PRE-POWER CHECKS
TM-246193 Page 34 Invision 352 MPa
8-4. Input Pre-Regulator Module (MOD1)
Ref. 907161 / 258043-C
! Read and follow safety
information in Section 8-2
before proceeding.
! Wear an earth grounded
wrist strap when perform-
ing pre-power and power
off checks. Remove wrist
strap before performing
any checks or procedures
with power applied to the
machine.
Board layout may differ from
that shown.
1 MOD1
Visually inspect MOD1 for dam-
age.
Check all measurements for
MOD1. (see Section 8-5).
If any of the measurements
do not read correctly, replace
MOD1 and MOD2. If an input
SCR measures short also re-
place PC2.
NOTICE − MOD1 and MOD2 are
different and must be installed in
the proper location.
Match the number on the side of
each module to the number on
PC2.
MOD1 is skiip 83 HEC
MOD2 is skiip 83 EC
The modules come as a kit with in-
stallation instructions that need to
be followed entirely.
Continue to the end of the
pre-power checks.
1
Test Equipment Needed:
Component Side Of Board
−BUS
L1-L2
D12
TP1
AC1
L1
AC2
AC3
KA
RC3
8-5. Input Pre-Regulator Module (MOD1) Test Point Values
If any of the measurements do not read correctly, replace MOD1 and MOD2. If an input SCR is shorted, also replace PC2.
Input Pre-Regulator Module MOD1 DMM Positive Lead DMM Negative Lead DMM Diode DMM Ohms
Boost IGBT −BUS L1-L2 0.20 - 0.90 N/A
Boost IGBT (w/Plug Removed From RC3) D12 Left −BUS N/A 100k
Boost Snubber Diode L1-L2 TP1 0.20 - 0.90 N/A
Input SCR L1 AC1 OL N/A
Input SCR L1 AC2 OL N/A
Input SCR L1 AC3 OL N/A
Input Diode −BUS AC1 0.20 - 0.90 N/A
Input Diode −BUS AC2 0.20 - 0.90 N/A
Input Diode −BUS AC3 0.20 - 0.90 N/A
Input Pre-Regulator Module MOD1 IGBT Tester Positive Lead - RED IGBT Tester Negative Lead - BLACK Gate
Boost IGBT (w/Plug Removed From RC3) L1-L2 −BUS RC3-2
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