Upon power-up, the cylinder does not spin on my Panasonic AG-MD830E S-VHS VCR. Although it loads (actually half-loads) the cassette properly, any transport command fails following the full-load because the cylinder is not spinning. The display reads error E-4, which means "malfunction in cylinder section." Without a service manual, I don't know where to start to debug the problem. Any help will be much appreciated...thanks!
--
--------------------------------------------------------------
Home Page: http://www.seanet.com/~jasonrnorth
JR, Very helpful as usual. Because you have pointed to the cylinder motor (or its driver), does that imply that the capstan motor/drivers are off the hook? One other piece of possibly relevant information, upon EJECT the cassette is ejected, but there is no take-up of the tape. Thanks again.
Another piece of information: disconnecting the mulitpin connector that plugs into the board for the cylinder has no effect. To me, this seems to suggest that IC1 (the driver chip?) is where the problem is located. Of course, a service manual would be very helpful.
BTW, does anyone know the part number of IC1 in this machine? I think it may be BA6149LS, but it has a heat sink obscuring the chip. If anyone has a service manual, I could sure use the schematic of the SYSCON servo board.
I have removed the heat sinks from IC1 and IC2 on the SYSCON servo board. IC1 is the cylinder driver chip (AN3815K), and IC2 is the capstan motor drive chip (BA6435S). Because neither the cylinder nor the capstan move, it is difficult to know whether there is a problem with one chip, both chips, or neither chip (if the problem is upstream of both chips). I think this is as far as I am going to get without a service manual, so any more thoughts (JR?) would be welcomed.
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.