Question about Marantz Audio Players & Recorders
Found no shorted diodes or transistors on power supply board,could it be the TOP258MG IC?
Posted by Anonymous on
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
you can check the output transistors for short circuits with the low ohms range or diode checker . If they have failed, then it is often a good idea to replace all as much stress can be placed on an output array in this type of failure. to repair reliable, all outputs on an offending channel should be replaced.
Make sure the fuse you replaced was the same type of fuse. check markings.... T stands for sloblo... a fast blo duse may let go at turn on. The power supply may have a shorted rectifier diode in it also.
be aware however, every time a fuse of that rating blows... more damage may be occurring to the amp.
Posted on Dec 15, 2007
SOURCE: Stopped working
I had a similar problem with a jvc 8040. when I replaced the fuse it became very obvious that the b1560 output on the center channel was blown (smoke and sparks, always a dead giveaway). I haven't fixed the center channel yet but simply unplugged the center channel board and removed it from the unit. Now everything works fine except of course the center channel. Pre outs still operate just fine so a slave amp could be used for center channel power, or you could just go and buy a marantz amp; I did and then I realized that I was lucky that the old jvc quit.
Posted on Jan 30, 2008
SOURCE: Denon AVR-3105 Unit tries to
Look for open resistors in the same area. Also, if the transistors that you replaced are the output transistors, you should replace their compliments as well. I don't have the service manual with me at the moment, so I'm juist giving you generalities. If you can, lift the center pin of the output transistors and measure (and post) the voltage readings on each of three pads for each transistor. That should give me enough info to guide you further.
Posted on Oct 07, 2008
SOURCE: sansui amp au11000
Check for open resitors (All Values)..also make sure that any diode stacks (Varistors) are not open or shorted....mostly make sure you have replaced the BIAS POT! Lastly U could check for open traces and bad solder joints..also look for tiny solder bridges under an eyeloop magnifier on foil side of PCB>especially after replacing multiple components.
Posted on Jan 16, 2009
Can you check the power transformer, voltage & resistance.
You may have to unsolder some components to test them...such as the rectifying diodes and the transformer. I believe that the outputs from the power supply board are all DC voltages. Is there all so a IC chip on the power supply board? Does your insurance cover lightening damage?
Posted on Mar 25, 2009
Tips for a great answer:
Aug 16, 2016 | Sanyo Televison & Video
May 08, 2014 | Marantz SR5007
Sep 07, 2012 | Televison & Video
Aug 16, 2012 | Denon AVR-4806 Receiver
Sep 21, 2017 | Toshiba 55ZV650U 55 in. LCD HDTV
Here are some basic steps that will help you fixing the problem.
I'm assuming that your unit is dead set without an standby LED
light and your outlet is live.1.Power cord - check the cord it might be opened (no
continuity).This is due to frequent bending,pulling. 2. Power switch - check for dry joints, open contact. 3.Check the internal fuse-
sometimes the fuse fail because of the power
surge, replacing with new one will cure the problem, If this is the case I
would advice you to use surge protector/AVR (Automatic Voltage Regulator).
However if the fuse blew again this is an indication that you have a shorted parts in the power supply, you may visit the
linkhttp://www.fixya.com/support/r8053361-fuse_keeps_blowing for more info. If no reaction and
still the unit didn't power up then you have an open parts on the power supply.
4.If you see that the fuse is intact , don't attempt to touch anything
because there some fatalcomponents
stored electricity enough to hurt you with a simple mistake only. I would
advice you to look for a
professional to troubleshoot
the power supply. If you want to repair it yourself make sure that you have
necessary tools and test
instrument. First check bad solder joints(re-solder all
cold solder), leaky
electrolytic capacitor(sometimes it has bulged at the top but not all, you better
have a capacitor checker), open/shorted regulator transistor/IC(mounted in heat
sink), open fusible resistor (caused by shorted regulator
Transistor/IC), shorted zener
You may also replace the entire power supply board, click this LINK.
Hope I helped you.
Thanks for using fixya.
Jun 04, 2011 | LG 32LG30 32 in. LCD HDTV
Oct 01, 2009 | Televison & Video
Dec 11, 2007 | Kenwood VR-407 Receiver
36 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: