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Turn
Instrument
ON.
Press
The
Front
Panel
TEST
Button.
Proper Operation
Of The
TEST
Function
Is
Indicated
Bv The
Front
Panel
Going
Blank For
A
Few
Secotvfs
And
Then
All
From
Panel
Enunciators (Except
REAi^
TERMINAL)
Being
Lit
And
A
Display
of
+ 8888888
With
A'l
Decimals
Lit
Or
If
A
Failure
Is
Detected
By The
TEST
Routine.
A
Number.
From
0
To
1
3
Will
Be
Displayed.
YES
The
Proper
Operation
Of The
TEST
Function
Indicates
That
The
Majority
Of The
Inguard
And
Outguard
Logic
Is
Functioning
Properly.
The
TEST
Function
Does
Not Check The
Following
Circuits:
AC
Converter,
Ohms
Converter,
Front
Panel Switching,
HP-IB
Interface,
And Some
Of
The
Input Switching
Circuits
On
The
AID
Assembly.
Refer
To
The
HP-IB
Section
Of The
Outguard
Troubleshooting
Procedure
For
HP-iB
Problems.
Refer
To
The
Schematics
And
Theory
of Opera-
tion
For
Troubleshooting
The
Other
Circuitry.
YES
A
Failure
Code
Indicates
That
One
Or
More Of The
Auto-Cal Constants
Is
Out
Of
Test
Limits.
Record
Number
Displayed
1
Turn The
Instrument
OFF.
Disconnect
The
Test
Jumper
On
the
A3
Assem-
bly
And
The
Connector
From
A1J7.
Turn
The
Instrument
ON,
Proper Operation
Of The
Out-
guard
Test
Routine
Is
Indicated
By
A
Number
or Character Being
Strobed
Across
The
Display
And
The
Enurtciators
Being
Alter-
nately
Lit,
Go
To
Outguard
Trouble-
ahootlng Section
Or Ap-
propriate
Service
Group
(See
Paragraph 6-198).
The Numbers
Recorded
Indicate
Which
Tests
Have
Failed.
Use
The
Front
Panel
TEST
Troubleshoot-
ing
Information Portion
Of
The
Inguard Troubleshooting
Section,
Along With
The
Schematics
To
Troubleshoot
The
Inguard
Switching.
Go
To
Inguard/Outguard
Transfer
Circuitry
Trouble-
shooting Procedure
Figure
8-H-17
Or
Appropriate
Service
Group
(See
Para-
graph
8-1 98).
3455-B-ll
Figure 8-H-2. General Troubleshooting
Procedure Diagram.
8-79
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