RE-TM245P/eevblog_teardown

Note: This is copied from a 2018 EEVBlog post by Luiz Renault for posterity. https://www.eevblog.com/forum/manufacture/neoden-tm245p-teardown-and-upgrade/

post

Hi.

Tired of the painful process to setup the Neoden TM245P Pick and Place, I decided to make a mod to OpenPNP to export a CSV file compatible with the Neoden machine.

This way I can reuse component database and check if required components are present or need to be installed on free feeders.

But that isn't enough. I really want to install a vision system and make it compatible with OpenPNP to control the machine.

Today I opened the bottom plate and collected some information to check if the upgrade is possible using the original electronics.

Here I share my findings...

The guts of the TM245P consists of:

a motherboard (model TY164) with TFT LCD and resistive touch
a power supply and control board (model TY131)
two microstep driver
two vacuum pumps
one air blower
a transformer

The motherboard have a STM32F407ZGT6 and a RA8875L3N TFT LCD Controller. The SD card slot can be seen on the left side of the board. At the center there is a 26 pin IDC connector that goes to the power supply and control board. On the top a 3 pin SWD connector and on the right side a 2 pin connector that powers the vibration feeder can be seen.

The board uses as power supply 24V that comes from the power supply and control board. There is a 5V step down regulator (LM2576S-5.0) that supplies the uC through a 3.3V Linear reg. The 5V rail are sent back to the power supply and control board.

This is the microstep driver:

The power supply and control board have 4 diode bridge rectifiers (GBU808 on bottom layer) with +100V, +30V, +12V and -12V labels.

There are four step down regulators (LM2576T-ADJ): +30V->+24V, +30V->+24V, +12V->+9V e -12V->-9V

And the following connectors:

P1 -> Transformer (label 220V)
P2 -> air blower (connected to AC input)
P3 -> Transformer (label 110V)
P4 -> AC input and on/off switch
P5 -> Transformer taps labeled 70V, 23V, 11V, 11V
P6 -> To motherboard
P7 -> Power Supply to step controller X axis (connected to 100V labeled line)
P8 -> Power Supply to step controller Y axis (connected to 100V labeled line)
P9 -> X axis step controller signals (EN, DIR, STEP)
P10 -> Y axis step controller signals (EN, DIR, STEP)
P11 -> To DB9 connector at the back of the equipment (CAN-H CAN-L JTMS e JTCK
P12 -> Endstop Y axis switch
P13 -> Pick and place head
P14 -> Vacuum Pump A
P15 -> Vacuum Pump B
P16 -> Endstop / origin Y axis switch
P17 -> Feeder block 1
P18 -> Feeder block 2

The feeders and the head are controlled through a CAN bus connection. The same bus goes to the back DB9 connector.

This is the 26 pin connector pinout from the motherboard:

I tried to read the firmware but the uC have Level 1 Read Protection.

The next step is to log the CAN communication while sending simple commands using the equipment GUI.

Then I will check if the X and Y axis can be controlled through CAN messages.

Does anybody have the CAN message specification?

Anybody tried to mod this machine?

Best Regards,

Luiz Renault

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Hi today I placed a scope on the CAN_H and CAN_L signals on the DB9 back connector.

But they are too noisy to be useful and I had open the Pick and Place head and monitor on the inner (uC) side of the CAN transceiver (SN65HVD230).

I assumed a bit rate 512 kbit/s because the smallest pulse length.

But the oscilloscope wasn't able to decode it. The problem is that the CAN bit stuffing is not present.

Does anyone have any clue?

---

Although it uses a CAN transceiver, I could see on the Placement Head board that the CAN_TX and CAN_RX signals were connected to the USART signals of the STM32F103C8 (PA9 and PA10).

Then I was able to decode de USART 512kbit/s signal. It uses a binary format.