LifeFitness ELEVATION Series, Service Manual

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10
Theories of Operation
CN 4
MIB THEORy OF OPERATION
There is only one kind of the MIB. It works with both the 7- and the 15” Integrated LCD Screens.
The functions of the MIB include:
1. Process LifePulse
®
(LP) Heart rate signal from sensors
2. receive Telemetry (Polar) Heart rate signal
3. Calculate Heart rate (LP & Polar)
4. Interface to membrane switch keypad
5. respond to Emergency Stop Switch
6. redundant CSAFE ports (for Serial Comm or accessory power)
7. Serial Comm (+5VDC) to GBC / MC
8. Serial Comm (+3.3VDC) to SBC
9. Provide Battery Voltage / switch for Normal Operation
10. Provide Battery Voltage / switch for Sleep Mode
11. Drive speaker (monotone beep)
12. Provides low side drive for all LEDs
13. Drive the LEDs of the Data Display and Keypad
14. Generate Ir commands for Life Fitness Attachable TV
DATA DISPLAy THEORy OF OPERATION (USED ON THE 7-INCH LCD ONLy)
1. Provides 7-segment displays to create 3 data fields of 4, 3, 4 numerals
2. Provides high side drive for all LEDs
ANALOG TUNER AND APPLE AUTHENTICATION THEORy OF OPERATION (USED ON THE 15-INCH LCD ONLy)
The functions provided by the tuner are:
1. right angle adapter to convert F-connector to rCA
2. receive NTSC or PAL/SECAM Analog video via rCA input
3. Implement I2C for NTSC or PAL/SECAM Tuner and provide Video output to SBC via mini coax cable
4. Implement I2C for Micronas Audio processor (which handles the TV/FM Audio output from the Tuner),
and provide Audio output to SBC-e via 34 pin connector
5. Implement I2C for Apple Authentication co-processor
Engage™ and Inspire™ Consoles
M051-00K70-B111