HP 3562A Service Manual page 463

MOD E L 3562A
D igital Source FIE I nterface Passes
D igital Sou rce Cou nters Pass or Fail
D igital Source Main Test Fails
B its: 6,9,1 0 and one or more of the
fol lowing bits:
1 1 , 1 2, 1 3, 1 4, 1 5
D igital Source FIE I nterface Fails
D igital Sou rce Main Test Fails
Bits: Multiple F a i l u res
Functions:
No fu nctions operate
C. Multiple Failures Test
T h i s test verifies the DS data bus, the system interface, and the device decoder PAL and
buffer.
1 . Press the l i ne switch off. Place the A1 Digital Sou rce on the 03562-66540 extender board .
2 .
Use a logic probe to verify the system interface l ines are togg l i n g between TTL level
high and TTL level Low. Use the fol lowing test locations:
U404-1 9
U403 p i n s 1 '1 , 1 3 through 1 8
3 . Press the H P 3562A keys a s fo l lows:
SPCL
FCTN
1 -3
Table A Digital Source Failures cont.
Test Results
S E RV I C E
T E ST
Most Likely Cause of Failure
Troubleshoot subblocks in order l isted.
Programmable Counters
Phase Resol ution C i rc u it
T i m ing Control C i rcuit
(Go to part El
OS Data Bus
System I nterface
Device Decoder PAL or Buffer
Programmable Cou nters
Status Registers
Test Registers
Control Registers' Latches
(Go to part Cl
L O O P
O N
T E S T
SO U RC E
S E RV I C E
S O U RC E
MA I N
8-1 3