Heathkit IO-4205 - Page 49

Page 47
® ~ f¥f*SP#B*i?iJ
4-40 NUT
@_~
#4 LOCKWASHER
Detail 2-11B
( ~ onnect a 2-1/4" Brn wire from switch SW5
wafer E
lug 9 (S-1) to control R11 lug 3 (NS).
( v( Connect a 2" Brn wire from switch SW5 wafer E
/ lug 8 (S-1)
to control Rll lug 2 (NS) .
(/) Connect a 3-1/4" Brn wire from circuit board
) wleD9 (S-1) to switch SW5 waferD lug 5 (S-1).
( ~ Connect a 3-1/4" Brn wire from circuit board
j ole M (S-1) to switch SW5 wafer E lug 4 (S-1).
M Connect a 4-1/4" Brn wire from circuit board
holeD8 (S-1) to switch SW5 waferD lug 4 (S-1).
~~~ c; ./
_:;--- f/D \ "?
Refer to the inset drawing on Pictorial 2-11 for the
following steps.
( ) / Prepare a
3" and a 2" Brn wire.
[ <Vj' Connect a 3" Brn wire from circuit board hole J
(S-1) to control R11lug 2 (S-2).
( ~ Connect a 2" Brn wire from circuit board hole I
(S-1)
to control R11 lug 3 (S-2).
R12:
Connect a 1000 0, 1/2-watt (Brn-Blk-Red)
resistor from
switch SW5 wafer E lug 5 (S-1) to
control Rll lug 1 (S-1). Use a 5/8" length of
sleeving
on each lead.
( 4 Refer to Detail 2-11B and prethread the two
grooves in the bottom of both heat sinks. Use a
#4 X 3/8" screw.
( )V
Refer to Detail 2-11B 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.
In the same manner, install another MPSU10
transistor (#417-834)
on a hea:t sink.
Q215: 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 holes in the circuit board at location
Q215. 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 .
Q214:
In the same manner , install the other
transistor and a short ferrite bead at Iscation
Q21!
on the circuit board.