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DT-500 malfunction.

69Z28Gary

69Z28Gary

AK Subscriber
Subscriber
I have a question for the Pioneer guys that mess with the digital timers. Most of my equipment has been sparingly used the past few decades. Life gets in the way sometimes. I have a DT-500 that seems to want to run fast. It's a switchable model between 50 and 60 hz. I moved the switch back and forth to see if there was anything there that might make that happen, and that didn't change anything. I was thinking DeoxIT D5 may work, I just haven't gotten any yet to see if that would do it. Anything else I can look at? Near as I can tell, after I reset the time, it runs as it should for about an hour give or take, and then it wants to run fast. I'm guess here but probably runs fast by a few minutes or more per hour. Not a lot, but I haven't sat and watched how much time it increases for an hour of run time. But, it does run fast until I reset it again. Anything I can do myself or is this a job for a tech? Thanks for looking. Gary.
 
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eiraved said:
After switching it between 50 and 60 hz, did you power the unit down and power it up to try again?
Click to expand...
No I haven't, but now that I know, I will do that. Should it still be plugged in to do this or unplugged? I had it connected straight to a wall receptacle the last check I made a few days ago, but I read somewhere to plug into a surge protector, and make sure it's one that isolates the signal from the wall receptacle or something to that affect. I've had it in several different locations in my life, Texas, Georgia, and Delaware now, and it still did it. So I'm up for plugging into one of those protector units. I'll give a try now.
 
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My DT-510 was doing similar things. Someone recommended removing the 50/60 hz switch if you live in a country that uses 60 hz (USA, for example). I did that and it corrected the problem for several months then the proble returned. There's a thread on jumping the MN6076. That solved my problem:

1mike161

Thread 'Correcting Display Instability and Speed Issues: DT Timers'

The following instructions describe how to solve display instability (mode flicker) and clock speed accuracy problems that can occur with Pioneer DT series timers. These problems are due to failing internal resistors of the MN6076 clock chip. The solution is to add four 10K Ohm 1/8 Watt external resistors to the mode select and line frequency select inputs.

All 4 resistors have one end tied together, and then tied to pin 27 of the chip. Then, the other end of the resistors are to be tied, individually, to the following pins: 29, 30, 31, and 36. That should solve most issues with these...
 
eiraved said:
After switching it between 50 and 60 hz, did you power the unit down and power it up to try again?
Click to expand...
Nothing changed. I pressed the second's reset button and stayed there and if I'm reading it right against my cellphones world time it gains 10 to 11 seconds in a minutes time.
 
bzb882 said:
My DT-510 was doing similar things. Someone recommended removing the 50/60 hz switch if you live in a country that uses 60 hz (USA, for example). I did that and it corrected the problem for several months then the proble returned. There's a thread on jumping the MN6076. That solved my problem:

1mike161

Thread 'Correcting Display Instability and Speed Issues: DT Timers'

The following instructions describe how to solve display instability (mode flicker) and clock speed accuracy problems that can occur with Pioneer DT series timers. These problems are due to failing internal resistors of the MN6076 clock chip. The solution is to add four 10K Ohm 1/8 Watt external resistors to the mode select and line frequency select inputs.

All 4 resistors have one end tied together, and then tied to pin 27 of the chip. Then, the other end of the resistors are to be tied, individually, to the following pins: 29, 30, 31, and 36. That should solve most issues with these...
Click to expand...
Something like that would make me quite nervous to do, so I'll leave that for someone that is confident enough to do it. Just need to find somebody now that can. Thanks for the link. Is my problem the same? I'm not sure. Probably better to hand it off to someone that understands it better than I. Plus, I've never soldered anything in my life, so there's that.
 
69Z28Gary said:
I was thinking DeoxIT D5 may work, I just haven't gotten any yet to see if that would do it.
Click to expand...
Have you attempted the DeoxIT yet?
If you haven’t, Deoxit your push button and selector switches as well as the 50/60 switch.
If you have a voltage selector switch, make sure it’s set at 120v if you’re in the US.
 
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eiraved said:
Have you attempted the DeoxIT yet?
If you haven’t, Deoxit your push button and selector switches as well as the 50/60 switch.
If you have a voltage selector switch, make sure it’s set at 120v if you’re in the US.
Click to expand...
Not yet, I have to pick some up at the store. Not sure where to get it from though. Actually, the volt was set to 110, so I moved it to 120. I'll get the DeoxIT-D5 correct?
 
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