Lan Block - Panasonic BB-HCM381A Service Manual

15.5. LAN BLOCK
Composed of the IC103 (CPU), the IC202 (ETHER-PHY), the CN505 (RJ45 with a built-in transformer).
The transformer in the CN505 provides isolation between the Set and the Ethernet.
The IC103 (CPU) and the IC202 (ETHER-PHY) are connected by a signal called MIIBus and it makes
Ether net data sending and receiving possible.
Sending
The electrical signal sent from the IC103 is converted to Ethernet data at the IC202 and sent from the
CN505 .
Receiving
The Ethernet data received from the CN505 is converted to electrical data at the IC202 and received to
the IC103.
15.6. MOTOR DRIVE BLOCK
15.6.1. PAN Control Block
A PAN motor is performed when CPU mounted on the Main board controls the motor driver IC on this
substrate (IC401).
Moreover, the absolute position of the PAN operation is detected by the photo sensor (IC301) mounted
on this board is realized using the photo sensor (IC301) mounted on this substrate. The detection signal
of a photo sensor is detected level by comparator (IC305) and is input to CPU port.
15.6.2. TILT Control Block
A TILT motor is performed when CPU mounted on the Main board controls the motor driver IC on a TILT
board (IC4).
Moreover, the absolute position of the PAN operation is detected by the photo sensor (IC3) mounted on
this board is realized using the photo sensor (IC3) mounted on this substrate The detection signal of a
photo sensor is detected level by comparator (IC305) and is input to CPU port. At the time of TILT
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