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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Problem with Panasonic AG-MD830E SVHS VCR
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! |
#2
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Problem with Panasonic AG-MD830E SVHS VCR
The drum should spool-up on load initiation, not power-up, whether or
not the load completes. Since the load function operates, initiation of drum spool-up is automatic, in firmware, and it's failure is not due to some switch or sensor failure. Look to the driver circuits or drum motor. JR VCR Gymnast wrote: 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 |
#3
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Problem with Panasonic AG-MD830E SVHS VCR
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. |
#4
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Problem with Panasonic AG-MD830E SVHS VCR
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. |
#5
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Problem with Panasonic AG-MD830E SVHS VCR
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. |
#6
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Problem with Panasonic AG-MD830E SVHS VCR
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. |
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