03-02-2015, 02:36 AM
Hi all. I'm not good with solid state items but I know several of you have great knowledge working on them.
I recently picked up a Marantz 2220B receiver that I'd like to use in my shop. It worked but had slight distortion when the volume was turned up. I decided to recap the unit and ordered all the caps. I ended up replacing all capacitors and the unit has much more power now but still has the distortion when turned up. The service manual mentioned setting the power supply voltage on 2 pins to 35VDC (at idle) by turning a pot on the supply board. I'm using a VTVM as they mentioned but I'm only getting just under 20 volts when the pot is maxed. At 20 volts the distortion is much better but I'm wondering what to look at next? Should I disconnect the load and measure the voltage?
I recently picked up a Marantz 2220B receiver that I'd like to use in my shop. It worked but had slight distortion when the volume was turned up. I decided to recap the unit and ordered all the caps. I ended up replacing all capacitors and the unit has much more power now but still has the distortion when turned up. The service manual mentioned setting the power supply voltage on 2 pins to 35VDC (at idle) by turning a pot on the supply board. I'm using a VTVM as they mentioned but I'm only getting just under 20 volts when the pot is maxed. At 20 volts the distortion is much better but I'm wondering what to look at next? Should I disconnect the load and measure the voltage?
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