Hi can anyone point me in the right direction.
My recent purchase off Ebay, a Marantz PM55-SE amplifier, seems to have been used as a football by the Post Office.
The facias is caved in and when I went to switch it on it started smoking and glowing!
I know absolutely nothing about electronics but thought attempting a repair would be a good place to begin learning. The amplifier didn't cost a lot.
I guess the first thing I need is a schematic - not that I understand how to read them but you have to start somewhere!
My recent purchase off Ebay, a Marantz PM55-SE amplifier, seems to have been used as a football by the Post Office.
The facias is caved in and when I went to switch it on it started smoking and glowing!
I know absolutely nothing about electronics but thought attempting a repair would be a good place to begin learning. The amplifier didn't cost a lot.
I guess the first thing I need is a schematic - not that I understand how to read them but you have to start somewhere!
A schematic is sure a good idea for repairing but have you assessed the internal damage?
If the circuit boards are cracked or leads and copper foil torn, controls broken, power supply
damaged etc. you need to think what expertise will be needed to fix a mess like that.
You may have to cut your losses and consider becoming a DIY builder rather than fixit.
If the circuit boards are cracked or leads and copper foil torn, controls broken, power supply
damaged etc. you need to think what expertise will be needed to fix a mess like that.
You may have to cut your losses and consider becoming a DIY builder rather than fixit.
Thanks for the quick reply. Apart from the cracked facia panel, there doesn't appear to be any immediate signs of damage - at least to my untrained eye! I have no doubt that I've probably set myself a task which is going to prove to be way beyond my understanding and capabilities. I need an idiots guide to electronics
I've just swapped over the fuse and turned it on with the cover off. There's a componet which glows. Right now I do not have a clue what it's called or what it's meant to do! It's white, about 1" x 1/2" (no idea what that is in metric) and has an inscription 3w 0.80R x 2 (that may not be correct as my eyesight ain't what it used to be either
) but there is an identical one on the other side of the board.Thanks for the link to the schematic. I'll have a shufty now and see what sense if any I can make of it.
Beware the model is not PM55 SE. There will be differences. It seems from posts that the SE version service manual is not freely available.
I cannot locate the power resistors you described. Can you read the part number or its twin part number from the print on the board? If these do not match anything, then the manual may be near to useless for you.
I cannot locate the power resistors you described. Can you read the part number or its twin part number from the print on the board? If these do not match anything, then the manual may be near to useless for you.
How much difference is there between the PM55 and the PM55-SE ?
I would have thought that they would be similar enough for an experienced engineer to work between the two.
Philips always used to promote the Marantx SE's as just Special Editions, then there were the SE Gold versions.
It was insured but I have to return it to the sender and cover the return postage. Given what I paid for the unit, it doesn't make much sense which is why I've decided to keep it and have a mess around.
The SE of the PM55 is a stripped down version, minus bass and treble controls, supposedly to give a cleaner signal. Whether the components are upgraded is unclear.
I've looked at the base of the circuit board and everything looks fine. Can't see any breaks or damage.
Right now the schematic of the PM55 is gobbledey gook but I keep on looking!
Hmmm
The SE of the PM55 is a stripped down version, minus bass and treble controls, supposedly to give a cleaner signal. Whether the components are upgraded is unclear.
I've looked at the base of the circuit board and everything looks fine. Can't see any breaks or damage.
Right now the schematic of the PM55 is gobbledey gook but I keep on looking!
Hmmm
FWIW Katie and Dad, I agree the differences often are indeed minor but occasionally there is no resemblance inside the case.
The big concern is that new parts list issues may have no resemblance to the basic model and this throws noobs way off beam
because with no expectations, there is no way to identify components or functions.
Personally, I would seek to eliminate the burning power resistor problem before looking to fix secondary matters.
Realistically, this is still going to be expensive with problems like why that resistor is burning - the money can add quickly when
unobtanium parts like the module may be needed. Trace the leads from the resistor and see where they go for an introduction
to what's ahead, Identify the parts from the board reference and schematic if you can and post them or we cannot help you..
The big concern is that new parts list issues may have no resemblance to the basic model and this throws noobs way off beam
because with no expectations, there is no way to identify components or functions.
Personally, I would seek to eliminate the burning power resistor problem before looking to fix secondary matters.
Realistically, this is still going to be expensive with problems like why that resistor is burning - the money can add quickly when
unobtanium parts like the module may be needed. Trace the leads from the resistor and see where they go for an introduction
to what's ahead, Identify the parts from the board reference and schematic if you can and post them or we cannot help you..
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