In article ,
wrote:
In article ,
(Levent) wrote:
Folks,
I just buy a used AL-80A. It is set on 120 V and without connecting
any rig i did connec to gnd and 120. When I turned on I am seeing then
HV is 2400V. AL80A manual is saying that no load must show 3100V. Is
this mean that I need a new 3-500Z or can be something else.
Thanks for the help.
Levent WW2L
Check the HV meter resistors. They've been known to change value.
73
Dale, K9VUJ
A you don't have to have the power on to check the meter resistors.
Find them on the wiring diagram and lift one lead from the board then
using an ohm meter check and compare values with the schematic. If
memory is right it is a one percent resistor and one megohm. Might be
two though. You should be seeing around 3100 --3200 volts no load on
the HV meter, it will drop to perhaps 2800--2700 under load.
Be sure you have the power plug unplugged from the mains and wait at
least 30 minutes for the caps to discharge (NEVER TRUST BLEEDER
RESISTORS!!) then using a chicken stick to ground touch the capacitors
positive terminal to be sure there is no HV floating.
You're a ham and familar with all this stuff right?
If you're not sure about it, don't.
No joking matter 3 Kv is a killer!!! So No power on while you work on
it, Ok?
Dale, K9VUJ
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