I just snagged a 5900Di pro off ebay, not working or for parts 100.00 total. The guy says it doesn't power up. I have a good 4900Di pro. I have not gotten the 5900 yet, but I suspect that these will have the same board. Does anyone know (Karl?) I will be looking at the board in the 5900 as soon as it comes.
Given the design of the battery connector on the 4900, I'm betting that the 5900 battery connector is just not snugging up to the spring loaded contacts, and that
simply fixing that will fix the 5900, (the foam block on the battery compartment case might be gone) but if It doesn't, I'm going to have to try to repair it. My 4900
was missing the battery pack, so I made one, and used a pair of wires with a plug on it to connect the power to the 4900, and it works as well as a 4900 can possibly work.
I've picked up most of the schematics off the board, but while at least one claims to be a 5900, it appears that it really is a 6000.
Reading the 4900 Di pro manual, in the introduction by "Sierra", he states that Whites created the 4900 by removing the volume control from the 5900, and eliminating the meter circuit, and adding the 10 turn stacked manual ground balance pot.
Looking at the circuit board, you can see where the volume control was shorted out with a wire (which I have removed, and tried to install an external pot for volume control (which is not working quite right, it is a 50K). Looking at the schematic of what claims to be a 5900, it looks like the volume control is a 250 ohm. That doesn't make a lot of sense. You can also clearly see where the meter circuit was unpopulated
Additionally, on the 4900 board, there is a big honking coil that doesn't appear in what claims to be a 5900 schematic.
So:
I would like an official schematic for the 4900Dipro, and the 5900 Di pro.
Does anyone have one?
Cheers
Woody
Given the design of the battery connector on the 4900, I'm betting that the 5900 battery connector is just not snugging up to the spring loaded contacts, and that
simply fixing that will fix the 5900, (the foam block on the battery compartment case might be gone) but if It doesn't, I'm going to have to try to repair it. My 4900
was missing the battery pack, so I made one, and used a pair of wires with a plug on it to connect the power to the 4900, and it works as well as a 4900 can possibly work.
I've picked up most of the schematics off the board, but while at least one claims to be a 5900, it appears that it really is a 6000.
Reading the 4900 Di pro manual, in the introduction by "Sierra", he states that Whites created the 4900 by removing the volume control from the 5900, and eliminating the meter circuit, and adding the 10 turn stacked manual ground balance pot.
Looking at the circuit board, you can see where the volume control was shorted out with a wire (which I have removed, and tried to install an external pot for volume control (which is not working quite right, it is a 50K). Looking at the schematic of what claims to be a 5900, it looks like the volume control is a 250 ohm. That doesn't make a lot of sense. You can also clearly see where the meter circuit was unpopulated
Additionally, on the 4900 board, there is a big honking coil that doesn't appear in what claims to be a 5900 schematic.
So:
I would like an official schematic for the 4900Dipro, and the 5900 Di pro.
Does anyone have one?
Cheers
Woody
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