S E RV I C E
MOD E L 3562A
8-90
B. A8/A1 7 Circuit Block Tests
This section includes three groups of tests which wi l l further isolate failures on the A8
and A 1 7 boards. Some of the tests involve signatu re analysis. The A8 board must be on
an extender card for tests 1 and 3 .
Test 1 , Display Control, tests the D isp lay Direct Memory Access portion of the A8 board.
It verifies correct operation of the add ress and word cou nters, d isplay refresh cou nter,
and the display control ler.
Test 2, Display I nterface, covers problems on the A1 7 board.
Test 3, G lobal RAM, tests operation of the arbiter, refresh address counter, and memory
address sections of A8.
1 . Display Control
a. D isplay Refresh Timer
•
Turn on power.
•
Using an oscilloscope, check the fol lowing clock signals in the Display Refresh
Timer circu its block:
Signal
ClK
TP3
SYNC
b. Display Control ler
Frequency
8 MHz
61 H z
61 Hz
Check TP5, TP6, and T P7 for the waveforms shown i n tab le A8-9 -1 .
c. Display DMA Address Counters and Drivers
The fol lowing signature analysis test verifies correct operation of the Display
DMA circu itry .
•
Con nect the signature analyzer accord ing to tab le A8-2 .
Table A8-2 Display Control/er Signature Analyzer Setup
Signal
Polarity
Connection
G round
AB ) 1 -1
Clock
Negative edge
AB J 1 -3
Stop
Negative edge
AB J 1 -4
Start
Negative edge
AB J 1 -5
Содержание 3562A
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