Service manual

8-14 11713A Operating and Service Manual

Servicing the Attenuator/Switch Driver

Troubleshooting the A2 Driver Assembly

The A2 driver assembly is controlled by inputs from the A3 latch

assembly which is clocked by either the A7 front panel switches or from

the GPIB through the A4 remote local logic assembly.

To Troubleshoot the A2 Driver Assembly

1. To determine the problem board assembly, test them in the following

sequence: A1 interconnect, A7 switch, A5 GPIB, A4 remote local

logic, A3 latch, and A2 driver.

2. If all the other board assemblies are in working condition, do the

following:

a. Turn the power off.

b. Open the top cover.

c. Pull out the A2 driver assembly and check the board and its

socket for damage.

d. Reinstall the board carefully.

e. Switch the power on.

f. Manually press the attenuator buttons several times. The light

should come on/off each time that a button is activated.

3. If the manual verification is satisfactory, check the

computer-controlled remote operation by sending these commands.

4. If the response s satisfactory, the A2 drive assembly should be

operational.

5. If the response is unsatisfactory, check the other assemblies first

before you decide to replace the A2 driver assembly.

Command Desired Outcome

OUTPUT 728;”A12345678” All attenuator lights go on except the local light

OUTPUT 728;”BI2345678” All attenuator lights go off except the remote light.