Return to SatCure index page
Service Mode Functions
Enter Service Mode by pressing in quick succession:
While the receiver is in Service Mode you can press the Set up button repeatedly to get:
dr Download mode
p1 LNB power ON; p0 LNB power OFF
t1 TV SW. ON; t0 TV SW. OFF
Make changes with the Step buttons then press Store to save.
After finalising changes, enter Service Mode again and enable Store Protection.
The PIN number is also displayed in the service menu so you can change it if you forget it.
1. Channels 1 to 73 and the LNB settings are STORE PROTECTED.
You must disable this protection before any changes can be saved.
Enter Service Mode by pressing:
"dr" appears on display.
Now press button "6" to enable/disable store protection.
Display shows a dash "-" when store is enabled.
Press Store to exit Service Mode.
From Standby hold CH+ button on receiver and ON/OFF button (together)
1A = 9.750 GHz
2A = 10.000 GHz
4A = 10.600 GHz
Settings of 9A to 19A provide an offset of 9.745 to 9.755 GHz.
SET UP Button
1 (42) Channel number
2 (F-) Fine tune this channel
3 (.3) Audio setting
4 (PU) or (PH) H/V polarisation
5 (LA) LNB setting
6 (AH) Video level
7 (Eo) 22KHz switching
> >I was wondering if you could help me. I want to disable the
> >videocrypt decoder in my Nokia SAT 780 IRD ( I want to view MTV
> >Germany on Astra, formerly VH1, but I believe that they add a
> >'spoiling' signal which makes a videocrpyt decoder scramble an
> >otherwise clear PAL signal - nice of them).
Try disconnecting the 1uF capacitor next to the PTV111.
This works in some receivers but I'm not familiar with the SAT780.
Perhaps you would be so kind as to let me know if it solves your problem?
Thank you for your quick reply to my query. I found the 1uF capacitor in question, CL08, it is connected to a wire link J218. Removing the link disables the videocrypt decoder as you suggested. What I might do later is find the logic that drives the 22KHz tone and use this to drive an analogue switch or a DIL relay across the link and I can then program the receiver to disable videocrypt selectively. I'll let you know if I manage to do it.
I dug out the old 780 to see if I could put an easy answer to disabling the decoder from the handset. I cut two links, one BC547 and a 1k 1/4w resister later; you have remote decoder enable/disable. The 22khz tone is altogether disabled, and in the setup it is this option that allows you to turn the decoder on or off. It works fine for me. Tarted it up and put the thing back together-Pukka! I don't see the point of having 22kHz tone on this reciver anyway as it has less function than a desk lamp!
Also- the majority of people with this unit; use it on Astra- which has no anologue broadcasts in the high band anyway.
- Cut/remove J130 (connected to the processor and 22kHz tone generator.)
- Solder a 1k resistor into the bottom hole on J130.
- Solder a wire onto other end of 1k; this to the base of a BC547
- Cut/remove J218 (connected to 1uf cap in decoder/CL08)
- Solder emitter and collector of BC547 across J218. "Flat" side of transistor must face the front end of the board.
This was a very quick idea which works. I could spend a little more time adding a "pull low" to this circuit because deselecting sometimes give you a mixed picture. It is perfect once you have stored your settings. Changing channel is perfect.
Just a comment re. the method of receiving German MTV on a Nokia SAT780 box.
The advice on your page suggests some minor mods to the board (disconnecting a capacitor etc)
There is an easier solution which works on mine that folks might like to try first.
Press SETUP 6 times to show AH in the display.
Hit the up/down step button to change this to AL and voila - a clear picture.
Of course, your mileage may vary, but it's fine on mine.
I've now found out what the problem was (if you remember I couldn't get the channels to store) - The store-protection thing was enabled in the Service mode!.
Once I'd disabled this, it was actually quite easy to store channels.
You press Setup repeatedly to cycle through the setting options (I believe you have these listed on your website), use Step +/- to change them, then press Store, enter the preset that you want to store it on, and then press Store again). The 'fine tune' option seems to be provided as an alternative to the LNB Offset which most receivers have. I've found this more useful than an LNB offset, because you can alter it individually for each channel, rather than having to find the best compromise for all the channels when you are working with the offset which invariably ends up with some channels still having sparklies.
This receiver has no less than 32 audio modes. However, unlike with other receivers the settings of them are fixed and can't be changed. The two modes which are most useful are mode 3, the stereo mode used by most channels (I believe the frequencies are 7.02Mhz Left and 7.20Mhz right), and mode 14, the mono mode which is necessary for non-stereo channels like Eurosport, or for when you specifically need to use a mono signal instead of stereo (I believe the frequency is 7.02Mhz).
These two modes are probably all you will ever need to use if you are just watching Astra. You normally only need use the other modes if you delve into listening to radio stations through your satellite receiver, or if you are watching channels on other satellites which use different audio frequencies.
The fact that this receiver has only a 3-digit display and no OSD become severe limitations when you are tuning in channels as Nokia have had to adopt a strange and non-standard method of labelling the frequencies in order to cope with the limitations of this display. I'm familiar with receivers which list frequencies like 11.256Ghz as 1256 etc, but the numbers used on the SAT780 bear no resemblance whatsoever to actual frequences.
Instead of the normal tuning range, the frequencies have been given a number between 0 and 179. I.e. Sky One (11.318Ghz) is on frequency 25.
The SAT780 seems to be quite a well built receiver, but it is severely let down by Nokia being way too skimpy with its display. Just adding one more digit so that it could fit in standard frequency numbers would make it so much better.
This information is given in good faith, based on several years of workshop experience involving thousands of repairs. No responsibility will be accepted for any death, damage or injury caused either directly or indirectly by the use of this information. The reader should check the facts himself. It is assumed and stressed that the reader will be familiar with good, safe, electronic workshop practice and will be familiar with all tools, components and terms used. If there is any doubt about the reader's ability to carry out such work competently and safely, the work should be referred to a specialist engineer.
Copyright ©1998 SatCure
Version 1.2 updated on February 6, 2001
This file may be downloaded for private and personal use but NO part of it may be published in any form without the prior permission of the author.
THIS FAQ IS NOT APPROVED BY SKY OR BY NOKIA
End of FAQ
HOW DO I PLACE AN ORDER?
Return to SatCure index page
Send this page address - CLICK HERE - to a friend !