Agilent Technologies 8935 Series, Manual

Page: 58 / 343

Chapter 3 57
Troubleshooting
Self-Test Diagnostics (Step 1)
The pattern generated by the LEDs can be interpreted as a
binary-weighting code. The LED (labeled 0) is the least-significant bit
(see
Figure 3-7 on page 58 ).
For example if the LEDs blinking pattern is Off, On, On, On (reading
left-to-right or LEDs “3 2 1 0”), the binary number is 0111 or decimal 7.
The error codes shown in
Table 3-1 on page 55 are weighted by the
binary value. The weighted value for this example is decimal 2
7
= 128
or hexadecimal 80. (This failure is easy to simulate; simply power-up
the Test Set while holding down a key.)