SAFETY PRECAUTION 1: An isolation transformer should be connected in the power line between the receiver and the AC line when a service is performed on the primary of the converter transformer of the set. 2: Comply with all caution and safety-related notes provided on the cabinet back, inside the cabinet, on the chassis or the picture tube. 3: When replacing a chassis in the cabinet, always be certain that all the protective devices are installed properly, such as, control knobs, adjustment covers or shields, barriers, isolation resistor-capacitor networks etc. Before returning any television to the customer, the service technician must be sure that it is completely safe to operate without danger of electrical shock.
X-RADIATION PRECAUTION The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is specially constructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous X-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits, take necessary corrective action. Carefully follow the instructions for +B1 volt power supply adjustment, and high voltage adjustment to maintain the high voltage within the specified limits.
PRODUCT SAFETY NOTICE Product safety should be considered when a component replacement is made in any area of a receiver. Components indicated by mark ! in the parts list and the schematic diagram designate components in which safety can be of special significance. It is particularly recommended that only parts designated on the parts list in this manual be used for component replacement designated by mark ! . No deviations from resistance wattage or voltage ratings may be made for replacement items designated by mark ! .
SPECIFICATIONS Power source Television system Colour system Receiving channel AC 220~240V, 50Hz B/G PAL/NTSC4.43 (PAL/NTSC4.43/NTSC3.58 IN AV MODE) UHF: 21~69 VHF: E2-E12 CATV: X, Y, Z, S1-S41 75ohm AV1:CENELEC standard with RGB AV2:CENELEC standard with S-inputs AV3:RCA Terminal, Video and Audio (L/R) 12W x 2 680 x 543 x 442mm 26 Kg
Aerial input impedance AV terminal 21 Pin SCART Terminal Front AV Sound output(Music) Dimensions (WxHxD) Weight
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Outline
Aerial Q242 R G B R
A101 TUNER 20
Q701 Q711 Q721 VIDEO-OUT X132 VIF 6 7 22 21
BLOCK DIAGRAM
Q141 Q243 G Q244 B
CRT
IC201 X131 SIF 9 54
PC-IN Q121~Q133 TV-IN 3 13 8
POWER
TV-OUT
AV1 SIF-IN SC-1
25
26
I2C BUS 35
34
IF/VIDEO/ CHROMA/ DEF 43 39 40
44 15
BLK B G 16 17
BLK R Y SYNC-IN EW-OUT 26 32
C
C-OUT Y-OUT
15 18
SC-2
45
AV2 MONTO -OUT
46
IC801 R 18 41
This is a diagram for all models and therefore differs slightly from the actual block diagram.
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SCL
47
G B
24
IC803 MEMORY
SDA
23
CPU
H-OUT
Refer also to FIG.-2. AV SELECTOR NICAM DECODER Q432
60 61
T451 FBT T431
PROTECT-IN
19
1 - 15 80 - 63
FOCUS SCREEN
IC802 ROM
PCC CONTROL
D.Y V-OUT IC501 6 3
CS CONTROL
V H
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AV Selector NICAM DECODER K12H FRONT-AV FRONT AV3 MONITOR-OUT SC-1 SC-1 (VIDEO/AUDIO-L/R) SC-2 (VIDEO/Y/C/AUDIO-L/R)
CABINET DISASSEMBLY CABINET BACK DISASSEMBLY (A) 1. Remove 7 screws(A). 2. Pull out the cabinet back. (A) (A) (A)
(A) (A)
(A)
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OPTION SETTING [After replacing the Memory IC (IC803)] The memory IC, IC803, stores the option data of TV set and service adjustments data for each circuit, therefore, when the memory IC is replaced, it should be performed following setting and "SERVICE ADJUSTMENT" on next page.
To enter to the Option Mode + Press and hold the F/OK button on the remote control and Pw button on the front panel of the TV. The option window will appear on the screen. Set the options as shown below. OPTION ON-TIMER SORT MODE PLUG & PLAY WELCOME TEXT CODE TEST WSS WIDE OPTION 312/313 Mode AV3 OPTION 3D SURROUND SIF OPTION ADJUST : ON ATS EURO PLUS ON ON OFF ON OFF ALL LANGUAGE OFF ON ON BG ONLY EXIT : RECALL
To set the option mode + Highlight the desired option item by using the Pv or Pw button . + To switch the option mode, use the Volume - (LEFT) or Volume + (RIGHT) button. + The data which is set in the option mode is stored into the memory IC automatically. Following table shows the available option items and default setting mode.
Option Mode ON-TIMER SORT MODE
Mode ON or OFF AUTO TUNE/SORT or AUTO TUNE or ATS EURO PLUS
PLUG & PLAY WELCOME TEXT CODE TEST WSS WIDE OPTION 312/313 Mode AV3 OPTION 3D SURROUND
ON or OFF ON or OFF OFF or ON ON or OFF ON or OFF UK or IRELAND ON or OFF ON or OFF ON or OFF
Plug & Play mode, default "ON" Display message when first set up, default "ON" For factory use, default "OFF" Wide Screen Signaling available, default "ON" Wide mode, default "ON" Destination option , default "UK" Teletext mode, default OFF Front AV disable, default ON 3D Surround available, default ON
Exit from the Service Mode + Press the RECALL button.
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SERVICE ADJUSTMENTS Note: Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and the adjustments are carried out by using the RC handset.
[After replacing the Memory IC (IC803)] The memory IC, IC803, stores the service adjustments data for each circuit, therefore, when the memory IC is replaced, it should be performed "OPTION SETTING" on previous page and the following adjustments, refer to further adjustment on page 14.
WIDE Item No. 1 2 5 6 7 8 10 OSD P V-P P H-P P V-S P H-S P PCC P TRP P CNR Description Vertical Centre Adjustment Horizontal Centre Adjustment Vertical Size Adjustment Horizontal Size Adjustment Pcc Adjustment Trapezoid Distortion Adjustment Corner Adjustment
IMPORTANT NOTICE Do not attempt to adjust service adjustments not listed on the above otherwise it may cause loss of performance and product safety.
To enter to the Service Mode + Press and hold the GREEN button on the remote control and then press the Pw button inside of the door. The adjustment window will appear on the screen.
ADJUST REGULAR WIDE OTHERS TB1251 SELECT: OK EXIT : RECALL
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To select the mode and service item and change data value + Highlight the desired adjustment mode by using the Pv or Pw button and then press the F/OK button. + To select the adjustment item, use the Pv or Pw button. + To change the service data, use the Volume -(LEFT) or Volume + (RIGHT) button. + The data which is set in the service mode is stored into the memory IC automatically. REGULAR mode WIDE mode
REGULAR 1, AGC
38
WIDE 1. P V-P
1F
Adjustment No. and Item name
Adjustment Data
Adjustment No. and Item name
Adjustment Data
Exit from the Service Mode + Press the RECALL button or turn off the TV set by using the Mains switch.
INITIALISATION OF MEMORY IC To initialise the memory IC (IC803), press and hold the NORMAL button on te remote control and then press the Pv button on the front panel of the TV set, and then turn the Mains switch Off and On. Now the initialisation is completed. When initialised the memory IC, all of the setting data (option data and service adjustment data) stored in the IC are reset to the default value. So it is necessary to set the option settings and readjust the service adjustments listed on left page.
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ADJUSTMENTS IMPORTANT NOTICE Do not attempt to adjust the following service adjustments except when adjustments are required in servicing otherwise it may cause loss of performance and product safety. + B VOLTAGE ADJUSTMENT 1. Receive white raster pattern. 2. Set controls to normal. 3. Connect digital voltmetre to test point TP-B and GND. 4. Adjust voltage to 150 ±0.5V by using VR641. DRIVE ADJUSTMENT 6. Select item no.3 "REGULAR 3, GRY" (G-Drive) or 4 "REGULAR 4, GRY" (B-Drive) and adjust both initially to 3F. 7. Change data value of each item by using LEVEL + or LEVEL - button to obtain the proper white balance. PCC ADJUSTMENT AGC ADJUSTMENT 1. Input and tune an RF signal which is UHF to the clearest station. 2. Connect digital voltmetre to test point TP-A and GND. 4. Enter to the service mode and select mode "REGULAR", and select item no.1 "REGULAR 1, AGC". 5. Press the LEVEL+ or LEVEL - button to adjust voltage to be 3.2Vdc. PCC ADJUSTMENT 1. Receive cross hatch pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 7 "WIDE 7.P PCC". 3. Press the LEVEL+ or LEVEL - button to adjust the vertical line to be straight.
FOCUS ADJUSTMENT By using FOCUS VR, adjust focus control for well defined scanning lines. TRAPEZOID ADJUSTMENT 1. Receive cross hatch pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 8 "WIDE 8.P TRP". 3. Press the LEVEL+ or LEVEL - button to correct the trapezum distortion of the vertical line.
GREY SCALE ADJUSTMENT SCREEN ADJUSTMENT 1. Receive black & white pattern. 2. Enter to the service mode and select mode "REGULAR", and select item no. 2 "REGULAR 2, CUT". The horizontal line will appear on the screen. 3. Set the SCREEN VR for one colour to be just visible. 4. Using the numeric buttons shown set each colour to minimum by decreasing to the point where any further decrease resets the adjustment to maximum value. BIAS ADJUSTMENT 5. By using the buttons 1, 2, 4, 5, 7, 8 on the remote control, adjust the line to be white. The key allocation is as follows;
Button No. Operation 1 Increase Red 2 Decrease Red 4 Increase Green 5 Decrease Green 7 Increase Blue 8 Decrease Blue
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CORNER ADJUSTMENT 1. Receive cross hatch pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 10 "WIDE 10.P CNR". 3. Press the LEVEL+ or LEVEL - button to correct the distortion of the vertical line around the corners.
VERTICAL HEIGHT ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 5 "WIDE 5.P V-S. 3. Press the LEVEL+ or LEVEL - button to adjust the vertical height.
HORIZONTAL ADJUSTMENT HORIZONTAL CENTRING ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 2 "WIDE 2.P H-P". 3. Press the LEVEL+ or LEVEL - button to adjust the horizontal centre. HORIZONTAL WIDTH ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item 6 "WIDE 6.P H-W". 3. Press the LEVEL+ or LEVEL - button to adjust the horizontal width. OSD POSITIONING ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "REGULAR", and select item no. 8 "REGULAR 8 OSD". The OSD test bar will appear on the top of screen. 3. Press the LEVEL+ or LEVEL - button to adjust proper OSD positioning.
HIGH-VOLTAGE CONFIRMATION 1. Receive circular pattern and set screen mode to "FULL". 2. Set controls to normal. 3. Connect high-voltage meter to the anode of CRT and GND. 4. Confirm that voltage is 29.0±1.0kV at 1.4mA for 25" model. VERTICAL ADJUSTMENT VERTICAL CENTRING ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 1 "WIDE 1.P V-P". .3 Press the LEVEL+ or LEVEL - button to adjust the vertical centre.
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CPU PORT FUNCTIONS Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Function Name MMU0 MMU3 ADDR10 DSN ADDR11 ADDR9 ADDR8 RWN GND VDD OSC-IN OSC-OUT ADDR13 ADDR14 MMU1 MMU2 MMU4 MMU5 P3.7/CSO P3.6/ASN P3.5 P3.4 P5.1 P5.0 P2.0 P2.3 P2.4 P0.2 P0.1 P0.0 P4.7 P4.6 P4.5 VDD GND P2.1 P2.2 P2.5 P4.4 P4.3 P4.2 P4.1 P4.0 FB B G R V-SYNC H-SYNC WSCR Function External memory 0 External memory 3 Address bus 10 Data Strobe Address bus 11 Address bus 9 Address bus 8 Read Write Strobe Power Supply Clock Input Clock Output Address bus 13 Address bus 14 External memory External memory External memory External memory IN/OUT OUT OUT OUT OUT OUT OUT
1 2 4 5
IN IN OUT OUT OUT OUT OUT OUT OUT IN OUT OUT OUT IN/OUT OUT IN OUT OUT IN OUT IN OUT OUT OUT IN IN IN IN OUT OUT OUT OUT OUT OUT OUT OUT OUT IN IN
Protect - Power failure detect input Dolby CLK(L/L') Dolby SO(Super 3D) PITTARI switch IIC BUS SDA IIC BUS SCL Remote Control Signal Input Power Relay & LED Drive On: L SUB CPU SO Key switch input SUB CPU CLK SUB CPU SI THRESHOLD switch JIMAKU(Caption) switch On-Timer LED Drive ON: L
AV1 Scart function input AV2 Scart function input RF AGC input H-Blank On/Off AMP Mute Mute On: H Dolby RQ H-Blank Phase 50/60Hz output 50Hz: H BLK Output for OSD (Active H) Blue Output for OSD (Active H) Green Output for OSD (Active H) Red Output for OSD (Active H) V-Sync Input (Active H) H-Sync Input (Active H) VPS/WSS Slicer Line PLL