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Passport 2 Passive Display/Keypad Interface Board
Theory of Operation
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0070-10-0441
Passport 2®/Passport 2 LT™ Service Manual
LCDBIAS Control Circuit
In order to properly turn on the passive display, the board employs a N-Channel FET which is
switched on and off by the LCDBIAS signal from the CPU board. The LCDBIAS signal is
connected to the CPLD for power sequencing. The contrast function is accomplished by
varying a 10K potentiometer.
LCDADJ Control Circuit
The contrast function is accomplished by varying a 10K potentiometer.
Содержание Passport 2
Страница 1: ...Service Manual Passport 2 Passport 2 TM...
Страница 112: ...Parts List Rear Housing Replacement Parts 5 20 0070 10 0441 Passport 2 Passport 2 LT Service Manual...
Страница 116: ...Parts List Rear Housing Replacement Parts 5 24 0070 10 0441 Passport 2 Passport 2 LT Service Manual 12 11 14 4 3 1 2 6 5...
Страница 154: ...Printed in U S A 0070 10 0441 Rev AG December 1 2008...