HP 3562A Service Manual page 541

MOD E L 3562A
• T u rn on power.
• P ress the 3562A keys as fol l ows:
SPCl FeT N
• Move j u m pers AB] 3 and AB] 4 to the test (T) position.
• Press softkey 56. T h i s i n itiates freerun D5A. The A2 L E Ds shou l d d isplay
hex B B .
• Check the D i s p l ay DMA Add ress Driver output s ignatu res in tab le AB-3.
• If these s ignatu res are correct, proceed to step e, D is p l ay DMA Word
Cou nters. If any s ignatu res are incorrect, check the inputs to U604 and U605
as l i sted in tab le AB-4.
5 E RV I C T E 5T
(52)
Table AB-3
Display Controller Signature
Analysis Test # 1
Signal
le
Name (Pin)
+ 5 TP2
GA1 L U604(9)
GA2L (8)
GA3L (7)
GA4L (6)
(5)
GA5 L
(4)
GA6L
GAll (3)
GA8L (2)
GA9L U605 (9)
GA1 0L (8)
(7)
GA1 1 L
GA1 2 L (6)
GA1 3 L (5)
GA1 4 L (4)
GA1 5 L (3)
GA1 6L (2)
T E 5T
M EMORY
(52)
Signature
0001
U U U P
5554
CCCA
7F7H
5 H20
OAFC
U PFF
52F9
HC88
2 H 71
H PP1
1 292
HAP6
3C97
3826
755P
5 E RV I C E
D 5 P I NT
T E 5T 1 (51 )
B-91