Troubleshooting - Fluke 5220A Instruction Manual

5 220A
Instruction Manual
Corrected DVM Indication (mV dc)
102.000 to 101.800
101.800 to 101.600
101.600 to 101.400
101.400 to 101.200
101.200 to 101.000
101.000 to 100.800
100.800 to 100.600
100.600 to 100.400
100.400 to 100.200
100.200 to 100.000

4-41. Troubleshooting

Static discharge can damage MOS components contained in
the 5220A. To prevent this possibility use the following
precautions when troubleshooting and/or repairing the unit.
A troubleshooting guide for the 5220A is given in Table 4-4 and 4-5. The guide is in the
form of a tabular flow chart and is recommended for use in isolating a mainframe
malfunction to the PCB (board) level. Details necessary to troubleshoot faulty PCBs to
the component level can be derived from the schematic diagrams given in Section 8, and
the theory of operation in Section 3.
When using the troubleshooting guides, the following notes apply:
4-18
Table 4-5. Replacement Resistors for R13
Never remove, install, or otherwise connect, or disconnect PCBs and/or components
without disconnecting, the unit from line power.
Perform all repairs at a static-free work station.
Do not handle ICs or PCBs by their connectors.
Use static ground straps to discharge repair personnel.
Use conductive foam to store replacement or removed ICs.
Remove all plastic, vinyl, and Styrofoam products from the work area.
Use a grounded soldering iron.
Do not start in the middle of the procedure. Any given step assumes that the previous
steps have been completed. Complete Table 4-4 before going on to Table 4-5.
All measurements using external test equipment are made at test points on the various
PCB assemblies. See Figure 4-3 for test point location/identification.
Selected Value for R13 ( )
1740
1500
1282
1100
900
698
499
301
100
0
h
Caution
Fluke Part Number
357756
376947
330472
347161
460519
289330
289256
289173
357400
NA