Heath Heathkit SB-104A, Manual

Page: 62 / 204

Page 1-60
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METAL S C R E W
S H I E L D
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PICTORIAL 4-4
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PICTORIAL 4-3
Refer to Pictorial
4-4
for the following steps.
On the foil side of the circuit board, scrape a little of
the blue coating off the board at each retaining tab.
Then solder each of the four tabs to the foil.
Connect the wire coming from circuit board hole B to
the capacitor lead at hole 8 (S-1 ).
Connect the wire coming from circuit board hole A to
the capacitor lead at hole A (S-1).
CAUTION: Do not place any strain on the feedthrough
capacitors, as the ceramic insulation can be damaged.
( )
Mount the shield top to the shield box with two
#6
x
3/8" screws. Disregard the two unused holes.
Set the assembly aside until called for in a step.
C851: From the outside of the shield box, install a
.001
F
feedthrough capacitor in hole A. Solder the
metal collar of the capacitor to the shield box.
C855: Similarly, install and solder a .001
F
feed­
through capacitor in hole B in the shield box.
Cut the leads of two .001
F
feedthrough capacitors
to 1/8" from the ceramic.
NOTE: If one of the sheet metal screws is touching disc
pacitor C853, bend the capacitor away from the screw.
eler to Pictorial 4-3 for the following steps.
{ ) Position the converter circuit board between the
retaining tabs of both shields and assemble the shield
with two #6 x 3/8" screws. These two sides are
symmetrical.