TU-DTV1000/A SERVICE MANUAL S08Y6TU-DTV10 ATSC DIGITAL TELEVISION SYSTEM DTV DECODER TU-DTV1000/A MODEL In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used.
TU-DTV1000/A Specifications Product Type DTV Decoder Model TU-DTV1000 Video System ATSC Digital television system Receiving Frequency VHF : Low 54~88MHz, High 174~216MHz UHF : 470~806MHz Antenna Input 75Ω unbalanced Video Output Signal 1080i(HDTV) » 5BNC Output R.G.B : 1.0Vp-p (Trilevel Sync On), 75Ω...
TU-DTV1000/A IMPORTANT SERVICE SAFETY NOTES Ë Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and servicing guidelines as follows: » Use an AC voltmeter with sensitivity of 5000 ohm per WARNING volt., or higher, sensitivity to measure the AC voltage...
TU-DTV1000/A WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT TO MOISTURE OR WET LOCATIONS. CAUTION The lighting flash with arrowhead within a triangle is intended to tell the user that RISK OF ELECTRIC SHOCK.
TU-DTV1000/A CONTROL OPERATION QUICK REFERENCE...
TU-DTV1000/A REMOVING OF MAJOR PARTS 1. Removing the top cabinet 1-1. Remove the four lock screws off the right and left sides of the top cabinet. 1-2. Remove the five lock screws off the back of the top cabinet. Slide the top cabinet toward yourself and detach...
TU-DTV1000/A 2. Removing the front cabinet and PWBs 2-1. Remove the three lock screws off the front cabinet. Undo the three hooks at the bottom and detach the front cabinet. 2-2. Remove the three lock screws and take out the Operation unit PWB.
TU-DTV1000/A 3. Removing the ATV-1 and ATV-2 unit PWBs 3-1. Remove the nine lock screws off the terminals on the back. 3-2. Disconnect the connectors of the ATV-1 and ATV-2 unit PWBs. 3-3. Remove the eight lock screws off the ATV-1 unit PWB. Disconnect the terminals from the bottom cabinet. Lift and detach the ATV-1 unit PWB.
TU-DTV1000/A 4. Removing the Main power and Sub-power unit PWBs 4-1. Remove the two lock screws off the Sub-power unit PWB bracket. 4-2. Remove the five lock screws off the Sub-power unit PWB. Detach the sub-power unit PWB from its bracket.
TU-DTV1000/A TROUBLE SHOOTING TABLE No power (Unit’s power LED failure to light up) » Make sure the AC cord is plugged in. Is the unit switched on using the unit’s power switch or the R/C unit? (No power with the...
TU-DTV1000/A TROUBLE SHOOTING TABLE (Continued) No video output, no audio output First make sure of the following points. » The AC power cable is plugged in. » The power is switched on and the unit’s power LED stays on. » The output mode switch is properly set according to a monitor to be connected.
TU-DTV1000/A TROUBLE SHOOTING TABLE (Continued) Check the LEDs (D5023, D5024 and D5025) on the ATV-1 PWB. Does the D5023 light up in green? A DTV signal (available in the selected channel) is There is no DTV signal for the selected channel.
TU-DTV1000/A TROUBLE SHOOTING TABLE (Continued) Images in a certain input format or from a certain output terminal are poor. Errors in main NTSC system output only (no problem with Errors in main HDTV and Errors in NTSC record Errors in 480I format input HDTV system output) 480P system output only.
TU-DTV1000/A SERVICE ADJUSTMENT Precaution: When the set has been disassembled and repaired, be sure to place all the copper tapes and filters back into position to keep against unintended radiation. Ë Serviceman mode This model is equipped with the serviceman mode for a repairman to get the information that is effective in servicing the set in the field.
TU-DTV1000/A Ë Service mode DTV stands for digital television broadcast. In analog broadcast, the worse the reception condition gets, the more noises and ghosts occur on the screen. In digital broadcast, on the other hand, there is no degraded images up to a certain level.
TU-DTV1000/A PACKET ERROR : Indicates the current reception condition by displaying, in bars and figures, the number of errors of the data received for a certain period of time. This helps estimate the antenna condition, signal level and other data.
TU-DTV1000/A Ë Check mode In this mode, the basic performance of the hardware that is connected with the main microprocessor (SH3) is checked up. The check results are displayed on the screen. 1) Check mode screen and switching There are three screens for the check mode. Press the SELECT key on the set or the R/C unit, and at each push the three screens get switched one after the other.
TU-DTV1000/A CHECK MODE 2 screen CHECK MODE 2 (ST20) DPRAM: OK (or NG) Tuner : OK (or NG) : OK (or NG) Video : OK (or NG) Audio : OK (or NG) : OK (or NG) CHECK MODE 2 (ST20): Tells that the set is in the check mode 2.
TU-DTV1000/A CHECK MODE 3 screen CHECK MODE 3 (push key) CLEAR MENU BLUE GREEN LEFT RIGHT BLACK DOWN SELECT CHECK MODE 3 (push key): Tells that the set is in the check mode 3. Press the keys on the front of the set to check the functions of the switches.
TU-DTV1000/A TU-DTV1000/A DESCRIPTION OF SCHEMATIC DIAGRAM SCHEMATIC DIAGRAM Ë OPERATION and R/C·LED UNITS VOLTAGE MEASUREMENT CONDITION: 1. Voltages at test points are measured at the supply voltage of AC 120V. Signals are fed by a OPERATION color bar signal generator for servicing purpose and the above voltages are measured with a 20k ohm/V tester.