CAUTION:
Maintain original spacing between the replaced component and
adjacent components and the circuit board to prevent excessive component
temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds
foil to the circuit board causing the foil to separate from or “lift-off” the board. The following guidelines
and procedures should be followed whenever this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the following procedure to
install a jumper wire on the copper pattern side of the circuit board.(Use this
technique only on IC connections).
1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only
as much copper as absolutely necessary).
2. Carefully scratch away the solder resist and acrylic coating (if used) from the end
of the remaining copper pattern.
3. Bend a small “U” in one end of a small gauge jumper wire and carefully crimp it
around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper pattern and let it
overlap the previously scraped end of the good copper pattern. Solder the
overlapped area and clip off any excess jumper wire.
At other connections
Use the following technique to repair the defective copper pattern at connections
other than IC Pins. This technique involves the installation of a jumper wire on the
component 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 not
exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern break and locate
the nearest component that is directly connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the nearest component
on one side of the pattern break to the lead of the nearest component on the
other side.
Carefully crimp and solder the connections.
CAUTION:
Be sure the insulated jumper wire is dressed so that it does not touch
components or sharp edges.
10
Summary of Contents for HS-2190
Page 31: ...Note the item marked have been adjusted on product line those may differ in different TV 31 ...
Page 40: ...Terminal view of transistors 2SC4237 2SD1879 2SA608 2SC536 2SB764 2SD400 40 ...
Page 43: ...C Circuit diagrams 43 ...
Page 61: ...Sincere Forever Haier Group Tel 86 532 8938356 Web site http www haier com ...
