Detection of the chip with a switch continuous potentiometer: For the chip with a switch potentiometer, in addition to the above method should be detected in the nominal potential of the chip potentiometer and contact, but also to detect whether the switch is normal.
First rotating potentiometer shaft handle, check whether the switch is flexible, connected, disconnected when there is crisp "creak" sound, with a multimeter R * 1 block, two table pen in the conductive plastic rotary potentiometers switch, respectively, two external welding On-chip, turn the potentiometer handle, so that the switch connected to the multimeter on the resistance value should be changed from infinity to 0 ohms in the "off" for the location of resistance is not infinite, then the chip potentiometer switch is damaged.