+5V and PCLR Circuits:

 

Node

Measurement

 

U1-8

≈ 3.5Vdc

 

U1-2

= 4 Vdc

 

U1-3

= 4.2Vdc

 

U1-4

= 4.2Vdc

 

U1-6

≈50mVdc

 

Clock Signals (see clock waveforms in Figure 3-3)

 

Node

Measurement

Source

C7+,C8+

= 12MHz (see waveform)

Y2

J5-8

= 6MHz (see waveform)

U14

U35-12

≈ 50mVdc (see waveform)

U35

Data Lines Check that all data and address lines are toggling. Address and data lines go to the following IC's:

Address Lines

Data Lines

U6: A0 to A15

U6: D0 to D7

U8: A0 to A15

U8: D0 to D7

U12: A0 to A4

U12: D0 to D7

U14: A8 to A15

U14: D0 to D7

U16: A0 to A7

U16: D0 to D7

U17: A0 to A2

U17: D0 to D7

U36: A7 to A15

Note:

Data and address lines may not toggle if one line is shorted either high or low. If no short is found, replace

 

all socketed IC's. If the data lines still do not toggle, replace the GPIB (A8) assembly.

Node

Measurement

A0 to A15

Toggling

D0 to D7

Toggling

Secondary Interface Troubleshooting

Secondary interface troubleshooting checks the operation of the voltage, current, and readback DACs as well as analog multiplexer and secondary microprocessor. The analog multiplexer is checked in the Readback DAC troubleshooting procedure. The secondary microprocessor can only be checked using secondary SA (refer to Signature Analysis).

Voltage and Current DAC

The voltage and current DACs can be checked either from the front panel or by secondary SA. Refer to Signature Analysis to troubleshoot the voltage and current DACs in this manner.

Note: To troubleshoot the voltage and current DACs from the front panel if the unit has failed selftest, place jumper A8J5 in the skip selftest position (see Table 3-2). This lets you operate the unit even though it fails the internal selftest.

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Agilent Technologies 6030A, 6035A Secondary Interface Troubleshooting, Voltage and Current DAC, Node Measurement Source