Test 500.2 — 4W SENSE
Bank SENSE
Inputs 4-wire short
Expected Value 0 volts
Limits 0.0001 volts
Fault Message SENSE HI
Description This test requires a 4-wire short at the input. The SHI node is the Sense HI
jack on the front or rear panel. The 4-wire short connects SHI to LO. The 0V
signal at SHI is routed through R120, R124, R121, R125 and Q113 (4W con-
trol line high) to U113 BUFCOM. As in previous tests, this signal goes to the
A/D MUX which is configured for ×1 gain. Measure 0V at AD_IN.
Bit patterns
Bit pattern Register
QQ
87654321
—U106—
110v1111
QQ
87654321
—U109—
00101111
QQ
87654321
—U134—
1v10000v
—U130—
10111101
QQ
87654321
—U121—
01101000
ACDC_STB
MUX_STB
IC pins: Q8=11, Q7=12, Q6=13, Q5=14, Q4=7, Q3=6, Q2=5, Q1=4
Troubleshooting 2-53
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