HP 3562A Service Manual page 528

S E RV I C E
5 . ALU Test A
When the ALU Test A key is p ressed, patterns are written to the A L U s (U303, U304,
U305, U307, U308, U31 0) and sh ift PAL (U21 2). The FPP outputs d ata to the gl obal
RAM which is verified by the system
A7 J 2A and A7 J 2 B to test position.
6. ALU Test B
When the ALU Test B key is p ressed, the ALUs are thoro u g h ly tested along with the
carry look-ahead s u bb lock (U21 1 , U 302), the sh ift PAL (U21 2), the status mu ltip lexer
(U201 ), and the seq uencer (U1 03).
D. A7 Signature Analysis Tests
Use these tests to isolate a fa i l u re on the FPP assem bly. O n ly the com ponents in fa i l ing
s u bb l ocks need to be tested. The term 'toggl i ng' refers to a signal conti n u a l l y changing
between TTL l evel h ig h and TTL leve l l ow.
1 . Press the l i n e switch off.
2 . Put a l l j u m pers i n normal (N) position.
3 . Connect the Signatu re An alyzer a s fol lows:
Table A7-2
Signal
G round
Cl ock
Stop
Start
4. Press the l i ne switch on.
5 . Signatu re Analys is Test #1 Setu p:
a. Put j u m per A7 J 2 B i n test position with the powe r on.
b. Press A2 S1 (reset switch on the A2 C P U). The FPP status L E Ds should read
0000 0001 (1
#3 and #4.
8-78
c p u .
A7 Signature Analyzer Setup
Polarity
Positive edge
N egative edge
Positive edge
= =
on, 0 off). If this test is not stable, use signat u re analysis tests
This test can be ru n i n loop mode by setting
#1
Connection
A7 )5-1
A7 ) 5-3
A7 ) 5-4
A7 ) 5-5
MOD E L 3562A