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NOTE
;
The
Signature
Analyzer
Controls
Should Be
Set
As
Follows
For
This
Test!
LINE
ON
(IN)
START
\-(lN)
STOP
J'(OUT)
CLOCK
y(OUT)
HOLD
OFF(OUT)
SELFTEST
OFF(OUT)
NOTE
2
A
Character, Starting
At The Most
Sig-
nificant
Digit,
Is
Strobed Across The
Display.
The
Characters Displayed
Are
l.2,3.4.5.6.7.8,9.l,l.".r,L,
Blank
And
Period.
Each
Character
Is
Strobed Across
The
Display Twice.
The Decimal
Point
Accompanies
The
Character
On
The
Second
Strobing Sequence.
Also, In
The
Least
Significant
Digit,
The Decimal
Point
Is
Lit
On
Each
Strobe.
The Only
Meaningful
Displaying
Of
The
+
And
Signs
Is
Before
The
Number
0
And
1
Start Their
Display Sequence.
The Time
Required
To
Run
The Complete
Test
Is
3
Minutes.
(
Si^
^
Be
Certain
That;
The
Test
Jumper
On
The
A3
Assem-
bly
Is
Disconnected,
The
Plug
Is
Disconnected
Prom
A1J7
And
All
HP-IB
Switches
Are
Set
To
The
"0
"
position.
Turn The
Instrument
ON.
I
Connect
The
Signature
Analyzer
START
Artd
STOP
Inputs
To A3TP3.
Connect
The
CLOCK
Input
To
A3TP5 And
The
GND
Input
To
The
Chassis.
(See
Note
1
For
Signature
Analyzer Control
Settings.)
I
.
W
1
Press
And
Hold
The
Front
Panel
LOCAL
Key.
•tev:
02C2
The Signature^^
N.
NO
1
^
The
Signature"^
'^YES
.
ls^\.
*\At
A1U61
Pin
2
1H8A?
At
A1U61
Pin
5
1U38?
Gate
AtUdI.
The
Signature
^
1
330H
When
INO
The
Signature
^
NO
1
Input
Latch
A1U51
Or
1
Each
Key
Is
'"n.
Pressed
•Sw
At
A1U51
Pin
6
31CU?
^
*
A1U53.
While
Observing
A1U57
Pin
14 With
The
Signature
Analyzer,
Press
Each
Of
The
Remaining
Keys
Except
The
LINE
And
GUARD
Keys).
rvEs
Inverter
A1U53,
Switches
S1-S6,
S10-S13,
S23-
S28,
Cable
A2W2
Or
A1U57.
I
The
Signature
1
401
F
When
NO
»
/
Is
The
Signature
^
s.
NO ^
Input
Latch
A1U51
Or
The
External
\
1
Trigger Interrupt
^NO
>
The
Signature
^
s^ES
^
Inverter
A1U52
Or
Gates
1
Each
Key
Is
k.
Pressed
At
A1U51
Pin
2
42AP?
Inverter
A1
U50.
1
Signature
At
\
A1U52Pin6
^
•C
At
A1U52
Pin
5
AH2C?
A1U46
Or A1U53.
lYES
lYES
Inverter
A1U50,
Switches
S2,
S7
-S9,
S13,
S15-S22,
Cable
A2W2
Or
A1U57.
The
Signature
At
A1U58
Pins
3,4,6
6464
When
The
LOCAL
Key
Is
Pressed
?
NO
The
Signature
AtA1U58Pin1I
Y
6464
When
fc
Gate
A1US0,
Inverter
The
LOCAL
J
Kev
Is
Pressed
^
A1
U49
Or
AIUSS
fYES
f
At
A1U58
Pin
13
Ino
^
Gates
A1U50
Inverter
6F34Wher\
L
The
LOCAL
Key
.
A1
U49
Or
A1U58
Is
Pressed
7
^
The
Signature
^
N.
NO
/
*
\
The
Signature
^
V.
NO ^
Input
Latch
A1U51
Or
Troubleshooting
Pro-
cedure.
At
A1U60
Pin
1
3818?
At
A1U51
Pin 7
3AAA?
^
9
Inverter
A1
U49.
Connect
A
Clip
Lead
Be-
tween
The
Junction
Of
A1C41 And
A1R43
(Pin
1
Of
A1U61I
And
Chassis
Ground.
Buffer
A1U60
Or
Inverter
A1U49.
I
Do
All
Display
Segments
And
Decimals
Light?
(See
Note
2
For
A
Description
Of The
Display
Operation.)
[YES
Use Schematic No.
10
And
The
Display
Signatures
Table
To
Troubleshoot
The
Display
Circuitry.
The
Display
Circuitry
Appears
To
Be
Working
Correctly,
However,
The
Oper-
ation
Of
Latch
A1
US8 And
Output
Buf-
fers
A1U59 And
U60
Have Not Been
Checked.
i
Go To
The
HP-IB Trou-
bleshooting Procedure,
Figure 8-H-26.
Outguard
Troubleshooting Procedure Diagram,
Display
Circuitry.
8-131/8-132
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