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p750

  1. vferdman

    Need help with 2230 Amp board (P750) troubleshooting

    Hi, there. I have a 2230 on the bench that has a bad right channel power amp board. I have isolated the problem to it by injecting a 1kHz tone into the AMP IN terminals on the back. Left channel is fine and delivers about 35+ Watts of power on said test signal. Right channel is clipping the top...
  2. P

    Marantz 2245 p750 Board Help

    I could use some help with my amp rebuild and troubleshooting. I have a Marantz 2245 Serial Number 31730. recently I've noticed diminished audio quality on the right side. I've been able to determine it is the p750 board. For background I've used the rebuild kits from peace.love.and.music...
  3. kasbah512

    2245: -35v DC at output

    So after resolving some other issues, I'm now seeing -35V at J756. Here's the components I've tested so far and they all are functioning correctly: H002, H751, H752, H753, H755, H757, H759, H760, H761, H767 I'm not really sure where else to look, or if i should even bother checking the + side. I...
  4. jFF_Bulbo

    MARANTZ 2230 power amp. PLEASE.help.

    Hello AK'ers. I´ve been working on a recap on my 2230. i finished the recap according the suggestions here, in AK. main caps are new.... output transistors...... voltaje on P800 PS board are correct: 13.8v on j805 and 35.6v on j808. P750 has new: -electrolitic caps part-------original-----sub...
  5. R Krawczyk

    Marantz 2270 P750 Replica Board

    Hi All! This is a followup post from a few years ago regarding the work that AK member ton4eff did in producing a replica board for the Marantz 2245/2270 P750 amp boards. You can reference the original post here...
    • R Krawczyk
    • Thread
    • 2245/2270 replica amp board 2270 marantz marantz 2270 p750 p750 p750 replica
    • Replies: 37
    • Forum: Marantz Audio
  6. bibota

    Changing 2230 trimmers

    R765 trimmer behaving unreasonably while being adjusted did quite some damage on my right P750. I intend to replace all pots now. Not at all sure about the power rating though, in the specifications are all marked as "B". Any advice please? This series available at Digikey seems to be...
    • bibota
    • Thread
    • bias dc current p750 pots r765 trimmers
    • Replies: 6
    • Forum: Marantz Audio
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