akai_tv-2550_2551_2850_2851_2852_2881_3451 Chassis Stereo Plus 2

8/12/2019 akai_tv-2550_2551_2850_2851_2852_2881_3451 Chassis Stereo Plus 2

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VI_, -1.

V. .I\__._

50 Hz, 4:3 / 16:9)

3 / I 999

GB Service manual

@I Manuel de service

@ Service-Manual

a Manuale di servizio

@ Serviceanvisning

.

TV 2851-T Multi White

TV 2852-T

TV 2852-T Multi

TV 2852-TN UK

TV 2881-T Multi

TV 2881-T Multi UK

TV 3451-T Multi

K I

TV 2550-TN

TV 2550-T Multi

TV 2551 -TN

TV 2551-TN UK

TV 255%TN Multi

TV 2850-TN

TV 2850-T Multi

TV 2851-T Multi


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the menu language

Press the yellow button to select the Vision menu.

the red button to select the Display set-up menu.

Change the menu language with cursor buttons.

button to store the changes.

Select the programme number you want to tune.

the MENU button.

with the cursor buttons and press the

OK button.

Select Manual tuning and press the OK button.

Select Channel-line with the cursor buttons and

select the channel you want to watch with 3 digits.

button to store.

Press the MENU button.

Select Tuning with the cursor buttons and press the

OK button.

Select Automatic retuning and press the OK button.

retune the channels, press the red button.

be enabled whenever the receiver is

ON or is in stand-by mode.

is switched ON, press the A- (volume

minus) button on local control unit and at the same

time start entering password: MENU and TV. Release

the A- button after the MENU button has been

pressed.

the receiver is in stand-by mode, press the A-

button on local control unit and at the same time start

entering password: MENU and TV. Release the A-

button after the MENU button has been pressed.

Switch ON the receiver by pressing the TV button.

Activate the service mode by pressing the i button and

exit the service mode by pressing the TV button.

service mode by switching off the receiver

with the mains switch.

Service mod e activation stays enabled unti l the

ver is switched off wi th the mains b utton.

service mode an adjustment menu is shown on the

adjustment number and name, initializing

and adjustment (top) values are shown in the

lnitialFmtion of NVRAM

lnitialization of NVRAM

If the NVRAM is replaced, it must be initialized and

configured.

7

Note The receiver doesn t start with uninit ial ized

NVRAM, but stays in stand-by mod e.

1. Activate the service mode as described in Service

mode activation.

2. lnitialize the NVRAM by entering the key code: BLUE,

2,5,4 and OK. Wait approx. 15 seconds and then

press the OK button again.

3. Exit the service mode by pressing the TV-button.

4. Start the receiver and tune in one or more TV

channels with the manual tuning method.

Note The channel s earch doesn t work before the

reference adjustm ents (code 12 and 73) have been made,

see page 10.

5.

Enter the service mode again and configure the TV set

as described in Configuration and fault diagnosis.

(Check that the automatic configuration results in IIC

DEV l&2, AUTO OPT and IF OPT bytes are

corresponding to the actual configuration of the

TV set.)

6. Set the manual option bytes (TEXT OPT, HW OPT and

SW OPT) to correspond the actual configuration of the

TV set.

7. Make all necessary service adjustments (see section-

SERVICE ADJUSTMENTS VIA IIC BUS, page 9)

Note Ul VALU adjustm ent mus t be don e first.

8.

Disable the service mode by switching off the receiver


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Configuration and fault diagnosis

The set must be configured after adding or removing any

option. By pressing the RED button in service mode, the

processor checks the configuration of the TV set and

shows the settings on the screen. The configuration can

be stored by pressing the OK button.

This feature can also be used in fault diagnosis. If an

option bit is not 1 when it should be, the IC (or feature)

is either not present or faulty.

Note IIC DEV 1, IC DEV 2, AUTO OPT and IF OPT byt es

are con figured automatically every time the RED-button

is pressed.

TEXT OPT, HW OPT and SW OPT bytes mus t be set

manually.

Changing the option bytes

1. Select the configuration mode by pressing the RED

button in the service mode.

Auto

Manual

SW VER = pP softw are version .

NVM VER = NVRAM softw are version .

Select IIC Device byte 1 - 2 or Option byte 1 - 5 with

cursor buttons (up/down). The selected byte is shown

highlighted.

The name of a responding bit can be seen by using

cursor buttons (left/right).

Set/clear the bits with number buttons (0 . 7).

Store the settings by pressing the OK button.

Return to the normal service mode by pressing the

RED button.

Option byte description

Bit

Description

Setting

76543210

0

TV tuner 5002PH5

1 Decoder/sync processor TDA8854

2 Teletext processor TPU3050

3 Sound processor MSP34xO

4 Video matrix switch TEA6415

5 PIP processor

6

PIP tuner

7 3D virtual sound processor

:

7

0

1

3

4

:

7

0

1

$4

5

1

Power controller STV5180 Yes No

Sound processor MSP3410 Yes No

Reserved for production use

Yes No

16:9 picture tube

Text memory 4 Mb DRAM

Text memory 1 Mb SRAM

Text memory 256 kb SRAM

Tilt adjustment

NICAM identification enabled

I system in IF

D/K system in IF

L/L system in IF

HEF4094B in IF

FLOF function enabled

Yes No

7,6,5 Text character set selected

000 = West Europe / Czech

001 = East Europe

010 = West Europe/USA

011 = West Europe /Turkish

100 = East Europe 2

AIV connector installed

SVHS input in AV

3.58 MHz xtal installed

Carrier mute enabled

Stand-by prevent

Autostart enabled (Special use only )

Pal + helper blanking 4:3

El FB enabled (USER)

Hotel TV enabled

SW VER = uP software version

NVM VER = NVRAM software version

1

0

Yes No

es No

Yes No

Yes

No

es

No

es No

es No

Yes

No

Yes

No

Yes No

Yes No

Yes No

Yes No

Yes No

Yes No

Yes

No

Yes No

Yes No

Yes No

Yes

No

Yes No

Yes No

Yes No

Yes No

Yes No

Yes No

Yes No

Yes No

Yes No


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buttons in service mode

the receiver is in the service mode you can select

TV mode by pressing the TV button and return to

mode by pressing the i button.

and cursor buttons are used for service

The OK button stores the settings.

yellow button hides/shows the service menu to

for different picture formats

adjustments with PAL signal unless otherwise

Make 4:3 set adjustments with normal

picture format and 16:9 set adjustments

e picture format. Then make the necessary

s with other picture formats/signals. The

adjustments are shown in the table below.

Check the conf igurat ion of the TVset before

the adjustments and make only the necessary

a service adjustment

Give a two digit code which determines an

adjustment (e.g. 00 = vertical shift, see the following

tables) with the number buttons. You can also select

the adjustment with cursor buttons (up-/down).

Power supply and UG2 adjustments must be done

picture geometry adjustments.

geometry adjustments

off-centre shift

shift deflection

-

:ode

-

00

01

02

03

04

05

06

07

08

09

10

-

OSD name

V-SHIFT

V-AMPL.

V SLOPE

S-cot? ?.

VER ZOOM

v SCROLL

WIDTH

H-SHIFT

PARABOLA

CORNER

TRAPEZ

r

-

5

d

2

9

Ii

K

K


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Frontend module Multinorm)

1


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TA801 Scart 2 module

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CRT module

Picture tilt module

Xpsl- 4

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Xpsl- 2

r ps1

15k

Im =

Xpsl- 1


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akai_tv-2550_2551_2850_2851_2852_2881_3451 Chassis Stereo Plus 2

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