HP 3562A Service Manual page 380

FA U LT I SOLAT I O N
F. G lobal Bus Test
This test is used for power-u p test code fail u res
a global bus l ine is · defective. For exa m p l e, if N = 5, then a H ex
gl obal bus l ine G D5 is defective.
1 . Press the l i ne switch off.
2. Remove the fol lowing asse m b l ies:
A5 D i g ital F i lter
A7 FPP
A8 G l obal RAM/D isplay
A9 FFT
A1 7 D isplay I nterface
3. Pl ace the A2 System CPU on the 03562A-66540 extender board .
4. Put j umpe rs A2 J 8, A2 J 1 2, A2 J 1 3, and A2 J 1 7 i n test (T) position. This forces the
system CPU, to execute the G l obal RAM test.
5. Press the l i ne switch o n . The L E Ds seq uence shou ld stop on H ex B5 for about 1 .3
m i n utes and then d i s p l ay H ex A F .
6 . I f t h e pass/error code is sti l l 9"N", start tro u b l eshooting with the A 2 System C P U
(go to 8-6).
7. Perform steps (a) through (c) for eac h of the assem b l ies. Replace the assem b l ies
i n the fol lowing order:
A8 G l obal RAM/ D is p l ay
(b) Repl ace the assemb ly.
(c) Press the l i ne switch on. The LI Ds seq uence should read H ex B5 for about
1 . 3 m i n utes and then d is p l ay H ex AF. I f this seque nce i s not d isp layed, start
trou bleshooti ng with this assembly (go Section V I I I ).
8. Put j u m pe rs A2 J 8, A2 J 1 2, A2 J 1 3, and A2 J 1 7 i n normal (N) position.
G . I f the fault has not been found, go to paragraph 7-1 0, "Control L i ne Test" .
A1 7 Display I nterface
A9 FFT
A7 FPP
A5 D i g ital Fi lter
to The error code ind i c ates
90 9F. 9"N"
failure indicates the
95
MO D E L 3562A
7-1 7