Heathkit IO-4205 - Page 59

Page 57
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POWER SUPPLY
CIRCUIT BOARD
Refer to Pictorial 3-6 for the following steps.
PICTORIAL 3-6
(I U303: RefertoDetail3-6A and install a UA79IC
(#442-618) at location U303 on the circuit
board. Match the notch in the IC with the index
mark on the circuit board and insert the IC pins
in their holes in the circuit board. Then press
the IC tight against the board but do not solder
its pins at this time.
( r./ Refer to Detail 3-6A and mount a heat sink at
location U303 with 3-48 x 1/4" hardware. Be
sure to
position the heat sink as shown in Picto-
rial 3-6.
i
/' Now solder the pins ofthe IC to the foil and cut
off the excess pin lengths.
[ ~ ) U301: In the same manner, install a UA78 IC
(#442-617) and a heat sink at location U301.
Position
the heat sink as shown.
( YJ U302: In the same manner, install a U78 IC
(#442-617)
and a heat sink at location U302.
Position
the heat sink as shown.
I HEAT SINK I
Detail 3-6A