Sharp VCR Power Supply Schematic
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From: CL on 28 Nov 2007 00:38 I have a Sharp VC-A66U VCR with a dead switching power supply. I have replaced the chopper transistor and the fuse. It's no longer dead, but it does not regulate. Can anyone tell me what the output voltages should be? It uses a Zebra M67209 hybrid IC for the PWM controller. I'm looking for the datasheet on this IC as well as the schematic for the VCR or at least the power supply portion. I've not been able to find anything with Google. Can anyone point me to a schematic for this or a similar Sharp VCR? Please reply to newsgroup. TIA.
From: Eeyore on 28 Nov 2007 01:08 CL wrote: > I have a Sharp VC-A66U VCR with a dead switching power supply. I have > replaced the chopper transistor and the fuse. It's no longer dead, but > it does not regulate. Does it use an opto-isolator for the feedback ? Hint, look for one bridging the 6mm gap on the pcb between primary and secondary parts. Check that the opto's functioning and check the components driving it. Graham
From: Arfa Daily on 28 Nov 2007 05:15 > > > CL wrote: > >> I have a Sharp VC-A66U VCR with a dead switching power supply. I have >> replaced the chopper transistor and the fuse. It's no longer dead, but >> it does not regulate. > Have you tried it working into a load ? In general, it's pretty unusual for switchers to fail to regulate, especially if the original fault was primary-side. Arfa
From: b on 28 Nov 2007 08:56 On 27 nov, 22:38, CL <NOS...(a)SPAM.com> wrote: > I have a Sharp VC-A66U VCR with a dead switching power supply. I have > replaced the chopper transistor and the fuse. It's no longer dead, but > it does not > regulate. Can anyone tell me what the output voltages should be? It uses > > a Zebra M67209 hybrid IC for the PWM controller. I'm looking for the > datasheet on this IC as well as the schematic for the VCR or at least > the power supply portion. I've not been able to find anything with > Google. Can anyone point me to a schematic for this or a similar Sharp > VCR? Please reply to newsgroup. TIA. try: www.eserviceinfo.com
From: Franc Zabkar on 5 Dec 2007 16:12
On Tue, 27 Nov 2007 23:38:18 -0600, CL <NOSPAM(a)SPAM.com> put finger to keyboard and composed: >I have a Sharp VC-A66U VCR with a dead switching power supply. I have >replaced the chopper transistor and the fuse. It's no longer dead, but >it does not >regulate. Can anyone tell me what the output voltages should be? It uses > >a Zebra M67209 hybrid IC for the PWM controller. I'm looking for the >datasheet on this IC as well as the schematic for the VCR or at least >the power supply portion. I've not been able to find anything with >Google. Can anyone point me to a schematic for this or a similar Sharp >VCR? Please reply to newsgroup. TIA. It appears from the following VCR fault database that C913 (47uF/16V) may be the root cause of your problem. http://intrepid-video.com/database/sharp.htm Model Fault Remedy --------------------------------------------------------------------- VCA45U(VCH75U) Dead C913 (47/16v), Q901(2SC4273) & IC901 (M67209) VCH75U(VCH45U) Dead C913, 47/16v; Q901, 2SC4273 & IC901 M67209 FWIW, these Sharp models appear to use the same chip: VCA63 VCA36 VCA40G My parts supplier's database suggests that the M67209 is equivalent to a 95KUCH0078ZZ. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |