FINLUX FINLUX 21S20, 21S22, 25S22, 28C26, 28S22, 5128 UNIVERSUM FT7126, FT71262, FT71263, FT7128, FT7128A, FT7129 Service manual & schematics

Page 1

THORN UK

Service Information

TUK Part No. TP57007

For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree, Rd, Chinnor Oxon OX9 4QY Tel:- 01844-351694 Fax:- 01844-352554 Email:- enquiries@mauritron.co.uk

Page 2

REMOTE CONTROL HAND UNIT

All installation operations of the receiver as well as the daily use are controlled by the remote control hand unit. It is also possible to use the basic control functions of the receiver without remote control hand unit using the local control unit (see chapter "LOCAL CONTROL UNIT").

Two pcs. of 1,5 V batteries type UM3 (AAA) are required. The batteries should last about one year.

For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd, Chinnor Oxon OX9 4QY Tel: 01844-351694 Fax: 01844-352554 Email: enquiries@mauritron.co.uk

1. No function
2. Standby button
3. Number buttons 1 9
4. Instant sound mute button
5. 0/E. button
6. Clock button / broadcast identifier
7. Cursor button upwards, Step forward button
8. Cursor button to left, sound volume control (-)
9. i-button; ideal picture button (keep depressed 2 ... 3 seconds)
10. Cursor button to right, sound volume control (+)
11. Cursor button downwards, Step backward button
12. TV mode/switching the receiver on from standby
13. No function
14. Teletext button
15. Picture controls
16. Sound controls
17. EXTRA button
18. Coloured buttons
19. HOLD button (Teletext)
20. Background for display of time and programme number
21. Enlarging of teletext page
22. Programming button

Page 3

PROGRAMMING THE TV-CHANNELS INTO MEMORY LOCATIONS

The stations broadcast their television programmes on different channels, to which your TV set must be tuned. E.g. in some area the BBC1 is transmitted on channel 31. This set includes 47 memory location numbers to which you can programme 47 different TV programmes from TV channels 21 ... 69 UHF.

When using the direct programming of channels, always enter the channel number three-numbered beginning with a

FUNCTION

HAND UNIT

ON SCREEN DISPLAY


art programming by
and programming by
essing the PRG button
g and this buildin.

s р

	Edit
Pr	Station Pr Station	P٣	Station
234567	021 17 18 19 20 21 22 23	334 356 37 38 37 38 39

You can select the desired programme memory location using the cursor buttons (upwards and downwards).

NB! Normally no fine tuning is needed.

Page 4

FUNCTION		ON SCREEN DISPLAY
5 Fine tune using the cursor button (left - or right +).		F-Tune F-Tune >>> Store
6 Store the channel into memory by pressing the blue button.	HOLD INV SIZE	Working F-Tune >>> #@Storess

After storing the receiver selects the next memory locations automatically, if it is free. If not, select the next memory location with the cursor button (upwards).

All memory locations 1 ... 47 can be programmed as above.

Switch back to normal TV reception by pressing the TV button.

For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd, Chinnor Oxon OX9 4QY Tel:- 01844-351694 Fax:- 01844-352554 Email:- enquiries@mauritron.co.uk

PROGRAMMING THE MEMORY LOCATION RESERVED FOR VIDEO RECORDER OR SATELLITE RECEIVER

Any of the memory locations 1 ... 47 can be reserved for a videorecorder or a satellite receiver connected via the aerial connector. E.g. the memory location 7 is programmed for videorecorder as follows:

FUNCTION	HAND UNIT		ON	SCR	EEN DISP	PLAY
Start programming by pressing the PRG button.	HOLD INV SIZE PRG	Pr 1233456	Station 025 027 031	Pr 17 18 19 20 21 22	Station	Pr 33 34 35 36 37 38	Station
2 Select the programme me- mory location using the cursor buttons, e.g. 7.		7 Pr 1 2 3	Station 025 027 031	23 Pr 17 18 19	Station	39 Pr 33 34 35	Station
		4 5 6 2		20 21 22 23		36 37 38 39

Load a prerecorded tape into the video recorder and start the playback. (For satellite receiver: Start the satellite receiver and select a satellite programme.)

Page 5

TIME DISPLAY

The real time is displayed on the screen when pressing the clock button.

First appear the programme number and time in the upper right corner of the screen. In a while the programme number disappears.

You can select the black background for the display by pressing the INV button. The background will disappear when pressing the INV button again. The time display disappears when pressing the clock button. Note: The time display is visible only if the TV channel includes teletext service.

Page 6

POWER SUPPLY BLOCK DIAGRAM

Page 7

Page 8

Page 9

POWER SUPPLY CIRCUIT DIAGRAM

Page 10

CIRCUIT DIAGRAM

Page 11

MAIN BLOCK DIAGRAM

Page 12

Page 13

Page 14

U POWER SUPPLY BLOCK

Supply voltage

1. Set brightness and contrast to normal level. Connect an universal voltmeter to the cathode of Du1.
2. Adjust with Pu1 the DC voltage for +142V (±1 V).

Z HORIZONTAL DEFLECTION BLOCK

Horizontal linearity

Adjust with Lz1.

Focusing

• Set brightness and contrast to normal level. Use cross hatch pattern and adjust the picture for optimum resolution.

Screen grid voltage

See RGB gain and black level adjustments.

Page 15

SERVICE ADJUSTMENTS

WER SUPPLY BLOCK

voltage ghtness and contrast to normal level. Connect versal voltmeter to the cathode of Du1. with Pu1 the DC voltage for +142V (±1 V).

RIZONTAL DEFLECTION BLOCK

al linearity with Lz1.

p ghtness and contrast to normal level. Use atch pattern and adjust the picture for optimum ihn

rid voltage B gain and black level adjustments.

OUTPUT CIRCUIT DIAGRAM

Χ RASTER CORRECTION BLOCK

Picture width Adjust with Px1.

E-W amplitude Adjust with Px2.

Trapezoidal correction Adjust with Px3.

Κ VERTICAL DEFLECTION BLOCK

Picture height Adjust with Pk2.

Vertical linearity Adjust with Pk1

H----) R-level

G-level B-leve] 120

Page 16

NTS

VIDEO OUTPUT CIRCUIT DIAGRA

RASTER CORRECTION BLOCK

ure width djust with Px1.

amplitude djust with Px2.

ezoidal correction

VERTICAL DEFLECTION BLOCK

ure height just with Pk2.

ical linearity

HORIZONTAL (Line) OUTPUT CIRCUI

Page 17

OUTPUT CIRCUIT DIAGRAM

Page 18

Page 19

Page 20

Page 21

ZDU2

Page 22

NFIGURATION AND FAULT DIAGNOSIS FOR CIRCUITS CONNECTED THE IIC-BUS

essing 04 in the service mode, the processor checks all possible addresses of bus driven circuits and shows und addresses on the screen. The set must be configurated after adding or removing some options.

Reg	Configuration
04	22
5W	Bus Addresses
1 0	4E 22 84 42 CO AO A2

d configuration value is shown on the screen until new configuration is stored into NVM by pressing the blue. The set takes the new configuration in use only after reseting the set with the mains switch. The configuration s also as a fault diagnosis system.

ddress	Circuit
0	uP software version_ICc4 (83C154D)
22	IVT Teletext, ICt2 (SAA5246A)
4E	Nicam Decoder / Micronas, ICr1 (MAS7D102)
8 4	Nicam Decoder / Toshiba, (TB1204)
84	Sound Processor, ICp1 (TDA6612)
4 2	D/A Converter, ICb3 (TDA8444)
¢o	Hyperband Tuner PLL (TSA5510)
¢6	LIHE Tuper PLL (TSA5510)

Page 23

ENTS VIA IIC DATA BUS

e TV button or the service mode again by pressing the EXTRA de by reseting the set with the mains switch.

RVICE MODE

f the hand unit are used for service adjustments. Analog controls al controls don't function.


adjust-	Reg	Min	Value	Max

CONFIGURATION AND FAULT DIAGN TO THE IIC-BUS

By pressing 04 in the service mode, the processor checks the found addresses on the screen. The set must be confic

	Reg 04	Configu 22	ration
н ,	SW B 10 4	us Addro E 22 84	esses 42 CO

The old configuration value is shown on the screen until ne button. The set takes the new configuration in use only after serves also as a fault diagnosis system.

Address	Circuit
10	μP software version, ICc4 (830
22	IVT Teletext, ICt2 (SAA5246A)
4E	Nicam Decoder / Micronas, IC
B4	Nicam Decoder / Toshiba, (TB
84	Sound Processor, ICp1 (TDA6
42	D/A Converter, ICb3 (TDA844-
CO	Hyperband Tuner PLL (TSA55
C6	UHF Tuner PLL (TSA5510)

Page 24

SERVICE ADJUSTMENTS VIA IIC DATA BUS

Before making adjustments with RC hand unit, make sure the supply voltage is correctly adjusted. (See Service adjustments/power supply block)

SERVICE MODE SELECTION

TV receiver is set to the service mode by switching the receiver on by pressing the mains switch and within 5 seconds the TV, PRG and EXTRA buttons successively. In the service mode an adjustment bar (register number, adjustment value and min/max values) is shown on the screen.

The version number of the NVM on the screen indicates the selected service mode. The version number of the NVM can also be asked by pressing "05" buttons.


Req	Min	Value	Max
05		10

You can select the normal TV mode by pressing the TV button or the service mode again by pressing the EXTRA button. Return from service mode to normal TV mode by reseting the set with the mains switch.

REMOTE CONTROL COMMANDS IN SERVICE MODE

Number buttons and cursor buttons (left and right) of the hand unit are used for service adjustments. Analog controls function normally; teletext controls and other special controls don't function.

Making the service adjustments

1. Give a two numbered code which determines the adjust

Page 25

Page 26

AYOUT

Page 27

PCB LAYOUT

Page 28

Page 29

ONFIGURATION AND FAULT DIAGNOSIS FOR CIRCUITS CONNECTED

pressing 04 in the service mode, the processor checks all possible addresses of bus driven circuits and shows e found addresses on the screen. The set must be configurated after adding or removing some options.

e old configuration value is shown on the screen until new configuration is stored into NVM by pressing the blue ton. The set takes the new configuration in use only after reseting the set with the mains switch. The configuration ves also as a fault diagnosis system.

10 μP software version, ICc4 (83C154D)	ddress	Circuit
ZZIVT Teletext, ICt2 (SAA5246A)4ENicam Decoder / Micronas, ICr1 (MAS7D102)B4Nicam Decoder / Toshiba, (TB1204)84Sound Processor, ICp1 (TDA6612)42D/A Converter, ICb3 (TDA8444)C0Hyperband Tuner PLL (TSA5510)C6UHF Tuner PLL (TSA5510)A0NVM Memory Block, ICc3 (X240 AP)A2NVM Memory Block, ICc3 (X240 AP)	0 2 E 4 4 2 0 6 0 2	P software version, ICc4 (83C154D) VT Teletext, ICt2 (SAA5246A) Nicam Decoder / Micronas, ICr1 (MAS7D102) Nicam Decoder / Toshiba, (TB1204) Sound Processor, ICp1 (TDA6612) D/A Converter, ICb3 (TDA8444) Hyperband Tuner PLL (TSA5510) IVF Tuner PLL (TSA5510) IVM Memory Block, ICc3 (X240 AP) IVM Memory Block, ICc3 (X240 AP)

SERVICE ADJUSTMENTS VIA IIC BUS

	ode	Min.	Approx. value	Max.	Adjustment	Note!
	4 5		20		Configuration NVM version
1	o \|	00	0E	3F	Horizontal shift
	1 2 3	00 00 00	1F 28 28	3F 3F 3F	Colour saturation Contrast Brightness
		00 00 00	00 0F 13	3F 3F 3F	R black level G black level B black level	See RGB gain and black level adjustments.
1		00	13	ЗF	Tuner AGC	Apply a 1mV (60 dBµV) test signal. Adjust the picture just without noise.
		00	10	1F	L/R cross talk (Not in mono receivers.)	Apply right channel stereo signal. Connect an oscilloscope to the pin16 of ICp1. Adjust the audio signal for minimum.
		00 00	09 0E	0F 3F	Vertical shift Horizontal shift / RGB

Page 30

VIA IIC DATA BUS

ne supply voltage is correctly adjusted. (See Service

r on by pressing the mains switch and within 5 seconds mode an adjustment bar (register number, adjustment

n or the service mode again by pressing the EXTRA eting the set with the mains switch.

MODE

unit are used for service adjustments. Analog controls don't function.


Reg	Min	Value	Max
1 0	00	1E	3F
Reg	Min	Value	Max
10	OO	O2	3F
Reg	Min	Value	Max
10	OO	02	3F

Reg	Min	Value	Max
10	00	02	3F
Reg	76	5432	1 0

Reg 10	7 0	6 0	5 0	4 0	3 0	2 0	1 1	O O

Reg 10	7 0	6 0	50	4 1	3 0	2 0	1 1	0

CONFIGURATION AND FAULT DIAGNOSIS I TO THE IIC-BUS

By pressing 04 in the service mode, the processor checks all possib the found addresses on the screen. The set must be configurated af

The old configuration value is shown on the screen until new configuration. The set takes the new configuration in use only after reseting the serves also as a fault diagnosis system.

Address	Circuit
10	μP software version, ICc4 (83C154D)
22	IVT Teletext, ICt2 (SAA5246A)
4E	Nicam Decoder / Micronas, ICr1 (MAS7E
84	Nicam Decoder / Toshiba, (TB1204)
84	Sound Processor, ICp1 (TDA6612)
42	D/A Converter, ICb3 (TDA8444)
C0	Hyperband Tuner PLL (TSA5510)
C6	UHF Tuner PLL (TSA5510)
A0	NVM Memory Block, ICc3 (X240 AP)
A2	NVM Memory Block, ICc3 (X240 AP)