Cordless Soldering Gun (640-2194) Troubleshooting Faxback Doc. # 7266 Bulb lights, but tip does Check tip to be sure it is fully seated not heat up. Tip heats, but bulb does not Replace bulb. light. Tip does not heat and bulb Recharge batteries. does not light. Cannot press trigger. Be sure trigger is not locked. (br/all-8/10/94)