Question about JVC BR-DV600U Mini DV VCR
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Posted on Jan 02, 2017
time code problems may be the result of tape path alignment, but since you have the same problem with five decks, don't overlook the possibility that the tapes themselves may have defective or non-existent time code. check to make sure the device that recorded the time code isn't malfunctioning.
Posted on Feb 18, 2008
If the problem only shows with Mini DV tapes, it can be a tape guide issue or a mchanism loading problem where the tape is not being properly "seated" into the tape mechanism. You will need to use an oscilloscope to look at the RF waveform coming off the tape to try and figure out where your problem is.
Posted on Nov 08, 2008
There exist a number of methods for dealing with FireWire device interference, a few of which are explored here. Switching Ports The first procedure you should try when experiencing a problem that you believe to be caused by device interference is to simply reconfigure the arrangement in which your FireWire peripherals are connected. Try switching each device to a different port, or temporarily disconnecting one or more of the devices. In particular, if you are a PowerMac G5 owner, trying switching devices from the front to back ports or vice versa. Adding an external hub In some cases, it appears that FireWire devices are not drawing enough power from the computer. This can cause a sundry of strange issues, including apparent conflicts between devices and unexpected power-offs during device operation. In these instances, adding an externally powered FireWire hub can clear things up. One of the reasons an "under-powered" situation can occur is that different Mac models have varying power capacities available through their FireWire ports. PowerBooks and iBooks have the least, generating around 7 watts. The iMac G5 also generates a relatively low amount of FireWire power, sharing 8 watts between its two FireWire 400 ports. The Power Mac G5 shares 15 watts between its one FireWire 800 port and two FireWire 400 ports. Place devices on different FireWire busses/Isolate the iSight Similar to the above procedure, adding another FireWire bridge -- via an extra PCI-based FireWire adapter or another means -- can eliminate conflicts from devices that reside on the same bridge. Power cycling the system Simply cycling the power on your system may be enough to temporarily eliminate a few FireWire conflict issues. Shut down your Mac, and disconnect all FireWire devices as well as the computer's power cord. Leave the system off for about 10 minutes, then plug it back in. First turn your Mac back on, then re-attach the FireWire devices one at a time and check for the conflict to resurface. Disconnect specific FireWire devices (especially iSight) to check for conflicts As noted above, the most common cause of interference is Apple's own iSight. In case after case, simply disconnecting this single device has eliminated problems with other FireWire devices. Other devices often implicated in FireWire conflicts include video-related devices; cameras, the EyeTV, video decks, etc.
Disconnecting the iSight has proved particularly successful for an issue where the iPod disappears from the Desktop and from the iTunes playlist, while the iPod status screen cycles from the Apple logo to a "Do not Disconnect" message over and over. The exact reasons why the iSight causes more than its fair share conflicts with other FireWire devices are many, and sometimes unclear. One potential source of conflict, however, could be the unit's high bandwidth usage. The iSight captures video at a 640 x 480 pixel resolution, at 30 frames per second in millions of colors. Such throughput uses a significant chunk of the standard FireWire port's 400 Mbps bandwidth. As such, when other devices are connected, the bandwidth requirements for satisfactory performance may not be met. Try disconnecting all FireWire devices, then adding them back one by one and repeating the originally failed operation to check for conflicts. Apply the latest updates Make sure that your FireWire drives are using the latest firmware (check the manufacturers' Web site) and the most recent iPod update has also been applied. Of higher importance, if you have an iSight, is the iSight 1.0.2 updater. In a large number of cases it has resolved conflicts caused by the camera. Re-apply the most recent Mac OS X combo updater In some cases, re-applying the most recent combo updater can resurrect seemingly defunct FireWire ports and allow devices -- drives included -- to be recognized again. The most recent combo updater is available from Apple's download page. Clear caches Try using a tool like Tiger Cache Cleaner or Cocktail to remove potentially corrupt system caches. Restart, then check if your FireWire devices are recognized.
Posted on Feb 05, 2010
Please find your service manual above.
From experience I would suspect the "Mode Switch" assembly. This is the usually problem with this machine. But, also, you may have a problem with your condensation sensor, however. This and the mode switch, may be an interconnected fault.
These units are so complex and delicate that they MUST be serviced by a competent and skilled Engineer.
It is my professional recommendation, that you Contact JVC, and inquire as to a location of an Authorised servicing center. Now when there, ask them for a 'Quote" before allowing repairs to proceed. This then will allow you to make an informed decision as to the repair and it's costings.
Posted on Aug 25, 2010
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