Digital Control Block Section - Agilent Technologies 4284A Service Manual

3· 9·2. DIGITAL CONTROL BLOCK SECTION
The digital control functional group consists of the following boards.
A7 Digital Control (CPU)
A9 Keyboard
A 1 0 M emory Card Interface
A20 H P- I B I nterface
A30 H andler I nterface (Option 201 )
A31 H andler I nterface (Option 202)
A40 Scanner I nterface (Option 301 )
A50 Bias Current Interface (Option 002)
The simplified block d iagram is shown below.
SECTION
Figure 3-4. Digital Control Block Diagram
3·23
RAM PJW TEST
ROM CHECK SUM TEST
EEPROM CHECK SUM TEST
LCO
TEST
KEYBOARD TEST
LED TEST
MEMORY CARD RJW TEST
[Q] 0
HANDLER IIF TEST
SCAN'£R !lF
SCANNER IIF EEPROM R!W TEST
COt-I'£CTCA
o
SCANNER IIF VO TEST
� �
T I/F
BIAS CURRENT IIF VO TEST