Agilent Technologies 54502A Manuale di Servizio Scaricare il pdf (Pagina 102)

4. Reconnect instrument power cable and check for voltages at the supply

output using values in the following table.

PIN SIGNAL PIN SIGNAL

1 +5.20 V 11 -5.2 V

2 +5.20 V 12 GROUND

3 +5.20 V 13 +12 V

4 +5.20 V 14 GROUND

5 GROUND (Display) 15 -12 V

6 GROUND (Digital) 16 GROUND

7 GROUND (Digital) 17 +12 V (Display)

8 GROUND 18 -5.2 V

9 +3.5 V 19 +15.5 V (Fan)

10 GROUND 20 GROUND (Fan)

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

power supply, but when measuring on the main assembly the supplies must be

measured with reference to the respective ground.

CRT Monitor

Signals Check

1. Remove instrument top cover.

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 monitor to

the System Assembly Board.

3. Dynamic video signals FB (Full-bright) and HB (Half-bright) are TTL

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

these signals.

PIN SIGNAL PIN SIGNAL FB HB VIDEO

1 +5 V (Digital) 2 +12 V (Display) 0 0 OFF

3 GROUND (Display) 4 GROUND (Display) 0 1 HALF

5 +12 V (Display) 6 GROUND (Display) 1 0 FULL

7 +12 V (Display) 8 GROUND (Display) 1 1 FULL

9 +12 V (Display) 10 HSYNC

11 VSYNC 12 +12 V (Display)

13 GROUND (Digital) 14 GROUND (Digital)

15 GROUND (Display) 16 FB (Full-bright)

17 GROUND (Display) 18 HB (Half-bright)

19 GROUND (Display) 20 +5 V (Digital)

Table 6-1. Power Supply/Main Assembly Voltages

Table 6-2. CRT Monitor Input Cable Pin Assignments

HP 1650B/1651B Service

Service Manual 6-15

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Agilent Technologies 54502A Manuale di Servizio Pagina 102