DI
Posted July 23, 2022 at 17:05 GMT
Edited July 23, 2022 at 17:06 GMT
Edited July 23, 2022 at 17:06 GMT
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Beogram 8002 stops short
19 replies
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I have made some progress. This table didn't turn on at all when I got it. I replaced all the caps and clean al the mechanicals to get to this point. It spins and locks on speed. I tested with a rpm tool. The carriage moves pretty freely in both directs. The part I'm stuck at is the arm stops short. It makes it to the same spot every time I press play and will just sit there spinning. It won't respond to stop from this state. It will only respond to stop if play was never started. I did replace the led on the encoder and get pulses from the diode readers. I'm not sure what else to check.
https://imgur.com/a/hwIH6df
https://imgur.com/a/hwIH6df
You start a Beogram to play without a record?
Nice, you will destroy the MMC if it continues.
That's a safety feature.
Nice, you will destroy the MMC if it continues.
That's a safety feature.
Hi,
This should be in the Workbench, where it’s really at as regards repairs.
Check your connections, and the bulbs, especially the one in the control panel, and if good, check adjustment as per service manual (5-3).
This should be in the Workbench, where it’s really at as regards repairs.
Check your connections, and the bulbs, especially the one in the control panel, and if good, check adjustment as per service manual (5-3).
Jacques
Everything in the control panel has been replaced and adjusted to spec. New bulb and photo sensors went in. It seems like an issue with the rotary encoder. The arm moves for a couple seconds before it stop. I'm going to check the connections between the encoder and cpu again when I have free time.
I remember I had to replace the IR diode in one of my decks. An easy task, if it comes to that!
Jacques
Have you performed the service manual adjustment for the forward and reverse scanning control buttons?
Both should measure around 620 mV at their steady-state (not pressed) position.
If those are adjusted correctly then perhaps you do have a problem with one of the position sensors.
Those can be replaced if necessary. I believe Martin has a replacement part at the Beoparts store.
The source of the problem could still be elsewhere though.
To see what is going on for sure you would need to attach some probe wires to measure what the various sensors are actually doing.
-sonavor
Both should measure around 620 mV at their steady-state (not pressed) position.
If those are adjusted correctly then perhaps you do have a problem with one of the position sensors.
Those can be replaced if necessary. I believe Martin has a replacement part at the Beoparts store.
The source of the problem could still be elsewhere though.
To see what is going on for sure you would need to attach some probe wires to measure what the various sensors are actually doing.
-sonavor
Sorry, I didn't read the previous threads closely.
It sounds like you have set the steady-state levels on the scanning buttons where the LDRs measure 620 mV.
I would connect an oscilloscope to the sensor signals and see if any are showing any signs of problems.
Here are the sensor measurements I captured on a Beogram 8002 a little more than a year ago. The oscilloscope measurements are towards the end of the post. There are also photos of where the test probe wires are soldered to.
-sonavor
It sounds like you have set the steady-state levels on the scanning buttons where the LDRs measure 620 mV.
I would connect an oscilloscope to the sensor signals and see if any are showing any signs of problems.
Here are the sensor measurements I captured on a Beogram 8002 a little more than a year ago. The oscilloscope measurements are towards the end of the post. There are also photos of where the test probe wires are soldered to.
-sonavor
I have replaced the emitter diode on the encoder. I can't find the correct part for the 2 receivers.
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