ET-470 (430-0571) Troubleshooting Faxback Doc. # 17182 Q: Does not respond to base other than sounding three beeps. A: Remove AC from base for more than 30 seconds. Disconnect battery from handset and return handset to base with battery disconnected. Then reconnect battery in handset and AC to base. Wait for about 30 seconds and lift handset. If unit still fails to operate, send it to service.