Bosch SHP65TL5UC Repair Instructions page 17

• Any film on the display will affect button capacitance and
operation, so it's critical displays are wiped clean.
• Because
the system
capacitance, it doesn't detect well when gloves are worn.
• A tone sounds whenever a button is touched, confirming a
button has been touched. This tone cannot be disabled
and alerts customers when buttons have been pressed
accidently.
• To be able to turn dishwashers on, displays are always
"live" ("hot"), with a bias voltage of 14.4 VDC. When the
"on/off" button is pressed, the entire operating module
turns on.
HINT: To insure button operation, the user's finger pad
should be used instead of the finger tip. The button needs
a capacitive surface of at least 10mm and the finger pad
provides a much larger surface area.
702_58300000170749_ara_en_c
is based on human finger
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information. Any unauthorized review, use, copying, disclosure, or distribution in any format is prohibited.
CAUTION: Using harsh cleaners can damage capacitive
touch displays.
CAUTION: Not wiping water from capacitive touch
displays can cause buttons to activate. Displays should be
dry-wiped whenever possible. If liquid cleaners are used
or if liquids are spilled on displays, displays must be dried
off immediately afterward.
4.1.3 Piezo-electric (SHE8PT / SHX8PT)
Unlike capacitive touch buttons, these buttons work on a piezo-
electric principle. Piezo-electric materials (e.g certain crystals)
respond to pressure, producing a small electric current when
pressed. Piezo-electric sensors are widely used as pressure
sensors.
Sensors don't get squeezed down, but respond to higher
pressures.
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