HP 3562A Service Manual page 539

MO D E L 3S62A
Failure
Type LEDs
-
B7
-
BS
1 9N
2 AN
3 DN
E N
4
O B
S
-
81
-
82
-
83
* I f the problem is after the m u lt i p l exer, the L E Ds w i l l display only one of the two
address bits m u ltiplexed to the affected l ine.
Table AB-l Global RAM Failures
Description
-
Power-u p tests
and c a l ibration
done; keys active
-
Starting G l obal
RAM test
G lobal data G lobal Bus l i ne "N" (G D N )
b u s fai l u re G lobal Bus Transceivers
bit "N" (A8U609, U61 0), other
assembl ies on the global
bus
A8 U21 1 , U1 1 1 , U61 1 ,
Memory address
U61 2
f a i l u re, bit "N"*
Dynamic RAM chip
Repeatable
assoc iated with fai l ing bit,
memory fai l u re,
G DO thr,ough G D1 S
bit "N"
Dynam ic RAM chip
N o n repeatable
memory fai l u re, associated with fai l ing bit,
bit " N " G DO through G D1 S, address
c ircu it, global bus
transceivers
Memory Refresh Tim er,
G l obal RAM
Arbiter, Refresh Address
refresh fai l u re
Cou nter
Memory control circu it,
G lobal RAM a l l
A8 U307, U308
bits failed,
both bytes
A 8 U61 0, U307, U308
G lobal RAM a l l
bits fai led, high
byte
A 8 U609, U307, U308
G l obal RAM a l l
bits fai led, low byte
Probable Fault
Location
-
-
C hapter 7-S-F,
G lobal Bus Test
Table A8-9 #8
B.3.d
-
-
B.3. b, B.3.d,
B.3.e
B.3.b, B.3. c,
B.3.d, B.3.e
Table A8-9 #8, #9
Table A8-9 #8, #9
S E RV I C E
Further Tests
8-89