Question about Sony PCMM10 Voice Recorder
From: The Taperssection Forum
maybe I can offer an explanation why some people have the RTC problem and others have not. After leaving my M10 on the shelf for about two months without switching it on (batteries were still fully charged!), I had to set the clock.
So I wondered what is going on. I pulled out the schematic of the M10s big brother, the D50.
The power supply section is rather complicated with lots of MOSFET switches and regulators, even one for the RTC battery. Checking the component values, I guesstimate that it takes about 30 to 40 hours to recharge an empty RTC battery - the state of the battery is in when you are asked to set time and date. If fully charged, you can expect 2000-3000 hours of RTC operation.
It seems to me that the D50 (and probably the M10) switch off completely when battery powered - not even the RTC battery is recharged!
So it depends on your use profile whether you have the dreaded "set date and time" problem or not. Regular use (best every day) keeps the RTC battery charged. in the future, I will let it go into sleep mode, and not switch it off. Another solution is to plug in the power supply before storage and let the M10 run for two days to top off the RTC battery, this should be sufficient for two months.
BTW if someone could send me a schematic of the M10, I could replace my educated guess with fact.
Posted on Sep 07, 2011
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Posted on Jan 02, 2017
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If you cannot access the machine after if has been powered up, it is still possible to get past the BIOS password. The BIOS password is stored in CMOS memory that is maintained while the PC is powered off by a small battery, which is attached to the motherboard.
If you remove this battery, all CMOS information (including the BIOS password) will be lost. You will need to re-enter the correct CMOS setup information to use the machine. The machines owner or user will most likely be alarmed when it is discovered that the BIOS password has been deleted.
On some motherboards, the battery is soldered to the motherboard, making it difficult to remove.
If this is the case, you have another alternative. Somewhere on the motherboard you should find a jumper that will clear the BIOS password.
If you have the motherboard documentation, you will know where that jumper is. If not, the jumper may be labeled on the motherboard. If you are not fortunate enough for either of these to be the case, you may be able to guess which jumper is the correct jumper. This jumper is usually standing alone near the battery. If you cannot locate this jumper, you might short both of the points where the battery connects to the motherboard.
If all else fails, you may have to clear the BIOS password by resetting the RTC (Real Time Clock) IC (Integrated Circuit) on your motherboard.
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