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4-3. Power Supply Reset Process

4-3.

Power Supply Reset Process

In the power supply reset process, power supply reset IC

(RN5VD27A), QL005 is employed.

The reset IC,QL005, develops the reset signal when the

power supply voltage for the microprocessor varies and

becomes lower than the specified voltage, and sends the

signal to the reset terminal of the system microprocessor

(QL001).

4-4. Non-volatile Memory Process

4-4.

Non-volatile Memory Process

In the non-volatile memory process, data reading and

saving for various adjustments are carried out on the

non-volatile memory, QL002 (CAT24C16J).

When the power (AC) is on, all the adjustment data are

read out by the system microprocessor (QL001), then the

previous status is realized.

When saving the data, all the adjustment data are written

by the system microprocessor (QL001), then the current

status is preserved.

However, if a failure (such as power interruption due to

lightning, etc.) occurs during the adjustment data writing,

a data error may occur. If the data is determined as

incorrect, the initial data memorized on the system

microprocessor (QL001) is read out and stored on the

non-volatile memory.

4-5. Remote Control Reception Process

4-5.

Remote Control Reception Process

In the remote control reception process, a remote control

unit (CT-9925) connected to the remote control terminal

emits a remote control signal and a remote control signal

receive section on the front panel, the rear panel or the

camera arm (for TLP711) decodes the signal.

The remote control signals for rear panel and camera

section (for TLP711) are selected by two buffers of

QL003 (74HC14AF) and QL004 (TC74HC125AF).

Then the signal mixed with the remote control signal for

front panel.

Finally, the signal mixed is supplied to the remote control

terminal of the system microprocessor (QL001).

4-6. RS-232C Transmission/Reception

4-6.

RS-232C Transmission/Reception

Process

In the RS-232C reception process, an RS-232C signal

entered through the RS-232C connector (D-SUB 9P) is

decoded in the RS-232C interface (µPD4721) of QL013,

and fed to RXD1 terminal of the system microprocessor

(QL001).

In the RS-232C transmission process, RS-232C signal

developed from TXD0 terminal of the system micropro-

cessor (QL001) is decoded in the RS-232C interface

(µPD4721) of QL013 and fed to the camera micropro-

cessor section.

4-7. Status Read Process

4-7.

Status Read Process

In the status read process, QF202 (M62320FP) and

QF203 (M62320FP) read the key information on the unit

side. QF205 (M62320FP) reads various error informa-

tion.

Table 4-7-1 shows the contents and logic of the status

read signals.

4-8. Status Display Process

4-8.

Status Display Process

In the status display process, two-color lighting LEDs of

DF209 (ON), DF210 (LAMP) and DF211 (TEMP) turn

ON for each kind of status shown in Table 4-8-1 by using

QF203 (M62320FP).

4-9. Various Control Bus Process

4-9.

Various Control Bus Process

In the on-screen display process, control signals are

supplied to the OSD display IC QD018 (CD0022AM),

and the OSD display IC generates character display

signals at the timing determined by VD, HD and clock

supplied to the IC separately.

In addition, control signals are fed to the video, panel,

drive system circuits through I

4-4

C bus.