HP 3562A Service Manual page 397

FAU LT I SOLAT I O N
F I L T
7 . 9 5
1 . 9 9
/0
R e a l
v
- 7 . 9 5
F x d
FIgure 7-8 Burst ChIrp
6. Use a scope and logic probe to verify the s ignals in table 7-9 are toggl i n g between
TTL level high and TTL level l ow. If any of the values are i n co rrect, go to Section
V I I I .
Test
Location
A1 J 701-3
A1 ) 701 -1
A1 J 1 -1
A1 ) 1 -5
If NCLK fa ils, NSYNC also fails. Start tro ubleshooting with the A 1
Digital Source (go to 8-5).
7. I f the s i g n a l s i n tab le 7-9 are correct, start trou bleshooti ng with the A30 A n a log
S o u rce (go to 8-1 7 ) .
7-1 0 CONTROL L I N E TEST
Co ntro l l i ne fai l u res can cause false error codes and m u lti ple fa i l u re m essages. T h i s
proced u re determ ines if a control l i n e is defective.
7-34
T I M E 1
i V
Tabl� 7-9
Signal
NCLK
N SYNC
DACDAT
B U RST E N
Burst Mode SIgnals
Waveform
In/Out N u mber
A1 0ut #1 3
A4 Out #1 3
-
A1 0ut
A1 0ut
NOTE
MOD E L 3562A
Probable Cause
of Failure
A1 D igital Source
A4 Local Osc i l l ator
A1 D igital So urce
A1 Digital Source