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d770
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Post subject: Re: Yamaha DDP-1 No display need Service manual nyone Posted: 17 Jul 2020, 02:34 |
Serious fan |
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Joined: 19 Aug 2019, 07:23 Posts: 175 Location: Australia Has thanked: 122 times Been thanked: 42 times
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ldfan wrote: Have you tried to see if the processor works at all by setting it up with all the necessary cables? It could be that the only issue is just a messed up display. Im pretty much flying blind on this one...! At the moment I have a Pioneer D770 only (no AC3 mod yet!)...been trying to get to hear AC3 sound for some time. I saw a DDP-1 unit on ebay yesterday that went for $10...I missed the auction ...most sellers that know how rare these things are getting jack the prices up of course.! It could be working ..as it might just be the display...but all chips and components are staying cold even after leaving on for ages...will have another look at components especially power regulators and their diodes and caps...otherwise will hold onto it until hopefully see another reasonably priced unit on fleabay pop up...AC3 units are hard to get these days for sure! Also need to see if I can make an AC3 mod circuit for my D770...but really need something I know that works to try all this out.
_________________ CLD-D770 OK CLD-2850 FLD,R201 CLD-D780 MHolder, PSU C12 CLD-2290 Digital Prob CLD-2590K Lots issues
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ldfan
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Post subject: Re: Yamaha DDP-1 No display need Service manual nyone Posted: 17 Jul 2020, 21:43 |
Hardcore fan |
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Joined: 28 Jun 2014, 05:59 Posts: 1459 Location: San Francisco, CA USA Has thanked: 425 times Been thanked: 533 times
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d770 wrote: It could be working ..as it might just be the display...but all chips and components are staying cold even after leaving on for ages...will have another look at components especially power regulators and their diodes and caps
As odotb3 stated, it could be bad caps in the power supply. If the chips are not even getting warm, I would think it's likely power supply related. A bad control IC could be the issue too but I would think other chips would still be getting warm. d770 wrote: ...otherwise will hold onto it until hopefully see another reasonably priced unit on fleabay pop up...AC3 units are hard to get these days for sure! Agree with that. I always went for processors myself since they are usually cheaper than a standalone RF Demodulator. I might recommend you try and find a unit that has an "optical audio output" if possible since you can use them w/ a modern day AV Receiver and have it do the digital processing. d770 wrote: Also need to see if I can make an AC3 mod circuit for my D770...but really need something I know that works to try all this out. I have a D703 on my bucket list to update to AC-3 as well. Not sure when I'll get around to it but once I do it will be posted on the site. My M90 is next on the list for a very extensive mod with S/PDIF as well as AC-3.
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d770
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Post subject: Re: Yamaha DDP-1 No display need Service manual anyone Posted: 18 Jul 2020, 10:17 |
Serious fan |
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Joined: 19 Aug 2019, 07:23 Posts: 175 Location: Australia Has thanked: 122 times Been thanked: 42 times
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Thought Id post any research I can find about the DDP-1 as I look at it...as there is so little info out there on this. Been researching the display today....frankly I do not know that much about LCD displays...so Im mostly learning as I go.. This unit uses a 16x2 Backlit LCD display..markings on the PCB are GEB-2294V-OS and on the other side DMI624 .... it uses two Sanyo Chips to drive-control the display being LC7930 and LC7985NA. Attachment:
DDP-1 LCD FRONTb.jpg [ 115.45 KiB | Viewed 6211 times ]
Attachment:
DDP-1 LCD BACKb.jpg [ 219.56 KiB | Viewed 6211 times ]
This LCD Display module seems to have been used in other Audio Equipment of the same period...including some Yamaha AVX DSP Models. I should be able to work out the pinouts as there are datasheets still for the Sanyo chips..so I should be able to check if correct Voltages are present. If there was a way to test the display that would be ideal to help see if the display is faulty or not that would be good ...I have power supplies...but have no way of feeding the display control data.
_________________ CLD-D770 OK CLD-2850 FLD,R201 CLD-D780 MHolder, PSU C12 CLD-2290 Digital Prob CLD-2590K Lots issues
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d770
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Post subject: Re: Yamaha DDP-1 No display need Service manual anyone Posted: 19 Jul 2020, 02:08 |
Serious fan |
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Joined: 19 Aug 2019, 07:23 Posts: 175 Location: Australia Has thanked: 122 times Been thanked: 42 times
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Tested Voltages along the display connector...+5V seen at driver/controller IC Sanyo LC7985NA Pin 33 Vdd and Pin 30 V5..no other Voltages on other Pins! Backlight has +3.9V. Display as seen when switched on: Attachment:
LCD display on-red.jpg [ 498.12 KiB | Viewed 6189 times ]
...research tells me this is a normal startup screen...so I expect the display is ok...at least part of the problem lays in the display not getting Control Signals. The PCB Microcontroller is an Hitachi HD6473238P10..which is still available today. Attachment:
microcontroller-sized.jpg [ 483.83 KiB | Viewed 6189 times ]
Checked +5v Supply Voltage present on Microntroller pin 39 and 14 - it is. Checked Voltages from each Regulator...all seem nominal! Starting to think we have a Processor failure. For Reference a Picture of the Complete PCB: Attachment:
DDP-1 PCB-red.jpg [ 491.69 KiB | Viewed 6189 times ]
_________________ CLD-D770 OK CLD-2850 FLD,R201 CLD-D780 MHolder, PSU C12 CLD-2290 Digital Prob CLD-2590K Lots issues
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d770
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Post subject: Re: Yamaha DDP-1 No display need Service manual anyone Posted: 19 Jul 2020, 02:38 |
Serious fan |
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Joined: 19 Aug 2019, 07:23 Posts: 175 Location: Australia Has thanked: 122 times Been thanked: 42 times
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For Reference - Whilst searching for more info with this unit found out How to get into the DDP-1 Test Mode - for those that might need to one day
To put the Yamaha DDP-1 in TEST MODE:
1. Plug unit into AC power and make sure unit is OFF.
2. Push both the MODE and MENU button simultaneously.
3. Push the POWER button ON.
The screen will show:
DDP DIAG V13 AC-3 DECODER
Then the screen will change after a second or two to:
1. PCM L/R :COAX DIR UNLOCK /A2
Now the MODE button can be used to change what is after the colon to:
RF, OPT, or COAX
The MENU button is used to bring up the settings for surround sound speakers, low frequency enhanced speaker, Pro-Logic input, AC-3 input, and test tone.
The PARAMETER button brings up a slew of other diagnostic and sound settings...
_________________ CLD-D770 OK CLD-2850 FLD,R201 CLD-D780 MHolder, PSU C12 CLD-2290 Digital Prob CLD-2590K Lots issues
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odotb3
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Post subject: Re: Yamaha DDP-1 No display need Service manual anyone Posted: 19 Jul 2020, 16:27 |
True fan |
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Joined: 27 Jul 2014, 20:59 Posts: 298 Location: North London Has thanked: 79 times Been thanked: 97 times
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d770 wrote: The PCB Microcontroller is an Hitachi HD6473238P10..which is still available today. Checked +5v Supply Voltage present on Microntroller pin 39 and 14 - it is.
This is the link to the datasheet for the Hitachi HD6473238P10Pins 14 and 39 are Vcc so the fact that you are seeing +5v is a positive and is probably an inidcation that this chip is ok. Pin 2 on the display is +5v. It looks like pin 3 is the negative voltage and should measure between 0 and -5v. Are you getting these voltages in reference to pin 1 ground?
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d770
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Post subject: Re: Yamaha DDP-1 No display need Service manual anyone Posted: 20 Jul 2020, 02:52 |
Serious fan |
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Joined: 19 Aug 2019, 07:23 Posts: 175 Location: Australia Has thanked: 122 times Been thanked: 42 times
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odotb3 wrote: Pin 2 on the display is +5v. It looks like pin 3 is the negative voltage and should measure between 0 and -5v. Are you getting these voltages in reference to pin 1 ground?
Display Pins Voltage Check Results: Pin 2 Checks at +5v Pin 3 0Volts seen, Pin 4 Checks at +5v All other Display Pins are sitting on 0Volts. Im not sure the Display Pinout info you found is correct ...this one has 14 pins?...similar but different perhaps...also Pin 3 is connected to VSS on Pin 16 of the Microcontroller. Connections between.... Display: Microcontroller: Pin 1 0V Pin 2 +5V Pin 3 <---------> Pin 48 Vss (0V) Pin 4 +5V Pin 5 <---------> Pin 16 Vss (0V) Pin 6 <---------> Pin 37 P76/RD Pin 7 <---------> Pin 47 P20/A8 Pin 8 <---------> Pin 46 P21/A9 Pin 9 <---------> Pin 45 P22/A10 Pin 10 <--------> Pin 44 P23/A11 Pin 11 <--------> Pin 43 P24/A12 Pin 12 <--------> Pin 42 P25/A13 Pin 13 <--------> Pin 41 P26/A14 Pin 14 <--------> Pin 40 P27/A15
_________________ CLD-D770 OK CLD-2850 FLD,R201 CLD-D780 MHolder, PSU C12 CLD-2290 Digital Prob CLD-2590K Lots issues
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d770
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Post subject: Re: Yamaha DDP-1 No display need Service manual anyone Posted: 20 Jul 2020, 13:41 |
Serious fan |
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Joined: 19 Aug 2019, 07:23 Posts: 175 Location: Australia Has thanked: 122 times Been thanked: 42 times
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odotb3 wrote: I feel like we are getting warmer. The only other thing I could suggest is to use a scope to see if you are getting an input pulse and an output pulse from the chip. Yep! Getting Late here so Tomorrow Im going to get out my old Oscilloscope ...and see if there is a clock pulse happening on pins 9 (XTAL) and pin 10 (EXTAL) And maybe Pin 24 (P47/E) - E clock/Enable...which Im not sure if its active...as I believe the controller to be in Single Chip Mode. If no clock seen then 'XL5' (crystal) probs dead. If clock..then its something else!
_________________ CLD-D770 OK CLD-2850 FLD,R201 CLD-D780 MHolder, PSU C12 CLD-2290 Digital Prob CLD-2590K Lots issues
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