ALPHA 22.
POWER TRANSISTORS
MOUNTING ASSEMBLY
0727 250882
(P#5131195)
0729 258772
(P'
12051
0731 25C2565
(P#5121275)
HEAT SINK
MICA INSULATOR
Figure 9
NOTE: For best heat conduction
, use thermally conduc-
tive silicon grease
betw~en the power transistor
and the mica insulator
and between the insulator
and the heat sink,
PRECAUTIONS FOR REPAIR SERVICE
Many of these
items are included just as a reminder
they are normal procedures
for experienced
technicians.
Short-cuts can be taken: but
, often they cause additional
damage to transistors
, circuit components or the printed
circuit board,
Replacements for output and
driver transistors
, if
necessary, must be made from the same
hfe group
as the original type.
Be sure to
include this infor-
mation when ordering replacement transistors,
If one output
transistor burns out
(open or shorts),
always remove all output transistors in that channel
and check the bias adjustment
, the control and other
parts in the network with an
ohmmeter before insert-
ing a new transistor, All output transistors in one
channel will be destroyed if the base biasing circuit is
open in the emitter end.
Do not
bridge electrolytic capacitors with AC power,
The resultant surges may damage solid state
devices.
Do not
bias the base of any transistor while voltage
is being applied to its collector.
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