Heathkit SB-1000 - Meter Circuit Board Assembly

Page 24
Refer
Heathkit
STEP-BY-STEP ASSEMBLY
to Pictorial 4-1 while you perform the
following steps.
NOTE: This circuit board has foil patterns on both
sides, but only one side has the outlines of the com-
ponents (parts) shown on it. Be sure to install the
following components on the side of the circuit board
that has the outlines on it, and solder the leads to
the foil on the
other side, unless a specific step
directs you otherwise.
Section 1
O
QO
)
R202: 0.6 Q, 3-watt, 1% resistor.
R205: 15 kQ, 1/2-watt (brn-grn-org) resistor. x
C201: .01 uF (103) axial-lead ceramic capacitor.
R206: 10kQ, 1/2-watt (brn-blk-org) resistor.
R203: 1.5.Q, 3-watt, 1% resistor.
Solder the leads to the foil and cut off the
excess lead lengths.
Section 2
QO
O
Q
O
R207: 33 kQ, 1/2-watt (org-org-org) resistor.
C203: .01 [AF (103) axial-lead ceramic capacitor.
R201: 10Q, 1/2-watt (brn-blk-blk) resistor.
Solder the leads to the foil and cut off the
excess
lead
lengths.
QO
Refer to Pictorial 4-2 while you perform the
following steps.
Section 1
12)
Q201: 2N3904 transistor (#417-875). Position
the flat side of the transistor over the outline
of the flat on the circuit board. Then start the
leads into their corresponding holes. Position
the transistor 1/4" above the circuit board.
Then solder the leads to the foil and cut off any
excess lead lengths.
FLAT
C202: 10 uF electrolytic capacitor. Before you
install an electrolytic capacitor, look at it and
identify the leads. One lead will have a
positive (+) mark or a negative (-) mark near it
on the side of the capacitor. (The marking for a
negative lead may look like an oblong bar,
sometimes with a circle around it, inside an
arrow.) Be sure to install the positive lead in
the positive-marked hole, or the negative
lead in the negative-marked hole.
NEGATIVE
(~)
NEGATIVE
() MARK
(+) MARK
R204: 100 kQ control. Start the lugs into the
circuit board holes and push the control down
tight against the board. Then solder the lugs to
the foil.