Wavetek 132 Instruction Manual page 23

c.
Tag and
unsolder wires to switch wafers
A
and
B.
d.
Remove
digital
and
analog boards
as pre-
viously described.
e.
Unsolder wafer B PC-tabs
from
printed
cir-
cuit boards.
f.
Lift
switch shaft
slightly
to free PC-tabs,
rotate switch shaft so
wafers
clear
board
parts,
and
pull
shaft
end
free of
rear-
mounted
wafers
C and
D.
g.
Repair
or replace defective part.
To
repair or replace function
selector
wafers
or
OUTPUT VERNIER
(dB)
potentiometer,
pro-
ceed
as follows:
a.
Remove
rear panel
and dust cover
as pre-
viously described.
b.
Tag and
unsolder wires
to defective
part.
c.
Remove
digital
and
analog boards
as pre-
viously described.
d.
Unsolder potentiometer
PC-tabs,
lift
shaft
slightly
to free tabs, rotate
switch
shaft so
wafers
clear
board
parts,
and
pull switch/
potentiometer assembly out
of front panel
hole.
e.
Repair or
replace defective
part.
REPLACEMENT
OF
SINE
CONVERTER
1.
Remove
rear
panel and dust cover
as
previously
described.
2
Remove
digital
board
as
previously described
3.
Unsolder
the
five
pins of
sine
converter
A1
from
top of the printed
circuit board, using a
solder syringe.
4.
Lift
assembly from
bottom
of the board;
a
thin pencil-type soldering iron
can be
used,
if
necessary, to apply
temporary
heat during
re-
moval.
5.
Replace
sine
converter.