UNPLUG
ON
STANDBY
OFF
COOL
Preliminaries
Please make sure you do the following before opening your amp:
Unplug the power cord.
Turn the power switch off.
Turn the standby switch off (down position).
Give the power tubes 10 minutes to cool down.
Make sure the power tubes have cooled down enough to touch.
Remove all of the tubes from the amp and store them someplace safe.
Remove the amplifier chassis from its cabinet and set it on a safe workplace.
ON
STANDBY
When the amp is open:
Follow the one hand
rule and use a volt meter with
alligator clips to measure for
high voltage at several test
points.
The one hand rule
(pictured above): is a safety precaution for working on an amp that is
plugged in or could potentially have high voltages present. Using alligator clips with your
DMM, clip the ground side to the chassis and use the other side to probe at various test points
with one hand.
This prevents a fatal shock which can result from current passing through the
heart.
(Many people even put their other hand in their pocket or behind their back).
(test points are on the next page)
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