Manuals for Blaupunkt TV model BT 70-26 VT, chassis FM550.20
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From: Robert Petras on 9 Jul 2008 13:41 Franc Zabkar wrote: > BTW, Grundig Australia's service rep (United Electrical Engineering > Pty Ltd) didn't want to know me. I was told that they didn't support > old CRT sets. Instead I was advised to contact Grundig directly. > > BTW, I have no idea who is the service agent for Blaupunkt TVs in > Australia. I have basically given up looking for them. You won't get lucky trying to get technical assistance from Grundig on sets that old. The former Grundig company of Fuerth, Germany has been bankrupt and the name - not the knowledge and quality of service/ design - sold some years ago. What nowadays goes by the name "Grundig" is not worth the bandwith wasted writing about it. And Blaupunkt dropped out of the TV segment almost decades ago, after all they mostly rebadged Grundig Chassis. So there is no use trying to get any info from either of them. What you have there is some fine machine from the good old days, and I am really sorry I have no info on that particular IF module, since I've never seen AUS sets. The 29504-102 PAL BG IF Module with german type 5.5/5.74MHz Subcarrier (Not NICAM) Stereo decoding based on TDA6611-2 is depicted in the CUC5510/11 schematic (DL-able on eserviceinfo). Maybe this will help some. Unfortunately this set does not have the well known washer contact at the mains switch that regularly caused audio mute problems in earlier Grundig models. So it's other problems you will have to look into. With CUC6330 you may try this: Since the IF Module is not the same as in the German models I know, get the Datasheet for TDA6612-5 from alldatasheet.com and see if you can scope something on the input of this IC the way it is coming from the U2840 - so you rule out the U2840. Try Scart AV. Generally with any of these sets scope the I2C at the TDA6612 to see if a level of 5V is reached when the SDA SCL line is being released, and the edges on the Hi-Lo Lo-Hi transitions are not too sloped. The test I used for IC like TDA66xx/6200/TY45018 etc used in Grundigs and similar sets whenever swaping the module was not an option, is to take the chip off the bus and attach a I2C monitoring/control software like IICUNI.EXE with its simple hardware interface to the chip and see if the chip does respond to the address probe command of the software. I found most of the time one of these chips are gone (mostly due to arcover from tripler/DST), they are gone for good and won't even respond to their address being called. BTW Since TDA6612 controls the volume and source selection like TDA6611, I suspect it to mute the sound unless it is initialized via I2C,- just like the TDA6611 and TY45018 etc generally do. So I wouldn't expect taking the TDA6612 off the BUS would do any good unless you init it manually via some dongle/software using the commands from the datasheet. Sadly as with most of these models the spare part plus labor is mostly beyond the limit of most customers. -regards, Robert
From: b on 9 Jul 2008 16:14 On 8 jul, 01:15, Franc Zabkar <fzab...(a)iinternode.on.net> wrote: > Does anyone have a user manual for a Blaupunkt TV model BT 70-26 VT? > > Service manual for Blaupunkt TV chassis FM550.20, or circuits for the > audio section (IF and output)? > > - Franc Zabkar > -- > Please remove one 'i' from my address when replying by email. blaupunkt chassis equivalents here: http://www.empresas.mundo-r.com/cromavideo/CHASISBLAUP.htm blaupunkt known problems here (spanish): http://www.empresas.mundo-r.com/cromavideo/TVBLAUPUNKT.htm HTH B.
From: Franc Zabkar on 10 Jul 2008 02:00
On Wed, 09 Jul 2008 17:46:17 +1000, Franc Zabkar <fzabkar(a)iinternode.on.net> put finger to keyboard and composed: >BTW, I have no idea who is the service agent for Blaupunkt TVs in >Australia. It's SAL Electronics: http://www.salelectronics.com.au/service.html BTW, the TFK IC was a U2860B, not a U2840B. Sorry. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |