Heathkit IO-4205 - Page 33

4-40 NUT
@__~
#4 LOCKWASHER
NOTE: Be sure to position the capacitors, installed in
the next two steps, exactly as they are shown in Picto-
rial1-17.
(..--1 / C1: Connect one lead of .1 J.LF Mylar capacitor
through connector J1 (S-2) to switch SW1A
through lug 1 (S-2) to lug 5 (S-1). Connect the
ther lead to switch SW1A lug 4 (S-1). Disre-
ard
the band on the capacitor.
C2: Connect one lead of a .1 J.LF Mylar capacitor
through connector J2 (S-2) to switch SW1B
through lug 5 (S-2) to lug 1 (S-1). Connect the
her lead to switch SW1B lug 8 (S-1). Disregard
e
band on the capacitor .
( efer
to Detail 1-17C and prethread the two
grooves in the bottom of both heat sinks. Use a
4 X3/8" screw.
Refer
to Detail 1-17C and install an MPSU10
transistor (#417-834)
on a heat sink with 4-40 x
1/4" hardware. Be
sure the beveled edges of the
transistor are positioned as shown. ·
Page
31
Detail 1-170
/
) In the same manner, install another MPSU10
transistor (#417-834) on a heat sink.
Q115:
Place a short ferrite bead on the center
lead of one of these transistors. Insert theE, B,
and C leads of the transistor into their corre-
sponding E, B, and C holes in the circuit board
at location Q115. Secure the heat sink to the
circuit board with two #4 x 3/8" screws. Then
solder the transistor leads to the foil and cut off
the excess lead lengths.
( ~ Q116: In the same manner , install the other
transistor and short ferrite bead at location
Q116 on the circuit board.
Refer to Detail 1-17D
and insert the tabs on the
circuit board shield into their circuit board
holes and push the shield down tight against
the printed side of the circuit board . Be sure the
flat 4-conductor cable is positioned as shown.
Then turn the circuit board over and solder the
shield tabs to the foil.