SONY KV21 FD TRINITRON – SERVICE MODE - SCHEMATIC

Sony FD Trinitron KV21 – Service Mode - Schematic

KV-21FT1B   -  RM-887 French SCC-Q54A-A

 KV-21FT1K   - RM-887 OIRT SCC-Q51A-A

KV-21FT1U   - RM-887 UK SCC-Q52A-A

KV-21FT1E   - RM-887 Spanish SCC-Q53A-A

Error codes - LED blinking codes
The identification of errors within the FE-2 chassis is triggered in one of two ways:-

1: Busy or 

2: Device failure to respond to IIC. 

In the event of one of these situations arising the software will first try to release the bus if busy (Failure to do so will report with a continuous flashing LED) and then communicate with each device in turn to establish if a device is faulty. If a device is found to be faulty the relevant device number will be displayed through the LED (Series of flashes which must be counted) See table 1., non fatal errors are reported using this method. Each time the software detects an error it is stored within the NVM.

How to enter into Table 2

Turn on the main power switch of the TV set and enter into the ‘Stanby Mode’.

2. Press the following sequence of buttons on the Remote Commander.

[i+] [5] [Vol --] [TV]

The table 2 will be displayed indicating the error count.

 [To clear the error count data press ‘80’ on the Remote commander.]

Removal of the Anode-Cap

Turn up one side of the rubber cap in the direction indicated by the arrow [a]

Using a thumb pull up the rubber cap firmly in the direction indicated by the arrow [b]

When one side of the rubber cap is separated from the anode button, the anode-cap can be removed by turning up the rubber cap and pulling it up in the direction of the arrow [c]

How to handle the Anode-Cap

To prevent damaging the surface of the anode-cap do not use sharp materials.
2. Do not apply too great a pressure on the rubber, as this may cause damage to the anode connector.
3. A metal fitting called a shatter hook terminal is fitted inside the rubber cap.
4. Do not turn the rubber foot over excessively, this may cause damage if the shatter hook sticks out.

White balance adjustment for TV mode and Service Mode Entry

1. Input an all-white signal from the pattern generator.
2. Enter into the ‘Service Mode’ by pressing ‘TEST’, ‘TEST’ and ‘MENU’ on the Service Commander.
3. Select ‘Service’ from the on screen menu display and press the right arrow button on the remote commander.
4. The ‘Service’ menu will appear on the screen.
5. Set the ‘Contrast’ to MAX.
6. Set the ‘R-Drive’ to 25.
7. Adjust the ‘G-Drive’ and the ‘B-Drive’ so that the white balance becomes optimum.
8. Press the ‘OK’ button to write the data for each item.
9. Set the ‘Contrast’ to MIN.
10. Adjust the ‘G-Cutoff’, and the ‘R-Cutoff’ with the left and right buttons on the remote commander so that the white balance becomes optimum.
11. Press the ‘OK’ button to write the data for each item.

How to enter into the Service Mode

[Service adjustments to this model can be performed using the supplied Remote Commander RM-887.]

1. Turn on the main power switch and enter into the stand-by mode.
2. Press the following sequence of buttons on the Remote Commander.

[i+],[5],[Vol+],[TV]

‘TT—’ will appear in the upper right corner of the screen. Other status information will also be displayed.

Press ‘MENU’ on the remote commander to obtain the following menu on the screen.

4. Move to the corresponding adjustment item using the up or down arrow buttons on the Remote Commander.
5. Press the right arrow button to enter into the required menu item.
6. Press the ‘Menu’ button on the Remote Commander to quit the Service Mode when all adjustments have been completed.

Sub Brightness Adjustment

1. Input a Monoscope pattern.

2. Press ‘TEST’ ‘TEST’ 13 on the Remote Commander.

3. Adjust the ‘Sub-Brightness’ data so that there is barely a difference between the 0 IRE and 10 IRE signal levels. 

Sub Contrast Adjustment

1. Input a video signal that contains a small 100% white area on a black background.

2. Connect an digital voltmeter to Pin 10 of J701 [C Board].

3. Adjust the Sub-Contrast [‘TT11’] to obtain a voltage of 95 +0,- 5V.

Tuner AGC Adjustment

1.Set the “AGC adjust” register value :

• For destination France set the value to 6.

• All other destinations set the value to 0.

2. Receive a signal of 64dBuV / 75 ohm terminated [62dBuV / 75 ohms for B model] via the tuner antenna socket.

3. Connect a voltmeter to pin1 of TU101 [print side of A Board] or to the AGC pin of CN001 [mount side of A Board].

4. Confirm that the AGC voltage is 3.5volts +/- 0.3volts.

5. If adjustment is required, enter into the ‘Test Menu’.

6. Select the ‘AGC Adjust’ menu item.

7. Adjust the data using the left and right arrow buttons on the Remote Commander to obtain a voltage of 3.5V +/- 0.3V.

Test mode -2

Is available by pressing the ‘TEST’ button twice, OSD ‘TT’ appears.  The functions described below are available by selecting the two numbers. To release the ‘Test mode 2’, press 00, 10, 20 ... twice or switch the TV set into Stand-by mode. In ‘TT Menu’ mode, it is
possible to remove the Menu from the screen by pressing the Speaker Off button once. Pressing the Speaker OFF button a second time will cause the Menu to reappear. The function is kept even when the menu is not displayed on screen.

Schematic (Circuit Diagram)  Click on the pictures to zoom in

PICTURE TUBE (A51LPT6OX)

DEFLECTION YOKE (Y21RSA-S)

TRANSFORMER ASSY, FLYBACK NX-1748//M3A4)

A new TV Repair Assistance Tool that combines ease of use and powerful PC software tools to allow you to save valuable time during many TV repairs.

The TRACE interface connects to the PC's serial port. It provides connection to the TV's I2C bus and can be provided with an Infra-Red transmitter (optional).

The interface is powered by a standard 9 V PP3 battery for portable use, and can also be powered by an external 9V/25mA DC power supply.

The TRACE software that is supplied with the interface allows you to:

* Read, restore and compare NVM contents via the I2C bus

* Acknowledge check of all I2C devices in the TV set

* Read Error Codes (emulation of the Error Reader tool)

With the optional IR Add-on kit, the following features can be added:

Remote Commander emulation

User programmable Functional Check through Infrared

Fast and documented Test Mode setting of all Sony TV chassis.

Additional features such as Adjustments and Troubleshooting are available in chassis-dependent software modules. Please contact your local Sony Service organization for the latest information.

[For workshops already using the existing I2C Link parallel port interface (9-948-320-30), this software can be used as well, replacing the TV Data Handling software (9-948-340-50), but Error Reader and IR functions can only be accessed with the TRACE interface.]