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]

Re: Warning Mp C8002 PSU electrocuted (almost)

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]

Re: Warning Mp C8002 PSU electrocuted (almost)

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]

Re: Warning Mp C8002 PSU electrocuted (almost)

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]

Re: Warning Mp C8002 PSU electrocuted (almost)

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]

Re: Warning Mp C8002 PSU electrocuted (almost)

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]

Re: Warning Mp C8002 PSU electrocuted (almost)

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

[NeoMatrix]

Re: Warning Mp C8002 PSU electrocuted (almost)

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]

Re: Warning Mp C8002 PSU electrocuted (almost)

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]

Re: Warning Mp C8002 PSU electrocuted (almost)

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

[slimslob]

Re: Warning Mp C8002 PSU electrocuted (almost)

I remember my high school auto shop class. It had a spark plug tester. The boot over the connector that connected to the spark plug had a pin hole in it. If your finger was near the piun hole when you pressed the test button it gave you a good wake up jolt.

Another is to make a "Hot Seat'. Take to pieces of copper screening and attach them to the top of a wooden stool leaving about a half inch gap between. Connect the pieces of screen to a Model A ignition coil. Cover the screen with felt. Have someone seat on the stool ans when they say the wrong, press the button to turn on the ignition coil.

[NeoMatrix]

Re: Warning Mp C8002 PSU electrocuted (almost)

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

Electric shock frequency generator is a quick easy way to clean parasites from your body. The electrical zapping techniques are by no means new to people, they go back thousands of years.
I believe it was first used by the Myan an Incas who made the first batteries from clay pots copper coils and citris juice.
There are Ancient cultures that used clay pot batteries as far back as 200 BC

I use a frequency zapper quite often. If I have a back pain or bruise muscle, I stimulate that target area with electrical pulses.
You don't need a lot of current or voltage to get relief.
It works quite fine. I usually feel better the next day. If I want to clean out parasites I run 20 mins on and off in 3 cycles.
No more feeling hungry or itchy backside. There you have it straight to the point. Simple as it gets.

[Tonerbomb]

Re: Warning Mp C8002 PSU electrocuted (almost)

I remember my high school auto shop class. It had a spark plug tester. The boot over the connector that connected to the spark plug had a pin hole in it. If your finger was near the piun hole when you pressed the test button it gave you a good wake up jolt.

Another is to make a "Hot Seat'. Take to pieces of copper screening and attach them to the top of a wooden stool leaving about a half inch gap between. Connect the pieces of screen to a Model A ignition coil. Cover the screen with felt. Have someone seat on the stool ans when they say the wrong, press the button to turn on the ignition coil.

Back in high school, we took the electronics instructor to task. WE ran a wire from 1 spark plug in the passenger door to the drivers seat. He drove a little datson with metal door handles. When he turned the key he got shocked. Then he tried to start the car again and it ran on 3 cylinders and he got shocked by anything he touched...............

Then there was the time I was working on an old ricoh FT4060, with the door cheated I flipped the TS corona down and my finger hit the sep wire. Put me back about 3 feet on my ass....................

[NeoMatrix]

Re: Warning Mp C8002 PSU electrocuted (almost)

Back in high school, we took the electronics instructor to task. WE ran a wire from 1 spark plug in the passenger door to the drivers seat. He drove a little datson with metal door handles. When he turned the key he got shocked. Then he tried to start the car again and it ran on 3 cylinders and he got shocked by anything he touched...............

Then there was the time I was working on an old ricoh FT4060, with the door cheated I flipped the TS corona down and my finger hit the sep wire. Put me back about 3 feet on my ass....................

When we were young my brother an I would play around with an old army field marshal telephone. Put your fingers on the two wire terminals and wind the handle of the phone. It felt like someone was shaking your brain from the inside.

We also played around with mustang fighter plane ignition generator. Holly crap could they kick with just a half turn.

[bobbykerr]

Re: Warning Mp C8002 PSU electrocuted (almost)

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.

Hi johnyb

can I just confirm that in stage 3 you press the soft switch with the m/c still unplugged ???? Thanks in advance

bobbykerr