HP 3562A Service Manual page 396

MO D E L 3562A
8 . I f the S o u rce M a i n test or the D ig ital Sou rce FIE I nterface test fai l s, start
tro u b l eshooti ng with the A1 Digital Sou rce (go to 8-5).
9 . If these tests pass, the A1 D igital Sou rce is probab ly work i ng co rrectly.
B . Use a logic p robe or scope to verify the s i g n a l s i n tab le 7-8 are togg l i n g between TTL
level high and TTL leve l l ow·. If any of the val ues are i n correct, go to 8-8.
Test
Location
A4 TP24
A4 TP1 6
A4 TP1 7
A4 T P1 4
c.
If part B passed, start troub leshootin g with the A30 Analog Sou rce (go to 8-1 7).
D. B u rst Fai l u res
1 . P ress the l i ne switch off.
2. Pl ace the A1 D igital Sou rce on the 03562-66540 extender board . Conn ect the sou rce
output to the channel 1 i n put.
3 . Press the l i ne switch o n .
4 . P ress the H P 3562A keys a s fol lows:
SOU RCE . . . .
. . . � . .
: . � .
. � . .
MEAS
D I S P
5. Refer to f i g u re 7-8 to verify a normal bu rst c h i rp.
Table · 7-8 Source Data
Signal . I n/Out
COS A4 Out
N DAT A4 Out
N LD A4 Out
NDCK A4 Out
. . S O U RC E
L E V E L
.
C H I R P
F I LT R D
I N PUT . . . . . . T I M E
R E C 1
Waveform Probable Cause
N u mber of Fail ure
#6 A4 Local Osci l l ator
#9 A4 Local Osci l l ator
A4 Local Osc i l lator
#1 1
#1 1 A4 Local Os c i l l ator
FAU LT I SO LAT I O N
7-3 3