b. Power supply in location P01This ends the procedure.v No: Continue with the next step.3. Is this a Model 270 system unit, with processor feature 22A7, 22A8, 22AA, 22AB, 2423, 2424?v Yes: See Locations — Model 270. Replace the power supply in location P01. Be sure to IPL inSLOW OVERRIDE mode after the replacement.This ends the procedure.v No: Continue with the next step.4. This is a Model 820. See Locations — Model 820. Replace the following FRUs in order one at a timeuntil the problem is resolved.Note: Be sure to IPL in SLOW OVERRIDE mode after each replacement.a. Power supply in location P01b. Power supply in location P02c. Power supply in location P03This ends the procedure.5. Is this system a Model 830, SB2 system unit and FC 9074?v No: Continue with the next step.v Yes: See Locations — Models 830, SB2 system unit with FC 9074 base I/O tower. Replace thefollowing FRUs in order one at a time until the problem is resolved. See the Remove and replaceprocedures.Note: Be sure to IPL in SLOW OVERRIDE mode after each replacement.a. Processor regulator card in location M01 in the 830 system unit.b. Power supply in location PP1 in the 830 system unit.c. Power supply in location PP2 in the 830 system unit.6. This is a Model 840, SB3 system unit and FC 9079 base I/O tower. See Locations — Models 840, SB3system unit with processor tower and FC 9079 base I/O tower. Replace the following FRUs in orderone at a time until the problem is resolved. See the Remove and replace procedures.Note: Be sure to IPL in SLOW OVERRIDE mode after each replacement.a. Processor regulator card in location M04 in the 840 system unit.b. Processor regulator card in location M07 in the 840 system unit.c. Power supply in location P01 in the 840 system unit.d. Power supply in location P02 in the 840 system unit.e. Power supply in location P03 in the 840 system unit.f. Power supply in location P04 in the 840 system unit.g. Power supply in location P05 in the 840 system unit.This ends the procedure.CHECKFor use by authorized service providers.If the attached device is an external device, do the following before exchanging any parts:1. Ensure that the device is powered on.2. Is there a SCSI interface between the IOP/IOA?v No: Continue with the next step.v Yes: Perform the following:– If an interposer is required, make sure that it is connected between the I/O Processor and theSCSI cable.Analyze hardware problems 319
