Toshiba TW40F80 manual Feature, OUTLINE 2. MERITS OF BUS SYSTEM, Improved Serviceability

SECTION I:

1. FEATURE

The TW40F80 is a first PJ-TV with a wide screen aspect ratio of 16:9 we introduce to North U.S.A. markets.

As the basic chassis N5SS chassis is used.

The future of the model TW40F80 is the use of the N5SS chassis. This chassis introduces a new bus system, devel- oped by the PHILIPS company, called the I2C (or IIC) bus. IIC stands for Inter-Integrated Circuit control. This bus co- ordinates the transfer of data and control between ICs inside the TV. It is a bi-directional serial bus consisting of two lines, named SDA (Serial DATA), and SCL (Serial CLOCK). This bus control system is made possible through the use of digi- tal-to analog converters built into the ICs, allowing them to be addressed and controlled by strings of digital instructions.

The TW40F80 is a first wide TV with a double window sys- tem we introduce to North U.S.A. markets.

The size of the main and sub screens separated in left and right on the screen is the same as each other. So it is possible to enjoy two programs or video and TV program at the same time.

The sub screen is equipped wit 9 screen search function and this is very convenient convenient to search a program you desire.

Note:

Only the different points from the manual “N5SS Chassis” with its file No. 026-9506 are described on this manual. For other parts common with “N5SS Chassis”, please refer to the original manual with its File No. 026- 9506.

OUTLINE

2. MERITS OF BUS SYSTEM

2-1. Improved Serviceability

Most of the adjustments previously made by resetting vari- able resistors and/or capacitors can be made on the new chas- sis by operating the remote control and seeing the results on the TV screen. This allows seeing adjustments to be made without removing servicing speed and efficiency.

2-2. Reduction of Parts Count

The use of digital-to-analog converters built into the ICs, allowing them to be controlled by software, has eliminated or reduced the requirement for many discrete parts such as potentiometers and trimmers, etc.

2-3. Quality Control

This central control of the adjustment data makes it easier to understand, analyze, and review the data, thus improving quality of the product.

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