Several times now we had discussions about how to discharge the photo-flash-capacitor of a DSLR body when one for example needs to replace the solenoid.
1. Pentax bodies with pop-up flash
which will open without the battery inside the camera:
K10D, K20D, K7, K5 series, K3, KP, K1 (Samsung GX10/GX20)
K-30, K-50, K-500, K-S1, K-S2, K-70
2. Pentax bodies with pop-up flash which will open
only with batteries inside the camera and only if
SWITCHED ON:
*ist DS/DL (Samsung GX1/2), K100D, K110D, K200D, K-01 (!), K-m, K-x, K-r
If you can't open the pop-up flash on any of those which sometimes happens for example if battery contacts are damaged, then there is a manual option to open the flash: Facing the K-bajonett away from you you slide something very thin but stable (I use a scalpel) from the front underneath the right side of the flash until you can feel the resistance of
THIS LEVER which locks the flash. Push this lever backwards and the flash pops open. If the capacitor of any of those Pentax bodies is still charged, you discharge it
as shown here 1.st option for discharging the flash-condensor: - Set your Pentax in the menu C-3-16 (K30/K50): Shutter Release while charging flash: Set it on 2 (yes) - Set to M-Mode and time to 1/200 seconds + flash popped up/open - set your camera for serial-photos!
- take a series of photos and then immediately switch the camera off!
- Right after this the voltage is yet a bit too high but no longer really critical to a healthy person: I measured 126V/DC! - But after 24 hours the voltage will has dropped down to absolutly uncritical 26 Volts (also uncritical to those with medical issues!) and after 48hours later to almost 0V/DC
But also if you don't want to wait and work right away, you need to know how to discharge the condenser properly:
2.nd option for discharging the flash-condensor: (You can start with OPTION #1 but you don't have to!)
The
PLUS (
+) contacts of the capacitor of the K30/50/500 are to be found here:
Because I have replaced now so many solenoids and anyway play safe, I built myself a little device which allows me very quickly to discharge this capacitor:
I use a 60W/240V standard lightbulb (so the old type with filament, no LED's etc!)
A resistor 10W and value 1-1,6 kohms/10W will do the same but you can't see the discharge!
You can solder wires directly onto the lightbulb as well or use a lampsocket.
I find that this strong short illumination is very useful, I know for sure, the capacitor is discharged!
One could also use a Voltmeter, but it has to be the oldfashioned type with a needle and yet it will take quite a while until the cap is discharged!
It is important to find out the
positive=plus-pole of the capacitor because touching this one and the metal of the k-mount
(which is minus/-) of your body is sufficient, here shown on a K-500:
Capacitors have their
minus (-) pole marked
with a long stribe along one side The capacitor of the K-30, K-50 and K-500 have the
plus-pole towards the front (K-mount side)!
The lightbulb illuminates quite strongly when you discharge it
(mine is protected against shock because I use it regular):
There have been few times when I believed the photoflash-capacitor should be discharged. The shock then is quite a surprise, not dangerous to a healthy person but quite unpleasant. And you risk this danger that while unscrewing or soldering the solenoid you get the shock, slip off with the tool or soldering-iron and do some serious damage.
There are capacitors which are difficult to reach, for example K-S1, K-S2 and K70. But with those you use
OPTION #1