Hitachi SJ100 Series, Service Manual

Page: 31 / 75

[3] Rectifier Measurement
This is to measure 6 rectifiers of the input side.
Resistance Measurement Allowable Value
From To
R(Ll) S(L2) 50kohm or more
S(L2) R(Ll)
S(L2) T(L3)
T(L3) S(L2)
T(L3) R(Ll)
R(Ll) T(L3)
R(Ll)
R(Ll)
S(L2)
S(L2)
T(L3)
T(L3)
Each R(Ll), S(L2) and
T(L3)
- 50kohm or more
- Each R(Ll), S(L2) and
T(L3)
50 ohm or less
Each R(Ll), S(L2) and
T(L3)
P1 50 ohm or less
P1 Each R(Ll), S(L2) and
T(L3)
50kohm or more
To make sure MOV, visual check of MOV is necessary on the ISPM.
If the result is out of its spec, replace the unit. ( relative check is important )
MOV(ZNR);ZNR1,ZNR2,ZNR3 are for phase to phase
MOV(ZNR);ZNR4,ZNR5,ZNR6 are for phase to ground
R(L1)
T(L3)
S(L2)
P1
6-2
+
+1
U
R
(Ll)
W
V
T
(L3)
S
(L2)
Main circuit of SJ100
+
RS
P1
PD
THY
Rsh
CTU
CTW
RB