Parker TU2191 Manuale utente
TU2191
Frequency Synthesis Color TV
Maintenance Manual
Table of Contents
I. Introduction of Whole Machine Functions
II. Main Technical Specifications
III. System Constitution Block Diagram
IV. in Assignment Table and IC in Function Description
V. Remote Control art (Key Value Table)
VI. Circuit rinciple Analysis
VII. Main IC Introduction
VIII. Notes for Factory Debugging
I. Introduction of Whole Machine Functions
This device adopts Toshiba’s latest I2C bus control 2-in-1 dedicated decoding chip
TM A8899-XXXX solution for color TVs to provide I2C bus control and frequency synthesis
LL tuning method. Major functions of the device are as follows:
1. FS tuning 45.75M, waveband adjustable;
2. Search programs in radio and cable mode according to US channel table;
3. Automatic program search, frequency tuning and jump setting;
4. Color system: South American system AL-M, AL-N and NTSC-M automatic
recognition;
5. AV channel input, YUV input, multiple input methods can be preset including AV1,
AV2 and DVD (YUV);
6. Direct program selection by number key, or switch in order by up and down key,
program return function;
7. Image mode: personal, dynamic, standard, gentle and single-key selection;
8. Image parameter adjustment: brightness, contrast, color intensity, definition, tone;
9. Mute control: mute when mute ON/OFF, program switching and AV switching;
10. Scheduled power on/off and program reservation;
11. Automatic shutdown when no signal at TV state for 15 minutes;
12. Unique semi-transparent menu display;
13. English, French, Spanish and ortugal menu display;
14. The C U generates 8 self-test signals for geometric distortion adjustment;
15. 50HZ/60HZ auto identification;
16. Child lock; ( ress DIS key for 4 seconds)
17. AV stereo, internal two channel volume control;
18. Main menu with adjustable color and vertical position;
19. No signal factory LOGO setting;
20. TA1304/TA1343 audio plug and play (optional);
22. Multi-purpose controllers (LA7461. TA9028. SC6122) can function at the same
time or separately.
II. Main Technical S ecifications
Item T08
RF system AL-M/N . NTSC-M
Video system AL-M/N . NTSC-M
Or NTSC(3.58)\ NTSC(4.43)
rogram number 181
Antenna input 75Ω Coaxial-cable
Sound output 21” : 2.5W×2
29” : 4W×2
ower input AC90V~260V
ower consumption 21”=85W 29”=100W
Note: The design and specifications of the devise are subject to change without prior notice.
For details, confirm with the real product.
X-RAY RADIATION WARNING:
1. The possible X-ray radiation source I the device is the high voltage part and the
kinescope.
2. In order to guarantee the TV set does not generate X-ray radiation, make sure the
kinescope, high voltage ignition coil and line operate in normal condition without aging.
Note: In order to prevent X-ray radiation, designated kinescope is preferred when replacing
the radiation.
III. System Constitution Block Diagram
Tuner
TU201
AV1
AV2
AN7522/AN17821
A1 A2
S-AV y
Video Audio
S E/W Cb Cr CRT
IV. TMPA8873-XXXX Pin Assignment Table
SAWF
KEY
MATRIX
RECEIVEERMP
TC4053
AV SW
FBT
T471
LA78040/TDA9302
LA78041/TDA8177
TA9028-023/022
LA7461
SC6122
EEPR M
8K bit
2 in Chip
TMPA8873-XXXX
TA1304/TA1343
BTSC
AN5832 or
LA72700 4053
Vout
Hout
SIF
TM A8899-XXXX in and Function Description:
1 C U:
in Assignment Functions
1DVD Output high level in DVD state;
2NO USE
3KEY Key input interface; automatically test Toshiba or Sanyo
key circuit;
4GND MCU digital GND;
5REST Reset pin, when power is connected, MCU resets;
6X-TAC Crystal oscillator connection terminal; required
precision 20 M;
7X-TAC
8TEST Used for MCU factory test, usually grounded;
95V CCD slicer circuit power input (5V);
10 Vss CCD slicer circuit grounding;
54 GND Oscillation circuit grounding terminal;
55 5V Oscillation circuit power; ripple voltage less than 10mV;
56 AV SW Output multiple control levels; TV/AV two or three
states;
57 SDA Serial data output/input;
58 SOL Serial clock pulse input/output;
59 50/60HZ 50HZ is low level; 60HZ is high level;
60 NO USE
61 MUTE Mute level control; mute output high level;
62 NO USE
63 RMT IN Remote signal input;
64 ower ower control, initial low level valid; controlled by F11
ontime item.
Notes for terminal control output state: (0 stands for low level, 1 stands for high level)
in3 indication
Value range for keys: (central value in the range of key voltage is recommended)
KEY Off P+ P- V+ V- MENU TV/AV POWER
Value
range
(Sanyo)
0V ≤1.16
V
≤1.74
V
≤2.45
V
≤3.17
V
≤3.88
V
≤4.60
V
≤5V
Value
range
(Toshiba)
5V 0≤0.4
5V
≤1.02
V
≤1.74
V
≤2.45
V
≤3.17
V
≤3.88
V
≤4.60
V
recision of crystal in6 and in7 is below 20 m.
Supply ripple of in55 is smaller than 0.01V ( ower supply pin of OSD time power
supply pin).
in56 AV/TV switch
TV AV1/S/DVD AV2 External connection method
OPT.2=0 0V 0V 5V Connect pull-up resistor to 5V or
8V.
OPT.2=1;OPT.5=0 0V 2.5V 5V Apply 10K pull-up resistor to 5V,
10K pull-down resistor to the
ground.
OPT.2=1;OPT.5=1 0V 5V 2.5V Apply 10K pull-up resistor to 5V,
connect 10K pull-down resistor to
the ground.
in59 50HZ/60HZ switch
Pin59 NTSC(60HZ) PAL(50HZ)
voltage 5V 0V
in61 Mute 1K pull-up resistor
in64 ower
a) Remote control, IN61\64 waveform relations
Mute settings:
MODE2.0 0 When there is no blue screen,
TV does not mute without
signal.
1 When there is no blue screen,
TV mutes without signal.
MODE2.1 0 When there is no blue screen,
AV mutes without signal.
1 When there is no blue screen,
AV does not mute without signal.
2 Signal processing part:
11 TV GND Analog circuit grounding pin;
12 FB -IN FB (fly back pulse) input terminal;
13 H-out Horizontal driving pulse output terminal;
14 H-AFC Horizontal AFC circuit connection terminal for
external filter; voltage of the terminal controls H-
VCO frequency;
15 V-SAW Connect to external saw wave formation capacitor;
amplitude of the saw wave is controlled by V-AGC
function and kept as a constant;
Power
Mute
Shutdown
Shutdown Boot
Mute
Cold boot Rotary tables
16 V-out Field driving pulse output;
17 H-Vcc Connect to 8V power supply of DEF (deflection
circuit);
18 TV GND Analog circuit grounding pin;
19 Cb Cb component signal input terminal;
20 E/W-OUT E/W signal output terminal;
21 Cr Cr component signal input terminal;
22 EXT-AU1 AUDEO1 input;
23 C-in Color intensity signal input terminal;
24 V2 Video signal CVBS/Y input terminal;
25 ACL ACL filter interface;
26 TV-in TV video signal input terminal;
27 ABC-in ABCL (color saturation, brightness limit) signal
input;
28 Audio-out1 Audio signal output terminal 1, with volume control
function;
29 Audio-out2 Audio signal output terminal 2, with volume control
function;
30 TV-out IF detector signal (full TV signal) output;
31 SIF Sound intermediate frequency output (can have no
connection of peripheral circuit);
32 EXT-AU2 AUDEO2 input;
33 SIF in Input sound second intermediate frequency signal
or horizontal phase correction signal;
34 DC NF Connect to capacitor;
35 IF• LL Connect to IF- LL loop filter;
36 IF-5V Connect to intermediate frequency circuit block
power of 5V;
37 S-Reg Connect to filter capacitor to stabilize internal bias;
38 AU OUT Audio output without volume control;
39 IF AGC Connect to IF AGC filter;
40 IF GND Intermediate frequency grounding terminal;
41 IF in in41 and in42 are two input terminals of the
differential amplifier; input the intermediate
frequency signal from acoustic surface wave filter.
42 IF in
43 RF AGC Output RF-AGC control voltage to high frequency
tuner;
44 Black Det Connect to black level detection filter;
45 Monitor out Output CVBS/SVM signal from this terminal, CVBS/
SVM signal is selected through I²C bus.
46 A C fil Connect to the A C filter of the color decoding
circuit;
47 YC VCC5V1 YC power input;
48 SYNC OUT Compound synchronous signal output;
49 DVCC—3.3V Digital circuit power supply pin;
50 R out Output baseband R signal to video amplifier circuit;
51 G out Output baseband G signal to video amplifier circuit;
52 B out Output baseband B signal to video amplifier circuit;
53 GND Connect to analog grounding line.
V. Remote Control Part (Key Value Table)
Remote control code table Client code (C7-C0)==0E0E
Key
No.
Key icon Function Data
code
(D7-D0)
9028-0E0E
H E X
LC6122
BF40
7461-54H7
H E X
7461-55K2
H E X
K1 1Number key 00000000 00 00 1 1
K2 200000001 01 01 2 2
K3 300000010 02 02 3 3
K4 400000011 03 03 4 4
K5 500000100 04 04 5 5
K6 600000101 05 05 6 6
K7 700000110 06 06 7 7
K8 800000111 07 07 8 8
K9 900001000 08 08 9 9
K10 000001001 09 09 0 0
K11 /00001010 0A 0A 0a 0a
K12 POWER Remote control
power key
00001011 0B 0B 0x12 0x1C
K13 BTSC BTSC key 00001100 0C 0C 0x1f 0x0d
K15 P.P Image mode
selection key
00001110 0E 0E 0x19 0x13
K16 TV/AV TV/AV key 00001111 0F 0F 0x0B 0x0f
K17 P- Channel minus key 00010000 10 10 0x17 0x1a
K18 P+ Channel plus key 00010001 11 11 0x13 0x1b
K19 Vol- Volume minus key 00010010 12 12 0x14 0x1e
K20 Vol+ Volume plus key 00010011 13 13 0x10 0x1f
K21 MUTE Mute key 00010100 14 14 0x16 0x15
K22 S EEP Sleep key 00010101 15 15 0x0f 0x19
K23 DISP/ OCK Display key / child
lock key
00010110 16 16 0x1b 0x14
K24 RECALL Reverse key 00010111 17 17 0x1a 0x0e
K25 UP Up 00011000 18 18 0x0d 16
K26 D WN Down 00011001 19 19 0x15 0x12
K27 EFT Left 00011010 1A 1A 0x18 11
K28 RIGHT Right 00011011 1B 1B 0x1e 0x17
K29 MENU Main menu key 00011100 1C 1C 0x0e 0x10
K30 PIC Image menu key 0001101 1D 1D 0x1c 0x0c
K31 SOUND-MODE Audio mode switch
key
00011110 1E 1E 0x1d 0b
K45 D-MODE Factory mode key 00101100 2C 2C 0x11 0x1d
VI. Circuit Princi le Analysis
1. Tuning program selection circuit:
The frequency synthesis phase-locked-loop ( LL) tunes the I2C bus to control the high
frequency head and some subassembly units. The tuning process is subject to control by
Indice
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