Sony CBK-HD01, Maintenance Manual

Page: 28 / 300

1-18
PDW-700/V1 (E)
1-2-10. LCD System
PD-118 board
The PD-118 board consists of the color LCD panel drive
circuit and the power supply circuit for LCD backlight.
IC1 is the color LCD panel drive IC that contains of the
built-in video signal RGB driver, the timing generator, and
the VCO.
IC1 also contains the serial interface circuit and electronic
potentiometers that are used to establish the various setups
in accordance with the commands from the microprocessor
(IC921) of the FP-157 board.
The RGB video signals that are input to IC1 pin-37
through pin-39 receive contrast adjustment and brightness
adjustment. Then, they pass through the output signal
polarity inversion circuit and are output from IC1 pin-20
through pin-22.
The factory adjustment data is stored in the IC3 EEPROM.
The respective timing signals for driving the LCD panel
are generated from the sync signals that are input to IC1
pin-41 and pin-42.
The operations such as turning off the backlight and
inverting the video signal left to right or up to down are
performed in accordance with the control signals supplied
from the microprocessor (IC921) of the FP-157 board.
1-2-11. Others
CN-3005 board
The VF power supply, light power supply, light switch
signal, and the EEPROM circuit that stores the rely and
system information of the handle switch signal are
included.
Handle switch relay
Input and output the handle switch signal (CN2).
Light switch relay
Relays the light switch signal (CN3).
EEPROM
The system information is written to the EEPROM (IC2)
by the I2C communication to control.
MS-86 board
The MS-86 board is the connector board for the memory
stick connection.
When a memory stick is inserted, the INS signal is set to
LOW so that the camera microprocessor checks capacity
and types of the memory stick inserted.
VCC is supplied to a memory stick only when a memory
stick is inserted or only when accessing a file on a memory
stick. When VCC is supplied, the INS_LED and
ACTIVE_LED (D1) is turned ON.
Access to the memory stick data is processed in the
following order: VCC IN
→
SCLK ON
→
BS Pulse
→
DATA IN/OUT
→
SCLK OFF
→
. .
→
SCLK ON
→
BS ON
→
DATA IN/OUT
→
SCLK OFF
→
. .
→
VCC
OFF.