Heathkit IG-18 - Power Supply Circuit Board Assembly

Page 12
STEP-BY-STEP ASSEMBLY
CIRCUIT BOARD MOUNTING AND ASSEMBL Y
Detail 6B
( ) Refer
four
ers,
6B.
Perform
Detail 6A
Detail 6A and fasten the power
circuit board to the chaSSis. Use
x
3/8" screws, four #61ockwash-
four 6-32 nuts as shown in Detail
steps on Pictorial 6.
START
..
47 r;z (yellow-violet-black).
) 2400 (red-Yellow-red).
) Install 40389 transistor(#417-
178 QI0. The collector (C)
and emitter (E) leads are on
either side of the wide space,
Line each lead with the cor-
rect and position the tran-
sistor the circuit board,
ID:tE~
SPAC~
..
.......
C\~E
:-:.: ;.;. ....... .
c B
) Solder all the leads to the foil
and cut off the excess lead
lengths.
PICTORIAL 6
CONTINUE
o
NOTE: When installing diodes, the
cathode end must be positioned as
shown on the circuit board. The ca-
thode end is marked with either a
color end, color dot, color band, or
a symbol.
COLOR
~
001
~
SYMBOL
(CATHODE
~
COLOR
BAND
~
Silicon diode (#57-65) at D5,
Silicon diode (#57-65) at D6.
Zener diode VR 43 (#56-66)
at D7.
)
50 /IF tubular capacitor.
NOTE: Match the positive (+) mark
on the capacitor with the positive
(+) mark on the circuit board.
( ) Solder all the leads to the foil
and cut off the excess lead
lengths.
This completes the construction of
the power supply circuit board ex-
cept for the three 300 /IF 60 V capa-
citors which will be mounted later.
FI N ISH
Proceed with the mounting of the
power transformer.