold me a replacement gave me a 5v 150ma bulb and a 220hm resistor and said it will work. Changed out bulb and 5 minutes later there's smoke. The main caps leaked out. They were 4700ufd 35v. Further advice led to replacing caps with 10000ufd 63v caps and was told it will work better as long as I don't go lower than the original capacitor values. Did that and instantly all diodes on rectifier circuit burned out as well as the 2A main fuse. Not sure yet if anything else on power supply was destroyed as well. Totally regretting even trying to restore the power light
 
Wow...

Simply replacing the bulb NEVER should have caused what your describing.

And it sounds like things went from bad to worse the more you tried repairing it.

I dont intend for this to be mean or anything. But I really think you should take it to someone who
really does know how to diagnose and properly repair vintage amps.

The idea this much power supply damage has already occurred I can only guess what else may have
been damaged that your not even aware of.... possibly.

Do you have any local or somewhat near by competent techs that your aware of?

Also if you wish to give your general location someone here might be able to recommend someone.
 
Yes I do know a bit on how to use a multimeter but not sure if its enough. I'll find out dependent on your suggestions/advice.
 
JRM said:
Further advice led to replacing caps with 10000ufd 63v caps and was told it will work better as long as I don't go lower than the original capacitor values.
Click to expand...
Pretty big leap in capacitance. Did you get the polarity correct . If one got put in ass backwards - that would do a number to the bridged rectifiers.
 
I went back and double checked and all correct. Both caps negatives go down to a common plate base. 3 white wire on positive of one cap and 2 red wires on positive of the other.
 
JRM said:
3 white wire on positive of one cap and 2 red wires on positive of the other.
Click to expand...
positive wires for the positive rail -- negative wires for the negative rail.You can't connect the negative wires to a positive capacitor lead. That puts a dead short to the bridged rectifiers.

Red wires are likely positive and white wires are likely negative.
 
Last edited:
PPstereo said:
Wow...

Simply replacing the bulb NEVER should have caused what your describing.

And it sounds like things went from bad to worse the more you tried repairing it.

I dont intend for this to be mean or anything. But I really think you should take it to someone who
really does know how to diagnose and properly repair vintage amps.

The idea this much power supply damage has already occurred I can only guess what else may have
been damaged that your not even aware of.... possibly.

Do you have any local or somewhat near by competent techs that your aware of?

Also if you wish to give your general location someone here might be able to recommend someone.
Click to expand...
The local guy I normally use suggested everything I did so far. I'm sure you can understand why I'm here instead of at his door. I'm in South Africa so?
 
You have also most likely damaged one of your 10,000uf filter capacitors.
 
JRM said:
The local guy I normally use suggested everything I did so far. I'm sure you can understand why I'm here instead of at his door.
Click to expand...

I assume you mean he might not know what he was talking about?

Kinda all the more reason to seek someone else help. Here may be able to help.

You keep later hours than me good sir. Im fast asleep by 1:30am ;)

Id say posting some pics of what the insides look like at this point. That would give folks here
something to go off of in terms of what the current situation is. And might see something they
could tell you about??

Good detailed pics at that.
 
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