Agilent Technologies 89410A Service Manual page 32

Troubleshooting the Analyzer
To perform initial verification
g
Oscilloscope Setup
Connect CH1 to A90 TP1
CH1 V/div 1 V/div
Input Impedance 1 MΩ
CH1 Coupling dc
Probe Atten 10
Display Mode Repetitive
Averaging 8
Time/div 10 ns/div
Trigger Trg'd Sweep
Trig Src Chan1
Connect CH1 to A90 P10 pin 10
Connect CH2 to A90 P10 pin 12
CH1 V/div 2 V/div
Input Impedance 1 MΩ
CH1 Coupling dc
Probe Atten 10
CH2 V/div 2 V/div
Input Impedance 1 MΩ
CH2 Coupling dc
Probe Atten 10
Display Mode Repetitive
Averaging 8
20 µs/div
Time/div
Trigger Trg'd Sweep
Trig Src Chan1
h
i
j
1-14
Using an oscilloscope and 1
system clock signals.
Parameters
Time
Duty Cycle
SCLK
Time
Duty Cycle
Time Relationship
nVSYNC and nHSYNC
If SCLK is incorrect, the A40 CPU assembly is probably faulty.
Before replacing the assembly, go to
the power supply,'' and do Step 7 to check power supply voltages.
If nVSYNC or nHSYNC is incorrect, the A47 DSP/Display
Controller assembly is probably faulty.
If the signals are correct, go to
power-up failures.''
Ω
10:1 probes, check the following
M
Waveform
page 1-15, ''To troubleshoot
page 1-36 ''To troubleshoot