HP 3562A Service Manual page 371

FAU LT I SO LAT ION
7 -6 POWER-UP TESTS
Introduction
T h e power-up test proced u re is used when there is no d i s p l ay, i n correct d isplay, or the
i nstrum ent does not respond when a key is pressed . The i n itial cond itions test (paragraph
7-5 ) must be com p l eted before perform i ng the power-up test p roced u re.
T h e power-up tests consist of two sets of tests, low-level and high-leve l. The l ow-leve l
tests exerc ise the A2 System CPU, the A3 Program ROM, the A8 G lobal RAM, the global
bus, and the system bus. Fau lt and pass codes for these core asse m b l ies are d is p l ayed
u s i ng the A2 System CPU test L E Ds (A2 DS3, A2 DS4). The h igh-level power-u p tests exercise
the A9 FFT, A7 FPP, AS DGTL FL TR, and A6 D FL TR CONT asse m b l ies. Fau lts on these
assembl ies are d is p l ayed in the test log (refer to table 7-6 for the description of these
m essages). The i n stru ment performs a c a l i b rati on if the power-up tests pass.
Power-up test fai l u res may be caused by one of the fol lowing cond itions:
1. A core assem bly is defective (A2, A3, A8).
2. An assembly on the system bus or g l obal bus is defective, causing a bus fai l u re.
3. The A1 5 Keyboard system bus i nterface c i rcu its are defective. (T h i s may be the
case when the display is normal after power-u p but the instru ment does not respond
when a key is pressed.)
4. A contro l l i ne is d efective.
Power-Up Test Procedure
To find the cause of the fai l u re, start by referring to tab le 7-4 for the location of the
A2 Test L E Ds and the L E Ds to Hex code trans l at i o n .
A. T o verify t h e core asse m b i ies are operati ng correctiy, perform steps
2 . Press the l i ne sw itch on.
3 . Press the reset switch A2 Si (reset sw itch on A2 CPU).
4. After the reset sw itch is p ressed, the A2 System CPU sho u l d fl ash the test L E D s
(A2 DS3, A2 DS4), I ight the L E Ds one at a ti me, and cyc le through several codes
as l isted i n table 7-3 . When f i n ished, A2 DS1 s h o u l d be off.
7-8
M O D E L 3562A
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