valentinc

@BearBoy Thanks for pointing out, that gives some insight. When I asked the question of what MEM OVER and REC ERR mean, I was wondering what is exactly triggering these errors (so I can narrow it down) but wasn't specific enough in my question. It's to be mentioned there is no external vibration and device is sitting flat on a desk while testing it. So any potential vibration is certainly self-generated. However there is no vibration I can feel. Still question is what's the unit actually detecting which trigger these errors ? Since from my understanding there is no feedback during recoring, like the unit isn't reading what has been written in real time. Is this correct ? @sfbp Updates I have so far are as follows: seems I missed one adjustment (which was written below charging voltages in the manual, so I didn't see it initially) and another one was not stored in memory. After re-checking all the values and adjusting them to spec, there is a difference although not a fix. Unit can, at times, record without giving the REC ERR, but more often than not it gets stuck in the ToC Edit phase even when it does record. Also another aspect to mention is recordings done do have distorsion every 10-20seconds of play, indicating a high error rate. To me this spindle speed constantly going up and down during recording seems abnormal and I think may be related to the problem ? This seems to be different when the unit is actually recording, in the sense there's a higher duty cycle (more constant spinning compared to spin-up).

@sfbpThe measurements I have posted are with 1.5V at the sidecar terminals, not the DC in jack. It was easier to put some crocodile clips there. The room temperature is 24-25°C, so don't think this would need any adjustment. In regard to seeking noise, you're reffering to the spindle speed going up and down ? Is this normal ? Haven't noticed it on other units (that actually work on recording) like N710 for example. I also don't notice it on playback. Went ahead and adjusted the voltages (the ones that were off) at 1.5V main supply just to see what happens. Wrote down the original values also. While initially I was able to record 2 discs fine, the situation came back to what it was initially after that. Also noticed the MEM OVER error didn't actually disappear but it's rather intermittent. What do MEM OVER and REC ERR actually mean ? Couldn't find any info about this online. What I have noticed in reagard to voltage rails is, the VCO ones do drop quite significantly when main rail drops (for example 1.2V instead of 1.5V). On the other hand, rest of them remain pretty stable even down to 1.1V. Will test if giving it 3V to the DC in jack and re-adjust all the voltage to this. Will post the conclusions later on. As far as the gumstick + sidecar, indeed they are separated only by a small value resistor (20mΩ). If both are used, one cell will charge the other until voltages become equal.

Unit is not plugged into an AC adapter (do not have one), but used with an AA NiMH on sidecar. Have tried recording with unit powered by AA alkaline and lab power supply (1.5V) and behavior is exactly the same. Ended up measuring all voltages (except charging) and they are as follows (unit powered with 1.5V): VC1 L - 2.3428V (spec 2.35V +/-5mV) - out of tolerance VC1 H - 2.7423V (spec 2.75V +/-5mV) - out of tolerance VC2 Lo - 1.423V (spec 1.3V +/-5mV) - out of tolerance VC2 Hi - 2.543V (spec 2.55V +/-5mV) - out of tolerance REG1 - 2.15V (spec 2.15V +10mV -5mV) - within tolerance REG2 - 2.198V (spec 2.2V +10mV -5mV) - within tolerance REG3L1 - 1.1936V (spec 1.2V +/-5mV) - out of tolerance REG3L2 - 1.196V (spec 1.2V +/-5mV) - within tolerance REG3H - 1.5442V (spec 1.55V +/-5mV) - out of tolerance VREC L - 1.1215V (spec 1.12V +25mV -10mV) - within tolerance VREC M - 1.222V (spec 1.22V +25mV -10mV) - within tolerance VREC H - 1.4908V (spec 1.52 +60mV -10mV) - out of tolerance Since the test points are on the back side of the board it's hard to test with battery, but can test with lower voltage. In regard to seeking noise, are you reffering to noise during recording ?

Hello everyone ! Have been struggling with a MZ-N910 that reads discs perfectly, but is unable to record. Symptoms are the following: - in analog input mode, the recording starts but after 1min or so it throws REC ERR error; - in netMD mode, the recording starts but progress remains stuck; - spindle speed can be heard going constantly up and down, like a CD player struggling to read the disc; After lubricating the spindle motor (watch oil), I managed to get a full disc recording when unit sat upside down. However was unable to consistently reproduce this behavior. Before lubricating the spindle motor, unit was also throwing a MEM OVER error which has disappeared now. Checking the unit for stored errors, I found this (see picture attached). However after clearing the errors, they do not re-appear.