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5.4.4 Static Impedance Characteristic Of PCB board.
After finding out the failure board, to find the broken component, you can measure the
impedance of the major components with a multimeter. Following tables record Static Impedance
Characteristic Of PCB board for reference.
5.4.4.1 PSDR Board
a. IP Rectifier parts:
Item
Checked components
DVM Function
Reference Value
Fail Condition
1
F301, F302
Ω
0
Ω
open
2
Q301
Q302
(A, K)
Ω
≈
1.4M
Ω
short
(G, K)
Ω
≈
10
Ω
short
b. Voltage boosting parts:
Item
Checked components
DVM Function
Reference Value
Fail Condition
1
Q306, Q308
F
Q310
Q307, Q309
F
Q311
(E, C)
Ω
≈
800k
Ω
short
(G, E)
Ω
15.8k
Ω
short or open
2
D308, D310
DIODE
≈
0.35V
0V
3
R325, R331, R334, R342
F
R337
F
R328
Ω
10
Ω
open
4
R390, R388, R389
F
R393
F
R392
F
R391
Ω
2.2
Ω
open
4
D302, D304, D306, D303
F
D305
F
D307
DIODE
≈
12
Ω
open
c. Battery switch parts:
Item
Checked components
DVM Function
Reference Value
Fail Condition
1
F303
F
F304
Ω
0
Ω
open
2
Q305
(A, K)
Ω
≈
2.5M
Ω
short
(G, K)
Ω
≈
10
Ω
short
d. INV parts:
Item
Checked components
DVM Function
Reference Value
Fail Condition
