JBL DVD600 Service Manual

Also see for DVD600: Owner's manual

Contents

Troubleshooting Model : DVD6001) Power. : When the ST/BY +5V of Front is transmitted to Power control port, the power of SMPS will be switched. Andunit turns on. Check point : Power control port : CP214, 1pin Actually the input power is +3.5V, and if the unit does not turn on, all the power which supplies for Main is OFF.2) Communication between Front CPU and STI5505 Check point : CN208 & RXD/TXD port. When the Main Board system is initializing, Sti5505 dispatches data to Front CPU in order to wake it up. If the 1)power and 2)communication between Front CPU and Sti5505 are normal, but still there are Open/shorterrors, so we call “ Power on” error, it because can not wake up Front CPU.! RXD/TXD : Receiving / Transfer data port (Main = RXD, Front TXD at PCB)3) Operation of STI5505 Checking of each RAMs (Flash/DRAM SDRAM) / EEPROM. => At this time, SCL/SDA should be High. If theyare low, the Sti5505 is not waken up. In case of Sti5505 does not wake up properly, Main clk (27.0MHz) is normal, but SDRAM clk is not normal. Check point : R350 When initialize MECHA by reset, the CPU of Front-end is in initial operation.(Pick up down rotating Roulette/ sensing Disc sensing Roulette fixed Pick up ST/BY mode )4) Main and Flash reset Check point : C3125) If you find any problems for operation initializing , after being satisfied above condition,need to check Mecha control line Check point : CP206, power and connection including soldering.6) Test screen (color bar) / initial screen (stop screen : Vendor Logo screen) Test screen : All data but Logo screen is taken care by SDRAM. Also you can easily check with using 2keys on Front Panel. (! Already issue data regarding these two keys) Also, this mode is used for RESET as initial default value regarding Set up menu which is in EEPROM(M24C02) Set up menu Reset : OSD user Menu user setting restoration default value.Ex.) Password… Vendor Logo screen : When Power on, the Logo screen which is in Flash-RAM goes to DRAM. Thus, if the initial logo screen is not been displayed, it because of DRAM line.Regarding MP set it may be caused from poor soldering.7) Audio. Serial data(24bit/fs =48KHz) is transmitted to AK4393(DAC) at Sti5505. If set does not make any image on screen also audio data does not come out.DATA Process:Serial data +/-L/ R L / R double-muteSti5505 AK4393 CH mixing AMP Gain AMP Audio Out Mute : Double-mute at Out board. (Mute power <– ST/BY +5V).8) Video. The data is taken care by SDRAM. Need 8M for NTSC & need 16M for PAL. Sti5505(Decoder – video signal:C-V, COMPOSITE, COMPONENT) TSH95(Video 6dB gain AMP) Output. TSH95 : handling ST/BY mute by switching bias at internal AMP. check point : #8 and #9 Pin. If ST/By +5V,Mute power, is dropped , Mute will be on and it causes no signal on screen or only see black andwhite screen intermittently. Mute on : 8(H) / 9(L). Mute off : 8(L) / 9(H) High power should be over than 2.5V ST/BY +5V power is dead if Diode (1N4004) on Front board burn.9) Digital output (Coaxial)* High speed inventor Pulse Trans(TS801: purpose impedance matching).17DVD600