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Tech Head - The Technology Section
G-box fix....
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<blockquote data-quote="Vipersan" data-source="post: 897793" data-attributes="member: 325666"><p>I finally fixed the G-box unreliable operation ..</p><p>The electrolytic caps leaking were the prime cause of bizzare operation ..moving the dish unprompted ..and incorrect selection of diseqc position etc..</p><p>but NOT the sole problem..</p><p>For a couple of weeks after changing the 470uf ..and the 1000uf cap for good measure ..the gbox did work correctly..</p><p>errr ..more or less ..</p><p>Occasionally not coming out of standby mode when the receiver was turned on ...</p><p>and not responding first time to a channel change ..</p><p>So today I set about fixing it fully..</p><p>The 'staying asleep' problem was diagnosed to the hot glue often used in shyte construction of electrical gear these days ..</p><p>experience taught me to remove where possible this unneccesary gunk as it will brown and become conductive in hot environments ...and guess what ..</p><p>The manufacturer uses it as an extra but un-needed brace where the control pcb is connected to the motor/psu pcb ...</p><p>speading it quite liberally over pins of the risc microprocessor...</p><p>Out came the control pcb and all traces of the brown discoloured now conductive glue removed..</p><p>Once clean the control pcb ewas refitted using leaded/flux solder ..replacing the unleaded solder.</p><p>This makes for stronger more reliable joints and negates the need for glue as a brace.</p><p></p><p>OK the G box now comes on EVERY time the receiver is turned on ..</p><p>ie doesn't stay asleep in standby ...nor popping off to sleep unprompted.</p><p>But still I have an issue with selection of certain channels ...</p><p>Often the dish remained unmoved ...so diagnosed the Gbox as insensitive..</p><p>So located a coupling cap that supplies the 22khz signal to the control board ..</p><p>10nf ..and upped it by a factor of 10 to 100nf ..</p><p>Now we are cooking with gas ..</p><p>The Gbox is reliably responding to commands and moving the dish to the correct selected position ..and doesn't go to sleep unpredictably during an operation.</p><p></p><p>Here are a couple of before and after pics of the baked hot glue and a photo of the cap changed in value to 100nf..</p><p>Maybe this will be useful info to Gbox owners ..</p><p>The Gbox COULD have been a definitive product ....IF the manufacturers had not skimped on quality components and cut corners by using glue..</p><p>Perhaps why they stopped making it ????</p><p>..did it get a bad rep ? ..</p><p></p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 897793, member: 325666"] I finally fixed the G-box unreliable operation .. The electrolytic caps leaking were the prime cause of bizzare operation ..moving the dish unprompted ..and incorrect selection of diseqc position etc.. but NOT the sole problem.. For a couple of weeks after changing the 470uf ..and the 1000uf cap for good measure ..the gbox did work correctly.. errr ..more or less .. Occasionally not coming out of standby mode when the receiver was turned on ... and not responding first time to a channel change .. So today I set about fixing it fully.. The 'staying asleep' problem was diagnosed to the hot glue often used in shyte construction of electrical gear these days .. experience taught me to remove where possible this unneccesary gunk as it will brown and become conductive in hot environments ...and guess what .. The manufacturer uses it as an extra but un-needed brace where the control pcb is connected to the motor/psu pcb ... speading it quite liberally over pins of the risc microprocessor... Out came the control pcb and all traces of the brown discoloured now conductive glue removed.. Once clean the control pcb ewas refitted using leaded/flux solder ..replacing the unleaded solder. This makes for stronger more reliable joints and negates the need for glue as a brace. OK the G box now comes on EVERY time the receiver is turned on .. ie doesn't stay asleep in standby ...nor popping off to sleep unprompted. But still I have an issue with selection of certain channels ... Often the dish remained unmoved ...so diagnosed the Gbox as insensitive.. So located a coupling cap that supplies the 22khz signal to the control board .. 10nf ..and upped it by a factor of 10 to 100nf .. Now we are cooking with gas .. The Gbox is reliably responding to commands and moving the dish to the correct selected position ..and doesn't go to sleep unpredictably during an operation. Here are a couple of before and after pics of the baked hot glue and a photo of the cap changed in value to 100nf.. Maybe this will be useful info to Gbox owners .. The Gbox COULD have been a definitive product ....IF the manufacturers had not skimped on quality components and cut corners by using glue.. Perhaps why they stopped making it ???? ..did it get a bad rep ? .. rgds VS [/QUOTE]
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G-box fix....
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