Crt Monitor Signals Check - HP 1652B Getting Started Manual

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Reconnect the power cable and turn on the instrument.

Then check for the

voltages at the supply output using the values in the following table.

Power Supply/Main

The ground planes (digital, fan, and display) are at the same potential on the

power supply, but when you are measuring them on the main assembly, the

supplies must be measured with reference to the respective ground.

1. Remove the instrument top cover.

Signals Check

2. Check the CRT Monitor input cable for the signals and supplies listed in the

table below. The cable is the wide ribbon cable connecting the

assembly to the System Assembly Board.

3. Dynamic video signals FB (Full-bright)

and HB (Half-bright)

inputs. Check for activity on these lines. The table includes a truth table for

these signals.

Input Cable Pin Assignments

+5 V (Digital)

FB (Full-bright)

HB (Half-bright)

+5 V (Digital)

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