Service manual

Theory
3-3
Touchscreen specifications:
• Minimum object detected: The touchscreen resolution is 0.28 × 0.28 in (7 × 7 mm). This is
the minimum size that can be detected.
• Maximum object detected: The maximum size that can be detected as a single object is
software programmable up to 4.1 × 4.1 in (105 × 105 mm). The
default is 1.7 × 1.7 in (42 × 42 mm). If a larger object touches
the screen, no action is taken.
• Ambient lighting: The touchscreen operates under lighting conditions ranging
from a dimly lit room to bright sunshine. Bright sunshine is
considered to be equivalent to a 75-watt standard incandescent
light bulb held 12 inches (30.45 cm) back from the center of the
touchscreen electronics.
Ultraview 1700 (90387)
A typical 90387 system consists of these major components:
• 90387 monitor
• Display
• 90499 or 90491 module housing(s)
• DC power supply (one or more)
There may also be additional hardware devices present, such as a pointing device (mouse) and
keyboard.
Figure 3-2: Block diagram of a typical 90387 system
I/O and CPU
PCBAs
mouse
keyboard
module
module
DC power
90387
patient data
patient data
network
supply
serial
repeater (2)
to display
2
SDLC
1
to touchscreen
module
module
90499
patient data
patient data
generic
91416-B
display
to touchscreen
with
touch-
screen
display
with
IRTS
IR and
composite sync
SDLC