2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
103
3.5.3.1.1 A10 Port-1 Frequency-Selection Error Test
1
Jumper the SEL-A terminal on A10 to chassis ground.
2
Recheck port 1 with scope.
3
Verify presence of 5-MHz signal.
4
Remove clip lead.
QUESTION:
Is a 5-MHz signal present?
If Yes:
Remove power, replace A7, and retest.
If No:
Remove power, replace A10, and retest.
3.5.3.2 A10 Port-1 Frequency Error (5, not 10 MHz)
QUESTION:
Is the port 1 output 5 MHz when it should be 10 MHz?
If Yes:
Go to, 3.5.3.2.1.
If No:
Go to, 3.5.4.0.
3.5.3.2.1 A10 Port-1 Frequency Selection Error Test
1
Check SEL A on A10 with a DMM.
2
Verify that it is no greater than 2 volts.
QUESTION:
Is the SEL A voltage 2 or less?
If Yes:
Go to, 3.5.3.2.2.
If No:
Remove power, replace A10, and retest.
3.5.3.2.2 A10 SEL-A Line Test
1
Remove instrument power.
2
Unsolder white wire from SEL-A terminal and re-check with DMM.
3
Reapply instrument power.
4
Verify that voltage on wire is greater than 2 volts.
QUESTION:
Is voltage greater than 2 volts?
If Yes:
Remove power, replace A7, and retest.
If No:
Remove power, replace A10, and retest.
Summary of Contents for 5071A
Page 2: ......
Page 40: ...1 Performance Tests Verifying Specifications 5071A Complete Performance Tests 24 ...
Page 48: ...2 Service Pre Troubleshooting Information 32 Figure 2 1 Instrument Top View ...
Page 168: ...3 Theory of Operation Functional Block Descriptions 152 Figure 3 5 Power Supply Block Diagram ...
Page 173: ......
Page 194: ...5 Replaceable Parts How To Order A Part 178 ...
Page 197: ......
