HP 3562A Service Manual page 398

MOD E L 3562A
Perform ste ps 1 through 7:
A.
1 . P ress the l i ne switch off.
2. P l ace the A2 System C P U o n the 03562-66540 extender board .
3. Press the l i ne switch on.
4. Verify the R E S E T L l ine is a T T L level high at test po i nt A2 U604-1 6.
5. After the power-up sequence is com pleted, use a logic probe to verify the s i g n a l s
i n tab le 7-1 0 are togg l i n g between T T L level high a n d T T L l eve l low.
6. If a l i ne is TTL level stays l ow, go to part B .
7. U s e tab l e 7-1 0 to determ i n e which assem bly is defective.
Test
Location
A2 USOO-1
A2 USOO-2
A2 USOO-3
A2 USOO-1 3
Press any key to toggle K Y B R D L.
A2 U604-3
A 2 U604-S
A2 U604-7
A 2 U604-1 2
A 2 U604-1 4
A 2 USOB-4
A 2 P1 -1 1
A 2 U604-1 B
A2 USOB-2
A2 USOB-S
Table 7-1 0 Control Lines Set #1
Signal In/Out
I RQT4L A9 Out
I RQTS L A6 Out
I RQT6L AB Out
I RQT3L
A7 Out
KY B R D L A 2 Out
ASL A2 Out
W R I T E L A 2 Out
L D S L A2 Out
V I O L
A2 Out
DTACK L A2 I n
E N B L L
A2 Out
VMAL A2 Out
VPAL A4 Out
MR6BL A2 Out
FA U LT I SO LAT I O N
Probable Causes
of Failure
A2 CPU, A9 FFT
A2 CPU, A6 D F L TR CONT
A2 CPU, AB RAM
A2 CPU, A7 FPP
A2 C P U, A1 S K EY B D
Any assembly o n the system bus:
A2 CPU
A1 DGTL S C E
A6 D F LT R CONT
A7 FPP
AB RAM/DS P L
A 9 FFP
A1 S K E Y B D
A 2 CPU, A 1 DGTL S C E ,
A3 ROM, A 4 LO
A2 CPU, A4 LO
A2 CPU, A4 LO
A2 C P U, AB RAM
7-3 5