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Troubleshooting

2-77

Components U403, U408, U412, U414, U417, U419, U430, U433, and associated components.

Bit patterns

Test 405.5 — Small negative DAC V for X10 gain comparison

Type

Circuit Exercise

Fault message None

Description DAC U433 and op amp pair U430 are set up to generate -0.210 VDC at PRECOMP+. This signal

follows the same path as test 405.1. This test has the same purpose as test 405.1, but the new test

value is used for test 405.6.

Drawing reference Analog Board; 2002-100

Bit patterns

Bit pattern* Register

—U400—

01011100

—U811—

00001101

—U224—

00010111

—U432—

10000101

—U810—

00000011

—U206—

01110000

—U203—

10001110

—U411—

11111111

—U809—

11100111

—U207—

11001111

—U221—

11101001

—U406—

01001111

AD_STB

MUX_STB

R1_STB

R2_STB

*Bits associated with register IC terminals as follows:

QQQQQQQQ

87654321 87654321 87654321 87654321

IC pins: Q8=11, Q7=12, Q6=13, Q5=14, Q4=7, Q3=6, Q2=5, Q1=4.