Most robotics PCB copy requests are not about copying a board to sell. They come from someone holding a dead servo drive, joint controller, or teach pendant board for a robot that is out of support, with no schematic, no Gerbers, and a machine sitting idle. The work is a full reverse engineering job: recover the layout and stackup, identify every part, capture the schematic, and — usually the part people forget — get the firmware and calibration data across so the rebuilt board behaves like the original.
That last point is what separates robotics from most other board work. A cloned power supply either regulates or it doesn’t. A cloned servo axis can pass a continuity check and still run the joint into a hard stop.
The boards that actually show up
Robotics is a wide word, so the boards vary a lot. In practice, requests cluster into a handful of types, and each one drives the job in a different direction.
- Servo and motor drive boards. Three-phase inverter stages with MOSFET or IGBT half-bridges, isolated gate drivers, shunt or Hall current sensing, DC bus caps, and a DSP or Cortex-M controller. Heavy copper on the power side, tight analog on the sense side.
- Encoder and feedback interface boards. RS-422 differential receivers, serial absolute encoder protocols, resolver-to-digital conversion, and sometimes a CPLD or small FPGA doing the position decode. Small boards, disproportionate difficulty.
- Joint and axis controllers. Multi-axis control with CAN, CANopen, or EtherCAT, a brake driver, an STO or safety-relay section, and a battery-backed absolute position memory.
- Fieldbus and backplane boards. EtherCAT slave controllers, PHYs and magnetics, 100-ohm differential pairs, and connectors that have to line up with an existing rack.
- End effector, gripper, and sensor boards. Force-torque bridge amplifiers, proximity and vision interface boards, and flex or rigid-flex boards that fold into a wrist or a cable channel.
- HMI and teach pendant boards. Membrane keypads, enable switches, LCD interfaces, and a lot of connectors.
When you ask for a quote, tell us which of these you have. “Robot controller board” covers a $60 I/O card and a 40-amp drive stage, and those are not close to the same job.
How a robotics PCB copy job actually runs
Board intake and imaging
The board is photographed as received, top and bottom, with the connectors and any date codes visible. We log every reference designator we can read, then scan both outer layers at high resolution to get an accurate outline, hole pattern, and pad geometry. Board thickness, copper weight, and finish get measured, not guessed — on a drive board the copper weight is part of the design, and IPC-2152 makes it clear that current capacity depends on it.
Layer separation
Robotics boards are commonly four to eight layers. The inner layers are recovered by controlled removal of one layer at a time, imaging each one before moving to the next. Ground and power planes matter here: on a servo drive, the split between the power ground and the control ground, and where the single tie point sits, is a design decision that will show up as noise on the current loop if it’s copied wrong.
Buried and blind vias, when present, get confirmed with X-ray imaging before the board is sectioned, so the stackup we reconstruct matches what the manufacturer actually built rather than what looks likely from the outside.
Component identification
Passives are measured and cross-checked against the schematic context. Actives are read from the marking where possible; where markings are worn, sanded, or house-coded, we work back from the pinout, package, and what the surrounding circuit demands. Robotics boards are full of parts that are hard to pin down: isolated gate drivers, current-sense amplifiers with specific common-mode ranges, encoder line receivers, and the occasional custom-marked motor control ASIC.
Schematic capture and verification
The netlist comes out of the layer images, then gets checked against the physical board with a meter — point-to-point on the nets that matter, especially gate drive paths, current sense returns, safety chains, and anything crossing an isolation barrier. The schematic is drawn in functional blocks, not as a copper dump, because the person maintaining this board later needs to read it.
Firmware and calibration
This is where robotics differs most. A drive or joint board typically holds two separate things: the program image in the MCU or DSP, and per-unit data in EEPROM or backed-up RAM — encoder offset, joint zero, gain tables, gear backlash compensation, sometimes a serial number the controller checks. Copying the program and skipping the calibration gives you a board that boots and moves wrong.
If the original device is readable, the calibration region gets dumped and preserved separately from the firmware. If the controller is locked, feasibility depends entirely on the part and its protection state — a code security password on a C2000-class DSP, read-out protection on an STM32, or lock bits on an older 8-bit part are all different problems. We evaluate the specific chip before quoting rather than promising anything, and firmware recovery for a locked robotics controller is always priced and scheduled as its own line item.
What drives cost and lead time on robotics boards
| Board type | Typical build | What makes it slower |
|---|---|---|
| Gripper / sensor interface | 2–4 layers, low part count | Flex sections, bridge amplifier accuracy, tiny passives |
| I/O and relay cards | 2–4 layers, many connectors | Mostly volume of nets, rarely difficult |
| Encoder / feedback board | 4 layers, CPLD or FPGA | Programmable logic contents, proprietary serial protocols |
| Servo / motor drive | 4–6 layers, heavy copper | Isolation layout, current sense accuracy, potted or coated sections |
| Axis controller with fieldbus | 6–8 layers, BGA | Inner-layer imaging, controlled impedance, BGA rework and
Working on a board like this?Send the chip marking or two photos. You get feasibility, lead time and price within 24 hours, and the check costs nothing. Get a free quoteRelated reading |