Schematic for Echostar AD3000ip LNB switching circuit

Llew

Llew

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14,710
My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
I've been poking around in the AD3000ip to check out the layout of the LNB switching supply, as I have in the past had failures of a couple transistors due to silly shorts brought on by failure to make sure the cabling from LNB to f- plug is sound (I'm always swopping and re-terminating connections).

Q904 and Q909 are in my opinion the most likely suspects to be damaged if a short in the cable occurs for any length of time.

Here's my effort at drawing the schematic. I haven't provided values for the semis, just swop like for like or use any medium power rated transistors.

Llew
 

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Burnham Beech

Specialist Contributor
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Thanks for the information. Have copied it for future reference if needed.
 
Llew

Llew

cerca trova...
Staff member
Messages
14,710
My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
Always worth trying to keep the old box working - (within its limitations, channel capacity etc). But then I only really use it for dish positioning.

Later receivers than this Echostar have a dedicated LNB switching chip that provides the H/V voltages; this one just uses basic easily available or substitute components.

I couldn't at first work out how the 12V regulator U901 was able to supply the 13/18V to the LNB, as what is normally the ground terminal fixes the output at 12V.

In this circuit this terminal is raised through Q909 to 1V or 6V, which will give 12V+1V=13V or 12V+6V=18V to the LNB.

I was thrown by the fact that the fault I had (shorted Q909) earthed the ground terminal of U901!

Llew
 
K

KONAMI

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3
My Satellite Setup
I am Cameroonians Electronics Designer Student.
My Location
Cameroon
Good Morning Can I have a complete Echostar Ad 3000 IP circuit diagram with a list of all coponents use ? I am sur that you can help Tanks.
 
Llew

Llew

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Staff member
Messages
14,710
My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
Nothing available that I'm aware of except for the power supply posted on this forum. Sorry.
 
S

Sixoence

Member
Messages
13
My Satellite Setup
Skystar2
Amstrad Digibox
Echostar AD3000
Manhattan ST550
My Location
UK
My Trusty AD3000ip refuses to pick up any channels in the upper frequency range, either H or V. Any ideas? I really don't want to junk it!
 
Lazarus

Lazarus

Tout Rond Bon Oeuf
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My Satellite Setup
80cm Motorised.
Several small Dishes.
Much else.
My Location
North York Moors
Sixoence said:
My Trusty AD3000ip refuses to pick up any channels in the upper frequency range, either H or V. Any ideas? I really don't want to junk it!
Could be either a receiver settings fault or an LNB fault: 22 KHz tone achieves band switching.

I see you have other receivers, so you should be able to prove LNB function (or otherwise!) without difficulty.
 
S

Sixoence

Member
Messages
13
My Satellite Setup
Skystar2
Amstrad Digibox
Echostar AD3000
Manhattan ST550
My Location
UK
Other receivers work fine so the LNB is OK - must be the 22khz tone - can anyone point me in the direction of what component(s) I need to replace? - I can solder but my electronics expertise is pretty much nil.
 
Llew

Llew

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Staff member
Messages
14,710
My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
The problem we have is tracing out the circuitry without a schematic of the mainboard to hand.

I can do a check with my 'scope working backwards from the plug when I get the chance, but whether I can pin any one component down that might be your problem who knows.
 
S

Sixoence

Member
Messages
13
My Satellite Setup
Skystar2
Amstrad Digibox
Echostar AD3000
Manhattan ST550
My Location
UK
Thanks Llew - trouble is I would't have a clue where to start. Just love the receiver so don't want to throw it.
 
Llew

Llew

cerca trova...
Staff member
Messages
14,710
My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
If you have a digital multimeter, you can do a quick and dirty check on whether the 22kHz signal is coming from the processor.

Switch to AC and a low scale (2V or whatever your meter has around this voltage).

Locate Q910 (just below the copper heatsink to the left of the tuner).

Place your +ve probe on the bottom pin of Q910. That's the left-hand terminal of the two pins looking 'sideways'. Your -ve probe to ground (chassis).

If you go to Menu - 6 - 1 of your box (Program Satellites) you can then easily switch between high and low band frequencies of your satellite in the TP bar for testing whether the 22kHz is switching on.

You're checking for a 22kHz square wave, which should show around 1V or more on your meter when you switch to a high band channel. Switching to a low band channel should show around zero.

As I say, it's a rough check, but it will confirm whether your processor is actually sending out the signal.

Just do another check first though to confirm that you LNB settings are definitely correct.

**Be ultra careful when checking circuitry in the box - the power supply on the left is exposed, and in particular the heatsinks in that area can deliver a mighty shock! Don't connect your -ve probe to them, only to the box's chassis**
 
S

Sixoence

Member
Messages
13
My Satellite Setup
Skystar2
Amstrad Digibox
Echostar AD3000
Manhattan ST550
My Location
UK
Hi Llew - took your advice and checked the LNB settings - strangely the LNB was set to 'type 8' and the box refused to accept 'type 1' until I did a factory reset which permitted high band tuning on a type 1 LNB. Its this a common fault??
 
Llew

Llew

cerca trova...
Staff member
Messages
14,710
My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
Never heard of that one Sixoence. One to add to the list :-rofl2

Glad you're running OK now :)
 
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