Re: [Elecraft] K2 front panel LCD soldering
Conway, You may (should) leave that film in place. 73, Don W3FPR Conway Yee wrote: > Gentlemen, > Your recommendations are appreciated. I checked the IC joints VERY > carefully for cold joints and bridges. I reflowed all joints as well. > My leads are long as well. > > I have a followup question. The instructions specifically say NOT to > remove the backing on either side. My LCD backlight assembly has white > diffusers on both sides (so far so good). There is, however a SECOND > thin plastic translucent (not white) film as well on top of the assembly > which seems to be removable. Can I remove this second film? > > tnx. > Conway Yee, N2JWQ > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K2 front panel LCD soldering
KA9UCP writes: >One point they did make, be sure the IC under the LCD is checked for >proper soldering as any corrections after the LCD is installed is a >"bear". W3FPR writes: >The problem was that for a period of time, the leads on the backlight >assembly from the vendor were too short, and those backlight assemblies >with short leads must use the instructions on the errata page Gentlemen, Your recommendations are appreciated. I checked the IC joints VERY carefully for cold joints and bridges. I reflowed all joints as well. My leads are long as well. I have a followup question. The instructions specifically say NOT to remove the backing on either side. My LCD backlight assembly has white diffusers on both sides (so far so good). There is, however a SECOND thin plastic translucent (not white) film as well on top of the assembly which seems to be removable. Can I remove this second film? tnx. Conway Yee, N2JWQ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K2 front panel LCD soldering
Conrad, The support is not the only issue (although it may make the LCD backlight mounting more sturdy). The problem was that for a period of time, the leads on the backlight assembly from the vendor were too short, and those backlight assemblies with short leads must use the instructions on the errata page this situation has since been corrected with the vendor. If your backlight assembly has leads of a sufficient length to use the spacers and still allow soldering on the solder side of the board, then yes, you can ignore the errata and use the original instructions. In other words, look at the lead length you have with your K2 kit and do "what is right". The one thing that is important is to get the backlight assembly LEDs adequately soldered to the pads on the Front Panel board, and spaced up so the backlight assembly fits nicely below the LCD display module. 73, Don W3FPR Conway Yee wrote: > On page 27, right column of the current K2 construction manual, the > revised instructions tell me to place the spacers beside the LCD leads and > remove the spacers after soldering. The original instructions tell me to > place the LCD leads THROUGH the holes in the spacer. Presumably these > spacers are the LCD spacers broken from the RF probe/switch spacer at the > beginning of the construction. > > Why did they change the instructions? What is the advantage? > > Not knowing the benefits of the new instructions, it would appear that the > old instructions make more sense. The new method leaves the LCD supported > by only the leads. The spacers add support. > > tnx. > Conway Yee, N2JWQ > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.722 / Virus Database: 270.14.120/2587 - Release Date: 12/26/09 > 03:27:00 > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K2 front panel LCD soldering
On page 27, right column of the current K2 construction manual, the revised instructions tell me to place the spacers beside the LCD leads and remove the spacers after soldering. The original instructions tell me to place the LCD leads THROUGH the holes in the spacer. Presumably these spacers are the LCD spacers broken from the RF probe/switch spacer at the beginning of the construction. Why did they change the instructions? What is the advantage? Not knowing the benefits of the new instructions, it would appear that the old instructions make more sense. The new method leaves the LCD supported by only the leads. The spacers add support. tnx. Conway Yee, N2JWQ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
