–16–
M-0329B Instruction Book
Removing the Printed Circuit Board
1.
Remove the cover by loosening the four
acorn nuts.
2.
Remove the four screws that hold the
transformers to the base plate.
3.
Remove the two screws that hold the
printed circuit board to the base plate.
4.
The board can now be carefully removed
by holding the transformers to avoid
breaking the leads.
5.
Visually inspect the board for any
component which does not appear
normal or appears to have overheated.
This can often lead to finding the cause
of the trouble and the component that
needs to be replaced.
Component Replacement Procedure
1.
The M-0329B printed circuit board is
coated with a moisture-resistant,
conformal coating. If a component needs
to be changed, carefully scrape away
the coating surrounding the component
using a small, sharp knife, being careful
not to damage the foil on the printed
circuit board.
2.
Remove the old component and discard.
3.
Remove the excess solder using the
solder syringe or wick, leaving the hole
or pad clear to facilitate insertion of the
new component.
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CAUTION:
Do not attempt to melt the solder
and push the new component through the hole as
the leads are likely to catch the edge of the foil and
lift it off of the board.
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CAUTION:
If the M-0329B fails to operate
properly and you choose to repair the unit, it is
necessary to be completely familiar with the specific
circuitry involved and have an adequate
understanding of field effect devices.
9.1
Typical Voltages
Conditions
1.
Power and Voltage Inputs are 120 V
rms, 60 Hz.
2.
Measurements are made with a high
impedance true rms digital multimeter,
Fluke 45 or equivalent.
3.
Readings are made with the reference
at Test Point 3 (TP3), as shown in Figure
11, Component Location.
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s
t
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P
t
s
e
T
g
n
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a
e
R
m
r
o
f
e
v
a
W
f
o
e
p
y
T
1
P
T
V
5
1
K
8
.
0
C
D
2
P
T
V
2
2
K
2
C
D
O
V
1
P
-
P
4
P
T
V
0
1
K
2
0
.
C
D
5
P
T
w
V
5
1
K
8
.
0
C
D
6
P
T
V
5
1
K
8
.
0
C
D
9
P
T
V
4
1
K
5
.
0
C
D
(
7
C
w
)
w
V
4
2
K
2
C
D
O
V
1
P
-
P
Table 3
Typical Voltages