Maintenance
6-10 1705A Spectrum Monitor
The circuit numbersof the individual components in the parts list is made up by
combining the assemblynumber with the individual circuit number. EXAM-
PLE: R117 on Assembly (circuit bo ard) 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 beforeordering replacement parts. Some parts may have been
replacedin an individual instrument.
Replaceable Mechanical Parts.P arts listed in the Replaceable Mechanical
Parts list areassigned 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 stand ard and optional accessories are given at the end
of the Replaceable Mechanical Parts lis t.
Signals and power supply voltagesare passed through the instrument with a
system of interconnectingcables. The connectorholders on these cables have
numbers that identifyterminal connectors; numerals are used from 2 up. A
triangularkey symbol is used to identify pin 1 on the circuit board and the
connectorto assist in aligning the connector with correct square pins. Figure 6-7
shows the numbering scheme (andthe triangular marking) on the connector and
the marking on theetched circuit board.
A pin replacement kit including necessary too ls, instructions, and replacement
pins is available from Tektronix,Inc. Contact a Tektronix field office or
representativefor assistance in ordering this kit.
Connectors with Center Polarizers . These polarizers serve as a key for proper
mating with the connectoron the circuit board. Pin 1 is also marked with a
triangularsymbol on both connectors.
The following procedureis designed to assist in isolating problems, which in
turn expeditesrepairs and minimizes down time.
1. Ensure that the malfunctionexists in the instrument. This is done by making
sure that theinstrument is operating as intended by Tektronix (see Operating
Instructions in Section2).
2. Determinethe nature of the problem. Attempt to make the determination of
whether the instrumentis out of calibration or if therehas been a component
failure. Once the type of failure has been determi ned, proceed on to identify
the functionalarea most likely at fault.
Major AssemblyInterconnectionGeneral TroubleshootingTechniques