20 Most Recent Marantz SR5001 - Page 8 Questions & Answers

http://irebuildmarantz.com/catalog/product_info.php?products_id=34 The symptom you describe could be a failing filter capacitor. It appears to be a common problem with this unit. The above link is a source of replacement parts, and or assistance in getting it repaired. Increasing the volume increases the voltage in the amplifier output circuits, which increases the stress on the filter capacitors. If one is breaking down it could cause a harmonic oscillation that would be a whistle. Hope that helps.

Thermal cutoff is operating. There is excessive heat being generated on the heat sinks of the Amp. This happens when there is a shorted output transistor or a speaker load changing.

hi charlie. not sure if this link will help you out,or you could try ebay. replacement volume control rm0254022 for marantz 2250b Google Search

There are 2 causes of the problem that you describe. One is the input signal is too high and is over driving the amp. The other is the output impedance is dropping due to short circuit etc. There is no adjustment on the protection circuit. It is possible that a weak sensor is present or a bad transistor etc, but you need special equipment to check that. http://www.eserviceinfo.com/downloadsm/40697/Marantz_SR4200.html

If it is a twist type knob that regulates the volume control they can often brake so you will need to take it off to inspect it you can do this by pulling it directly towards you ( a small screw driver placed behind it can help to get it off ) then you will be able to check to see if it is broken or not or if you can then control the volume by turning the shaft that the knob was meant to be attached to , a small amount of epoxy glue should fix the knob back onto the shaft if this is the problem .

Try download music songs and try again.

It could be a burned out resistor in the main power amp. Follow the channel wires from the speaker that is playing up till you get to the power amp. Look around for anything odd. Compare it with the other channels, as they are good.

Hi. It's nearly four months since you posted this I know. But ive only just seen it. Just wondering if you've got it sorted ?

Player cannot focus on disk and is no good. Replace

Use on the control buttons and other switches balance contact spray as the first step let it work for a few minutes. Control the print for some loose components (solderings) by carefully some manipulation and movement on print and components with a wooden or plastic object, because solderings on active heat-conducting components have allways high priority on the end stage, and in power supply primary you can become early loose components in the solderings if the manufacturer has used leadfree solder. If you have after this no improvement then ALLWAYS refer the damaged to find components replace always twice (on both sides) each other replace if a damaged deformed capacitor or diode was found both as well left as right the same brand components , be carefull in replacements its very important because of in most repairs refurbishing for tonal influences Passive components as example (only suggestion) to take a capacitor 10Volt 330 MF then replace it for a 16 volt 330 mf the size should in most case be the same of the component its very important for tonal effects and balance, in most repairs is that more size format on capacity sounds better as the new order components become smaller on the same voltage its better to get the higher voltage capacitors with the same size as the old lower voltage ones. http://akdatabase.org/AKview/albums/userpics/.../Marantz%20PM6010F%20Service.pdf

Yes you can still get parts for these. You will however need to know about rebuilding electronics. Be able to read schematics and have to tools necessary to perform testing circuits. I have rebuilt many Marantz vintage receivers as well as Pioneer, Sansui, McIntosh and so on. Keep the unit alive. Don't toss it. If you cant work on it yourself find someone who can and if you can. If you can afford the cost of repair donate it to someone who has a passion for rebuilding these and keeping them in circulation. These are very nice sounding units once you get them serviced and up and running.

Check to see if the preamp section is working so as to isolate the source of the anomaly.