marantz pm66se balance pot
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by sretchkoHey fellow solder fume lovers, I have a Vintage Sony Receiver STR-4800 SD that has me stumped.
The Balance Pot has to be set at about 30 degrees (11 o'clock) to the left for the output to be balanced (see photo). I'm using an oscope, sig gen 1kHz sine, 8 ohm dummy load).
When output is balanced (11 o'clock left) both channels clip at about 19 vac / 45 watts RMS, Amp is rated at 35 watts so I know the amp modules are good. Square wave also looks good when turning bass & treble pots and is in phase.
I pulled the balance pot, (Dual 10K MN Taper) cleaned with...Badcaps Electronics Repair Forum & Schematic Search-
Channel: Troubleshooting Audio Equipment
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by acedogblastFirst off I would like to thank this community as it has provided me with great information that has helped me greatly on my repair for this Marantz SR5012 AV receiver. I am creating this new thread as the other 2 that I have created here has had their original question/problem solved and I plan that this is the final thread on my repair. Please note that this is my first time repairing audio amplifiers so I may not be aware of common issues and things to know.
Lets start at what I have done so far. Random speaker popping on all channels is fixed by replacing the 2 large filter...-
Channel: Troubleshooting Audio Equipment
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by Mark RI am not ashamed to say this is my first FM alignment I have ever done. I am well versed in electronics and repair. Been doing it for many years on Pro Audio Live sound equipment. Worked on Power amps EQ's musical gear and Large format Mixing Live consoles Etc. But now I can see this is a whole different world when it comes to tweaking this kind of gear. I do have the proper gear like the SENCORE SG 80 and HP Generators and Scopes Etc.
Look below at Adjustment 12:8. The Null adjustment. I have a Heathkit IM-28 VTVM that was rebuilt and has new Burned in tubes that I used for this...-
Channel: Troubleshooting Audio Equipment
12-30-2024, 03:18 PM -
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by BigOofHi,
I bought a used Marantz SR5007 and it's giving me some issues that I can't seem to really place. It functions well in most settings, ARC mostly works, it has no issues driving my speakers in any of the digital input modes, but I'm having issues running analog inputs in direct or pure direct mode. For some reason in this mode there's distortion for every volume increment I give it, but once the volume is stable it has no issues. Muting creates a loud pop, switching to another source also causes a pop and so does turning off the amp in that mode. Again, no issue in the digital modes....-
Channel: Troubleshooting Audio Equipment
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by oshimapthello guys,
first of all i'm not a qualified repair guy, i am a diy guy and as years pass by i have some experience on repairing eletronics, and i'm hoping someone can share their experience.
i have a marantz sr6012, some times it turns on and works normal, but after a while the sound cuts off or it starts getting distorted and then cuts off.
when this happens there is no audio no matter the source used, and the OSD shows unknow audio signal from the source.
i was reading very carefuly the service manual and it is all pointing for...-
Channel: Troubleshooting Audio Equipment
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