Marantz SR-18EX Repair Brief

The Multimeter Junkie repairs a Marantz SR-18EX

Category:

Science & Technology

Tags:

• Multimeter
• Junkie
• SR
• 18EX
• Repair
• Brief

[ducklandwikeno]

I have a question for you . To get the the lower board , the audio input selector board PS04 . I need to change a cap 823 2200UF16V . I was hearing from a guy on the website audiokarma . that This cap is for VL 5V supply circuit . That why My Receiver wont turn on right . He said its a bear to just get to that cap on that board . email me back for a response . I posted once before , but you were unsure if my receiver was broke .

[mdzacharias]

@ducklandwikeno You have to remove the back panel, and the screws at the corners of the stacked horizontal boards. The boards can sort of flip up like you see in the video. Don't trust what the other guy said though. You really need to do your own troubleshooting. It would be a shame to go to all the trouble of replacing that cap and find out that it was not your problem after all.

[mdzacharias]

@ducklandwikeno The receiver malfunctioned again after about a year. Originally I had lifted the ground leg of the regulator and added a diode to get .6 volt more. Worked OK, but it turns out there was a funky 10uf cap at the output of the regulator, and it was OSCILLATING with a waveform visible at it's output on a scope. Replaced the cap, removed my diode mod, and the reset is now perfect, and the regulator output also. (November 2011)

[PsychPresentations]

How much would the repair have cost if it was simply the bad IC not giving out the right amount of voltage to power up the receiver? I'm having the same problem and am curious how much they're going to charge me. Should I hold onto this unit once it's fixed or are these not very reliable?

[mdzacharias]

@PsychPresentations When you say "same problem" do you mean the small relay clicking or totally dead? In my case it still would be up to 300.00 or so because of the troubleshooting and major dissassembly. Don't forget the molex connectors on the amp module MUST be resoldered, that's a big job, and the backup cap is most always bad - that's about 40.00 with freight for the part and again major labor to replace. Even still it's a great receiver and worth fixing unless you "GOTTA" have HDMI.

[PsychPresentations]

@mdzacharias wow! Thanks for the fast reply, much appreciated. I mean the relay clicking. And 300.00 total for parts and resoldering of molex connectors and replacement of the backup cap? Additionally, what makes the backup cap so costly? Excellent channel and video by the way.

[mdzacharias]

@PsychPresentations I know it seems like a LOT to fix this thing,but they are just big,monstrous receivers that take hours and more hours to troubleshoot and fix. Just the dis-assembly alone is a really big deal, and there are two or three separate major dis-assemblies involved here. The backup is special, available only from Marantz, and it costs me somewhere around 30.00 plus - it's been a while so I don't remember exactly. Then there's unpacking, repacking, UPS charges, etc. It's a big deal.

[sjdemark]

I have repaired several Marantz SR 18s and an SR 14. All had the same issue with a blown amp channel and the problem was always on the top board and was caused by bad solder joints at the connectors. My approach for these is if the output transistors are shorted for a channel, I will simply replace every transistor and the white emitter resistor. Then compare the resistor values between the bad channel and a good one and replace as necessary. There are usually some fusible resistors that ar

[ducklandwikeno]

also I want to point out if i try to power it on from the remote control the receiver will go dead . The stand by light will also go dead too . This was not the way it should work . After Marantz it worked fine . But after 6 months or so I experienced the problem lIke Im explaining to you . So I think it back to the repair shop when I have the money to fix it . I will spend the money on , this receiver sound great too me .

[ducklandwikeno]

well I can turn it off from the remote fine but . If I first power it up and push the main power button it will not turn on right , But it I turn the Function Knob and press the main power button two time it comes on fine and plays . I had the main power supply fixed a year ago my marantz not under warranty . I think it got the same problem again with the main power supply not working right .