Keithley 2002 Repair Manual page 102

Test 408.6 — /200 frequency compensation
Type
Fault message
Description
Drawing reference
Components
Bit patterns
Pass/Fail
200V range compensation
Same as test 408.2. Measure the output at A/D IN.
Analog Board; 2002-100
C459, C461, Q418, Q422, U423, U425, U426, U433 and associated components.
—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—
10001110
—U203—
10001110
—U411—
00111011
Q Q Q Q
87654321 87654321
Troubleshooting
Register
—U809— AD_STB
11100111
—U207— MUX_STB
11001111
—U221— R1_STB
11101001
—U406— R2_STB
01101110
2-89