Disk Drive; Motherboard; Display Board - Keysight Infiniium 9000 Series Service Manual

7
Theory of Operation
+5V
(3%)
Over current
protection
PC
OCx PSWx
mother
USB
b oard
1. 2V/2 .5(dig ital)
Analo g
signal
Digital
sig nal
USB
3. 3V(analog)
3.3V (d igital)
5V(analog )
5 V(digital)
12V(analo g)
Figure 7 Keyboard block diagram with key components

Disk Drive

The hard disk drive is a high-capacity, shock-resistant unit. It is used to store the
oscilloscope's operating system and certain system configuration data. The drive
can also be used to store and recall oscilloscope setups and waveforms.

Motherboard

The motherboard provides all system control and interface functions for the
oscilloscope. It contains a CPU, ROM, and RAM; keyboard and mouse interfaces,
serial and parallel interfaces, CDROM, hard disk drive interface, PCI buses, etc.

Display Board

The Display Board controls the flat-panel display monitor. It translates the video
signals from the motherboard's on-board video system to the Low Voltage
Differential Signal (LVDS) signals that drive the monitor.
140
Keyboard block diagram with key components
version 4.0 04 /24 /2 007
Line pro tection
USB1
USB HUB
ISP1521
I2C GPIO
PCA95 54
+12
+Vp/-Vp
regulator
-12
+Vp -Vp
Rprog
-Vp +Vp offset data
Encoder
Matrix(14)
(4x4)
3.3V
Vref
Reset (RC0 )
Port E
RA3
SPP
RA6/CLK
co ntrol
Micro-controller
(4 bits)
4
PIC18F4455
8
Port D
(8 bits)
RC4
RC5
OSC1
RB0 RB1
SDATA SCL
AD C
. .
I2 C Mux
PCA9544
. .
Autoprobe
Autoprobe
I2C
Interface
Interface
Probe ID
data clock
Rid clo ck Rp rog -12V +12V
Infiniium 9000 Series Oscilloscopes Service Guide
A DC: RA0 , RA1, RA2,
Push Button(22)
Matrix
Caloffset: RB2, RB5,
(3x8)
RB6 , RB7
Scannin g matrix
2 4
FPGA FPGA
XC3S100 XC3S100
Sh ift
regis ter
5 .0V Regul at or
LM1 117 3 .0V
Vo ltage
divider
5.0V
Regul at or
LT 123 6
16bit DAC
2. 5V 3 .3V
.
DAC8534
Vo ltage Vo ltage
divider div ider
Voltage to
To PIC
current
offset
RA5
LED
Matrix
(24
LED)
8 LED
8