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Discussion Starter · #1 ·
Thread to post the journey and steps to bring one of the most beautiful DVD players back to life - the Proceed PMDT. Here are the common issues that arise with this 20 year old player. Unfortunately parts are no longer available and the few remaining Proceed authorized repair shops do not support the PMDT.

I will try to help resolve the following:

The No Disc error
The SpinUp error
The issue where the drawer will not open
The display issues with pixels burned-out
Replace the power supply capacitors / Recap
How to get a unit firmware to V3
How to replace a banged up front face and scratched edges
How to replace a defective card
Here is the starting point... bare metal PMDT. Can they be brought back from the dead? Yes - but it is not easy.

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Here is where we want to be...

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Discussion Starter · #2 ·
Normal Behavior

Here are some key stats for the PMDT that I have that is fully operational:
  • CD Loading - The time on average from pressing drawer close to playing the CD averages 14 seconds. The player will:
    • Display: "Tray Closing"
    • Display: "Loading" with a rotating symbol on the far right
    • Display: "CD" momentarily
    • Display Title 1 and Chapter 1 and begin playing the disc
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  • DVD Loading - The time on average from pressing drawer close to playing the CD averages 14 seconds though is highly variable. The player will:
    • Display: "Tray Closing"
    • Display: "Loading" with a rotating symbol on the far right
    • Display: "DVD" momentarily
    • Display: "Intro" and begin playing the disc
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  • The drawer should open and close smoothly upon pressing the button
  • During Loading a disc:
    • The last character will display a line that appears to rotate
    • You will hear the laser reading the disc which will sound like light short and long chirps
    • You should not hear the spindle motor spinup
  • The characters on the dot matrix display should be free from artifacts or missing pixels. The display is supported by 3 chips:
    • The first 8 characters have large 5x7 characters:
      • Chip 1 displays the first four (4) characters
      • Chip 2 displays characters five (5) through eight (8)
    • Chip 3 displays 8 smaller 5x7 characters and due to the density will appear brighter in these photos. In real life they appear to be the same brightness. It is possible that due to age, the chips in my unit have different levels of brightness.
  • All front panel buttons should work
 

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Discussion Starter · #3 ·
Fixing Issues with the Dot Matrix Display

One of the most noticeable issues with the PMDT is when the display is faulty. This is caused by a faulty display chip. The good news is that each of the three chips that make up the front display are replaceable. The challenge is that the chips required are no longer manufactured. For those PMDT units that I have seen with a chip issue, there is also a power supply capacitor issue (e.g., bad caps) occurring. My guess is that a poor power supply is causing power issues to the display -- based on a small sample set of PMDTs.

Example of a chip with bad pixels. Chip #2 which contains characters 5-8 is faulty and missing pixels on characters 6 & 7:

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This is also an example of a chip that is beginning to burn out. The center of Chip #1has begun to warp and melt allowing light to pass through the center between the 2nd and 3rd characters.
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So what to do? You need to get inside the PMDT. Do this only if you are comfortable working with electronics. Do not touch the power supply. Perform at your own risk.
  1. The one thing that can happen when removing the Face is that you could scratch the DVD drawer since the front edge sits flush with the face. I recommend protecting it with blue tape so you don't accidentally scratch it. Just gently wrap the edge so that when you pull the Face, it cannot be scratched.
  2. Place on a soft towel or mat and turn the PMDT over on its top. Remove the front two feet by unscrewing them from the base.
  3. There are two screws on either side of those feet that hold the Face to the Body. Remove those four screws. This will reduce stability of the face, so hold the unit from the sides only at this point. The Face is still connected to the body by 4 other screws + two DVD transport screws, so it won't go anywhere.
  4. Turn back upright, and remove the top cover by unscrewing the two rear mounts on the bottom left and right. Cover will slide backwards.
  5. Now that the body is open, disconnect the gray ribbon cable at top front right from the unit to the back of the display.
  6. There are two screws connecting the DVD transport to the face. Remove those two screws. You will need to remove the aluminum shield if your PMDT has one over the DVD player.
  7. The power button on the face has a cable that goes under the power supply through a small gap back to the IEC power inlet. In connects with a small red clip which easily pulls off the power inlet. When free... push the power cord towards the face to free up the tension.
  8. Now place the PMDT on a table with the face overhanging the edge. There are four screws along the front bottom edge holding the face on. Remove the middle 2, and then carefully remove the final 2 and prevent the face from falling.
  9. Now the face is held in place by the tension of the power cord. Slowly wiggle the face forward while pushing the power cord through the gap behind the power supply. Do not reach under the power supply due to the potential for high voltages.
It will look like this when removed. In this photo you can also see where the dvd transport mounts to the face right above the dvd slot.
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Next place face down on a towel, and remove the 8 screws holding the board to the faceplate. And lift the board up and free. While it is apart, take the opportunity to use canned air and blow the dust out... and gently clean the plastic display.

The board will look like this where you can see the three display chips in the center.
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Here is a close up of the chips:
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None of the chips are soldered to the board. They are held into mounts that allow them to be pulled off and replaced. To remove a chip, ensure that you are grounded, try not to touch any of the pins, and use a plastic spludger to gently lift each corner until the chip comes out.

The first two chips are:
  • Siemens DLY3416 with direct replacement by OSRAM DLY3416 - Four Character 5x7 Dot Matrix Alphanumeric Display. Neither are still manufactured with the last date of manufacture in 2017 by OSRAM. You can see the date on these chips are 1999 (first two digits of the last number).
The third chip is:
  • Siemens PDSP1881 with direct replacement by OSRAM PDSP1881 - Eight Character 5x7 Dot Matrix Alphanumeric Display. This is also no longer manufactured.
There are a couple ways to get replacement chips:
  • Ebay - These chips occasionally show up on eBay.
  • I source them from other dead PMDTs
  • I am trying to find a parts distributor that has these chips. When I locate, I will update the thread.

Replace your chips, and reverse the instructions and you are back in business.
 

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Discussion Starter · #4 ·
Changing the electrical voltage of a Proceed PMDT (120v to/from 240v)

The PMDT comes with the ability to support the following mains voltage:
  • 100v-120v
  • 220v-240v

The rear IEC input is mounted to a single board that controls the voltage. The board is configurable to select the voltage required without any other changes. It is fairly easily to use the PMDT globally (if you ignore the Region Code requirements).

This is what the board looks like setup for 100v-120v.
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  • (2) Fuses must be 250V AC T1.25A slow-blow time-delay fuses. These are Eaton/Bussman GDC series fuses.
  • Jumper1 needs to connect pins 2+3
  • Jumper2 needs to connect pins 5+6
  • The jumpers pull out of the board fairly easily

This is what the board looks like setup for 220v-240v.
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  • (2) Fuses must be 250V AC T630mA - slow-blow time-delay fuses. These are Eaton/Bussman GDC series fuses.
  • Jumper1 needs to connect pins 6+7
  • The challenge is going from 240v to 120v... you need one extra jumper for 120v.

Where to get additional Insulated Shorting Plugs? Well, I believe it is the following, but will confirm.
  • Keystone Shorting Plug
  • P/N 1461B
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Discussion Starter · #5 ·
Keystone Shorting Plug P/N 1461B.

I ordered the Keystone Shorting Plug and can confirm that it works. Here is a side by side compare. It is slightly different from the original in terms of finish and design.

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Discussion Starter · #6 ·
Proceed PMDT Uneven DVD Tray Open / Close Repair

The CD/DVD tray mechanism is one of the coolest parts of the PMDT. One slab of aluminum effortlessly slides open or closed at the press of a button. Elegant, simple, and beautiful. Unfortunately, with age, the belts that control the opening and closing of the drive tray may cause the tray to appear to have variable speed opening or closing. It may appear to open quickly, slow, and then fully open. Or, during closure, it may start slowly, and then quickly close. This variability in speed is typically a drive belt problem and not a motor problem.

As the belts age, they get loose, and the variability in speed is the tension changing on the drive belts.

A tray that will not open/close at all most likely has another more serious issue.

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How to check your drive belts?
  • Remove the cover
  • Remove the CD/DVD Transport aluminum cover with the 4 top screws
  • NOTE: There are four standoffs that hold the cover to the drive... with age, the glue may have cracked and the little white stand offs may fall about. Also, inside the aluminum cover is sound insulating foam... with age it is sticky/tacky and is no longer resilient... avoid touching it.

Now, you have direct visibility to the drive belts which are at the back left of the transport. There are two. The open/close function is not direct drive since the open/close function is managed by an optical sensor which appears to require motion of the large inside gear. The large inside gear is designed to slip. That slippage will stretch the belts over time. You can poke the belts with your finger and see if they have good tension. Also, open / close the drive... if you see the belts flex, then they have been stretched.

Here is a view from the BOTTOM:

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Here is a close up view from the BOTTOM:
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  1. The outer belt, orange in this photo, is the larger belt. From the factory it is a round belt, probably to allow it to slip. This can be replaced with a round 6.1" drive belt.
  2. The inner belt, black in this photo, is the smaller belt. This can be replaced with a square 5.1" belt.

Approach to remove the transport from the case:
  • You have to remove the transport from the case in order to change the belts
  • Open the drive tray first and place masking tape along the edge so you don't scratch it pulling it out. Then close, power off and unplug the player. You can remove the tray with the four hex bolts that connect it to the guides.
  • Once the tray is removed, you can see a bolt at the rear that connects the transport to the bottom of the case. Remove that bolt.
  • Then remove the two screws that connect the front of the transport to the front face. This will free up the drive.
  • You have to disconnect the two (2) ribbon connectors from the MPEG card
  • You have to disconnect the black power cable that connects to the power supply
  • Now you can pull the transport out of the case
Approach to remove the drive belts:
  • Remove the screw that holds the grounding cable and plastic belt retainer
  • Slide the large traction belt off, and you can then pull the outer orange belt off
  • Remove the large gear that the orange belt was on -- this is held in place with one screw
  • This will give you access to two screw holes that hold the motor in place... you want to loosen them so that you can pull the motor down and provide clearance to get the belt out. Note that when you tighten these back up, the the motor sits in a flexible position to allow it to move. The screws do not hold it tightly in place.
  • Remove the inner belt
  • Clean all the belt paths with a bit of alcohol on a Q-tip - you should find that only the large gear for the inner belt has anything to clean... this is the gear that slips the inner belt and allows the sensor to work.... this is where the inner belt stretching happens
  • In my experience, the lubricants on the belt gears has been in very good condition, and do not require lubrication. You may just want to confirm that those gears turn freely and easily with the belts removed.
Now you can put the new belts in:
  • Use some medical gloves to keep those new belts free of oils
  • Install the inner belt first, then tighten the motor back into place with the two screws
  • Put the large gear back on, and install the larger belt
  • Replace the traction belt, guide and grounding cable
Reverse the process to get the transport back in the case. Takes about an hour.
 

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Discussion Starter · #7 ·
Proceed PMDT Card Configurations

The PMDT chassis was constructed using a seven-slot card-cage, allowing for multiple configurations of the rear panel. I have seen two configurations.

Standard - This configuration was the standard configuration before the Progressive Video Processor Option was released. This configuration is as follows:
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  • Slot 1 = MDT MICROCONTROLLER card
  • Slot 2 = <Empty>
  • Slot 3 = MDT AUDIO card with digital audio outputs
  • Slot 4 = <Empty>
  • Slot 5 = MDT-S VIDEO card with S-Video, RCA Composite, and BNC Composite outputs -- 480i format
  • Slot 6 = MDT-C VIDEO card with BNC component video outputs -- 480i format
  • Slot 7 = MDT-MPEG card that connects to the CD/DVD Transport
PVP Option - This configuration supports the Progressive Video Processor (PVP) Option - a two (2) card configuration. It was a dealer installed option for roughly $1500 USD. This option added a progressive card to Slot 4 and replaced the card in Slot 6 with a video input card to take advantage of the progressive processing card. Once installed, the system adds the PVP Menu to the menu list to allow you to select the input from the PMDT disc or one of the inputs on the input card. This configuration is as follows:
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  • Slot 1 = MDT MICROCONTROLLER card
  • Slot 2 = <Empty>
  • Slot 3 = MDT AUDIO card with digital audio outputs
  • Slot 4 = PMDT PROGRESSIVE VIDEO card with BNC component video outputs -- 480p format
  • Slot 5 = MDT-S VIDEO card with S-Video, RCA Composite, and BNC Composite outputs -- 480i format
  • Slot 6 = PMDT VIDEO CAPTURE card with S-Video, RCA Composite, and RCA Component inputs
  • Slot 7 = MDT-MPEG card that connects to the CD/DVD Transport
Below is the PVP option description from the original Proceed website.


Special Design Features

Digital television (DTV) has given us greatly improved pictures and sound with which we may entertain ourselves. However, most of us still have significant legacies of existing videos and programs we like to watch that have not yet benefited from the performance advantages DTV offers. The PVP fills that gap by converting normal, "interlaced" video to 480p "progressive" video, a DTV standard. But with new technology inevitably comes new terminology. A brief introduction to the new jargon is probably in order.

Deinterlacing ("Line Doubling")

Many people mistakenly assume that a line doubler "doubles " the number of lines in the video signal, perhaps through some sort of interpolation. Given the name, this is a reasonable assumption. Unfortunately, it happens to be wrong.

A better name for a line doubler would be a "deinterlacer " or perhaps a "line accumulator." The main task of a line doubler is to buffer up the odd and even lines, reassembling them in the correct order.

Simple (read "cheap") line doublers do just that. They put the first field (the odd numbered lines of information) into memory, then the second field (all the even numbered lines), and then "reshuffle the deck" to put them back into sequential, progressive order. Having done so, they pass along the entire frame to the video display. In fact, they do so twice: once for the time that each field would otherwise have been displayed, so as to avoid flicker. This is precisely what the unsophisticated progressive outputs built into MPEG decoder chips do.

Thus a line doubler reads out entire frames of information as often as individual fields are normally displayed. (This is where the misleading name comes from.)

Since you are now displaying twice as much information in each unit of time, the TV has to work faster to keep up. Specifically, normal NTSC uses a "horizontal rate" of about 15.75 kHz. This means that the electron beam in a CRT is turning on and off 15,750 times per second (roughly).

To display a line-doubled signal, it must turn on and off twice as fast to display all those extra pixels: about 31.5 kHz. "Regular " televisions cannot do this –this is one of the things you pay extra for with DTV designs.

Problem: what if the interlaced camera used to shoot the video in the first place was pointed at something that was moving? During fast action, the subject would have moved between one field and the next. If you simply reassemble field into frame in a simplistic way, you get jagged edges of moving objects because the fields don ’t line up. This is where motion compensation comes in. It uses sophisticated analysis to compensate for such problems, ensuring that objects stay together, despite the motion between one field and the next. Good line doublers handle this sort of thing much better than simple ones do.

Another problem: video today comes from a variety of sources, including:

• film at 24 frames per second, progressively scanned during conversion to video;

• video cameras, running at an interlaced 30 frames per second;

• computer-generated effects and such, running at a progressive 60 frames per second

Despite their origins, what you have coming in from your cable company or on that rental tape is plain, interlaced NTSC video. The conversions from computer-and film-originated material to "make it fit" normal video are quite different.

One of the hallmarks of a great line doubler is its ability to quickly detect patterns in the incoming video that indicate where the signal originally came from, and to switch to the most appropriate method for reconstructing the progressive signal for each source. There are big differences between deinterlacers (line doublers) in this area.

The PVP 480p output

The PVP Progressive Video Processor option for your PMDT provides a progressive component "480p" video signal to your display device. Rather than relying on the unsophisticated progressive output modes of many MPEG decoders used in modern DVD players, the PVP uses high-performance, purpose-designed circuitry to realize truly outstanding progressive video performance.

Specifically, the PVP is based on a third-generation deinterlacing device that accepts the digital video signal directly from the output of the PMDT’s MPEG decoder.

Because this signal has never been converted to analog prior to being deinterlaced, the deinterlacing circuitry can work with the "original bits" and do a superlative job of rendering the most accurate picture possible from the information stored on your DVD.

As described above, the PVP has three different modes, depending on the source of the video footage being reproduced. It also includes advanced adaptive motion compensation to minimize interlace artifacts. Its sophistication goes far beyond the progressive outputs found on most DVD players. In short, it does everything you would expect of a state-of-the-art deinterlacer, with even greater precision, due to the direct digital video connection used within the PMDT, between the MPEG decoder and the deinterlacer.

Video inputs

Having gone to the trouble of "doing it right" with the deinterlacing in the PVP, it seemed wrong to then send you back to the world of poorly-implemented deinterlacing for the rest of the "legacy" components in your system.

Instead, the PVP includes a high quality video inputs board that receives interlaced video (either NTSC or PAL),decodes it, and forwards a digital component video version of the signal to the deinterlacer and video output board. Using the "PVP menu" in the PMDT, you can easily select from the component, S-video, and composite inputs on the video inputs card, or select the PMDT itself for watching a DVD.

In this way, several outboard components can benefit from the exacting implementation of the deinterlacer used in the PVP, rather than limiting those benefits to the playing of DVDs only.

A system solution

If you also own a Proceed audio video preamplifier (AVP or PV/PDSD combination), the system becomes significantly more powerful and flexible, while at the same time being even easier to use.

By connecting a communications cable between the PVP-equipped PMDT and the Proceed processor (and making sure that each is running its latest system software) and making a few other connections, you can route all of the composite and S-video signals coming into the processor to the appropriate inputs of the PVP video inputs board for deinterlacing and high quality output.

In addition, the component input on the PVP now becomes available for any other normal, interlaced signal in your system –perhaps a satellite dish. This effectively adds component video switching to our Proceed processors, since there are now two component video sources available to the system: the internal, digital component connection between the PMDT and the PVP; and the external, analog component connection on the video inputs board.

Thus, for example, the PMDT/PVP/AVP system has the following input complement:

• four composite inputs

• four S-video inputs

• one digital component input (direct, within the PMDT itself)

• one analog component input (on the video input board of the PVP)

The addition of the PVP to a PMDT/Proceed surround processor system effectively allows the PMDT to be your DVD player, and the system’s video processor, and an expansion video switcher. Better still, because the products can "talk " to each other, everything happens transparently to the user. Simply select the input you want as you always have on the Proceed surround processor, adjust the volume, and relax to enjoy outstanding audio and video performance.
 

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Discussion Starter · #8 ·
The Proceed PMDT JVB Digital SDI Card Option

There was one other third party card option sold by JVB Digital for roughly 1750 Euro. This option is rare, and I have never seen it. This upgrade added a SMPTE259M serial digital interface (SDI) as a card for Slot 4 that provided two (2) SDI outputs. The card bypasses the D/A and A/D stages and sends a digital 480i & 576i signal as an output. The card promised a much more detailed picture with richer colors and NO video noise associated with the use of analog cables. The SDI-Digital-Video Output was for connection to a Dscale or VIGATEC processor or displays / devices with SDI inputs.
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