akira CT-21XF9, Service Manual

Page: 35 / 77

35
Model No: CT-21XF9A
Version 1.0
Digital multimeter (GDM8145)
Resistance for GND
(Rx200KÙ)
Pin Symbol Function Quiescent
state (V) Dynamic
state (V)
Red pen
measure
Black
pen
measure
5 B-Y OUT The output pin for demodu-
lated B-Y signal. Standard
output level is 0.56Vp-p.
B-Y processor has a LPF to
eliminate, the carrier
components.
2.44 2.61 1.0 1.0
6 B-Y
BLACK
CONTROL
The pin, for controlling the
black offset level. Adjusting
range is 30mV.
(This pin should be opened
in the case of using with
TB1231, because TB1231
has an IIC BUS control for
SECAM black alignment)
2.60 2.58 1.0 1.0
7 S-ID
FILTER
The pin for connecting the
SECAM identification filter
capacitor.
A too big capacitor causes a
time delay to get color
signal on a picture, and a
weak RF signal
performance would getting
worth if the capacitor is too
small.
2.07 2.07 1.0 1.0
8 EXT.R-Y
IN
The input pin for external
R-Y signal. The gain of the
internal amplifier is 0dB.
2.59 2.58 1.0 1.0
9 5V V
cc
The V
cc
pin for Y/C pro-
cessing block
5.02 5.02 1.5 1.5
10 EXT.B-Y
IN
The input pin for external
B-Y signal. The gain of the
internal amplifier is 0dB.
2.06 2.58 1.0 1.0
11 GND The GND pin 0 0 0 0
12 FO-ADJ
FILTER
The pin for connecting a ca-
pacitor for automatic adjust-
ing circuit.
Too big capacitor causes a
time delay to get color
signal on a picture, and the
picture noise, flicker would
be appeared if the capacitor
is too small.
2.90 2.76 1.0 1.0