Agilent Technologies 35670A Service Manual page 193

Agilent 35670A
Binary
(DS5) (DS9)
1111 1111
0000 0000
0000 1000
0000 0010
0001 0100
0001 0110
0001 1100
0000 0000
1010 0000
1010 0001
1010 0010
0101 1110
1111 1111
0 = LED off
1 = LED on
† When no failure occurs, these codes appear for only a very short time and probably won't be visible.
• If the power-on LEDs display a code for more than 4 seconds, a failure
occurred in the core assemblies or on the buses.
For additional information on the power-on test, see the ''Power-on Test
Descriptions'' on page 10-3.
Step 3. Determine the next step by comparing the power-on test results to the
G
following table.
Power-on LEDs
LEDs stop and display a fail code.
A7 DS101 (green, run LED) is off.
LEDs pass, but the screen is defective.
LEDs pass, but it takes more than 3 minutes before the keys are active.
LEDs pass and screen appears normal, but keys do not function.
Hexa- ~Time LEDs
decimal Visible
FF 200 ms on
00 200 ms off
08 †
02 †
14 †
16 †
1C 4s
00 4s
A0 †
A1 †
A2 †
AE 200 ms
FF Remain on
Troubleshooting the Analyzer
To troubleshoot power-up failures
Description
A7 flashes LEDs
starting A7 test
A8 RAM DSACK test
starting A8 RAM test
starting A8 refresh test
starting A8 program ROM test
clear LEDs
A7 MFP test
starting A7 DSP test
fast bus test
front panel test
Next Test
CPU, memory, and
buses, page 4-18
Display, 4-22
IIC Bus, page 4-25
4-17