Wavetek 132 - 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.