HP 3562A Service Manual page 407

FAULT ISOLATION
Repeat part B.
4.
5 . Use a logic probe or scope to verify the signals in table
TTL level high and TTL level low.
Press the PAUSE/CONT key. ARML should now remain at TTL level high.
6.
If ARML and BFST are operating correctly, start troubleshooting with the
7 .
Filter Controller (go to
Connect A1 TP12 to A
8.
Repeat part B.
9 .
If the instrument now triggers (the waveform may move around on the display),
10.
start troubleshooting wi t h the
1 1 . If the instrument still does not trigger, start troubleshooting with the A
Source (go to
LOOP MODE AND INTERMITTENT FAILURES
7-1 2
Loop mode is used for some signature analysis tests and to find intermittent failures. Many
intermittent failures can be isolated by iunning the self-tests in this mode. When the ioop
mode is activated, the instrument continualiy repeats a test until power is cycled, the
, . • " ,- ..
" . - ' . '
Table 7-1 6 TrIgger SIgnal Check
Signal
Test
Location Name
A1 TP9 B FST
A1 J 1 -83 ARML
8-9).
1 ) 705-2 .
8-5).
.
. . . ' .
. -
TEST ALL
HP-I B DIAG
DFA FUNCTN
FILTER TEST
FFT FUNCTN
FPP FUNCTN
GLOBAL RAM
PROG ROM
SOURCE FUNCTN
LO FUNCTN
FR END FUNCTN '
DIGTAL TEST
#4
In/Out
A1 0ut
A6 Out
Digital Filter Controller (go to
A6
" , - . - - .---- - " � " _ " " " " " .;"��;:;;;: ';,:"': ::o; - -"-=-- " �._."' � "�,, � "',.:,;,,;, , _ . .. -.. ".� ;; . _ ;;;; , � z.. --- -7_ '-""-"--;;';� " ; " C; , = --- ---;;; ;" ' ';:; ' ;;' , ' 7 ' -
MODEL
are toggling between
7-1 6
Digital
A6
8-9).
1 Digital
3562A