Warning Mp C8002 PSU electrocuted (almost)

[Zaxxon]

Be aware of the correct shutting down procedure before putting your hands on the PSU. I Didn't and when reaching for the PSU I've got a HUGE electrical shock... Well I didn't die obviously but it hurt and I was shocked.

Today a week later I would take a look on the old PSU, wanted to desolder some nice big capacitors. BANG! I was hit once more by the evil PSU, still going strong a week after it was pulled from machine. I got so surprised that I dropped it on the floor and the board broke. With my multimeter i could measure 309 volt. DC...

The stupidity will not end, I've devided to decharge the evil bastard with a pair of scissors. (Ok i know, not wise) a huge spark flew with a loud bang!!! I am finished with it now

[banginbishop]

There is a correct way to discharge them and it's not sticking a screwdriver across them for anyone who says so. I know there is a way to turn it off on the smaller mpc range after you turn it off but not sure on the mpc8002.

ill have a look on how to discharge them safely - and Yep it's not fun when you get a buzz from a psu!

[NeoMatrix]

There is a correct way to discharge them and it's not sticking a screwdriver across them for anyone who says so. I know there is a way to turn it off on the smaller mpc range after you turn it off but not sure on the mpc8002.

ill have a look on how to discharge them safely - and Yep it's not fun when you get a buzz from a psu!

With a 10k 1/2 watt resistor. Dead short it across the terminals. Make sure you power off the machine or disconnect the PCB first. Most HV caps have a built in resistor for this exact reason.

[johnyb]

The correct shutting down procedure on a MPC 8002 is ...

1. Power off with soft switch.
2. Unplug.
3. Power on with soft switch. (the machine will discharge the PSU).

You can also discharge a capacitor (If you must) with a pair of needle nose (insulated) pliers, terminal to terminal.

[skynetto]

Best way to discharge a capacitor is to connect a 100watt bulb in it. The bulb will bright and slowly dim off. Than you can operate on the power supply safely.

[slimslob]

With a 10k 1/2 watt resistor. Dead short it across the terminals. Make sure you power off the machine or disconnect the PCB first. Most HV caps have a built in resistor for this exact reason.

You beat me to it Neo.

[Tonerbomb]

Reminds me of the early Batman comics, ZAP, POW, BANG...............OUCH!!!!!!!!!

[NeoMatrix]

Reminds me of the early Batman comics, ZAP, POW, BANG...............OUCH!!!!!!!!!

You forget the growlics #$!*% text.....

I use to read Phantom comics as a kid. My granma would send me to the comic exchange store to swap her Phantom comics with the next series, an I would read them on the way home.... Long time ago....

[Zaxxon]

The correct shutting down procedure on a MPC 8002 is ...

1. Power off with soft switch.
2. Unplug.
3. Power on with soft switch. (the machine will discharge the PSU).

You can also discharge a capacitor (If you must) with a pair of needle nose (insulated) pliers, terminal to terminal.

I wouldn't put any metal on this evil piece of electronics, the scissors I used got ruined tip, high power, zzzzap

[ewizzy]

I think I must be a bit weird.......

I quite like an electric shock, makes me feel a bit wibbly wobbly and puts a grin on my face. I used to love working on the old analogue Harris 3M copiers etc that a switched on the negative side. Always used to get a bolt when cleaning the optics (lamp is always live even when front door is open and clam shell opened) and working on fusers too..... accidentally touching the live terminals.

Health and safety rules put a stop to that business though

Shocking news Mwahahaha