Hitachi YUTAKI Series - Page 221

219
Checking procedure for main parts
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
Touch [+] of the tester to [P] of DIP-IPM (soldered 5.
part),and[-]toDIP-IPMU,V,Wterminalstomeasure
the resistance.
Normalifallthreeterminalshave1kΩorgreater.
Contraryto[5],touch[-]ofthetesterto[P]ofDIP-IPM6.
(solderedpart),and[+]toDIP-IPMU,V,Wterminals
to measure the resistance.
Normalifallthreeterminalshave30kΩorgreater.
(Resistance gradually increases during measurement.)
Touch[-]ofthetesterto[N]ofISPM(solderedpart),7.
and[+]toISPMU,V,Wterminalstomeasurethe
resistance.
Normalifallthreeterminalshave1kΩorgreater.
Contraryto[7],touch[+]ofthetesterto[N]ofDIP-IPM8.
(solderedpart),and[-]toDIP-IPMU,V,Wterminalsto
measure the resistance.
Normalifallthreeterminalshave30kΩorgreater.
(Resistance gradually increases during measurement.)
Internal circuit of ACT part of inverter module
Non-faultyif[9]–[13]arecheckedandsatised.
(Measurewith1kΩrangeofatester.)

note
DO NOT use a digital tester -
Check items [1] – [8].9.
Touch[+]ofthetestertoDIP-IPMDCL2terminal,and10.
[-] to [P] of ISPM/DIP-IPM (soldered part) to measure
the resistance.
Normalifallthreeterminalshave100kΩorgreater
Contraryto[10],touch[-]ofthetestertoDIP-IPM11.
DCL2terminal,and[+]to[P]ofDIP-IPM(soldered
part) to measure the resistance.
Normalifallthreeterminalshave1kΩorgreater.
Touch[+]ofthetestertoDIP-IPMDCL2terminal,and12.
[-] to [N] of DIP-IPM (soldered part) to measure the
resistance.
Normalifallthreeterminalshave100kΩorgreater.
Contraryto[12],touch[-]ofthetestertoDIP-IPM13.
DCL2terminal,and[+]to[N]ofDIP-IPM(soldered
part) to measure the resistance.
Normalifallthreeterminalshave10kΩorgreater.
(Resistance gradually increases during measurement.)
Contactwithspeciedterminals
to measure.
Tester
Contactwithspeciedterminals
to measure.
Tester
External Appearance and Internal
Circuit of Transistor Module