HANDLING PRECAUTIONS FOR LCD MODULES
Handling LCD Modules
Our LCM have been assembled and adjusted accurately before delivery; therefore, observe the following points for handling:
(1) Do not subject it to excessive shocks by dropping it.
(2) Do not modify the tab of the metal holder nor make any arrangement to it.
(3) Do not work on the printed circuit board.
(4) Limit the soldering to the printed circuit board only to I / O terminals.
(5) Do not touch the connection rubber ( inter-connector ), nor modify its location.
Warning for Static Electricity
Our LCM uses CMOS LSI. Therefore, counter measures for static electricity is taken through all the process from manufacturing into shipping. When using, take sufficient care to prevent static electricity as in the case of a normal CMOS IC.
1. Always use a human body grounded when handing LCM.
Always apply grounding to your body while you are working with LCM from the time it is taken out of the anti-static bag until it is assembled in a set to keep the human body and LCM at the same potential.When it is necessary to transfer LCM after it is taken out of the bag, always place it in a electric conductive container. Moreover, avoid wearing clothes of chemical fiber . Cotton or conductive treated fiberclothes are recommended.
2. Use a no -leak iron for soldering LCM.
The soldering iron to be used for soldering of I/O terminals LCM, is to be insulated at the iron tip, or grounded at the iron tip.
3. Grounded electrical apparatus are always required for assembly.
Electrical apparatus required to assemble LCM in set, specially electric drivers, are to be grounded to avoid the efforts of transmitting spike noise generated when the motor is rotated.
4. Make the potential of the operation bench equal to the grounded potential.
When the bench is grounded with steel plate, there is a possibility of damaging the LCM, or in rare cases of electric shocks being generated because the impedance is too low; therefore, it is recommended to use an electric conductive ( rubber ) mat.
5. Peel off the LCM protective film slowly.
Our LCM are attached with protective film to protect the surface. However, peeling it off abruptly may cause some static electricity to be generated, so pay attention when peeling off the tape slowly.
6. Pay attention to the humidity of the work shop.
50~60% Relative Humidity is satisfactory.
Cautions for Soldering to LCM
The following shall be followed for soldering the LCM, as already explained:
*Soldering is to be applied only to the I / O terminals.
*Use a soldering iron with no leakage.
In addition to the above, pay attention to the following.
(1) Conditions for soldering I / O terminals
Temperature at iron tip: 280oC + 10oC
Soldering time: 3-4 sec. / terminal
Type of solder: Eutectic solder ( rosin flux filled )
Avoid using flux, because it may penetrate the LCM and the LCM may be contaminated when cleaning is required. Moreover, reel off the protective film after soldering of the I / O terminals is completed. In this way surface contamination caused by the dispersion of flux while soldering can be avoided.
(2) Removing the wiring
When a lead wire or a connector soldered to the I / O terminals of LEM is to be removed, remove it after the solder at the connection part has melted sufficiently because the I / O terminals is inserted though a hole.
If forcefully removed, it may cause the terminal to break or peel. It is recommended to use a suction-type solder sucker. Moreover, do not repeat wiring by soldering more than 3 times.
Excess Electric Current Protection
Excess electric current protection circuit is not equipped in LCM. Therefore, in preparing for the worst, use electric source which has excess electric current protection circuit.