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I purchased a copy of my old JVC VCR Service manual from Owner-Manuals.com
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I was able to fix my VCR - it had a bad belt.
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Good quality, the manual help me to repair the echo/reverb section
3-2 FIRMWARE RENEWAL MODE
3-2-1 How to Update the Firmware Version
1. Turn the power on and remove the disc on the tray. 2. To put the DVD player into version up mode, press [9], [8], [7], [6], and [SEARCH MODE] buttons on the remote control unit in that order. The tray will open automatically. Fig. 3-2-1 appears on the screen and Fig. 3-2-2 appears on the VFD. The DVD player can also enter the version up mode with the tray open. In this case, Fig. 3-2-1 will be shown on the screen while the tray is open.
F/W Version Up Mode Please insert a DISC for F/W Version Up.
No. 1 2 3
Appearance Reading... Erasing...
State Sending files into the memory Erasing previous version data
Programming... Writing new version data
5. After programming is finished, the tray opens automatically. Fig. 3-2-5 appears on the screen and the checksum in (*3) of Fig. 3-2-5 appears on the VFD. (Fig. 3-2-6) At this time, no buttons are available.
F/W Version Up Mode VERSION : ******** Completed SUM : 7abc (*3)
EXIT: POWER
Fig. 3-2-1 Version Up Mode Screen
Fig. 3-2-5 Completed Program Mode Screen
Fig. 3-2-2 VFD in Version Up Mode
Fig. 3-2-6 VFD upon Finishing the Programming Mode (Example)
3. Load the disc for version up. 4. The DVD player enters the F/W version up mode automatically. Fig. 3-2-3 appears on the screen and Fig. 3-2-4 appears on the VFD.
F/W Version Up Mode VERSION : Reading...(*2) ********
6. Unplug the AC cord from the AC outlet. Then plug it again. 7. To finish this mode, press [POWER] button.
3-2-2 How to Verify the Firmware Version
1. After making sure that no disc is in unit, turn the power on. 2. Press [1], [2], [3], [4], and [DISPLAY] buttons on the remote control unit in that order. The B/E version appears on the VFD, and the F/E and B/E versions appear on TV screen. 3. Turn the power off to reset the unit. Note: If the firmware has been changed, etc., we will use Service News, etc. to report on how to obtain new firmware data and create an upgraded disc.
EXIT: POWER
Fig. 3-2-3 Programming Mode Screen
Fig. 3-2-4 VFD in Programming Mode (Example)
The appearance shown in (*2) of Fig. 3-2-3 is described as follows:
3-7
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