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POWER WAVE 450
F-49 F-49
INPUT RECTIFIER RESISTANCE TEST (continued)
TROUBLESHOOTING & REPAIR
9. Check all leads connected to the input
rectifier. Check for looseness or shorted
wires.
10. Using an analog type meter, perform the
resistance test Steps A through L accord-
ing to the Table F.1.
NOTE: If terminals AC1, AC2, and AC3 of
the input rectifier are not easily
accessible, use terminals T1, T2,
and T3, respectively, of main con-
tactor CR1 for the resistance mea-
surements. Similarly, if terminals
POS and NEG of the input rectifier
are not easily accessible, use ter-
minals POS and NEG of the recon-
nect switch for the resistance mea-
surements.
11. After the test is completed and the prob-
lem successfully repaired, reconnect the
negative leads to the reconnect switch.
Fasten the reconnect switch assembly
back into position on the machine.
NOTE: If input rectifier was shorted, other
components may be faulty.
Perform Field Effect Transistor/
Switch Board Test and check for
“leaky” or “shorted” capacitors.
12. Install the machine case sides and top.
13. Install the handle and the lift bail rubber
gasket.
TABLE F.1 – INPUT RECTIFIER RESISTANCE VALUES
Step Place Place
(See + Lead - Lead
Note) Test for on . . . on . . . If . . . Then . . .
A 1K Ohms POS AC1 >1K Ohms Go to step B.
<100 Ohms Tested failed.
B 1K Ohms POS AC2 >1K Ohms Go to step C.
<100 Ohms Tested failed.
C 1K Ohms POS AC3 >1K Ohms Go to step D.
<100 Ohms Tested failed.
D 1K Ohms AC1 NEG >1K Ohms Go to step E.
<100 Ohms Tested failed.
E 1K Ohms AC2 NEG >1K Ohms Go to step F.
<100 Ohms Tested failed.
F 1K Ohms AC3 NEG >1K Ohms Go to step G.
<100 Ohms Tested failed.
G <100 Ohms AC1 POS <100 Ohms Go to step H.
>1K Ohms Test failed.
H <100 Ohms AC2 POS <100 Ohms Go to step I.
>1K Ohms Test failed.
I <100 Ohms AC3 POS <100 Ohms Go to step J.
>1K Ohms Test failed.
J <100 Ohms NEG AC1 <100 Ohms Go to step K.
>1K Ohms Test failed.
K <100 Ohms NEG AC2 <100 Ohms Go to step L.
>1K Ohms Test failed.
L <100 Ohms NEG AC3 <100 Ohms Input Rectifier OK
>1K Ohms Test failed.