Question about JVC UX-P550 System

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Sound DVD/CD noise

"Hi master, I have UX-P550 problem sound noise,
Could you advise what is causes this problem.
I had check output signal at IC DAC is nothing "

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Is the noice come while playing the cd, the problem can occure power amlifire section.first of all check power supply board.


Posted on Jan 19, 2009


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Playstation2 SCPH 3000 - 5006 General Problems

No Power (Totally Death).
  1. Check the output regulator 12volt DC Power Supply.
  2. Check the Fuse (Voltage Security Fuse).
  3. Check the Flexible cable on switch board (reset & eject button).
  4. Check the Output Diode.
Lens Problems (Optic)
  • Optical Spull not move (up down).
  1. Check the flexible cable.
  2. Check the Optical spull.
  3. If you have SCPH - 3000 series, check the IC Driver (BA 5815).
  4. If you have SCPH - 5000 series, check the IC Driver (LA 6508).
  5. Check the optical flexible cable socket.
  • Optics spool laterally tilted or irregular jump when the engine turn on.
  1. Check the resistor on 102 block (In IC Servo Master Control area = CXD 3098 : 470-8pin,102-8pin).
  2. Check the resistor under IC Servo Master Control.
  3. If you have SCPH - 3000 series, check the IC Driver (BA 5815).
  4. If you have SCPH - 5000 series, check the IC Driver (LA 6508).
  • Optics can only read one CD/DVD format.
  1. Check the Optic Laser Diode.
  2. Check the Optic Laser Diode with Voltmeter : V3 (CD=1080 to 1260, & DVD=800 to 1300), V4 (CD=850 to 900, & DVD=1200 to 1400), V5 (CD=1200, & DVD=1400), V7 (CD=1200, & DVD=1100 to 1400), V9 (CD=1200 to 1400, & DVD=1200 to 1400).
  • Optics Lights not lit (Lens not light).
  1. Check the flexible cable.
  2. Check the optics spull.
  3. Check the SP 3727 IC.
  4. Check the Amp transistor ( in IC SP 3727 socket board), Upper for CD & under for DVD.
  5. Check the IC 7805 (IC Regulator).
  • Excellent optics but won't to read.
  1. Check the mecanic gear.
  2. If you have SCPH - 3000 series, check the IC Driver (BA 5815).
  3. If you have SCPH - 5000 series, check the IC Driver (LA 6508).
  4. Check the ModChip.
  5. Check the IC SP 3727.
  6. Check the resistor (in 220 block), between IC Servo Master Control & IC Interface (CXD 9611 BR).
  7. Check the transistor (in socket optics= pin 6).

on Sep 16, 2010 | Sony PlayStation 2 (PS2) Console

1 Answer

The volume is messed up. I can turn my TV up all the way and put my ear next to the speakers and barely hear a faint voice. The TV itself is fine though and its not the DvD I'm using, I've switched it a...

You will probably need instruments (voltmeter, oscilloscope) to track down this problem.

At first I was going to suggest there is a fault in the audio buffer amplifier, but the only way that would be the case is if it is the bias circuitry inside a chip shared by both the left and right sound signals, or a power supply problem. The other possibility is the voltage reference for the Digital-to-Analog Converter (DAC).

How it works: the DAC gets the digital audio information from the DVD data processor. It generates an output voltage that is a fraction of the voltage reference value. For example, suppose the voltage reference is 2.5 Volts, and the audio data for the right channel is a 1 followed by fifteen 0's (half of full scale, which is sixteen 1's). The audio DAC should produce 1.25 Volts on the right channel. The audio DAC is almost certainly a dual channel device, and uses one voltage reference for both. If the voltage reference is putting out a very low voltage because it is bad or overloaded by another part, you would get the symptom you are having.

What to look for: identify the audio buffer amplifier IC (trace the circuit back from the sound output jacks). While a DVD is playing, use an oscilloscope to compare the input waveform with the output. You will probably have to search for and download the datasheet for the amplifier IC so you can see where the left and right input waveforms go in. If they are the same amplitude, or the output is larger than the input, the amplifier is probably OK. If not, check the voltages on the other pins on the chip to make sure they are correct. In particular, look at the voltage on the pin labeled "Vcc" or "Vdd" on the datasheet. It should be the same as one of the voltages printed by the connectors coming from the power supply board (give or take several tenths of a volt). If it isn't you'll need to check the power supply voltage with an oscilloscope to see if you have a bad capacitor. It is common for the first capacitor in a power supply filter to fail while the second one is good. This can produce a low voltage output that may still look like a clean straight line on the scope. However, for an audio amplifier, the result would be a low-amplitude, distorted sound.

If all is well with the audio amp, you will have to find the audio DAC chip. Start by downloading its datasheet and identifying the voltage reference input. Measure the voltage there. If the DAC has an internal voltage reference, look for a pin that provides this voltage externally.

Cautions: the laser in the DVD player can cause permanent eye damage if it is accidentally viewed directly. If the player mechanism does not have a cover built into it, put a sheet of opaque material (e. g., cardboard) over the DVD drive while you work on it. Keep your fingers away from the power supply, especially the high voltage section where the power cord comes in (often outlined on the power circuit board with white or black dashed lines, bridged only by transformers and several small parts). Get an anti-static wristband, put it on and connect the lead to the metal case of the DVD player. This is so any static electricity you build up in your clothing won't destroy parts in the DVD player. The transistors inside the integrated circuits, especially the data processor and DAC, are very delicate, and can be ruined by a discharge too small for a human to feel as a shock.

This is probably a "hobbyist" repair job. It's my understanding that this model is worth under $35, and most professional technicians want a minimum of $50 just to look at it. If you get lucky, you may find another unit of the same model that is no longer reading discs (try your local electronics recycler). You can swap the mechanism or main board with that unit to get one working (observe anti-static precautions with both parts - the laser circuit is also vulnerable to electrostatic discharge).

Dec 05, 2010 | Philips Magnavox DVD Player MWD200F

1 Answer

I have bought an used Nakamichi AV1 AVR. The unit powers up and the display is fine. The problem is that there is no sound output from any source (Tuner, CD, Phono or tapes) to the speakers. I get speaker...

There is a switching IC inside this unit that may be the problem, but without seeing the actual unit and signal tracing, this will be near impossible to diagnose. If you have an oscilloscope, place an input signal on one of the inputs and trace the signal to the IC. It will be a TA9263 or something similar. You should see the signal on 2,4 or 6 pins. If you see the signal only on 2, then the IC is likely to be defective.

That would be my first attempt. Also check the power supply to that IC.

Keep us posted on progress.


Aug 17, 2010 | Audio Players & Recorders

1 Answer

Marantz pm 15 s1 amplifier and marantz sa15 s1 Cd player

There really is no point in  connecting the two components with an optical (=digital) cable, if you didn't want to use the SA-15s DAC- and analog output section you might aswell have bo bought the chiepest one you could find...

To get better sound than the SA-15s analog outputs can provide, you would have to spend a load of money (not as much as for the SA-15 but quite a bit) on a DAC - and the DAC would only work with CDs, you would still have to use the SA-15s analog outputs to listen to SACDs.

So in conclusion:
-Use the SA-15s analog outputs

-If you have other digital sources that you want to use - if you care about their sound quality - you can sell/return the SA-15s, buy the chiepest CD-Player you find (only look and feel matter) and spend the rest on a good DAC. (note: SACDs won't play on this setup)

I'm using a PM-15S1 with a DAC (Apogee Mini DAC, Studio-Equipment, nominal price ~1000$, got mine 2nd hand for 400€ ) myself. A DAC is usually the better choice over an expensive CD-Player - especially if you've got other digital sources (PC, ...) - but you'll probably lose a lot of money if you sell the SA-15, so think about it (IF you're still thinking about it, I realise that your question is 8 months old...)

anyway... have fun with the PM-15, it sure is beauty

Jan (Hamburg, Federal Republic of Krautistan)

Jul 01, 2009 | Marantz PM-15S1 2-Channel Amplifier

1 Answer

The DVD-player doesn't show a colored screen

playbak system mismached.please select the tv system to auto mode and player the same.use instruction manual for this.

Dec 07, 2008 | JVC UX-P550 System

1 Answer


chnge the colour system of your player to auto mode .read the instruction manual.


Nov 21, 2008 | JVC UX-P550 System

4 Answers

Statics and hissing...

I also have the same fault, The static noise is coming out
of ic720 [ cs4391 or cs4392 ]on digi pcb which is D-A converter
this ic maybe faulty, i have ordered a replacement ic and will
post here if solves problem

Dec 10, 2007 | Marantz SR-5200 Receiver

4 Answers

Intermitent audio

I had that happen before, one problem was my car had bad shocks or i hit a pothole in the road. The second time i had the volume up so loud the bass wass thumping the floor and it skips the CD. My question is, how lowd is the thign turned up? :P Some CD players load the data into a memory and then it plays from the memory till it needs more info. It maybe that the unit is not stable or the CD is not balanced right so it cant read the info at a consistant speed. The music maybe playing faster then it can read because of the vibrations. Is the disk clean? i know this may sound dumb but it is easy to over look. If the surface of the data side is so scratched up it may have problems reading the data quickly enough. Sometimes the coating can fall of the disk if you hold it in the light you can sometimes see spots threw the disk where the foil has been chipped off. The CD player could have a focus problem also, it could be damaged in shipping or have been dropped and it cant focus properly on the data. Do you have any other disks to try? a new one? one you never play?

Apr 04, 2006 | Philips CDR785 3-Disc CD Recorder

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