Keithley 2002 Repair Manual page 44

Bit patterns
Test 202.7 — Baseline for test 202.8
Type
Fault message
Description
Drawing reference
Bit patterns
—U811—
00001101
—U224—
00010111
—U400— —U432—
01111011 10000000
*Bits associated with register IC terminals as follows:
Q Q Q Q
87654321 87654321
IC pins: Q8=11, Q7=12, Q6=13, Q5=14, Q4=7, Q3=6, Q2=5, Q1=4.
Circuit Exercise
None
Integration time is set up with I12 and I0 high and all other I lines low. This test uses the same
circuit setup as test 202.1. A zero reading is acquired and stored as baseline value for test 202.8.
Analog Board; 2002-100
A/D Converter; 2002-160
—U811—
00001101
—U224—
00010111
—U400— —U432—
01111011 10000000
*Bits associated with register IC terminals as follows:
Q Q Q Q
87654321 87654321
IC pins: Q8=11, Q7=12, Q6=13, Q5=14, Q4=7, Q3=6, Q2=5, Q1=4.
Bit pattern*
—U810—
00100000
—U206—
01110000
—U203—
10001110
—U411—
11111011
Q Q Q Q
87654321 87654321
Bit pattern*
—U810—
00010000
—U206—
01110000
—U203—
10001110
—U411—
11111011
Q Q Q Q
87654321 87654321
Troubleshooting
Register
—U809— AD_STB
00000001
—U207— MUX_STB
00110111
—U221— R1_STB
11101001
—U406— R2_STB
00000100
Register
—U809— AD_STB
00000001
—U207— MUX_STB
00001111
—U221— R1_STB
11101001
—U406— R2_STB
00000100
2-31