Agilent Technologies 8719ET Service Manual page 205

Digital Control Troubleshooting
Run the Internal Diagnostic Tests
Table 6-2 Internal Diagnostic Test with Commentary
Failed Test
0 All Int M
1 Preset M
2 ROM P,AI
3 CMOS RAM P,AI
4 Main DRAM P,AI
5 DSP Wr/Rd P,AI
6 DSP RAM P,AI
7 DSP ALU P,AI
8 DSP Intrpt P,AI
9 DIF Control P,AI
10 DIF P,AI
Counter
11 DSP P,AI
Control
12 Fr Pan M
Wr/Rd
13 GPIB AI
(CPU Board)
14 Post-reg P,AI
15 Frac-N Cont P,AI
16 Sweep Trig P,AI
17 ADC Lin M
18 ADC Ofs M
19 ABUS Test M
20 FN Count AI
* P = part of Preset sequence; AI =part of ALL INTERNAL sequence; M= Manual.
†
in decreasing order of probability.
6-18
Probable Failed
*
Seq.
See Chapter 4 , "Start
Troubleshooting Here."
See Chapter 4 , "Start
Troubleshooting Here."
CPU board (A7)
CPU board (A7)
CPU board (A7)
CPU board (A7)
CPU board (A7)
CPU board (A7)
CPU board (A7) or
Digital IF (A10)
CPU board (A7) or
Digital IF (A10)
Digital IF (A10) or
CPU board (A7) or
Reference (A12)
Digital IF (A10) or
CPU board (A7)
Front Panel interface (A2) or
Front Panel keyboard (A1)
or CPU board (A7)
CPU board (A7)
Preregulator (A15) or
Post regulator (A8) or
Destination assembly
Fractional-N digital (A14)
Fractional-N digital (A14) or
Digital IF (A10)
Digital IF (A10)
Digital IF (A10)
Digital IF (A10)
Fractional-N digital (A14) or
Fractional -N analog (A13)
or Digital IF (A10)
8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
†
Assemblies : Comments and
Troubleshooting Hints
Executes tests 3-11, 13-16,20.
Executes tests 2-11, 14-16. Runs at
power-on or preset.
Repeats on fail; refer to
Board (A7) Troubleshooting" on
page 6-4
Replace A7.
Repeats on fail; replace A7.
Replace A7.
Replace A7.
Replace A7.
Remove A10, rerun test. If fail,
replace CPU board (A7). If pass,
replace A10.
Most likely A7 assembly.
Check analog bus node 17 for 1
MHz. If correct, A12 is verified;
suspect A10.
Most likely A10.
Run test 23. If fail, replace A2. If
pass, problem is on bus between A7
and A2 or on A7 assembly.
Check A7J2 pin 48 for 4 MHz clock
signal. If signal is bad, replace A7.
See Chapter 5 , "Power Supply
Troubleshooting."
Replace A14.
Most likely A14
Replace A10.
Replace A10.
Replace A10.
Most likely A14 or A13, as previous
tests check A10. See Chapter 7 ,
"Source Troubleshooting."
"CPU
Service Guide