Panasonic BB-HCM580CE (serv.man2) Service Manual ▷ View online
13
BB-HCM580CE
[LENS drive motor control]
The CPU controls the driver (IC901) for the LENS motor drive that is mounted on the LENS board by the three-wire serial sig-
nals (SDI, SCL, and MO_LD) and by the motor drive timing signal (VD_MOT). The output current, pulse period, and the number
of pulses are also set up by the driver. This LENS motor drive driver (IC901) controls both of the ZOOM lens drive and FOCUS
lens drive motors using the micro step drive control method. The power supply to drive the motors is +5.7V that is supplied by
the DC-DC converter circuit on the TILT board via the VIDEO board.
nals (SDI, SCL, and MO_LD) and by the motor drive timing signal (VD_MOT). The output current, pulse period, and the number
of pulses are also set up by the driver. This LENS motor drive driver (IC901) controls both of the ZOOM lens drive and FOCUS
lens drive motors using the micro step drive control method. The power supply to drive the motors is +5.7V that is supplied by
the DC-DC converter circuit on the TILT board via the VIDEO board.
[IRIS drive control]
The IRIS has been adjusted in the factory and the adjusted values are saved in the Flash memory (IC104) on the CPU board. In
the initialization process when the power is turned ON, the adjusted values are written in the DA converter (IC903) on the LENS
board. No subsequent process to write the data into the DA converter will be carried out. Once the adjusted values are written in
the DA converter, the output voltage from the DA converter can be controlled. The DA output is applied in the IRIS control cir-
cuit. The IRIS unit of the lens is controlled with the method called the Pulse Width Modulation (PWM).
the initialization process when the power is turned ON, the adjusted values are written in the DA converter (IC903) on the LENS
board. No subsequent process to write the data into the DA converter will be carried out. Once the adjusted values are written in
the DA converter, the output voltage from the DA converter can be controlled. The DA output is applied in the IRIS control cir-
cuit. The IRIS unit of the lens is controlled with the method called the Pulse Width Modulation (PWM).
[LED control]
Red and green LEDs are used in the LED (LED901) indicator. LEDs are turned on, blinked or turned off by turning ON/OFF the
transistors (Q901 and Q902) that are connected to the LEDs. The transistors are turned ON/OFF from the output port of the
CPU (IC102) on the CPU board.
transistors (Q901 and Q902) that are connected to the LEDs. The transistors are turned ON/OFF from the output port of the
CPU (IC102) on the CPU board.
LED_R
LED_G
Q901
Q902
LED COLOR
H
H
ON
ON
Orange
H
L
ON
OFF
Red
L
H
OFF
ON
Green
L
L
OFF
OFF
OFF the light
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BB-HCM580CE
4.3.
Image Compression Block
• Image compression (JPEG/MPEG-4 encode) function, memory control unit (MCU), ETHERNET MAC, and SD card controller
are built into IC102.
• Picture data input from the camera block is captured in SDRAM (1).
• Captured image data is input to the ZOM block, where the scaling of the image size is done, (an image size of 640 x 480, 320 x
• Captured image data is input to the ZOM block, where the scaling of the image size is done, (an image size of 640 x 480, 320 x
240, or 192 x 177 is generated from the one with the size of 1280 x 1024, or an image size of 320 x 240 or 192 x 177 from the
one with the size of 640 x 480), and is stored in SDRAM again (2).
one with the size of 640 x 480), and is stored in SDRAM again (2).
• The scaled image data is input to the JPEG/MPEG-4 encode section of IC102, and the image is compressed. The compressed
image data is stored in SDRAM again (3).
• After CPU processed the compressed image data for a communication protocol, the data is forwarded to the network via ETH-
ERNET MAC and ETHERNET PHY. And the image data of post-compression is processed for a file and is recorded on the SD
card.
card.
• As for the video output, the captured image data is scaled to a size of NTSC or PAL at the ZOM block, and then it is output from
VIDEO OUT and DAC sections as an analog video signal.
• This analog video signal is amplified by the video amplifier (IC109) and output from CN604 on the IO board with the output
impedance of 75Ω.
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BB-HCM580CE
4.4.
LAN Block
Composed of ETHERNET MAC Block inside of the IC102 and the IC105 (ETHER-PHY) on the CPU board, and the T601
(Transformer) and the CN605 (RJ45 jack) on the IO Board.
The T601 (Transformer) obtains isolation between the Set and the Ethernet.
ETHERNET MAC and the IC105 (ETHER-PHY) are connected by a signal called MIIBus and it makes Ether net data sending
and receiving possible.
Sending
The communication data sent from the IC102 is converted to Ethernet signal (100Base-Tx, 10Base-T) at the IC105 and sent
from the CN605 through the T601.
(Transformer) and the CN605 (RJ45 jack) on the IO Board.
The T601 (Transformer) obtains isolation between the Set and the Ethernet.
ETHERNET MAC and the IC105 (ETHER-PHY) are connected by a signal called MIIBus and it makes Ether net data sending
and receiving possible.
Sending
The communication data sent from the IC102 is converted to Ethernet signal (100Base-Tx, 10Base-T) at the IC105 and sent
from the CN605 through the T601.
Receiving
The Ethernet signal received from the CN605 is converted to the communication data at the IC105 and received to the IC102.
The Ethernet signal received from the CN605 is converted to the communication data at the IC105 and received to the IC102.
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BB-HCM580CE
4.5.
Pan and Tilt Motor Control Circuit
PAN drive motor and TILT drive motor are driven under the control from the CPU (IC102).
[PAN drive control]
[PAN drive control]
PAN drive control circuit is mounted on the CPU board.
For the PAN drive control, the CPU (IC102) generates a variety of pulses that are applied to the PAN motor diver (IC120) to con-
trol the speed and direction of the rotation of the motor. In addition, current to the PAN motor is controlled by applying the refer-
ence voltage to the motor driver (IC120). The reference voltage is generated based on the DA output from the DA converter
(IC119) that is connected to the data bus of the CPU (IC102) and the current to the PAN motor is used to control the torque of
the PAN motor and to micro-step drive (2W1-2) the motor. The micro step drive is the method to increase the rotational resolu-
tion of the motor, and with this method of the micro step drive the accuracy of 0.9375
For the PAN drive control, the CPU (IC102) generates a variety of pulses that are applied to the PAN motor diver (IC120) to con-
trol the speed and direction of the rotation of the motor. In addition, current to the PAN motor is controlled by applying the refer-
ence voltage to the motor driver (IC120). The reference voltage is generated based on the DA output from the DA converter
(IC119) that is connected to the data bus of the CPU (IC102) and the current to the PAN motor is used to control the torque of
the PAN motor and to micro-step drive (2W1-2) the motor. The micro step drive is the method to increase the rotational resolu-
tion of the motor, and with this method of the micro step drive the accuracy of 0.9375
° (7.5°/8) has been achieved for the PAN
motor minimum step angle of 7.5
°. The motor control signal from the motor driver (IC120) for the PAN drive is applied to the PAN
drive motor via the 4-pin connector (CN104).
In the position control, the home position for the PAN control is detected by the PAN sensor (IC116; photo coupler) when the
power is turned on, and then the position is open-loop controlled by the software. In order to remove variations among products,
the output from the PAN sensor (IC116) is input into the comparator (IC107) and the output (PAN_S) from the comparator is
detected in the CPU (IC102).
The motor drive power supply (VM voltage) for the PAN drive motor driver (IC120) is +12V that is supplied from the IO board.
In the position control, the home position for the PAN control is detected by the PAN sensor (IC116; photo coupler) when the
power is turned on, and then the position is open-loop controlled by the software. In order to remove variations among products,
the output from the PAN sensor (IC116) is input into the comparator (IC107) and the output (PAN_S) from the comparator is
detected in the CPU (IC102).
The motor drive power supply (VM voltage) for the PAN drive motor driver (IC120) is +12V that is supplied from the IO board.
[TILT drive control]
The TILT drive control circuit is mounted on the TILT board.
The TILT motor driver (IC954) and TILT sensor (IC952) are mounted on the CPU board.
For the TILT drive control, the CPU (IC102) on the CPU board generates a variety of pulses that are applied to the TILT motor
driver (IC954) to control the speed and direction of the rotation of the motor. Since the TILT drive control does not require such
rotational resolution as required in the PAN drive control, but the “W1-2” control method is used. In the TILT drive unit, the accu-
racy of 1.875
The TILT motor driver (IC954) and TILT sensor (IC952) are mounted on the CPU board.
For the TILT drive control, the CPU (IC102) on the CPU board generates a variety of pulses that are applied to the TILT motor
driver (IC954) to control the speed and direction of the rotation of the motor. Since the TILT drive control does not require such
rotational resolution as required in the PAN drive control, but the “W1-2” control method is used. In the TILT drive unit, the accu-
racy of 1.875
° (7.5°/4) has been achieved for the TILT motor minimum step angle of 7.5°. The motor control signal from the
motor driver (IC954) for the TILT drive is applied to the TILT drive motor via the 4-pin connector (CN953).
In the position control, the home position for the TILT control is detected by the TILT sensor (IC952; photo coupler) when the
power is turned on, and then the position is open-loop controlled by the software. In order to remove variations among products,
the output from the TILT sensor (IC952) is input into the comparator (IC107) on the CPU board and the output (TILT_S) from the
comparator is detected in the CPU (IC102).
The motor drive power supply (VM voltage) for the TILT drive motor driver (IC954) is +12V that is supplied from the IO board via
the CPU board.
In the position control, the home position for the TILT control is detected by the TILT sensor (IC952; photo coupler) when the
power is turned on, and then the position is open-loop controlled by the software. In order to remove variations among products,
the output from the TILT sensor (IC952) is input into the comparator (IC107) on the CPU board and the output (TILT_S) from the
comparator is detected in the CPU (IC102).
The motor drive power supply (VM voltage) for the TILT drive motor driver (IC954) is +12V that is supplied from the IO board via
the CPU board.
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