Always check unit before applying power (see Sections 8-2 thru 8-11).
TM-246193 Page 47Invision 352 MPa
8-20. Control Board PC1 Test Point Values
a) Tolerance − ±10% unless specified
b) Reference − to circuit common
(lead 42) unless noted
PC1 Voltage Readings
Receptacle Pin Type Value
RC1
! Do not measure − high voltage present.
RC2
! High voltage present. Voltages on this receptacle can exceed 900 volts DC from chassis (GND).
NOTE: All pins on this receptacle are referenced to the primary − Bus
1 Input Primary (+) bus; regulated to 940 volts DC with respect to primary (−) bus.
2 Not used
3 Not used
4 Input Primary (+) rectifier; rectified primary line volts.
RC3
! High voltage present. Voltages on this receptacle can exceed 900 volts DC from chassis (GND).
NOTE: All pins on this receptacle are referenced to the primary − Bus
1 Input Do not measure − Boost inductor current feedback; 1 volt DC per 16 amps of boost inductor current
2 Output +15 volts DC; regulated with respect to primary (−) bus
3 Output −12 volts DC; regulated with respect to primary (−) bus
4 Output Do not measure − Boost IGBT gate drive signal
5 Do not measure − Boost IGBT gate drive signal return
6 Precom Circuit common referenced to primary (−) bus
7 Precom Circuit common referenced to primary (−) bus
8 Precom Circuit common referenced to primary (−) bus
9 Input Do not measure − Main transformer current sense CT; senses overcurrent in T1 transformer primary
10 Do not measure − Main transformer current sense CT return
11 Output Precharge relay coil return; 0 volts DC = relay contacts open, −12 volts DC = relay contacts closed with
respect to primary (−) bus
12 Not used
13 Input Do not measure − Test point, used to test board only
14 Input Do not measure − Test point, used to test board only
RC5
! High voltage present. Voltages on this receptacle can exceed 900 volts DC from chassis (GND).
NOTE: All pins on this receptacle are referenced to the primary − Bus
1 Output Control transformer primary; 665 volts AC RMS with respect to RC5 pin 3
2 Not Used
3 Output Control transformer primary; 665 volts AC RMS with respect to RC5 pin 1
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