Ic's Functional Description - Akai 21CTF66BC Service Manual

WHEN THE WHITE BANLENCE IS OK，AJUST G2 VOLTAGE TO THE SCREEN JUST
DISPLAY THE LINE
PRESS V+ KEY WILL BE EXIT THE SC LINE MODE
MENU2
M2
RF.AGC
OSD.V.POS
OSD.H.POS
OSD BRT
SHIPPING
SETUP SELECT 0
Receive 60dBu (1mv)V H color bar signal ， adjust AGC value （ voltage from high to low ） to
picture noise reduce gradually to be just disappeared. Select "shipping", push [V+] [V-]key to
be shipped.

5. IC's functional description

TDA111XX & TDA121XX
SYMBOL
IFVO
VP2
VCCAUDIO
PLLIF
GND2
DECSDEM
FMDEMOUT
EHTO
AGC
IREF
PRESET
29
RF AGC
21 16
Vertical position of OSD（0~63）
43 18
Horizital position of OSD（0~15）
15 Adjust brightness of OSD
Shipping mode
The item setup to 1 and press mute key
will be enter next menu
Function : Main IC
PIN
1 CVBS output(front-end or selected video)
2 Supply VSP(IF and sound) --(5V)
3 Supply VSP(only sound output stage)--(8V)
4 IF-PLL time-constant
5 Ground VSP(IF and sound)
6 Demodulator decoupling capacitor
7 AVL capacitor,second
demodulated sound output
8 EHT feedback input
9 Tuner AGC control output
10 Current reference component
DESCRIPTION
(VARIABLE 0 63)
DESCRIPTION
sound
7
IF output or