Hitachi RAS-H(V)RNME-AF Service Manual page 419

12 Troubleshooting
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Checking procedure for the ISPM
Remove all the terminals of the ISPM before check.
If items (a) to (h) are performed and the results are satisfactory, ISPM is
normal. Measure it under 1 kΩ range of a tester.
C A U T I O N
• Perform the high voltage discharge procedure as described
• Do not use a digital tester.
a. By touching the + side of the tester to the P1 terminal of ISPM and the -
side of the tester to R and S of ISPM, measure the resistance. If all the
resistances are more than 1 kΩ, it is normal.
b. By touching the - side of the tester to the P1 terminal of ISPM and the +
side of the tester to R and S of ISPM, measure the resistance. If all the
resistances are more than 100 kΩ, it is normal.
c. By touching the - side of the tester to the N terminal of ISPM and the +
side of the tester to R and S of ISPM, measure the resistance. If all the
resistances are more than 1 kΩ, it is normal.
d. By touching the + side of the tester to the N terminal of ISPM and the -
side of the tester to R and S of ISPM, measure the resistance. If all the
resistances are more than 100 kΩ, it is normal.
e. By touching the + side of the tester to the P 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.
f. By touching the - side of the tester to the P 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.
g. By touching the - side of the tester to the N 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.
h. By touching the + side of the tester to the N 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.
409
SMGB0070 rev. 1 - 08/2011
Rectification parts of internal circuit of ISPM (common)
12