Question about Amplifiers & Preamps

2 Answers

Marantz PM-74D she powers up and i can get some lights to come on but no power output ive checked everything. she just quit one day when i was listining to it. i wish i could find a trouble shooting guide or something to help i like to fix things myself. please help

Posted by on

2 Answers

Just another follow up, those are 10 ohm resistors not 920 like I'd thought. Marantz did some goofy things with the color bands I guess-brown black black red white-but they're 10 ohms for sure. Odd though because the other two right next to them are ten ohms as well-brown black black gold. Mine was biased a little hot, but I adjusted both channels to idle cooler and it works fine now.....

Posted on May 26, 2008

OOPS-forgot to mention if your bias turns out ok after replacing any blown outputs, turn it off and resolder the collectors (center) pins of all 4 output transistors and turn it back on-should work but you'll need to recheck bias and dc offset. They appear to both be adjustable on the board sticking up on the top side-it's right in the middle and has 4 trim pots on it......

Posted on May 26, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Marantz pm 6004 blikining red power standby


Are the speakers connected?

If so , you have an output DC voltage issue ( typically outputs dont want to see more than 100mV DC going to the speakers. If that happens , the Protect circuit will kick in. Find a repair tech in your area because I think this amp is worth fixing

May 21, 2014 | Marantz Amplifiers & Preamps

1 Answer

Hello i have a marantz pm-47 amp that keeps blowing every time i plug in the power feed to the amp board i have changed the 2 caps on the board but still have the same problem i checked voltage for...


Hi mas_66,
Make sure that the fuse is the same rating with the old one.
If still symptom persist, I've suspected that your output IC is shorted.
You may hang this IC, then power up the unit.
Observe what will happen, if this cure the symptom then this is a clear indication that this IC is shorted and made the fuse blown while it is in the circuit board.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Mar 08, 2011 | Marantz PM-68 Amplifier

1 Answer

Can i connet my marantz ki17 amp to a power amp


Hi, i don't really understand why you want to connect an amplifier to an amplifer.
Might be that you want to get a louder volume or ?don't know.

I don't think there is any need for you too connect marantz ki17 amp to a power am. Both do the same work, but might have different watts.
So you will need to check what you want to connect with the amplifier first and check the watts that can carry it without interference from the amplifier.

I guess that would do the magic.

Have a nice day.

Feb 18, 2011 | Marantz PM-15S1 2-Channel Amplifier

1 Answer

The fuse keeps blowing in my marantz pm-57 amplifier. It says it takes a T 2.5A 250V fuse. I can only find 2.5A 250V fuses. What relevance is the ''T''.


Goo day sir, the T on the fuse has nothing to do on you marantz fuse blowing up, chances are you amplifier is shorted, check you IC amplifier/power transistor for shorts. Check also your speaker impedance. usually they are 8 ohms. You can use a technician's multitester device to check the impeadance. An imbalance or mismatch speaker can cause a fuse to blow and destroy your amplifier. hope this helps.

Jul 31, 2009 | Marantz PM-15S1 2-Channel Amplifier

1 Answer

Marantz pm 15 s1 amplifier and marantz sa15 s1 Cd player


There really is no point in  connecting the two components with an optical (=digital) cable, if you didn't want to use the SA-15s DAC- and analog output section you might aswell have bo bought the chiepest one you could find...

To get better sound than the SA-15s analog outputs can provide, you would have to spend a load of money (not as much as for the SA-15 but quite a bit) on a DAC - and the DAC would only work with CDs, you would still have to use the SA-15s analog outputs to listen to SACDs.

So in conclusion:
-Use the SA-15s analog outputs

-If you have other digital sources that you want to use - if you care about their sound quality - you can sell/return the SA-15s, buy the chiepest CD-Player you find (only look and feel matter) and spend the rest on a good DAC. (note: SACDs won't play on this setup)


I'm using a PM-15S1 with a DAC (Apogee Mini DAC, Studio-Equipment, nominal price ~1000$, got mine 2nd hand for 400€ ) myself. A DAC is usually the better choice over an expensive CD-Player - especially if you've got other digital sources (PC, ...) - but you'll probably lose a lot of money if you sell the SA-15, so think about it (IF you're still thinking about it, I realise that your question is 8 months old...)


anyway... have fun with the PM-15, it sure is beauty

Jan (Hamburg, Federal Republic of Krautistan)

Jul 01, 2009 | Marantz PM-15S1 2-Channel Amplifier

1 Answer

Heat in operation of marantz pm 74d


Sounds like your left channel output transistors are getting weak.

Jan 17, 2009 | Marantz PM-68 Amplifier

1 Answer

Can I remotely control speaker outputs on the Marantz PM 8003?


HI...
You need an 8 ohm stereo "L-pad"
Try partsexpress.com
or
mcmelectronics.com

Dec 21, 2008 | Marantz Amplifiers & Preamps

1 Answer

Marantz PM 4000 has cut out


May be the problem solved here :
http://www.audiotoolers.com/ubbt/ubbthreads.php/ubb/showflat/Number/5316/page/1#Post5316

Nov 21, 2008 | Marantz Amplifiers & Preamps

1 Answer

Marantz PM-74D


Your no doubt finding the speaker safety/turn on surge protect relay NOT engaging a few seconds after turning it on-right? Check the output transistors. These are the big green and black ones screwed to the heatsink. You gain access to them by taking off the bottom cover. There's 4 per channel--2 green and 2 black. You'll probably find one or more of them shorted. If you find replacements, put them in exactly as the originals with new thermal grease/heatsink compound. Unsolder and lift the center pin (collector) on each of the four transistors of the effected channel. Power it up and check across the outside pins of each device for proper bias-about a half a volt or so on each one. If the voltage is much higher, or not there you've got other problems that will require more diagnostic/troubleshooting. Do all the lights on the front panel work-or just the tape monitor indicators? If just the tape monitors light up, check resistors RN83 and RN84 on main board under the speaker connector board-remove the speaker connector board to get at them. These are bad on mine and I've yet to replace them. I believe these to be 920 ohm 1% precision resistors....

May 17, 2008 | Marantz PM-68 Amplifier

1 Answer

Marantz pm 7200


Could be a power supply failure or a Power "On" switch failure.

Kev

Feb 23, 2008 | Marantz PM7200 2-Channel Amplifier

Not finding what you are looking for?
Amplifiers & Preamps Logo

Related Topics:

306 people viewed this question

Ask a Question

Usually answered in minutes!

Top Amplifiers & Preamps Experts

 Grubhead
Grubhead

Level 3 Expert

4590 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

The Knight
The Knight

Level 3 Expert

68301 Answers

Are you an Amplifier and Preamp Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...