16.004 How do I discharge the High Voltage?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
16.004 How do I discharge the High Voltage?
The HV charge (20,000+ volts) might not be much reduced by just waiting a few
hours (or days), especially if you are in a low humidity location and the tube,
etc., are of good quality. You can, probably, reduce the shock hazard by
discharging the High Voltage at the anode. You can not, really, expect to
eliminate the shock hazard. (See WARNING below.)
1. There is a long wire (called the anode) that goes from the high
voltage power supply to the top of the tube where it is snapped
into a hole. You can't see the hole because there is a rubber
shield built onto the wire. The end of the wire goes to a metal
clip which, without the rubber shield, looks somewhat as below.
One squeezes the clip so the end slips into the hole in the tube.
--- ---
== \ / ===== back of CRT
\ / <-- metal clip (This is what your grounded
| screwdriver needs to touch.)
[|]
[|] insulated Anode lead going to HV module
[|]
Needless to say, UNPLUG the monitor before beginning. Simply
turning it off isn't good enough.
2. Get a clip lead and clip one end to a long slender screwdriver
3. Clip the other end to the metal chassis of the TV (i.e the
metal frame parts)
4. Carefully! slip the screwdriver tip under the rubber flap on the
top of the tube until it touches the internal wire that both
holds the anode wire in place and conducts electricity.
Step 4 may result in a somewhat loud "SNAP" as the tube is discharged. Be
prepared so you don't jump and break something.
WARNING: After "discharging", do not assume that no High Voltage is present.
Almost certainly, some High Voltage remains or may reappear over time.
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