SEP 2005 MODEL 1000
GUIDE TO TRANSIENT PROTECTION MODULES
C-4
C.3 TROUBLESHOOTING TRANSIENT PROTECTION MODULES
To determine the integrity of a transient protection module (TPM), follow the guidelines in
these tables (see Tables C-2, C-3, and C-4):
Table C-2. Troubleshooting TPM, P/N 3-2350-002
P/N 3-2350-002
16-pin; Quad Sngl Tnst; Controller/Analyzer Interconnect,
Stream Switch, and Digital I/O (low current)
VISUAL INSPECTION
MOVs (M1-M4) Good Blue in color
Failed Discolored to brown or black
Resistors (R1-R4) Good Intact
Failed Broken, or open
EQUIPMENT DAMAGE
Remove transient protection module from board before all ohmmeter checks.
Failure to do so may cause equipment damage.
OHMMETER CHECK
MOVs (M1-M4) Good Open, or infinite ohms
Failed Shorted, or 0 (zero) ohms
Resistors (R1-R4) Good -330 ohms
Failed Open (infinite ohms) or short (0 ohms)
Diodes (Z1-Z4) Good Open (infinite ohms) in one direction and -4.12 megohms in the
opposite direction
Failed Short (0 ohms) in any one or both directions
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