500V
!
Insulation test
>50 MΩ
*
*
500V
!
6 µF
0
∞
Ω
∞
0 Ω
0
∞
Ω
*
*
1 sec.
230V 160Watt
±8 Ω
Page 42
ELECTRICAL TESTS
Service Manual LDR 8s AC
PKII
form 9120934 rev. 02/2022
The 6µF capacitor
General
Even with a capacitance meter it is impossible to
determine for sure if the capacitor is ok or not,
because it can be leaking when it is connected to
mains power.
A quick optical check often tells more. Search for
leaking oil and / or bulges (lumps).
Measuring with an insulation tester
in 500V po-
sition.
Work under safe conditions according local legis-
lation!
The value will not reach ∞ Ω, but will go up and
down a little. When it is above 50MΩ it wil be ok.
Disconnect the test leads while the value is at the
highest position. The capacitor is now charged
with ± 500VDC!!
Leave it for a few seconds and then put the wires
together. A loud spark must arise. If not, the ca-
pacitor is leaking (loosing its charge).
It is also possible to charge the capacitor
by
shortly con necting it to the mains supply
(208V~). The same spark must arise. Do this a few
times. The capacitor will not
be charged when the leads are disconnected du-
ring the “zero crossing” of the mains sinus. It is
ok when a spark arises once.
Measuring with an Ω meter
.
Be sure that the capacitor is empty!
The value will go up until ∞ Ω is reached.
Exchange the test leads. The value will go down,
through “0” and up again.
If not, the capacitor is broken.
If ok, it is still not sure if the capacitor is ok. It
might leak when it is connected to the mains
power!
Charging with a test cable
Checking with Ω meter
MEASURING THE 160W LAMP
