Log in
Register
Menu
Log in
Register
Home
What's new
Latest activity
Authors
Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Current visitors
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Satellite TV receivers & systems support forums
Analogue systems
Echostar LT8700
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Llew" data-source="post: 643188" data-attributes="member: 175007"><p>Hi again. There are definitely major differences between the two models in the way data are passed between the CPU and display.</p><p></p><p>I have a Z80 cpu and a gate array (HTS157512). The latter handles all the in/out info to/from the display circuitry, using only one serial data line to a multiplexing chip on the display board for the alphanumeric LEDS.</p><p></p><p>Unless you also have the gate array chip, it seems like your CPU does all the signal processing for the display.</p><p></p><p>All the other pins on the connector between the mainboard and display board on mine go to the front panel buttons (mode etc.), IR receiver, and +5V power.</p><p></p><p>Doesn't look as if I am going to be of much help, other than confirming that the correct voltages are being output from the SMPS (I'm sure they must still be using the same one).</p><p></p><p>On mine (J3) I have -</p><p></p><p>Pin 1 +5V</p><p>Pin 2 -12V</p><p>Pin 3 Ground</p><p>Pin 4 +12V</p><p>Pin 5 +5V</p><p>Pin 6 -5V</p><p>Pin 7 +25V</p><p></p><p>Llew</p></blockquote><p></p>
[QUOTE="Llew, post: 643188, member: 175007"] Hi again. There are definitely major differences between the two models in the way data are passed between the CPU and display. I have a Z80 cpu and a gate array (HTS157512). The latter handles all the in/out info to/from the display circuitry, using only one serial data line to a multiplexing chip on the display board for the alphanumeric LEDS. Unless you also have the gate array chip, it seems like your CPU does all the signal processing for the display. All the other pins on the connector between the mainboard and display board on mine go to the front panel buttons (mode etc.), IR receiver, and +5V power. Doesn't look as if I am going to be of much help, other than confirming that the correct voltages are being output from the SMPS (I'm sure they must still be using the same one). On mine (J3) I have - Pin 1 +5V Pin 2 -12V Pin 3 Ground Pin 4 +12V Pin 5 +5V Pin 6 -5V Pin 7 +25V Llew [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Satellite TV receivers & systems support forums
Analogue systems
Echostar LT8700
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top