- Resistor not the same as schematic - 2 Updates
| Trevor Wilson <trevor@rageaudio.com.au>: Nov 30 07:07AM +1100 > This appears to be the only voltage source to this board..... > Any ideas or suggestions? > Thanks **R601 is a 220 Ohm 0.5 Watt resistor. That is what is indicated on the schematic from Hi Fi Engine. As others have stated, you need to use your noggin when fault-finding. For a 100k, 0.5 Watt resistor to show signs of stress (not burning) it would need to dissipate at least 0.5 Watt. That would suggest a Voltage drop in the order of 250 VDC across the resistor. Do you see 250VDC anywhere in that amp? -- Trevor Wilson www.rageaudio.com.au |
| Jeff Urban <jurb6006@gmail.com>: Nov 29 11:19PM -0800 Another thing is they could have used a one ohm, or just nothing. But that resistor is actually not a fusible, it is a decoupling resistor. Look at test instruments, they will have 12V and 12VDCPL that only means there is a coil or resistor on there to isolate DCPL from ripple on the line, high or low frequency, DCPL means decoupled. Most of them you can actually just jump out, but at 220 ohms it was probably meant to drop a few volts. But don't jump it out permanently. Just jump it out and see if anything smokes or gets hot, if so that is usually the fault. If not then the resistor just went bad. It happens. |
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