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NOTE
1
The
Signature
Analyzer
controls
should be
set as
follows for
this test;
LINE
ON
(IN)
START.
(IN)
STOP
y(OUT)
CLOCK.
y(OUT)
HOLD
OFF(OUT)
SELF TEST
OFF
(OUT)
+
5V: 79FU
^
St^
Be
Certain
That:
The
Test
Jumper
On
The
A3
Assem-
bly
is
Disconnected,
The
Plug
Is
Disconnected
Prom
A1J7 And The
HP-IB Ad-
dress
Switches Are
All
Set
To
The "0"
Position.
Turn
The
Instrument
ON.
I
Connect
The
Signature
Analyzer
START
And
STOP
Inputs
To A3TP4.
Connect
The
CLOCK
Input
To
A3TP5 And
The
GNO
Input
To
Chassis,
(See
Note
t
For
Signature
Analyzer Control
Settings.l
I
1
Use the
Signature
Analyzer
1
To
Check The
Signatures
At The
Following
Points:
Location
Signature
A1U34
Pin
2
6P03
Pins
40CF
Pin
9
2A3P
Pin
12
77H9
A1U42
Pin
2
6P52
Pin
S
0A1A
Pin
9
A726
Pin
12
6725
I
Check
The
Signatures
At
I
The
Foilowing
Points:
I
Location
Signature
A1U18
Pin
1
CH2H
Pin
9
91PF
Pin
12
2952
A1U17
Pin
1
1P03
Pin
4
HC7A
Pin
9
1018
Pin
12
390F
Are
The
Signatures
At
The
Following
Points Correct?
A1U19
Pin
2
CH2H
Pin
5
2952
Pin
7
91PF
Pin
10
390
F
A1U20
Pin
2
1018
Pin
5
HC7A
Pin
7
1P03
Pin
10
28PH
f^S
Latch
A1U11
Or
Gate
A1U14.
Output
Letch
A1U16,
yft'
The
Signature
^
SJTES
^
Output
Suffer
A1U16.
Gate
AIU14, Or
Inverter
\
At
A1U14
Pin
1
Gate
A1U14
Or
Inverter
A1U10.
\qOF8?
A1U8.
Bus
Transceiver
A1U9,
Gate
A1U13
Or
Inverter
A1U8.
Output
Suffer
A1U15,
Inverter
AIU3,
Gates
A1U2
0r
U14.
But
Transceivers
A1U6
1
And
U12
Or Output
6uf-
fers
A1U17
And
U18.
1
Output
Buffer
AIU15
Or
Gate
A1U7
Or
A1U13.
Bus
Transceiver
A1U9,
Gate
A1U13
Or
Inverter
A1U10.
Output
Buffer
A1U15,
Inverter
A1U10
Or
Gates
A1U2
Or U7.
^
The
Signature
At
A1U15
Pins
1
K
Output
Buffers
A1 U1
5,
And
5
And
U18
Letch
A1U4
Or
L
A1U18Pin5
00007
^
Inverters
A1 U3, U8.
Inverter
A1U1
Gate A1LI7
Or
Switch
A1S1.
Output
Buffer
A1U16,
Letch
A1U4,
Inverter
A1U3
Or
Gate
A1U7.
I
1
Check
The
Signatures
At
I
The
Followir>g Points:
1
Location
Signature
A1U9
Pin
2
27UU
Pin 7
OOFS
Pin
9
P6U5
Pin
15
709H
Check The
Signatures
At
1
The
Following
Points;
Locat
ion
Signature
;
A1U6
Pin2
69H7
Pin 7
A2C5
Pin
9
67FF
Pin
IS
5122
Yyes
These
^
\N0
J
Signatures
Bus
Transceiver
A1U6.
^^Coffect?/
lYES
I
Check
The
Signatures
At
The
Following
Points:
Location
Signature
I
A1U12
Pin
2
F4P2
Pin 7
509H
Pin
9
P823
Pin
15
40F3
These
^
Latch
A1U11
Or
Inverter
A1U8.
Signatures
Correct?
^
Bus
Transceiver
A1U12
lYES
Use
A
Clip
Lead
To
Short
The IFC
Input
IJ3
Pin
9)
To
Chassis
Ground.
3455
-
0-22
Output
Buffer
A1U16,
Latch
A1U4,
Inverter
A1U3,
Or
Gate
A1U7.
1
Use
The
Clip
Lead
To
Short
The
ATN
Input
(J3
Pin
111
To
Chassis
Ground.
Inverter
A1U3
Or Output
Buffer
A1U16.
Use The
Clip
Lead
To
Short
The
REN
Input
U2
Pin
16)
To
Chassis
Ground.
Inverter
A1U3
Or Output
Buffer
A1U15.
Connect
The
Signature
Analyzer Probe
To A1U16
Pin
5.
Does
The
Probe
Tip Blink
When
The
Ground
Is
Removed
From The
^REN Inpu^
f^S
The
HP-IB
Circuitry
Appears
To
Be
Working
Correctly.
If
The
Problem
Still
Exists:
Check
To
Be
Certain
That
The
Proper
Procedures
linguard
Or
Out-
guard)
Have Been Performed.
Trouble-
shoot
The
ROM
And
Page
Select
Cir-
cuitry
On
The
A3
Assembly
And
The
Circuits
Listed
In
The
Troubleshooting
Procedures
Which
Have
Not
Been
Thoroughly Checked.
Output
Suffer
A1U1B,
Latch
A1U4,
Inverters
A1U3
And
AlUBOr
A1C1
And A1R11.
Figure
8-H-27
Outguard
Troubleshooting Procedure
Diagram.
HP-IB
Circuitry.
8-133/8-134
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