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Recovery off an RadioShack Answering Machine 43-3825 http://forum.hddguru.com/viewtopic.php?f=10&t=36618	Page 1 of 1

Author:

Giroot [ March 27th, 2018, 12:38 ]

Post subject:

Recovery off an RadioShack Answering Machine 43-3825

Hello,
I was wondering if it was possible to recover deleted voice messages off this kind of answering machine.

From the pictures attached, I cannot see any memory chips inside that would store the messages, although I have not looked underneath the pcbs yet.

Attachment:

File comment: Bottom of the answering machine.

8.jpg [ 3.26 MiB | Viewed 9894 times ]

I can see one microcontroller (marked in red)
Markings:
EM78P153SP
0347N DP3BC4
Datasheet:http://www.emc.com.tw/chs/database/Data_Sheet/8BIT/EM78P153S.pdf

The other chip (marked in blue)
Markings:
PC-17T1
0347
DD
Datasheet:https://www.digchip.com/datasheets/download_datasheet.php?id=745872&part-number=PC-17T1

If anyone can help identify the other parts on the PCB that would be much appreciated!

Attachments:

File comment: top part of the answering machine. most likely for the buttons on the machine, and the lcd screen

unnamed.jpg [ 2.98 MiB | Viewed 9894 times ]

Author:	fzabkar [ March 27th, 2018, 22:56 ]
Post subject:	Re: Recovery off an RadioShack Answering Machine 43-3825
If there is an FCC ID on the label (eg AAO43-3825), then there may be a circuit diagram at the FCC's database. This would be unlikely, though. Otherwise, RadioShack used to provide parts lists at its support site. You might like to try the Wayback Machine. http://support.radioshack.com BTW, PC-17T1 is an optocoupler. It would isolate the AC ringer (90VAC) from the electronics.

Author:

Giroot [ March 27th, 2018, 22:59 ]

Post subject:

Re: Recovery off an RadioShack Answering Machine 43-3825

Alright. I've looked underneath the bottom pcb, and it's looks a lot more promising.

Chip to the side markings are
CW417403-6
CJ 0323

Also, does anyone have a datasheet for the DSP chip?
DSP
DL16328PAC11AQC
2001 DSPG
TME693B0002A 0344
SIC0708Y

Thanks,

EDIT: @fzabkar, Thanks for the info!

Attachments:

back under crop.jpg [ 3.74 MiB | Viewed 9886 times ]

Author:	fzabkar [ March 27th, 2018, 23:48 ]
Post subject:	Re: Recovery off an RadioShack Answering Machine 43-3825
I suspect that the DL16328PAC11AQC chip was made by the DSP Group: https://www.dspg.com/ That would account for the "2001 DSPG" copyright marking ... and the logo. I'm wondering whether the CW chip might be a RAM, and whether there is any flash memory at all. The 9V battery may be the backup for more than just the clock.

Author:	fzabkar [ March 28th, 2018, 1:27 ]
Post subject:	Re: Recovery off an RadioShack Answering Machine 43-3825
The links are dead, but try the Wayback Machine. Owner's Manual for Radio Shack Answering machine TAD-3825, cat# 43-3825, TAD-3825: http://support.radioshack.com/support_p ... /72809.pdf Parts List: http://support.radioshack.com/support_p ... /72743.htm

Author:	HaQue [ March 28th, 2018, 8:45 ]
Post subject:	Re: Recovery off an RadioShack Answering Machine 43-3825
CW chip: The only chip manufacturer I could find that logo comes close is Calibre Inc. They were bought by Zilog in 2000. They mainly did wireless stuff, IR, Bluetooth etc. Possible as on one of the pics there is a sticker "remote code". But I don't know if it is a red herring, as you used to use a code to operate answering machine from a remote telephone back then. Attachment: calibre.png [ 2.16 KiB \| Viewed 9823 times ] Possible the chip does DTMF tones or is an ADC. here are 2 manuals for similar (not the same) products. I couldn't see a whole lot extra info able to be gleaned from them 43-3829 Attachment: 43-3829.pdf [927.06 KiB] Downloaded 426 times 43-3888 Attachment: 43-3888.pdf [126.3 KiB] Downloaded 455 times you may be able to get some info by searching for schematics/photos circa the date of your unit. match up similar looking circuits with chip functions. could you post pic of outside of unit and model sticker

Author:	fzabkar [ March 28th, 2018, 8:55 ]
Post subject:	Re: Recovery off an RadioShack Answering Machine 43-3825
Quote: If AC power fails or you unplug the system, one 9V alkaline battery (not supplied) is needed to save any recorded messages and the settings for the day and time.

Author:	HaQue [ March 28th, 2018, 9:17 ]
Post subject:	Re: Recovery off an RadioShack Answering Machine 43-3825
Yes, I think the absence of flash memory, unless it is in the DSP chip, and that statement.. not a lot of hope

Author:	fzabkar [ March 28th, 2018, 9:51 ]
Post subject:	Re: Recovery off an RadioShack Answering Machine 43-3825
@Giroot, if you disconnect the AC adapter and install the 9V battery, can you measure a supply voltage at the CW chip? HaQue wrote: could you post pic of outside of unit and model sticker https://www.ebay.com.au/itm/Radio-Shack ... _606wt_264 http://i.ebayimg.com/images/g/55IAAOSwo ... -l1600.jpg http://i.ebayimg.com/images/g/q88AAOSwt ... -l1600.jpg http://i.ebayimg.com/images/g/Q8wAAOSwa ... -l1600.jpg http://i.ebayimg.com/images/g/cagAAOSw2 ... -l1600.jpg http://i.ebayimg.com/images/g/RboAAOSwa ... -l1600.jpg http://i.ebayimg.com/images/g/toQAAOSwt ... -l1600.jpg http://i.ebayimg.com/images/g/O-oAAOSw2 ... -l1600.jpg

Author:	Giroot [ March 29th, 2018, 13:14 ]
Post subject:	Re: Recovery off an RadioShack Answering Machine 43-3825
Thanks for your help everyone! fzabkar wrote: HaQue wrote: could you post pic of outside of unit and model sticker https://www.ebay.com.au/itm/Radio-Shack ... _606wt_264 http://i.ebayimg.com/images/g/55IAAOSwo ... -l1600.jpg http://i.ebayimg.com/images/g/q88AAOSwt ... -l1600.jpg http://i.ebayimg.com/images/g/Q8wAAOSwa ... -l1600.jpg http://i.ebayimg.com/images/g/cagAAOSw2 ... -l1600.jpg http://i.ebayimg.com/images/g/RboAAOSwa ... -l1600.jpg http://i.ebayimg.com/images/g/toQAAOSwt ... -l1600.jpg http://i.ebayimg.com/images/g/O-oAAOSw2 ... -l1600.jpg Yes, that's the correct model

Author:	Giroot [ April 9th, 2018, 20:11 ]
Post subject:	Re: Recovery off an RadioShack Answering Machine 43-3825
Quote: If AC power fails or you unplug the system, one 9V alkaline battery (not supplied) is needed to save any recorded messages and the settings for the day and time. HaQue wrote: Yes, I think the absence of flash memory, unless it is in the DSP chip, and that statement.. not a lot of hope Final Update: Decided to not continue forward with this one, due to these statements. The lack of a memory chip makes recovery too difficult. Thanks for the help everyone.

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