ZT-2, ZT-3, ZT-1-CLS-DPU, Hakko FR-301, Quick861DW
Model: ZT-2, ZT-3, ZT-1-CLS-DPU, Hakko FR-301, Quick861DW
Ace: Needed ().
Location: PCB Lab
The Rework Station is essential for fixing what you messed up during the fabrication process. Consisting of an Air Bath, Air Pencil, and Air Pick, the Rework Station allows you heat up a specific area of the PCB and make modifications, whether that means adding/removing some solder on the pads, rotating a component, or completely replacing a component. Other tools are available for similar purposes, such as a desoldering gun, and an additional heat gun for larger components.
The Airbath can heat up to 205 °C, which is not enough to melt the solder on a PCB, but it is close. Solder will melt at higher temperatures than this, which can be achieved using the Air Pencil and/or Heat Gun. Essentially, the Air Bath heats up the board and the Air Pencil finishes the job by heating up the are of the part that we want to fix. This is where the Air Pick comes in. After heating up the part we want to fix, the Air Pick uses a vacuum to pick up the component off the board. If the component is too small, using tweezers to pick up the component is a good alternative.
To show a complete knowledge of the Air Bath, Air Pencil, Air Pick, Desoldering Gun, and Heat Gun, the student will have a PCB prepared and perform tasks with the station as a whole. Using the Air Bath, Air Pencil, and Air Pick, students will remove a SMD and solder it back on. Using the Desoldering Gun, students will remove a soldered through hole component. Using the Heat Gun, students will mount a larger SMD, solder it on, and then remove it.
- Fixing/Replacing SMD Components
- Before turning on the Air Bath, clamp the PCB on the black stand, preferably placing it so that the component you want to fix is directly above the air.. You should not be able to move the board once it is clamped. Keeping it sturdy helps from accidentally moving the PCB during the reworking process.
- Now you will heat up the Air Bath. Hit the Power switch on the front, and set the temperature about 20-30 °C below the solder's melting point. The melting point for your solder can be found using the table below. Voltera's Solder Paste (Orange) melts at lower temperatures than the Sn63Pb37 Solder Paste (Blue). If the Voltera Solder Paste says T4 at the top, heat the Air Bath to 180 °C. If the Voltera Solder Paste says T5 at the top, heat the Air Bath to 150 °C. If you are using the Sn63Pb37 Solder Paste, heat the Air Bath to 150 °C.
- Once the board is heated, you can use the Air Pencil to heat up a specific component. The pencil blows hot air out the end. When you turn it on, adjust the settings to be 3/4 of the heat capacity and about 1/3 of the air flow. We do this because when the air flow is maximized at full temperature, it does not get hot enough to melt the solder.
- Hold the tip of the pencil over the SMD you want to solder/desolder, and move it slightly around the leads to allow for more distribution of heat. If it is not heating it up, try turning the heat of the pencil higher. This should allow for your SMD components solder to melt, and you will be able to pick up the component up with a pair of static-safe tweezers or the Air Pick. If you are soldering a part on, make sure to generously apply flux to the pads, and make sure all the solder sticks to the pads after heating.
- If the pencil is not doing a good enough job to heat up the component, then you may graduate to using the bigger heat gun. The same theoretical concepts apply.
- The Air Pick uses a vacuum to pick up and place components. Typically you would use both hands for this; one hand heats up the component with the pencil and the other grabs the component with the pick.
- On the handle of the pick there is a divot that is connected to the vacuum. When you plug the divot with your finger, it will enable it to pick up a component. When you release your finger from the divot, it will let go of the component. There are different tips that you will place on the end of the tip based on the component you want to pick up, each having a different size for varying components.
- Desoldering Through Hole Components
Specific Maintenance Tasks
|Maintenance Procedure||Frequency||Done By|
The current Ace of the Rework Station is Needed ().
What is the Rework Station?
The rework station is a collection of tools used for heating up printed circuit boards to remove surface mount components or touch up soldering jobs. The tools vary from a board heater, to very precise pin-point heating tools.
PCB - Printed Circuit Board
SMD - Surface Mount Device
SMT - Surface Mount Technology
Heat Gun- A soldering iron-like tool that blows out hot air through a variable sized hole (often variable through interchangeable tips).
Helping Hands - A tool that grabs onto your PCB with little clips.
Soldering - The process of melting a tin-lead compound of metal to secure pins and leads of electronic components onto the terminals of a printed circuit board.