Thursday, January 05, 2017

Echo Dot – Specification – Disassembling procedure


SPECIFICATION 
1. Dual-band, dual-antenna 802.11 a/g/b/n Wi-Fi with MIMO
2.  Alexa Voice Search
3. 7-microphone array
4. Light ring volume adjustment
5. Bluetooth 4.0 for sending and receiving audio
6. 3.5 mm audio output for external speakers
DISASSEMBLING PROCEDURE 
Peel away the grippy rubber pad, fully expecting to find first screws
lower case simply clips in place, but when the first opening pick fails to pop it free, insert another.
First look inside reveals what sophisticated tech insiders will instantly recognize as a big metal thing.
This steel plate appears to be the culprit behind somewhat frustrated .
Fortunately, this metal thing has screws. Some long T6 Torx screws are threaded through the Dot from bottom to top.
It’s a speaker, albeit a small one. It connects to the Dot by way of a couple pairs of spring contacts.
It's not punchy enough for playing music, but it gives Alexa a way to talk back if your other speakers are turned off or disconnected.
With the screws removed, only a thin ribbon cable ties all these layers together.
At one end lies the motherboard and ports, while a separate board at the other end hosts the volume controls and microphone array. A single cable threads its way through the intervening layers to connect the two boards.
shuffle the layers of plastic and silicon back together temporarily; it's all coming apart soon enough
After tweezing away the ribbon cable, ready to inspect the motherboard.
Chips on one side, ports on the other. Here's what this motherboard is packing:
Texas Instrument DM3725 Digital Media Processor
Micron MT46H64M32LFBQ 256 MB (16 Meg x 32 x 4 Banks) LPDDR SDRAM
Samsung KLM4G1FEPD 4GB High Performance eMMC NAND Flash Memory
Qualcomm Atheros QCA6234 Integrated Dual-Band 2x2 802.11n + Bluetooth 4.0 SiP
Texas Instruments TPS65910A1 Integrated Power Management IC
Texas Instruments DAC
With disassembly nearly complete, tear into the control wheel. It's a dead ringer for the one we found in the original Echo, complete with its geared encoder wheel.
That's just fine by us, since it means at least some replacements parts can likely be shared between the original Echo and the Dot.
It also means servicing instructions for one will likely be echoed by the other. All in all, it's a win for fans of repair and bad puns everywhere.
We slap the control ring back together just long enough to see the encoder wheel doing its thing.
There's just something soothing about gears.
And buried in the top layer find another control board, functionally identical to the one we dug up in the original Echo.
# National Semiconductor LP55231 Programmable 9-Output LED Driver (x4)
# Texas Instruments TLV320ADC3101 92dB SNR Low-Power Stereo ADC (x4)
# Texas Instruments SN74LVC74A Dual Positive-Edge-Triggered D-Type Flip-Flops