Television receiver

Abstract: A television receiver is disclosed comprising a nonvolatile memory; means for reading out data from the nonvolatile memory; adjustment sections for adjusting variable parameters of said receiving circuit such as sound volume or brightness of the television receiver operating in at least two different adjustment conditions; controlled changing means for changing said adjustment conditions of said adjustment sections of the television receiver between first and second adjustment conditions; a power supply. The television receiver also comprises means for turning on the power supply in response to the data of the nonvolatile memory representing one of said first and second adjustment conditions.

Description: This invention relates to a television receiver, comprising the features of the preamble of claim 1. Recently, television receivers with various additional functions have been developed. A final stage of the production of such multi-function television receivers requires many steps for adjustment and check. US Patent Application US-A-4858006 discloses such a television receiver in a servicing mode. It is good to reduce the number of these steps for an efficient production of multi-function television receivers. SUMMARY OF THE INVENTION It is an object of the present invention to provide a television receiver which can be produced efficiently. This object is achieved with a television receiver comprising the features of independent claim 1. Preferred embodiments are described in the dependent claims. The present invention will now be described by way of example only and with respect to the accompanying drawings. In the drawings: BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a television receiver according to a first embodiment of this invention. Fig. 2 is a block diagram of a television receiver according to a second embodiment of this invention. Fig. 3 is a flowchart of a program operating the microcomputer of Fig. 2. Fig. 4 is a time-domain diagram showing a sequence of steps in the production of a television receiver. Fig. 5 is a time-domain diagram showing a sequence of steps in the production of a television receiver and modes of operation of the television receiver. Fig. 6 is a diagram showing a television receiver and steps in the production of the television receiver. DESCRIPTION OF THE FIRST PREFERRED EMBODIMENT With reference to Fig. 1, a television receiver includes a microcomputer 1, a factory check mode switch 2, an input device 3, an on-screen device 4, a usual television receiving circuit 5, and a cathode-ray tube (CRT) 6. The microcomputer 1 is connected to the factory check mode switch 2, the input device 3, the on-screen device 4, and the television receiving circuit 5. The on-screen device 4 is connected to the CRT 6. Also, the television receiving circuit 5 is connected to the CRT 6. The input device 3 includes a remote-control input device and an input keyboard. Various instruction signals can be inputted into the microcomputer 1 by operating the input device 3. The microcomputer 1 can output image information to the on-screen device 4. The on-screen device 4 generates an RGB video signal in response to the received image information and feeds the RGB video signal to the CRT 6 so that the image information can be visualized on the CRT 6. The microcomputer 1 includes a combination of a CPU, a RAM, a ROM, and an I/O port. The microcomputer 1 operates in accordance with a program stored in the ROM. The program is designed so that the microcomputer 1 can execute processes indicated later. The factory check mode switch 2 is of the manually-operated type, being changeable between an on position and an off position. The microcomputer 1 always monitors the position of the factory check mode switch 2. When the microcomputer 1 detects that the factory check mode switch 2 assumes the on position, the microcomputer 1 sets a quick mode of operation of the television receiver in which electronic control volumes such as a sound control volume and a brightness control volume can be vaned at higher speeds than normal. The higher variation speeds enable faster check and adjustment of the television receiver. During check and adjustment stages of the production of the television receiver in a factory, the factory check mode switch 2 is changed to the on state so that the microcomputer 1 sets the television receiver into the quick mode of operation. During the quick mode of operation, when an instruction signal for brightness adjustment is inputted into the microcomputer 1 via the input device 3, the microcomputer 1 generates brightness control signals and brightness test signals and feeds the brightness control signals and the brightness test signals to the television receiving circuit 5. As a result, brightness check and brightness adjustment of the television receiving circuit 5 are enabled. When an instruction signal for self-diagnosis is inputted into the microcomputer 1 via the input device 3, the microcomputer 1 checks vanous adjustment sections of the television receiving circuit 5 and generates image information representative of the results of the check. The microcomputer 1 outputs the image information to the on-screen device 4. The on-screen device 4 generates an RGB video signal in response to the received image information and feeds the RGB video signal to the CRT 6, so that the results of the check are visualized on the CRT 6. When the check and adjustment stages of the production of the television receiver are completed, the factory check mode switch 2 is changed to the off state. Then, the factory check mode switch 2 may be removed from the television receiver. DESCRIPTION OF THE SECOND PREFERRED EMBODIMENT With reference to Fig. 2, a television receiver includes a usual television receiving circuit 11, an input device 12, a microcomputer main section 13, a RAM 14, a nonvolatile memory 15, an on-screen device 16, and a cathode-ray tube (CRT) 17. The microcomputer main section 13 includes a CPU, a ROM, and an I/O port. The microcomputer main section 13, the RAM 14, and a nonvolatile memory 15 are connected to compose a microcomputer. The microcomputer main section 13 is also connected to the television receiving circuit 11, the input device 12, and the on-screen device 16. The on-screen device 16 is connected to the CRT 17. Also, the television receiving circuit 11 is connected to the CRT 17. The input device 12 includes a keyboard 121 and a pair of a remote-control transmitter 122 and a remote-control receiver 123. Various instruction signals can be inputted into the microcomputer main section 13 by operating the input device 12. The nonvolatile memory 15 stores 1-bit data for representing either a factory mode or a normal mode. The 1-bit mode data is initially set so as to represent the factory mode. In addition, the nonvolatile memory 15 stores various information data and reference data which are changed in response to a change between the factory mode and the normal mode. The various information data and the reference data are initially set so as to correspond to the factory mode. The microcomputer main section 13 can output image information to the on-screen device 16. The on-screen device 16 generates an RGB video signal in response to the received image information and feeds the RGB video signal to the CRT 17 so that the image information can be visualized on the CRT 17. The microcomputer main section 13 operates in accordance with a program stored in the internal ROM. When a power supply switch (not shown) leading to the microcomputer is changed to an on position, the microcomputer is reset and then the microcomputer starts to execute the program. Fig. 3 is a flowchart of the program. As shown in Fig. 3, a first step 31 of the program reads out the 1-bit mode data, the vanous information data, and the reference data from the nonvolatile memory 15, and stores all the readout data into the RAM 14. A step 32 following the step 31 decides whether or not the 1-bit mode data represents a factory mode. When the 1-bit mode data represents a factory mode, the program advances to a step 33. Otherwise, the program jumps to a step 34. The step 33 changes a main power supply relay switch (not shown) of the television receiver to an on position, so that all the sections of the television receiver are activated. In addition, the step 33 controls the on-screen device 16 so that a reference image will be indicated on the CRT 17 and that the CRT 17 and other sections of the television receiver will be set into an ageing state (an ageing mode of operation). After the step 33, the program advances to the step 34. The step 34 decides whether or not an instruction signal for adjustment and check is inputted from the input device 12. When an instruction signal for adjustment and check is inputted from the input device 12, the program advances to a step 35. Otherwise, the program advances to a step 36 which continues the current mode of operation. After the step 36, the program returns to the step 34. Thus, the steps 34 and 36 are reiterated until an instruction signal for adjustment and check is inputted. The step 35 decides whether or not the CRT 17 and other sections of the television receiver are in the ageing mode of operation. When the CRT 17 and other sections of the television receiver are in the ageing mode of operation, the program advances to a step 37. Otherwise, the program jumps to a step 38. The step 37 controls the on-screen device 16 so that the operation of the CRT 17 will be changed from the ageing mode to a factory mode. In addition, the step 37 changes the operation of the television receiving circuit 11 into a factory mode. While the CRT 17 and other sections of the television receiver are in the factory mode, higher control speeds can be attained and special processes of checking and adjusting the television receiver can be executed. After the step 37, the program advances to the step 38. The step 38 decides whether or not the 1-bit mode data represents the factory mode. When the 1-bit mode data represents the factory mode, the program advances to a step 39. Otherwise, the program advances to a step 40, which controls the on-screen device 16 and the television receiving circuit 11 so that the CRT 17 and other sections of the television receiver will be set into a normal mode of operation. After the step 40, the program returns to the step 34. The step 39 decides whether or not an instruction signal for shipment setting is inputted from the input device 12. When an instruction signal for shipment setting is inputted from the input device 12, the program advances to a step 41. Otherwise, the program advances to a step 42. The step 41 changes the 1-bit mode data in the nonvolatile memory 15 so that the 1-bit mode data will represent the normal mode. A step 43 following the step 41 changes the various information data and the reference data in the nonvolatile memory 15 so as to correspond to the normal mode. After the step 43, the program returns to the step 34. The step 42 executes special factory-mode processes of checking and adjusting the television receiver. During the execution of the special factory-mode processes, electronic control volumes such a sound control volume and a brightness control volume in the television receiver can be varied at higher speeds than normal. A step 44 following the step 42 controls the on-screen device 16 so that a predetermined message or pattern representing the factory mode will be indicated on the CRT 17. After the step 44, the program returns to the step 34. As shown in Fig. 4, a final stage of the production of the television receiver includes various steps such as adjustment steps 61 and 62, check steps 63 and 64, an ageing step 65, and a shipment setting step 66. These steps 61-66 are sequentially executed. In the case where the production facilities of the factory are designed so as to reset the microcomputer when each of the steps 61-66 ends, the CRT 17 and other sections of the television receiver are automatically held in the ageing mode of operation by the step 33 of Fig. 3 during loss times between the steps 61-66. Furthermore, in the case where a desired ageing process is completed by the ageing operation in the loss times, the positive ageing step 65 can be removed as shown in Fig. 5. As shown in Fig. 6, the steps 61, 62, 63, 64, and 66 use respective remote-control transmitters 131, 132, 133, 134, and 135 in place of the remote-control transmitter 122.

Claims: A television receiver comprising: a receiving circuit (5, 11); a nonvolatile memory (15); means (13) for reading out data from the nonvolatile memory; adjustment sections for adjusting variable parameters of said receiving circuit such as sound volume or brightness of the television receiver operating in at least two different adjustment conditions; controlled changing means (13) for changing said adjustment conditions of said adjustment sections of the television receiver between first and second adjustment conditions; a power supply; characterized by means for turning on the power supply in response to the data of the nonvolatile memory (15) representing one of said first and second adjustment conditions. The television receiver of claim 1 wherein speeds of adjustment variation of said adjustment sections of the television receiver in one of said first and second adjustment conditions are higher than corresponding speeds in a normal condition. A television receiver according to claim 2, comprising a manual switch having a changeable state and means for changing the operation of the adjustment section between an adjustment condition with a higher speed of adjustment variation and an other adjustment condition with a lower speed of variation of adjustment in response to the state of said manual switch.

Inventors: AIYAMA KUNIO, SHIMIZU YOSHIKAZU, YOSHIMI OSAMU, AIYAMA, KUNIO, SHIMIZU, YOSHIKAZU, YOSHIMI, OSAMU
Applicants: MATSUSHITA ELECTRIC IND CO LTD, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Application year: 1991
Main classification: H04N17
IPC codes: H04N17, H04N5