HP 3562A Service Manual page 482

S E RV I C E
3.
To check the H P-I B connector press the fol lowing keys:
SPCl
FCTN
4. U s i n g a s m a l l j u m per, short each of the control p i n s to the H P-I B con nector ground.
When a p i n is grounded, the co rrespo n d i ng p i n shown i n the d is p l ay shou ld have a
dot i n it.
5. If this test passes, the H P-I B con nector is fu nctio n i n g properly.
R emove the fan (MP209) before attempting to remove the
A22 H P-/ B board.
E. Nonvolatile RAM Test
1 . Check the fol lowing for correct value:
location
U21 1 -28
U21 2-28
U21 1 -26
U21 2-26
2. Press the l ine switch off. With the power off, U21 1 -28 shou ld be greater than 3V.
3. Connect the signature an alyzer accord ing to tab le A2-2 .
Check the signatu res of A2 U408-6 and A2 U305-1 5, they shou ld be the same.
4.
F. CPU Signature Analysis Tests
T hese tests are used when the p revious tests fai l to f i n d the problem.
1 . Discon nect power cable.
2. Put the fol lowi ng j u m pers i n test (T) positi on:
A2J4, A2J 5, A2J 6, A2J 7, A2J 9, A2J 1 0, A2 J1 8
3. Put A2 J 1 1 and A2 J 1 4 i n position /12".
8-32
. . . . . . . S E RV I C
. . . . . . . lOO P ON
T E ST
. . . . . . . T E ST
. . . . . . . T E ST
NOTE
Value
� 4.5V
� 4.5V
TTl logic 1
TTl logic 1
PROC
C PU . . . . . . . H P-I B
CO N N EC
MOD E L 3562A