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Strange fault on BBC programmes with Humax 9300


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Old 26-09-2016, 08:52
bill7437
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I have two Humax 9300 machines. Recently one of these has exhibited sound and
picture drop out only on BBC recordings. I thought that this could be the HDD and
replaced it but it made no difference. I then wondered if it may be due to poor signal
strength and exchanged it for the other machine in another room. Again no
difference and the problem still appears. Could this be some kind of internal tuner failure but just on BBC channels or is there any other way of solving the problem
without replacement of the machine?? Any help would be gratefully appreciated..
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Old 26-09-2016, 09:02
anthony david
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Check the signal strength using its built in metering against the same channels on the other Humax using the same aerial outlet and cable. If signal levels are low due to an aerial problem it is probable that one unit will fail, starting with the weakest channels, before the other, check all the other multiplexes at the same time. No point in anyone speculating until you have done that.
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Old 26-09-2016, 10:29
Martin Liddle
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I have two Humax 9300 machines. Recently one of these has exhibited sound and
picture drop out only on BBC recordings.
Could you describe the 'Picture drop out"? Is it all BBC recordings that are affected or only certain programs? There is a known fault on the 9150/9300 that affects recordings encoded in a particular way for transmission that causes poor play back usually described as skipping; if it is this fault there is, as far as I know, no known fix,
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Old 26-09-2016, 10:53
bill7437
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Thanks Martin for your reply. This fault has been present for a few months but
there have been no changes as far as I know with transmitters. It only appears with BBC programmes and consists of momentary sound drop out and some picture
break up with flashing lines, some times picture freezes. The fault appears with
both room aerial setups but my other 9300 works perfectly on either aerial. Is this
easy to repair if a tuner fault or is it a case of taking out the 500 GB hard drive which
seems to be OK as it records other programmes without fault, scrapping the machine and getting a used one from ebay. Any advice would be appreciated
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Old 26-09-2016, 11:05
technologist
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Check that there is no hdmi or other leads close to the aerial coax ......
Lightly screened hdmi radiate into the coax quite well if close enough and are very frequency selective,
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Old 26-09-2016, 12:13
Martin Liddle
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It only appears with BBC programmes and consists of momentary sound drop out and some picture
break up with flashing lines, some times picture freezes.
Does this occur on all BBC programs or just certain series of programs?
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Old 26-09-2016, 13:49
bill7437
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It seems to appear on all recordings of BBC programmes being BBC1, BBC2, BBC 4
does not happen with ITV, Channel 4, Channel 5 or other minority channels.
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Old 26-09-2016, 15:19
Martin Liddle
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It seems to appear on all recordings of BBC programmes being BBC1, BBC2, BBC 4
does not happen with ITV, Channel 4, Channel 5 or other minority channels.
And does it also appear when watching live BBC TV via the Humax? This sounds to me as if it could be an aerial cabling issue. Check all the aerial cabling including any fly leads for badly made joints, kinks or any evidence of water ingress. Also as somebody has said if using the HDMI output (rather than SCART) then check that the HDMI cable is as far away as possible from the aerial cable.
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Old 26-09-2016, 15:51
bill7437
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Yes Martin it does occur when watching live tv through the Humax loop through
but not when watching when Humax switched off. The same happened when this was connected to our other room aerial setup which is now feeding our second 9300
without problem no cabling having been changed. I have checked all cables and
coax plugs and still feel it is a tuner problem. If this is so is it repairable or better
to replace. I had thought of a machine from ebay and removing the 500 GB
HDD from the problem machine to use as a spare as repair costs if indeed
one can find a repairer could be excessive.
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Old 26-09-2016, 15:53
bill7437
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PS Martin, do not use HDMI only Scart.
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Old 26-09-2016, 16:04
chrisjr
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Yes Martin it does occur when watching live tv through the Humax loop through
but not when watching when Humax switched off. The same happened when this was connected to our other room aerial setup which is now feeding our second 9300
without problem no cabling having been changed. I have checked all cables and
coax plugs and still feel it is a tuner problem. If this is so is it repairable or better
to replace. I had thought of a machine from ebay and removing the 500 GB
HDD from the problem machine to use as a spare as repair costs if indeed
one can find a repairer could be excessive.
Can you just clarify what you mean in that first sentence?

Do you mean you are watching, say, BBC 1 with the Humax switched on and the TV source set to the SCART input the Humax is plugged into. Or that you have selected BBC 1 on the TV independently of the Humax?

Only the former involves the Humax tuner so only that will tell you if it is affecting only the Humax. If the TV's tuner is similarly affected then the problem is possibly external to the Humax.
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Old 26-09-2016, 17:07
bill7437
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Hi Chris, Problem only occurs when using Humax either on recordings or on
live television loop through, it does not occur when watching live television
purely through the set without the use of the Humax.
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Old 26-09-2016, 17:14
chrisjr
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Hi Chris, Problem only occurs when using Humax either on recordings or on
live television loop through, it does not occur when watching live television
purely through the set without the use of the Humax.
What you mean then is watching via the SCART input on the TV. Loopthrough normally refers to the RF IN and RF OUT sockets on the back of the Humax and hence to using the TV's own tuner independently of the Humax.

Depending on the fault it may not be repairable. Or not at a reasonable cost compared to the value of the Humax.
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Old 26-09-2016, 17:46
Martin Liddle
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I have checked all cables and
coax plugs and still feel it is a tuner problem. If this is so is it repairable or better
to replace.
Tune to a problem channel press Menu>System>Signal detection. Tell us everything on the screen.
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Old 27-09-2016, 07:50
bill7437
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Hi Martin, Channel 43 BBC1 West Midlands, Strength 80% Quality 100%
Hope this helps
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Old 27-09-2016, 07:54
bill7437
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Hi Chris, just to confirm the problem DOES not exist when using the TV set internal tuner, only when Humax is involved. Hope this helps.
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Old 27-09-2016, 10:13
chrisjr
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Hi Chris, just to confirm the problem DOES not exist when using the TV set internal tuner, only when Humax is involved. Hope this helps.
That does suggest it is a Humax fault. Whether it is repairable or not and if so at an economic cost is another matter.
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