Daewoo Dtf 2950 Service Manual

CP-850FX Service Manual 
 
Europe R&D 
10 S19 287.25 160.00 303.25 287.25 
S20 294.25 -  - 294.25 
S21 303.25 303.25 - 303.25 
S22 311.25 311.25 311.25 311.25 
S23 319.25 319.25 319.25 319.25 
S24 327.25 327.25 327.25 327.25 
S25 335.25 335.25 335.25 335.25 
S26 343.25 343.25 343.25 343.25 
S27 351.25 351.25 351.25 351.25 
S28 359.25 359.25 359.25 359.25 
S29 367.25 367.25 367.25 367.25 
S30 375.25 375.25 375.25 375.25 
S31 383.25 383.25 383.25 383.25 
S32 391.25 391.25 391.25 391.25 
S33 399.25 399.25...

CP-850FX Service Manual 
 
Europe R&D 
11 1.3  ATSS SORTING METHOD
 
 
The TV set sweeps all the TV bands from beginning of VHF to end of UHF. The TV controlling 
software for each program checks if a VPS CNI code is transmitted (this system exists for 
German, Swiss and Austrian transmissions). 
If no VPS CNI code is found, then the system checks if a CNI code is transmitted as part of the 
teletext transmission ( Packet 8/30 format 1 and format 2). If such a code ( VPS or teletext ) is 
found and if...

CP-850FX Service Manual 
 
Europe R&D 
12  
Note : If two programs with the same name but a different code are found these two programs 
are listed in group I, II or III . 
 
The sorting order within group II, III, and IV is based on the channel frequency. The program with 
the lowest frequency is allocated the first rank in its group, and so forth until the last program of 
the group which has the highest frequency. 
 
Special case : France 
If France is selected, the TV controlling software first...

CP-850FX Service Manual 
 
Europe R&D 
13 2 SAFETY INSTRUCTION
 
WARNING: Only competent service personnel may carry out work involving the testing or repair 
of this equipment. 
 
X-RAY RADIATION PRECAUTION 
 
1.  Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid 
such hazards, the high voltage must not exceed the specified limit. The nominal value of the high 
voltage of this receiver is 25-26 KV (20”-21”) or  26 KV (25” - 28”) at max beam current. The high 
voltage...

CP-850FX Service Manual 
 
Europe R&D 
14 3 ALIGNMENT INSTRUCTIONS
 
3.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE
 
To switch the TV set into service mode please see instruction below. 
1 - Select PR. number 91 
2 - Adjust sharpness to minimum and exit all menus. 
3 – Within 2 seconds press the key sequence : RED - GREEN - menu 
 
The software version is displayed beside the word Service, e.g. “SERVICE V1.00”. 
To exit SERVICE menu press menu key or Std By key. 
3.2 SERVICE MODE NAVIGATION
 
Pr...

CP-850FX Service Manual 
 
Europe R&D 
15 3.3.1 OPTION 1 
 B7 B6 B5 B4 B3 B2 B1 B0 
1 
TOP 
Teletext 
OFF 
FASTEXT 
(FLOF) 
OFF 
TUBE 
4:3 
Headphone 
Volume/Bal
ance control 
OFF 
Dolby 
Virtual 
OFF 
SVHS3 
disable 
0 
TOP 
Teletext 
ON 
FASTEXT 
(FLOF) 
ON 
TUBE 
16:9 
Headphone 
Volume/Bal
ance control 
ON 
Dolby 
Virtual 
ON 
SVHS3 
enable 
Tuner options 
 
00 = Philips 
01 = not used 
10 = ALPS 
11 = PARTSNIC 
3.3.2 OPTION 2 
 B7 B6 B5 B4 B3 B2 B1 B0 
1 
JVC 
remote 
control 
AVL 
control 
OFF...

CP-850FX Service Manual 
 
Europe R&D 
16 3.4  TV SET ALIGNMENT
 
3.4.1  LOCAL OSCILLATOR ALIGNMENT 
Tune a colour bar pattern. The frequency of the signal carrier must be accurate ( Max +/- 10KHz 
deviation from the nominal channel frequency). 
Find “AFT” item in service mode. 
Adjust the coil L150 to bring the cursor to central position : 32. 
3.4.2 G2 ALIGNMENT 
- Tune a colour bar pattern. 
- Find the “G2 – SCREEN” item in service mode. 
- Adjust screen volume ( on FBT ) to bring the cursor to...

CP-850FX Service Manual 
 
Europe R&D 
17
 
HOR WIDTH 
adjust for 93% overscan. 
 
  
PARABOLA 
 
CORNER B & CORNER T 
 
 
 
EW TRAPEZ 
3.4.8 AGC 
- Make sure option bits are correct for the tuner fitted on the chassis (See above how to change 
option bits). 
- Adjust the antenna signal level at 62 dBμV± 1 
- Tune a colour bar pattern. 
- Find the “AGC” item in service mode. 
- Press the key “OK” on the remote keypad and wait until AGC level stabilise to the optimum 
value. 
- Alternatively, use “Vol...

CP-850FX Service Manual 
 
Europe R&D 
18 4 IC DESCRIPTION
 
4.1  TELETEXT DECODER WITH EMBEDDED 8-BIT CONTROLLER
 
TVText Pro is a 8-bit controller based on a enhanced 8051 core with embedded teletext, On 
screen Display and TV controller functions. 
4.1.1  BLOCK DIAGRAM OF THE SDA55XX 
 
 
 
4.1.2 DESCRIPTION 
The SDA 55xx is a single chip teletext decoder for decoding World System Teletext data as well 
as Video Programming System (VPS), Program Delivery Control (PDC), and Wide Screen 
Signalling...

CP-850FX Service Manual 
 
Europe R&D 
19 interface and receives/transmits data via I 2 C-firmware user-interface. The slicer combined with 
dedicated hardware stores TTX data in a VBI buffer of 1 Kilobyte. The Microcontroller firmware 
performs all the acquisition tasks (hamming-and parity-checks, page search and evaluation of 
header control bits) once per field. Additionally, the firmware can provide high-end Teletext-
features like Packet-26-handling, FLOF, TOP and list-pages. 
 
4.1.3  IC MARKING...