Keithley 2002 Repair Manual page 104

Bit patterns
Test 409.3 — Setup for test 409.5 and A/D measurement for test 409.6
Type
Fault message
Description
Drawing reference
Bit patterns
—U811—
00001101
—U224—
00010111
—U400— —U432—
01111101 11111111
*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
In this phase, DAC A is programmed with 0s, and the output at pin 2 is tied to C463. The rest of
this test is the same as Test 408.3.
Analog Board; 2002-100
—U811—
00001101
—U224—
00010111
—U400— —U432—
01111101 00000000
*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—
00000011
—U206—
01110000
—U203—
10001110
—U411—
00111010
Q Q Q Q
87654321 87654321
Bit pattern*
—U810—
00000011
—U206—
01110000
—U203—
10001110
—U411—
00111010
Q Q Q Q
87654321 87654321
Troubleshooting
Register
—U809— AD_STB
11100111
—U207— MUX_STB
11001111
—U221— R1_STB
11101001
—U406— R2_STB
01101100
Register
—U809— AD_STB
11100111
—U207— MUX_STB
11001111
—U221— R1_STB
11101001
—U406— R2_STB
01101110
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