HP 5245L - Page 125

Section
VI
Table 6-7
Table 6-?. Troubleshooting
"Tree".
Read Paragraphs
6-24
through 6-37.
Set
Controls as follows:
IvIODE
.
OUTPUT
.
SENSITTVITY
TIME BASE
FI]NCTION.
INT
STD FREQ
1 MHz
CHECK
.1ps
MANUAL
START
Circled
numbers indicate corresponding waveforms
and
the location
of test
points
on the circuit diagrams.
Observe
Gate
Light
OFF
. Begin
at
2 below
ON
.
Begin at
3
page
6-11
Replace
A22;
Check
Gate
Light
Amplifier
Figure
?-19
Check Gate Light
Ckt
(DS1,
R2, Rg, R4)
Check
A23Q9,
Ql0
and Holdoff MVB
423
Q11, Ql2
Figure 7-20)
Replace A23
on
Extender;
Check
Collector A23Q3
* +12V
Figure
7-20
Check
Sample
Rate
MVB
A23Q3,
Q4, Q6
Not
Counting
OFF
Check
Gate Flip-Flop
A22Q4,Q5
and
42ZQ6
0V
to
+8V
FLASHING
Check Power
A7
Supply
Switch
to
MAI.I
START;
Remove A23,
Observe
Gate
Light
Switch
to Frequency,
I
ps,
Observe
Gate
Figure
Check contacts ASSIA
(F12
&
2) and A3R2
Figure 7-5
Model
5245L
6-10
02349-1