Sharp GX20 Service Manual - Page 52

GX20 Hands free car kit CONFIDENTIAL When replacing the hands free car kit, output available? YES Hands free car kit defective. NO Calling available in the hands free kit mode? YES YES Incoming/outgoing call available with hands free car kit? NO Does Charge LED light up when connecting hands free car kit? YES NO Refer to "Hands free kit" in Troubleshooting "Incoming audio cannot be heard" (see page 2-45). Refer to Troubleshooting, "Charging impossible" (see page 2-49). YES NO More than 5 V applied to CN302 8 pin? NO Hands free car kit defective, or CN302 defective. Voltage of 0 V applied to CN302 12 pin when connecting hands free car kit? YES Voltage of 3 V applied to TP109 regardless of connction to hands free car kit? YES Hands free car kit defective. NO Hands free car kit defective. Or defective parts of IC302 12 pin to IC104 20 pin and IC104 defective. NO R104 or IC104 defective. Voltage of 0 V applied to CN302 10 pin during a call? YES Signal output at CN302 4 pin during a call? NO Defective parts of CN302 10 pin to IC104 125 pin or IC104 defective. YES Hands free car kit defective. NO CN302, L318, R308, V311, jumper (R308 to JK301 6 pin) or JK301 defective. 3. Audio cannot be sent/recorded. Phone Voltage of 0.8 to 1.8 V applied to TP324? NO Voltage of 0.8 to 1.8 V applied to R112 (C129 side)? NO Voltage of more than 2.4 V applied to Q101 3 pin? NO Voltage of 3 V applied to Q101 2 pin? YES B (To page 2-47) YES Parts of C129 to L314 defective. YES Parts of Q101 3 pin to C129 defective. YES Q101 defective. NO IC104 defective. D (From page 2-47) 2 - 46