Just acquired a PM5509 to partner my PM5334.
Would anyone have a copy of the PM5509 circuit diagram and description they could scan? I know there's a manual for sale on e-bay but its more than I paid for the whole device.
Fault #1 Seemingly no RF output
Range works as when selecting 1 thru 5, the range meter indicates correctly and corresponds to the button depressed. However the frequency side seems dead, no meter movement when tuning associated varicap. Connected to a TV and tried all range and tuned across the band, nothing!
Decided to hook the scope to video output, this was more successful, I could see there was output and the waveforms were correct for each pattern. I then hooked the video output to an external modulator and connected to a TV, all patterns bar one work so video out is OK.
Patterns- Chequerboard, dot, circle, grey scale, DEM are working except one pattern, which leads to fault #2.
Fault #2 Colour bar pattern sequence is incorrect
I have various PDF's of the instructions, but no service info and I have been searching for a while.
My 5509 also had either no RF or Video out and it was the BNC socket with an internal short!
Might be worth a quick check?
To complete the story of the PM5509.
This week another turned up on e-bay and clearly showed it working, as I've not managed to fix the first one I thought I'd nab it.
So you can imagine my complete and utter dismay when it arrived today, plugging it in it produced no test patterns whatsoever.
I could see there was RF output as the TV would tune into the blank signal. It was packed perfectly, double boxed and extreme packing, so something has given up electrically since.
I thought I would run the ESR70 meter over the electrolytics. One board is very simple to get at, the other is a pain requiring two shielded leads to be unsoldered and two that need unplugging. On the board with the 4.43 crystal I found two philips blue electrolytics 1uF 63V, both had turned into resistors. I then found a further three 1uF 63V on the main board two again were high ESR the other was o/c.
All five were replaced, I eagerly powered up but to be honest was not expecting it to be as simple as that but low and behold it was now working.
The other one will now serve as spares to maintain this one should it ever need anything. So finally I have a working PM5509 to partner my PM5334, Its nice to have period kit to work on your TV's
Always good to have decent test equipment, sometimes makes life a little easier.
Nice fix Chris, it makes a change for something to be straight forward. ?
I also have a PM5509 which doesn't work correctly, I must take a look at it.
I used to have one of these! I sold it years ago when it stopped working 🙁
I remember it went to a TV collector somewhere near Kent, my dad delivered it to him since he was going that way for work. The guy who bought it messaged me later telling me it was an easy fix! A couple of duff caps which had taken out a couple of transistors too. The fault was no video, but RF was ok.
Regards,
Lloyd
There is a Philips mod to produce a full colour bar pattern.
In case anyone is interested in this mod its very simple. On the 5509 all you need to do is remove the solder link "A3" on the hinge-out panel, however for now, I prefer to keep my unit in its original factory configuration.
What is amusing is Philips released a mod for the PM5508/PM5506 to make the colour bar pattern appear like the PM5509, upper-part colour bar, lower-part white. That mod for the 5508/6 was a little more complicated, the sheet for it is in the library.
I used to borrow one of these from work when I first started renovating first generation sets for usually, Anne's friends. Certainly brings back a few memories.
I have two of the subsequent model (they were gifts) as well as the 'posh' ones.
I have far too much test equipment, I really do... if memory serves, aren't the colour bars 75% on these?
if memory serves, aren't the colour bars 75% on these?
Yes, also known as EBU Bars, as used by the ITA/IBA.
A comparison between these and 95% 'BBC Bars', plus other variants, can be found here
if memory serves, aren't the colour bars 75% on these?
Yes, also known as EBU Bars, as used by the ITA/IBA.
A comparison between these and 95% 'BBC Bars', plus other variants, can be found here
EBU bars are NOT 75% bars, Terry!
EBU bars have a 100% amplitude white bar whilst the coloured bars are 75% amplitude - 75% bars (sometimes known as SMPTE bars) have a 75% amplitude white bar, unsurprisingly. EBU bars are also used by the BBC but since the adoption of HD and UHD, 100% bars are making a return.
In this case, EBU bars are 100.0.75.0, 75% bars are 75.0.75.0 and 'BBC bars' (which were never used internally) were 100.0.100.25.
Yes, also known as EBU Bars, as used by the ITA/IBA.
A comparison between these and 95% 'BBC Bars', plus other variants, can be found here
That site appears to contain a number of errors, I'm afraid.
In the interests of Radios-TV reputation preservation and so folk here and guests looking in are aware .... The opening statement below covers everything in the Pembers archive, the statements and content within, nothing to do with Radios-TV.
Posted by: Cathovisor
EBU bars are NOT 75% bars, Terry!
No doubt you already have the complete document but for anybody else who wants it, it is here.
Interesting, because that has always been my understanding.Although the IBA didn't say, in their reference material, that the EBU Bars were 75%, they do have the same specification: only the white bar is changed to grey.Their definition of SMPTE bars also agrees with Alan Pemberton, the difference, I think, comes from the use of a black level set-upNo doubt you already have the complete document but for anybody else who wants it, it is here.
The IBA don't say that EBU bars are 75% because they are not: they have a full-amplitude white bar followed by 75% amplitude 100% saturation colour bars (and a black bar, obviously). The extract from TR2 which you published is entirely consistent with what Cathovisor wrote. There is a reason for this: it is because he is correct.
It may be worth noting that "95% bars" is something of a misnomer, since the electrical saturation is 75%. However, when viewed on a corrected-adjusted colour picture monitor, the apparent saturation is 95%, due to the gamma of the tube. However, the term "BBC bars" is also misleading because the standard BBC colour bar test signal was 100% bars, for almost all purposes. The selector on the front of BBC bars generators was marked "100%", "95%" and "EBU".
From about 1980 onwards, bars produced by BBC bars generators had a second white bar at the end of the line, to make it easier to detect the positions of the leading and trailing edges of blanking. This is useful knowledge when dealing with equipment which re-inserts syncs and burst into the composite coded signal.
100% bars are the purist's colour bar: if a system will pass 100% bars correctly then you can be absolutely confident that it will handle programme video without undue distortion. However, the chroma excursions go a long way above peak white and below black level, and, whilst studio centre equipment and the links in the contribution and distribution networks are designed to cope with this, it can cause problems for transmitters. It is also an issue if satellites are involved because, as someone has pointed out, the chroma pre-emphasis used can cause the FM signal to overdeviate.
From this point forward, the question is "what compromises do you accept in the interests of an easy life whilst still retaining the ability to make useful measurements?"
"95% bars" have chroma above peak white, though less so than 100% bars, but not below black level, EBU bars have chroma below black level, but not above peak white. The EBU used to claim that EBU bars were more representative of the voltage excursions seen in programme material, which is fine as far as it goes, but the BBC approach always used to be to test a system to its limits in order to ensure that it was trouble-free for programme service.
I've never been very clear how effective SMPTE bars were intended to be as a test signal, but the Americans used them as ident and line-up signals quite happily for donkey's years.
It's also interesting to note how the luminance derivation equation has changed due to display technology changes; for HDTV it is now Y= 0.2126 R + 0.7152 G + 0.0722 B.
