Akai CT-1419A, CT-2159U Schematic

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Solid State 21” Colour Television Receiver

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EARPHONE

AUTO VOLTAGE

ALIGNMENT INSTRUCTION

Before Adjustment and Maintenance

I .

Don’t short any two soldering points or connect any component while TV set is power on.

A.

Pull out power plug before maintenance.

B.

In order to ensure safety all components replaced should be identical with originals. (For

C.

further details, refer to the component name and component No. in PARTS LIST.)
Must warm up for 30 minutes or more and degauss CRT thoroughly with demagnetiser

D.

before alignment.

Equipments for Adjustment

II.

a. Pattern Generator (PHILIPS PM 5518)

c. High Voltage Meter

e. DC Regulated Power Supply

ADJUSTMENT LOCATION

Ill.

b. Digital Voltmeter (Inner Resistance t 10MhZ )
d. Demagnetiser
f. Oscilloscope

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CN902

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POWER SWITC H

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(SECAM COLOUR DEMO A LIGN)

C604

BR901

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AC INPUT

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ALIGNMENT INSTR U CTION

IV. SETUP EEPROM (IC602)

A. OPTION (W/INITIATE CHANNEL) LIST FOR AKAI l-CHIP MODEL

In order to maintain the option code.

The IC602 EEPROM is absoletely necessary to replace with the following item according

to the destination, when the IC602 EEPROM in the Main PCB is replace for any reason.

When placing an order tor EEPROM be sure to list the option code and Ref No. of EEPROM

which is required for ordering instead of part number.

B. Check each pairs of power supply and if normal then go on to do following alignment

Check Point c403+ c405+ C108+

Voltage Value +B +16V(14”)

+18\/(20”/21”)

C. Press key “NORMAL” on REMOTE HANDSET to set each analogue (Brightness, Contrast

Colour and Tint) value at normal position.

+31.7v

c429+ C428+ c435+ ZD405- C604+

+24V +14v

+9v +5\IM +5v

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ALIGNMENT INSTRUCTION

D DATA SETTING

* : There setting are able to set by “normal” adjustment (Colour, Brightness and Contrast)

Engaging the “TEST MODE” or “ADJUST MENU”.

To set the CTV to test mode (adjust menu), turn on the power switch while press and

holding volume “+” and

The “ADJUST MENU” is indicated with each parameter on the screen.

To disengage the “TEST MODE” (ADJUST MENU), turn off the power switch or press

the power key on the hand set.

Pressing the above address key can select the corresponding parameter. The parameter

value can be changed by pressing volume “+” and “-” keys.

Method to enter into ADJUST MENU

v.

A. Turn off the Main Power Switch, then keep down Volume Buttons “UP” and “DOWN” on

the Marn PCB Simultaneously and turn on the Main Power Switch again “ADJUST MENU”

will be displayed on the screen.

B. Corresponding Functions of keys on REMOTE HANDSET

Keys

Functions AFT RF VC0 C-R C-G C-B DR D-R S-B VAD H-C

Adjustment of AFC

VI.

A. Preparation Procedure

1. Set digital voltmeter at DC, then connect its probes to terminal of R643 and GND.

2. Enter into ADJUST MENU.

1 234567890

“-‘I buttons on the front cabinet.

MUTE

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