Panasonic EURO 4 Chassis Technical Manual page 29

:
Pin 60 - Keyscan
The local control commands are fed to the
microprocessor IC1101
input via pin 60. This pin is held at 5V due to the
pull-up resistor R1161 which is connected to the 5V
standby supply. This means that this High level is also
maintained during standby condition. Operating
commands fed from the local keys results in varying
voltages being applied to pin 60 which inturn initiates
the varies controls.
Operating commands issued from the local and
remote control are treated with equal status,
:
Pin 61 - AFC
During search mode the microprocessor
detects the AFC voltage input via pin 61, which is fed
from the tuner/I.F. stage.
When the AFC voltage reaches mid level between the
highest and lowest points of its swing, the
microprocessor stops the search operation and holds
the data.
:
Pin 63 - 65 - FLT1-3
FLT3 pin 63 is used for the phase shifting of the VPS
or teletext data.
FLT2 pin 64 PLL filter for VPS slicing.
FLT1 pin 65 PLL filter is used by the teletext slicer.
:
Pin 67 - IRef
This is a reference current for internal PLL.
as serial data. This data is
IC1101
:
Pin 68 - CVBS In
This composite video signal which is input via
pin 68 is used for teletext processing which is carried
out within the microprocessor IC1101.
:
Pin 71 - VProt
This input is used to detect a fault in the deflection
circuit. Where there are no errors a HIGH level is
applied to the base of
transistor being in the OFF state. When
a HIGH level is applied to pin 71 of the
microprocessor IC1101
R457, this HIGH level ensuring the microprocessor
IC1101 is inoperative.
Where an error occurs a LOW level is applied to the
base of transistor
conduct. When transistor
microprocessor IC1101
the TV being switched into standby after a short delay.
:
Pin 74 - RC
The users commands for control of the TV receiver
are applied via the remote control.
These commands from the remote control transmitter
are applied via RPM-637CBRL
remote control receiver and
of IC1101, this command data being in serial format.
29
3DQDVRQLF
Q451 which results in this
Q451
which is fed via resistor
Q451 causing the transistor to
Q451 conducts pin 71 of the
is pulled LOW, this results in
IC1061 ( IC1071
Q1051 ( Q1061
is OFF
) the
) to pin 74