Haier HT-3768 Service Manual

Also see for HT-3768: Owner's manual Owner's manual Owner's manual Owner's manual Owner's manual

Contents

Haier HT-3768 Service Manual Manual pdf 10 page image

whenever this condition is encountered.At IC ConnectionsTo repair a defective copper pattern at IC connections use the following procedure toinstall a jumper wire on the copper pattern side of the circuit board. (Use thistechnique only on IC connections).1. Carefully remove the damaged copper pattern with a sharp knife. (Remove onlyas much copper as absolutely necessary).2. Carefully scratch away the solder resist and acrylic coating (if used) from the endof the remaining copper pattern.3. Bend a small “U” in one end of a small gauge jumper wire and carefully crimp itaround the IC pin. Solder the IC connection.4. Route the jumper wire along the path of the out-away copper pattern and let itoverlap the previously scraped end of the good copper pattern. Solder theoverlapped area and clip off any excess jumper wire.At other connectionsUse the following technique to repair the defective copper pattern at connectionsother than IC Pins. This technique involves the installation of a jumper wire on thecomponent side of the circuit board.1. Remove the defective copper pattern with a sharp knife.Remove at least 1/4 inch of copper, to insure that a hazardous condition will notexist if the jumper wire opens.2. Trace along the copper pattern from both sides of the pattern break and locate thenearest component that is directly connected to the affected copper pattern.3. Connect insulated 20-gauge jumper wire from the lead of the nearest componenton one side of the pattern break to the lead of the nearest component on the otherside.Carefully crimp and solder the connections.CAUTION: Be sure the insulated jumper wire is dressed so that it does not touchcomponents or sharp edges.III. FUNCTIONS & LOCATION OF CONTROLSz ALL-BAND CATV (470MHz)10