Marantz PM66SE Question

dark0n3 · 13th April 2007, 02:11 PM

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

dark0n3 · 14th April 2007, 09:33 AM

Update:

The relay dosent active when the amp is turned on, any idea on why ?

tomahauk · 14th April 2007, 06:00 PM

check transistors in driver stage and in VA stage

dark0n3 · 14th April 2007, 07:37 PM

Got it, the driver fets are gone, what can i replace them with ?

Regards
Ronni

tomahauk · 14th April 2007, 10:48 PM

what is that fet ?

dark0n3 · 15th April 2007, 01:55 PM

Hi.

Its a pair of:

2SB1353A and 2SD2033

sixtek · 15th April 2007, 02:20 PM

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.

dark0n3 · 18th April 2007, 02:24 PM

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.

tomahauk · 18th April 2007, 04:23 PM

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

dark0n3 · 20th April 2007, 08:56 PM

Hi

ya the AN7062 is dead, no signal on output.

Gotta replace that.

13th April 2007, 02:11 PM	#1
dark0n3 diyAudio Member Join Date: Apr 2007	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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Marantz PM66SE	Brian_x	Solid State	109	16th March 2012 11:04 PM
Marantz pm66se	paulsoulsby	Solid State	1	7th August 2009 07:26 PM
Marantz PM66SE mods?	insomniac	Solid State	0	22nd June 2004 12:22 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

14th April 2007, 09:33 AM	#2
dark0n3 diyAudio Member Join Date: Apr 2007	Update: The relay dosent active when the amp is turned on, any idea on why ?

14th April 2007, 06:00 PM	#3
tomahauk diyAudio Member Join Date: Dec 2005 Location: Ruda Œl¹ska // Poland	check transistors in driver stage and in VA stage

14th April 2007, 07:37 PM	#4
dark0n3 diyAudio Member Join Date: Apr 2007	Got it, the driver fets are gone, what can i replace them with ? Regards Ronni

14th April 2007, 10:48 PM	#5
tomahauk diyAudio Member Join Date: Dec 2005 Location: Ruda Œl¹ska // Poland	what is that fet ?

15th April 2007, 01:55 PM	#6
dark0n3 diyAudio Member Join Date: Apr 2007	Hi. Its a pair of: 2SB1353A and 2SD2033

15th April 2007, 02:20 PM	#7
sixtek diyAudio Member Join Date: Jan 2007	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.

18th April 2007, 02:24 PM	#8
dark0n3 diyAudio Member Join Date: Apr 2007	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.

18th April 2007, 04:23 PM	#9
tomahauk diyAudio Member Join Date: Dec 2005 Location: Ruda Œl¹ska // Poland	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

20th April 2007, 08:56 PM	#10
dark0n3 diyAudio Member Join Date: Apr 2007	Hi ya the AN7062 is dead, no signal on output. Gotta replace that.