Tektronix 1502C - Page 93

Circuit Descriptions
5–26
1502C MTDR Service Manual
Push Button Switches
Rotary Binary Switches
Resistive Shaft Encoder
MENU
VIEW INPUT
VIEW STORE
VIEW DIFF
STORE
IMPEDANCE
NOISE FILTER
FEET/DIV
PULSEWIDTH
Vp
HORIZONTAL
POSITION
VERTICAL
POSITION
VERTICAL
SCALE
50 - Pin
Connector
Data Bus
Address/
Control Bus
From Temp Sensors
To LCD Heater
To LCD Drivers
To EL Backlight
50 - Pin
Connector
LCD Heater
Drive Circuitry
LCD Drive
Voltage
Circuitry
EL
Switching
Circuitry
EL
Power
Supply
ANALOG-DIGITAL-CONVERTER
M
U
L
T
I
P
L
E
X
E
R
S
L
A
T
C
H
E
S
Figure 5–13: Front Panel Block Diagram
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