STC30 Plus (v4.1) Transformer
(Rev 1.0 8/8/08)
Corporate Headquarters:
1080 North 11th Street, San Jose, CA 95112 Phone: (408) 292-2214 Fax: (408) 292-2733
www.etorque.com
Trouble Shooting
5. Screwdriver RPM
The rotation speed of the screwdriver is not same as the selected one. Test the voltage between pin #1 and 5. If the reading is not same 20
/30/ 38V as the set position EF with Low/ K with Low/ K with High, check and replace the voltage selector switch (slide switch). The
High/Low switch should be also checked.
6. Screwdriver keeps running when power is on
6-1. Problem is with the screwdriver side.
6-2. Check and replace the FET Q33
7. Screwdriver does not stop at the target torque immediately and it rachets several times before stopping.
The Q31 must be damaged. Check and replace Q31 component.
8. Power shut down. Continuous fuse blown
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