Carrier 619FB Service Manual page 34

18K
1. Key detection point
Test9
L
D
Test5
Test12
Test No. Test Point
Test 1 Between A and C
Test 2 Between B and C
Test 3 Between D and E
Test 4 Between F and G
Test 5 Two ends of diode D15
Test 6 Two ends of electrolytic capacitor C715
Test 7 Two ends of electrolytic capacitor C710
Test 8 Two ends of electrolytic capacitor C226
Test 9 Two ends of chip capacitor C912
Test 10 Between M to GND
Test 11 Between N to GND
Test 12 Between S and T
Test3
E
K
H
Test8 Tset7
S
T
Fig. 37 – Key detection point
Corresponding component
DC busbar electrolytic capacitor
Electrolytic capacitor of power
D15(IPM modular +15V power supply)
C715 (+12V power supply)
C226 (+3.3V power supply)
C912 (+17V power supply)
Point M of R75 to ground (signal sending
Point N of R123 to ground (signal receiving
Power supply of communication ring
Test4 Test2
F G
J
I
Test6
M
N
Neutral and live wires
Neutral and live wires
C710 (+5V power supply)
port of ODU)
port of ODU)
34
C
Test1
B
A
Test10
Test11
Test value under normal condition
160V- - 265V
160V- - 265V
DC 180V- - 380V
DC 180V- - 380V
DC 14.5V- - 15.6V
DC 12V- - 13V
DC 5V
DC 3.3V
DC 15V- - 18V
Fluctuate between 0- - 3.3V
Fluctuate between 0- - 3.3V
DC 56V