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5-4
5-3. Power Supply Reset Process
In the power supply reset process, power supply reset IC
(RN5VD27A), QL004 is employed.
The reset IC,QL004, 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
(QL002).
5-4. Non-volatile Memory Control Process
In the non-volatile memory process, data reading and
saving for various adjustments are carried out on the
non-volatile memory, QL006 (CAT24C16J).
When the power (AC) is on, all the adjustment data are
read out by the system microprocessor (QL002), then the
previous status is realized.
When saving the data, all the adjustment data are written
by the system microprocessor (QL002), 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 (QL002) is read out and stored on the
non-volatile memory.
5-5. 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 TLP511) decodes the signal.
The remote control signals for rear panel and camera
section (for TLP511) are selected by QL012 buffer
(TC74HC125AF). Then both signals are mixed with the
remote control signal for front panel through QL005
buffer (74HC14AF).
Finally, the signal mixed is supplied to the remote control
terminal of the system microprocessor (QL002).
5-6. RS-232C Transmission/Reception
Process
In the RS-232C transmission/reception process, an RS-
232C signal entered through the RS-232C connector (D-
SUB 9P) is decoded in the RS-232C interface
(mPD4721), and fed to RXD1 terminal of the system
microprocessor (QL002).
In the RS-232C transmission process, RS-232C signal
developed from TXD0 terminal of the system micropro-
cessor (QL002) is decoded in the RS-232C interface
(mPD4721) and fed to the camera microprocessor
section.
5-7. Status Read Process
In the status read process, the following status shown in
the table below are read by QL010 (74HC165AF) and
the error process corresponding to each status is carried
out.
Table 5-7-1 shows the contents of the status read signals
and the logic.
Signal name
Pin No.
QL010
(L)
(H)
A
11
FAN1. ER
Abnormal
Normal
B
12
FAN1. SW
Normal
Abnormal
C
13
FAN2. ER
Abnormal
Normal
D
14
E
3
TEMP1. ER
Normal
Abnormal
F
4
G
5
LAMP. ER
Abnormal
Normal
H
6
MAIN. ER
Abnormal
Normal
Table 5-7-1 The contents of the status read signals and the logic