Sharp GX20 Service Manual - Page 51
Hands free kit Headset
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Hands free kit (Headset) When replacing the hands free kit, output available? NO Signal output at JK301 4 pin? NO Signal output at IC101 5 pin? NO Voltage of 3 V applied to IC101 6 pin? YES CONFIDENTIAL YES Hands free kit defective. GX20 YES JK301 defective or defective connection. YES Parts of hands free connector JK301 4 pin to IC101 5 pin defective or connection of Relay FPC_B with CN306 and CN202 defective. Jumper (TP214 to IC209 4 pin) defective. YES NO 3 V output at IC209 4 pin? 3 V output at IC209 1 pin? NO IC209 defective. NO YES IC104 defective. Voltage of 3 V applied to IC101 1 pin? YES Signal output at IC102 63 pin? NO Is the voltage of 0 V applied to IC102 6 pin? NO Hands free connector JK301 or R184 defective. NO IC104 defective. YES Parts of IC102 63 pin to IC101 4 pin defective or IC101 defec- tive. YES IC102 defective or soldering around C186 and R184 defec- tive. 2 - 45