This fix is adapted from RC4's Messsage number 26 on the thread
http://forums.digitalspy.co.uk/showt...=#post37346428
Model Number DHD4000, mind, so it might not be OK for the box you have
Symptoms
Picture breaks up and sound clicks on some channels
Cure
1 Disconnect aerial cable from back of unit
2 Press Menu Button
3 Press OK Button
4 Select scan for channels
5 Press OK Button
6 Press green button- wait for scan to complete and will see found 0
7 Press red button to cancel
8 Select Technical help
On the right hand side of menu you will a see blank screen and underneath
1: and a number will be highlighted.
9 Press left or right Button(next to OK button) to select 62 (For you, your largest preferred RF channel)
10 Press OK Button
11 Press Left button to select 61 (For you, your next largest preferred RF Channel)
12 Press OK Button
13 Press Left button to select 59 (For you, your next largest
preferred RF Channel)
14 Press OK Button
15 Press Left button to select 58 (For you, your next largest preferred RF Channel)
16 Press OK Button
17 Press Left button to select 55 (For you, your smallest preferred RF Channel)
18 Press OK Button
19 Press exit button to exit all the menus until picture appears
There may be this hidden menu on your DTI 6300 too - Source http://forums.digitalspy.co.uk/showt...ht=tuning+6021
Engineer's Menu. Menu - Setup - Help - then press 1397.
Advanced Information. Menu - Setup - Help - then press Green Button. From the advanced menu you can select -
RED. Factory Defaults
YELLOW. Software revert
BLUE. Format HDD
And if this doesn't work (I don't know if it will, but it's worth a punt!) try pulling out the RF cable, start the automatic scan and then insert the cable just before the lowest channel number of your preferred transmitter appears.
Check your instructions to make sure the box won't look for new channels and undo your hard work
To check where the correct channels are on the RF spectrum, put your postcode and house name or number into the checker on
www.digitaluk.co.uk and click on "I am in the aerial trade."
Some Freeview boxes will show a "percentage complete" as they scan, under this scheme C21 is "0%", C22 is "2%", C42 is "42%", C54 is about "66%".