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Brother PT-E300 Industrial Label Machine Teardown

Tape Installed
Tape Installed

Here a tape is installed in the printer. This unit can handle tape widths up to 18mm. The pinch rollers are operated by the white lever at the top of the image, which engages with the back cover.

Li-Ion Battery
Li-Ion Battery

This printer is supplied with a rechargeable battery pack, but AA cells can be used as well. Some of the AA battery terminals can be seen above the battery.

Battery Specs
Battery Specs

Pretty standard fare for a 2-cell lithium pack. The charging circuitry doesn’t appear to charge it to full voltage though, most likely to get the most life from the pack.

Cartridge Slot
Cartridge Slot

With the cartridge removed, the printer components can be seen. As these cartridges have in effect two rolls, one fro the ribbon & one for the actual label, there are two drive points.

Pinch Rollers & Print Head
Pinch Rollers & Print Head

The thermal print head is hidden on the other side of the steel heatsink, while the pinch rollers are on the top right. The plastic piece above the print head heatsink has a matrix of switches that engage with holes in the top of the label cartridge, this is how the machine knows what size of ribbon is fitted.

Mainboard
Mainboard

Most of the internal space is taken up by the main board, with the microprocessor & it’s program flash ROM top & centre.

Charger Input
Charger Input

The charger input is located on the keyboard PCB just under the mainboard, which is centre negative, as opposed to 99% of other devices using centre positive, the bastards.

LCD Module
LCD Module

The dot-matrix LCD is attached to the mainboard with a short flex cable, and from the few connections, this is probably SPI or I²C.

Print Mech Drive
Print Mech Drive

The printer itself is driven by a simple DC motor, speed is regulated by a pair of photo-interrupters forming an encoder on the second gear in the train.

Battery Holder Connections
Battery Holder Connections

The back case has the battery connections for both the lithium pack & the AA cells, the lithium pack has a 3rd connection, probably for temperature sensing.

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MingHe D3806 Buck-Boost DC-DC Converter

DC-DC Converter
DC-DC Converter

Here’s a useful buck-boost DC-DC converter from eBay, this one will do 36v DC at 6A maximum output current. Voltage & current are selected on the push buttons, when the output is enabled either the output voltage or the output current can be displayed in real time.

Display PCB
Display PCB

Here’s the display PCB, which also has the STM32 microcontroller that does all the magic. There appears to be a serial link on the left side, I’ve not yet managed to get round to hooking it into a serial adaptor to see if there’s anything useful on it.

Display Drive & Microcontroller
Display Drive & Microcontroller

The bottom of the board holds the micro & the display multiplexing glue logic.

Main PCB
Main PCB

Not much on the mainboard apart from the large switching inductors & power devices. There’s also a SMPS PWM controller, probably being controlled from the micro.

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Sony Xperia T Teardown

Back Cover Removed
Back Cover Removed

Since this phone has been in my drawer for some time, I figured it was time for a teardown. (It’s never going to see any more use).
The back cover on these phones is easily removed, as it’s just clipped on.

Motherboard
Motherboard

Once the back cover is removed, the Li-Polymer cell is exposed, along with the logic board. Pretty much all of the PCB is under RF shields.

Motherboard Removed
Motherboard Removed
Battery Management
Battery Management

Under the small RF can on the back of the board is the battery management circuitry & the charger. There’s an extra connection to the cell for temperature monitoring. Just under that circuitry is the eMMC flash storage.
Just to the left of the battery circuit is the NFC transceiver IC, from NXP.

Battery Flex
Battery Flex

The cell is connected to the main board with a FFC, with a very small SMT connector, although not as small as the more modern Xperia series phones.

RF Section
RF Section

The other side of the mainboard holds the large RF transceiver section, with a Qualcomm RTR8600 multiband transceiver IC. In the bottom corner is a Skyworks SKY77351-32 Quad-band power amplifier IC, along with 3 other power amplifier ICs, also from Skyworks.

Gyro & Audio Codec
Gyro & Audio Codec

The top corner of the board holds the various sensors, including an Invensense MPU-3050 3-axis gyro. To the right of that is the Audio Codec, a WCD9310 from Qualcomm.

Logic & CPU Section
Logic & CPU Section

Everything is controlled from the last section on the board, with the main CPU & RAM in a PoP (Package-On-Package) configuration. Under the main CPU is the main power management IC, also from Qualcomm. No datasheet for this one unfortunately, but it gives it’s purpose away by being surrounded by large inductors & capacitors.