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Tech Head - The Technology Section
The Work Bench and Soldering Station
Schematic For Echostar AD3000ip Power Supply
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<blockquote data-quote="Llew" data-source="post: 139382" data-attributes="member: 175007"><p>Checked the D7/Q4 configuration, it's correct as it stands. It's not feeding any voltage supply circuit, all Q4 does is turn off when in standby. PCS (S/by line) turns off Q4 via Q2, Q5 and the aforementioned supply goes high (8.5V). For what reason I don't know.</p><p></p><p>Tip: If the PCB warps slightly (heat?) you can lose the chassis earthing point (top left, looking from the front - the two blue capacitors which connect to an isolated earthing strip). You can easily see if this has happened by checking the board contact point through the side of the chassis. It happened with mine, I had to insert a small piece of metal to secure a good contact. Without this earthing, these capacitors are ineffective and may cause noise on tne mains line.</p><p></p><p>Llew</p></blockquote><p></p>
[QUOTE="Llew, post: 139382, member: 175007"] Checked the D7/Q4 configuration, it's correct as it stands. It's not feeding any voltage supply circuit, all Q4 does is turn off when in standby. PCS (S/by line) turns off Q4 via Q2, Q5 and the aforementioned supply goes high (8.5V). For what reason I don't know. Tip: If the PCB warps slightly (heat?) you can lose the chassis earthing point (top left, looking from the front - the two blue capacitors which connect to an isolated earthing strip). You can easily see if this has happened by checking the board contact point through the side of the chassis. It happened with mine, I had to insert a small piece of metal to secure a good contact. Without this earthing, these capacitors are ineffective and may cause noise on tne mains line. Llew [/QUOTE]
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Miscellaneous Sections
Tech Head - The Technology Section
The Work Bench and Soldering Station
Schematic For Echostar AD3000ip Power Supply
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