Panasonic NV-HS1000 PSU Recapping

[fuus12]

Hello all,

I have recently obtained an NV-HS1000 but it suffers from a common issue of no powering up and after being plugged in for 30 seconds or so the head starts spinning at maximum velocity.

Reading up on here this seems to be an issue with one of the low voltage rails out of the power supply and it's worth recapping it. I have removed the PSU from my unit and can see some discolouration to the PCB near the base of the large 68uF cap. Is this likely to be that cap leaking or something else nearby?

I'm afraid I don't have access to an ESR so I will just replace anything fishy.

In online service manuals for this unit the capacitor specs seem almost illegible - is there a clearer copy anywhere of the PSU schematic?

Any advice greatly appreciated.

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[aramkolt]

Not the same machine, but I've seen the max velocity thing happen with an AG1980 machine that I'd accidentally left one of the resistors disconnected on the drum drive circuit board. After re-soldering that, it did not cure the maximum velocity thing. I thought perhaps it would be the servo board and swapped one of those over from a working machine and that made no difference either. In short, I swapped everything including the power supply and I've narrowed it down to being a motherboard problem. But since this is so rare in AG1980's, I don't really have the time/expertise to chase down specifically what component is bad and I've got several spare working motherboards.

So in short, I'd say try to measure the voltages on your power supply first and see if they match what they should be in the service manual. You could also just blanket recap the power supply which I do anyway on AG1980's more for prophylactic purposes to future proof them, but I don't expect that to fix the maximum velocity head spinning thing, but you never know until you try. It's quite unlikley that the main filter cap is bad, so that one you can likely leave untouched if you do decide to recap the rest. On the AG1980, the maximum velocity doesn't start up until you try to put in a tape, not sure if that's the behavior you are seeing or not. The discoloration you are seeing is probably normal and is likely due to that big resistor leaching heat into the board there. A thermal camera would show you for sure.

[fuus12]

Hi aramkolt,

The head spinning happens without touching any button or attempting to put a tape in.

I got the idea from https://www.digitalfaq.com/forum/vcr...nv-hs1000.html which sounds like a similar issue. I can also hunt around for dry / suspect soldering joints and tarnished ribbon connectors

EDIT: Another example here and they don't seem to have gotten to the bottom of it https://www.digitalfaq.com/forum/vcr...nv-hs1000.html