Maintenance
6–14
VX1411 MainFrame Instruction Manual
Troubleshooting Procedures
The troubleshooting procedures are designed to isolate problems to a module
level. No component-level procedures are provided.
The following test equipment is recommended for troubleshooting procedures.
H
Digital Voltmeter (Tektronix DM250 series digital voltmeter)
H
Oscilloscope, 20 MHz BW, with 10x Probe (Tektronix TDS400A or
TDS500A series oscilloscope)
The VX1411 Mainframe does not include diagnostics. The functionality of the
mainframe can be verified by following the performance verification procedures
as described in Performance Verification beginning on page 5–1.
The mainframe has two fuses for normal operation, the line fuse and a 5 V fuse
on the backplane. The line fuse can be one of two different kinds depending on
the operating voltage of the mainframe. Table 6–1 summarizes the different fuses
in the mainframe.
Table 6–1: Fuses
Voltage
Rating
Tektronix replacement
part number
90 V to 250 V operation
10 A, Fast Blow, 250 V
159-0047-00
207 V to 250 V operation
4 A, Slow Blow, 250 V
159-0397-00
5 V Backplane
4 A, Fast Blow, 250 V
159-0320-00
The main focus of the troubleshooting procedures is to isolate problems to one of
the major modules within the mainframe. You may find it helpful to refer to the
functional block diagram in Figure 6–10 on page 6–17 to isolate problems to one
of the modules within the mainframe.
Power Supply Problems.
Use the following information to isolate power supply
problems to the power supply or to other modules.
H
Isolate the problem to either the mainframe or to one of the installed VXIbus
Modules. Remove the modules from the mainframe and check that the
problem still exists.
H
Try isolating the problem to a module by either replacing the module with an
known-good module or moving the module to a different slot.
Equipment List
Diagnostic Information
Fuses
Fault Isolation
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