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8-34.
TROUBLESHOOTING (FAILURE ANALYSIS)
8-35. Information to help locate a fault or trouble in the 5004A i s given in the following
material.
8-36. Several troubleshooting aids are permanently built-in the 5004A. The SELF-TEST front
panel switch is one. The main assembly (motherboard) NORMAL SERVICE switch i s another.
The front panel GATE lamp is another. The four-front panel seven-segment digit displays are
another. The front panel UNSTABLE SIGNATURE is another.
8-37. t h e front panel SELF-TEST switch operation is described in Section Ill of this manual.
8-38.
Troubleshooting Flowchart
8-39. Figure 8-7, the troubleshooting flowchart may be used to locate a faulty component.
A suggested sequence for troubleshooting is:
a.
Perform the Operator's Self-Test (see in Section
If the 5004A does not pass the Operators Self-test, perform the steps given in the trouble-
b.
shooting flowchart (Figure 8-7).
8-40.
Major Test Point Signatures
8-41.
Table 8-7 lists the signatures for the major test points.
Switches
Table 8-2 is a listing of signatures taken from a correctly operating 5004A with a second
8-43.
correctly operating 5004A. These signatures may be used to locate the cause of a malfunction
in a 5004A Signature Analyzer. To take most of the signatures listed requires that the top cover
of the 5004A be removed. Refer to the disassembly procedures before attempting to remove the
top cover.
IF 'THE 5004A TOP COVER IS REMOVED, DANGEROUS VOLTAGES
ARE EXPOSED. ONLY QUALIFIED ELECTRONIC SERVICE TECH-
NICIANS SHOULD AlTEMPT T O SERVICE THE 5004A WITH
COVERS REMOVED.
Read Only Memory (ROM) with 32 addresses. Address selection is determined
by the five upper inputs which are decoded into 32 possible addresses (A00
through A31) corresponding to the weighting modifiers at the inputs. Input
modifier
(pin 15) gates the outputs. Stored data will be read from the selected
memory address if
is active (low). The output data pins (1-7 and 9) are active
low. The
indicator shows the 8 outputs arecapableof supplying low outputs
only. A high output is usually supplied by a resistor to a "high" voltage.
WARNING
Model 5004A
Service
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Table of Contents
Troubleshooting
