Akai 21CTU93BC Service Manual download pdf (Page 11)

REPLACEMENT OF MEMORY IC

1. MEMORY IC.

This TV uses memory IC. In the memory IC are memorized data for correctly operating the video and

deflection circuits.

When replacing memory IC, be sure to use IC written with the initial value of data.

2. PROCEDURE FOR REPLACING MEMORY IC

(1) Power off

Switch the power off and unplug the power cord from AC outlet.

(2) Replace IC

Be sure to use memory IC written with the initial data values.

(3) Power On

Plug the power cord into the AC outlet and switch the power On.

(4) Check and set SYSTEM default value:

3. Note: enter a factory mode method

1) Factory remote control: Press the factory remote control up [PRESET], press again[TEST]key,

appear on the television screen 'M'.

2) Customer remote control

3) Press [menu] key, appear the picture menu, press few character keys 6483, the screen

appears M.

4) Press [standby] key, withdraw factory mode.

5) The “TEST” will be displayed on the screen.

6) Check the setting value of the SYSTEM default value of Table below. If the value is different,

select items by [CH+]/[CH-] keys and set value by [VOL+]/[VOL-] keys.

7) Press “STANDBY” key again and return to the normal screen.

SERVICE ADJUSTMENT

B1 POWER SUPPLY

1. Receive normal colour bar signal.

2. Connect DC voltmeter to VD541- and isolated ground.

3. Adjust potentiometer in power unit to get the voltage as 110V ±1.0V for 21 inch hereinafter,

130 ±1.0V for 25 inch upwards.

FOCUS ADJUSTMENT

1. Receive a crosshatch signal.

2. While watching the screen, adjust the FOCUS VR to make the vertical and horizontal lines as fine and

sharp as possible.

BUS CONTROL ADJUSTMENT

To enter BUS control mode, Press “TEST” key on the Remote control unit of factory. （Customer remote

control press "MENU" key behind in a row press"6""4""8""3"）

Choose a "SETUP SELECT" options in"M2" menu, one by one in order press the numerical key"6, 4, 8 and 3",

press "MUTE" key again can depend on this get into "M3"~"M9" of design menu, general factory the

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Akai 21CTU93BC Service Manual Page 11