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Old 13th April 2007, 02:11 PM   #1
dark0n3 is offline dark0n3  Denmark
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Default Marantz PM66SE Question

Hi,

Just got myself a Marantz PM66SE Amp, but both the speaker outputs are dead, and the fuse in the psu was blown.

Removed the output transistors and changed the fuse, now i get powerlight, but what else can be blown ?

I know i need to buy 2x 2SC3182 and 2x 2SA1265 to replace the bad transistors.

Some help would be nice, thanks in advance

Regards
Ronni
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Old 14th April 2007, 09:33 AM   #2
dark0n3 is offline dark0n3  Denmark
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Update:

The relay dosent active when the amp is turned on, any idea on why ?
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Old 14th April 2007, 06:00 PM   #3
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check transistors in driver stage and in VA stage
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Old 14th April 2007, 07:37 PM   #4
dark0n3 is offline dark0n3  Denmark
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Got it, the driver fets are gone, what can i replace them with ?

Regards
Ronni
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Old 14th April 2007, 10:48 PM   #5
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what is that fet ?
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Old 15th April 2007, 01:55 PM   #6
dark0n3 is offline dark0n3  Denmark
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Hi.

Its a pair of:

2SB1353A and 2SD2033
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Old 15th April 2007, 02:20 PM   #7
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These aren't mosfets, but bipolar transistors.

2SB1353
http://www.rohm.com/products/databoo...df/2sb1353.pdf

2SD2033
Same specifications, but PNP.

Replacements:
2SB649 (npn) and 2SD669 (pnp)

If you can't get 649 and 669, then try the cheap and easly available MJE340/MJE350. But their Ft is only about 10MHz, and Co is higher than 2SB/2SD's 30pF.
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Old 18th April 2007, 02:24 PM   #8
dark0n3 is offline dark0n3  Denmark
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Thanks

Got some new parts home and rebuild one of the channels, but it keeps burning out the output transistors, any ideas on what to check ?

Checked all the other transistors, and they are okay.
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Old 18th April 2007, 04:23 PM   #9
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maybe the AN7026 is broken, unmont the broken output transisotrs, and check voltage on bases of drivers and predrivers transistors

http://www.tomahawk.elsat.net.pl/x.zip

this scheme should be similar to PM66SE, its PM6010
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Old 20th April 2007, 08:56 PM   #10
dark0n3 is offline dark0n3  Denmark
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Hi

ya the AN7062 is dead, no signal on output.

Gotta replace that.
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