Tektronix 1705A instruction manual Major Assembly Interconnection

Maintenance

Major Assembly

Interconnection

General Troubleshooting Techniques

The circuit numbers of the individual components in the parts list is made up by combining the assembly number with the individual circuit number. EXAM- PLE: R117 on Assembly (circuit board) A3 is listed in the Replaceable Electrical Parts list as A3R117.

NOTE. Always consult the parts list and “Change Information” for part numbers and descriptions before ordering replacement parts. Some parts may have been replaced in an individual instrument.

Replaceable Mechanical Parts. Parts listed in the Replaceable Mechanical Parts list are assigned index numbers which correspond to circled numbers on the exploded view drawing(s).

Accessories List. Standard accessories are illustrated in the exploded view drawing. Part numbers of standard and optional accessories are given at the end of the Replaceable Mechanical Parts list.

Signals and power supply voltages are passed through the instrument with a system of interconnecting cables. The connector holders on these cables have numbers that identify terminal connectors; numerals are used from 2 up. A triangular key symbol is used to identify pin 1 on the circuit board and the connector to assist in aligning the connector with correct square pins. Figure 6-7 shows the numbering scheme (and the triangular marking) on the connector and the marking on the etched circuit board.

A pin replacement kit including necessary tools, instructions, and replacement pins is available from Tektronix, Inc. Contact a Tektronix field office or representative for assistance in ordering this kit.

Connectors with Center Polarizers. These polarizers serve as a key for proper mating with the connector on the circuit board. Pin 1 is also marked with a triangular symbol on both connectors.

The following procedure is designed to assist in isolating problems, which in turn expedites repairs and minimizes down time.

1.Ensure that the malfunction exists in the instrument. This is done by making sure that the instrument is operating as intended by Tektronix (see Operating Instructions in Section 2).

2.Determine the nature of the problem. Attempt to make the determination of whether the instrument is out of calibration or if there has been a component failure. Once the type of failure has been determined, proceed on to identify the functional area most likely at fault.

6- 10 1705A Spectrum Monitor