Elma T310 - T780-T1060 H Components

How to replace components
on the generator print
© Elma GmbH & Co KG SM/Transsonic_LC/1104/D
81
15.4 T780 – T1060H
Units made since 1991 are fitted with transistors of the type
BUX48A.
The old BUS13A transistors in units made before 1997 can be
replaced by the new BUX48A.
In case of a short circuit of the transistors always replace both
transistors. The transistors must have the same amplification
factor, as otherwise the unequal charging of the transistors can
overheat and destroy them.
The transistors are preselected by Elma. Spare part deliveries
always contain transistors with equal amplification factor.
If the fuse on the generator print is blown check the
transducers..
200 000 5062
Transistors
Elma Order No.
1. Unscrew the transistors.
How to proceed
2. Unsolder and degrease the transistors.
3. Check the diodes BA159 for short circuits; replace both if
necessary.
4. Check resistances 100 Ohm and 0.47 Ohm for throughline;
replace if necessary.
5. Screw in the new transistors.
Caution: Check the insulating disk (A) for damage.
Remove dirt particles if any.
The flat side of the black insulating sleeve (B) for the screw
connection must lie on the cooling body as otherwise there
will be no connection between transistor housing (collector)
and generator print.
The washer is fitted outside.
6. Adjust the generator (see section 16.6.).
Correctly prepared
transisto
r
Illustration 15.4.1. Transistor with insulating disk and insulating sleeve
A
B
C