AML ez1081pre, Assembly Manual

Page: 27 / 43

Power Transistors (Part 2)
HS1 = Heatsink
+ 2 x M3 plain washers
Q13 = BD139 Transistor (1)
Tack in place first then check
they are vertical before
soldering completely.
Check Vertical
Tack in place.
2 4 3
Solder fully
Install the BD139 on the left side of the
heatsink in position Q13, and the BD140
on the right side of the heatsink in position Q14,
(with their rear sides towards the heatsink)
and a TO220 insulator behind each
device. Secure in place with an
M3 x 12mm screw and Nyloc nut.
Trim transistor legs and then solder in
place.
4
5
6
BD139
Insert heatsink through
M3 washers and
then into main PCB
1
M3 plain washers
Front
View
Rear
View
BD139
Q14 = BD140 Transistor (1)
BD140
+ TO220 insulator
(bush not required) + TO220 insulator
(bush not required)
M3
Nyloc.
BD139
TO220
Insulators
M3 x 12mm
BD140