This service manual explains how to replace and inspect the heating element and sensor of the Bakon VH90/VH120 high‑frequency eddy‑current soldering iron.
The manual provides step‑by‑step instructions for removing the heating element, sensor and related components from the high‑frequency soldering iron. It details how to unfasten the screw, pull out the steel jacket, and extract the heating element using a heat‑resistance pad instead of metal tools.
After replacement, the document describes the required checks: measuring resistance values between specific pins to ensure they are infinite, and verifying that the resistance of the heating element and sensor match the normal ranges listed in the table. It also advises on cleaning oxidized contacts with sandpaper or steel wool when necessary. This manual is written in Chinese.
| Damage resistance threshold (pin4‑pin5) | <2 Ω (damage) |
|---|
Measure the resistance between pins a and b; if the value differs from the normal range (<4 Ω), the heating element must be replaced.
Use a heat‑resistance pad instead of metal tools such as pliers to pull out the heating component.