HP 4262A User Manual

Model 4262A
Analog Section Troubleshooting Procedure to
Assembly Level (Fig. 8-18).
The troubleshooting flow diagram in Figure 8-18
helps to isolate a faulty board assembly in the
analog section. The built-in self test function is also
helpful in troubleshooting to the assembly level.
Component Level Troubleshooting Guides.
Component level troubleshooting guides are pro-
vided for each major assembly (other than for A21,
A22 and A23 boards of the digital control section)
in the service sheets. Procedures for narrowing
down the trouble possibilities in A21, A22 and
A23 boards to the component level are covered in
“Digital Section Troubleshooting Guide’’. Refer to
guideline below.
Digital Section Troubleshooting Guide.
The search for and location of a faulty component
in the digital control section is done in accord with
the troubleshooting flow diagrams in Figure 8-19.
To facilitate an “easy to make’’ failure diagnosis, a
“signature analysis’’> method was adopted for
troubleshooting both the digital and option
sections. When diagnosing with this method, a
Signature Analyzer (HP 5004A) is necessary to
properly employ the procedures and associated
signature maps (see service sheets). Refer to Figure
8-12 for signature analysis guidelines.
8-45, Table 8-3 describes typical front panel
symptoms present when 4262A internal controls
Section VIII
Paragraph 8-45
(adjustable points) are not well-adjusted. A search
for and interpretation of trouble symptoms by
operating front panel controls is important and
often gives hints as to trouble location. Table 8-4,
Front Panel Isolation Procedure provides such an
approach to troubleshooting. These primary
troubleshooting procedures are supplemental to
and should be used with the main procedures in
the flow diagrams.
WARNING
WHENEVER IT IS LIKELY THAT
THE PROTECTION PROVIDED
BY THE FUSE HAS BEEN IM-
PAIRED, THE INSTRUMENT
MUST BE SECURED AGAINST
ANY UNINTENDED OPERATION.
CAUTION
CAPACITORS INSIDE THE
INSTRUMENT MAY STILL BE
CHARGED EVEN THOUGH THE
INSTRUMENT HAS BEEN DIS-
CONNECTED FROM ALL
VOLTAGE SOURCES. BE SURE
THAT ONLY FUSES OF THE
REQUIRED RATED CURRENT
AND THE SPECIFIED TYPE ARE
USED FOR REPLACEMENT. THE
USE OF REPAIRED FUSES AND
THE SHORT-CIRCUITING OF
FUSE HOLDERS MUST BE
AVOIDED.
—— o ———— — e — ———
Troubleshooting Tree _
on each Service Sheet. I
1
[
Figure 8-12 —I
Guideline to 1
Signature Analysis.
Option Section Isdla-
tion Procedure.
] Power Supply Section
START Isolation Procedure
____!__
[ |
|
(I i
Troubleshooting Helpful |
Procedure Instructions
Figure 8-11 Built-in | _ ] Séction Trouble-
l—Se]f Test Function. J
Figure 8-19 Digital
Section Trouble-
shooting
Procedure.
Analog and Digital
Section Isolation
Procedure.
|
|
|
|
|
] Y
|
|
J
A
)
- -1
Figure 8-18 Analog Table 8-4 Front
j= — —{ Panel Isolation
| Procedure. J
shooting Guide -
Assembly Level.
Troubleshooting Tree
on each Service Sheet.
Figure 8-10. How To Use Troubleshooting Guides.
817

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English