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 D i g i t a l Control (CPU)
A9 K e y b o a r d
A10 M e m o r y Card Interface
A20 H P-IB Interface
A30 H a n d l e r Interface (Option 201)
A31 H a n d l e r Interface (Option 202)
A40 S c a n n e r Interface (Option 301)
A50 B i a s Current Interface (Option 002)
The simplified block diagram is shown below.
ANALOG
NEASLREMENT
SECT ION
A7
System . . 0 1 . 1 R a m
C l o c k
G e n e r a t o r
A90
DISPLAY
J r
CONTRCi.
H
FRONT PA N E L A
0 K E Y CONTROL
MEMORY CARD
.4.1A10
INTERFACE
A20
I - P - I B
_ 0 1 A 3 0 / A31
NADLER I N T E R FA C E
CPTICN 2 0 1 / 2 0 2
H A40
J.. SCANNER I N T E R FA C E
OPTION 3 0 1
H A50
B I A S CLFRENT I / F
CPTICN 0 0 2
Figure 3-4. Digital Control Block Diagram
3-23
RAM FVW TEST
R
ROM CHECK SUM TEST
EEPRR
EEPROM CHECK SUM TEST
A91
LCD TEST
LCD MODU-E
KEYBOARD TEST
9 KEYBOARD
$1.2. 4 L E D s
LED TEST
MEMORY CARD RAY TEST
NEMDRY CARD
F P - I B
CONNECTCR
HANDLER I / F
CONNECTCR
HANDLER I/F TEST
SCANNER I / F
0
CORRECTOR
SCANNER OF EEPROM RAN TEST
SCANNER I/F VO TEST
0
DD
B I A S CURRENT I / F
CONNECTOR
BIAS CURRENT VF I/O TEST
0
— y
Cn
0 C D
CD-
(1)
o
C.c)
= C D
ST
Cl-
CD