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Checking procedure for main parts
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
Checking the transistor module:
By touching the + side of the tester to the P
1.
terminal of ISPM and the - side of the tester to U,
V and W of ISPM, measure the resistance. If all
the resistances are more than 1 kΩ, it is normal.
By touching the - side of the tester to the P
2.
terminal of ISPM and the + side of the tester to
U, V and W of ISPM, measure the resistance.
If all the resistances are more than 100 kΩ, it is
normal.
By touching the - side of the tester to the N
3.
terminal of ISPM and the + side of the tester to
U, V and W of ISPM, measure the resistance.
If all the resistances are more than 100 kΩ, it is
normal.
By touching the + side of the tester to the N
4.
terminal of ISPM and the - side of the tester to U,
V and W of ISPM, measure the resistance. If all
the resistances are more than 1 kΩ, it is normal.
● Procedure using a digital tester:
note
The digital tester must be able to check semiconductors and continuity.
-
Based on the folowing scheme of ISPM with the contactor, the reactor, capacitors and the resistance, follow the next
procedures.
● Checking the diode module
1. By placing a jumper from +P1 to -RST or -N to +RST, no continuity and no variation on voltage drop should appear.
2. By placing a jumper from P1 to +RST or +N to RST: continuity and variation on voltage drop (nearly 0,365) should be
displayed, and the same value in all cases. Not the same value means that the diode module is damaged.
