What would cause a 90% loss of volume in a roland gr-1

There is probably both a global volume and individual program violume as well. One or both may have reset to a lower level and need to be turned up. It's also possible that the general output has a setting for line level or instrument level, which may be software controlled. Take a look through your manual to find these settings and adjust to suit.If all else fails, contact Roland Customer Service at this link for help.
Roland Company Contact Us Contact Us

change your speaker

If you want help from Roland you will have to register:http://www.rolandus.com/backstage/login.php That will get you access to full support and their email address. I think you are having problems with your GK-3 pickup. Make sure your string that you are having problems with is the optimal height etc. The adjustment for the GR-20 is in the manual at this link:http://www.roland.co.uk/assets/media/pdf/GR_20_Q_A.pdf Make sure your pickup is installed correctly and adjusted properly first. The manual is here:http://lib.roland.co.jp/support/en/manuals/res/1811530/GK-3_e11.pdf If you have everything adjusted and only one string is not working then I would guess you have a cable problem and the best thing is to contact Roland for advice. I didn't walk you through the adjustment because every installation for every guitar is different. Hope this helps.

While in the record mode, try pressing the menu button (volume) to get to the SYSTEM MENU. Then in the "To System Menu or Next" columns roll down until you find the record mode and press the button to change the mode.

image sensor problem, not to worry though!!!
JVC has received reports that in certain circumstances, the following models may, while in the camera mode, show no picture, a distorted picture and/or display “LENS CAP” even though the lens cap is removed. We have identified the probable cause as a failure of the CCD image sensor. Repairs of units exhibiting these problems as a result of a defect in the CCD image sensor will be made free of charge at a JVC Authorised Service Centre even if the unit is outside warranty.
Please call our Consumer Support Department on 0870-330-5000 to obtain your free repair. We apologise for any inconvenience and we appreciate your understanding and support.
Please note that this offer expires on 31st December 2008 and is applicable only to failure of the CCD image sensor.
This information applies to the following models:
GR-D18, GR-D20, GR-D21, GR-D22, GR-D225, GR-D23, GR-D24, GR-D30, GR-D31, GR-D32, GR-D33, GR-D34, GR-D40, GR-D43, GR-D50, GR-D53, GR-D54, GR-D60, GR-D63, GR-D70, GR-D73, GR-DX25, GR-DX27, GR-DX28, GR-DX35, GR-DX36, GR-DX37, GR-DX45, GR-DX47, GR-DX48, GR-DX55, GR-DX57, GR-DX67, GR-DX75, GR-DX77, GR-DX78, GR-DX95, GR-DX97, GR-FX15, GR-FX16, GR-FXM39, GR-FXM393, GR-FXM40, GR-FXM404, GR-PD1, GR-SX19, GR-SX25, GR-SX26, GR-SXM29, GR-SXM30, GR-SXM49, GR-SXM50, JY-HD10.

It looks like the offer for the fix has been extended. See here:

http://www.jvc.co.uk/template.php?page=100102

CCD Failure/Lens Cap Warning Error
JVC has received reports that in certain circumstances, the following models may, while in the camera mode, show no picture, a distorted picture and/or display “LENS CAP” even though the lens cap is removed. We have identified the probable cause as a failure of the CCD image sensor. Repairs of units exhibiting these problems as a result of a defect in the CCD image sensor will be made free of charge at a JVC Authorised Service Centre even if the unit is outside warranty. Please call our Consumer Support Department on 0870-330-5000 to obtain your free repair. We apologise for any inconvenience and we appreciate your understanding and support.
Please note that this offer expires on 30th June 2008 and is applicable only to failure of the CCD image sensor.This information applies to the following models:
GR-D18, GR-D20, GR-D21, GR-D22, GR-D225, GR-D23, GR-D24, GR-D30, GR-D31, GR-D32, GR-D33, GR-D34, GR-D40, GR-D43, GR-D50, GR-D53, GR-D54, GR-D60, GR-D63, GR-D70, GR-D73, GR-DX25, GR-DX27, GR-DX28, GR-DX35, GR-DX36, GR-DX37, GR-DX45, GR-DX47, GR-DX48, GR-DX55, GR-DX57, GR-DX67, GR-DX75, GR-DX77, GR-DX78, GR-DX95, GR-DX97, GR-FX15, GR-FX16, GR-FXM39, GR-FXM393, GR-FXM40, GR-FXM404, GR-PD1, GR-SX19, GR-SX25, GR-SX26, GR-SXM29, GR-SXM30, GR-SXM49, GR-SXM50, JY-HD10.

CCD Failure/Lens Cap Warning Error
JVC has received reports that in certain circumstances, the following models may, while in the camera mode, show no picture, a distorted picture and/or display “LENS CAP” even though the lens cap is removed. We have identified the probable cause as a failure of the CCD image sensor. Repairs of units exhibiting these problems as a result of a defect in the CCD image sensor will be made free of charge at a JVC Authorised Service Centre even if the unit is outside warranty.

Please call our Consumer Support Department on 0870-330-5000 to obtain your free repair. We apologise for any inconvenience and we appreciate your understanding and support.

Please note that this offer expires on 30th June 2008 and is applicable only to failure of the CCD image sensor.

This information applies to the following models:

GR-D18, GR-D20, GR-D21, GR-D22, GR-D225, GR-D23, GR-D24, GR-D30, GR-D31, GR-D32, GR-D33, GR-D34, GR-D40, GR-D43, GR-D50, GR-D53, GR-D54, GR-D60, GR-D63, GR-D70, GR-D73, GR-DX25, GR-DX27, GR-DX28, GR-DX35, GR-DX36, GR-DX37, GR-DX45, GR-DX47, GR-DX48, GR-DX55, GR-DX57, GR-DX67, GR-DX75, GR-DX77, GR-DX78, GR-DX95, GR-DX97, GR-FX15, GR-FX16, GR-FXM39, GR-FXM393, GR-FXM40, GR-FXM404, GR-PD1, GR-SX19, GR-SX25, GR-SX26, GR-SXM29, GR-SXM30, GR-SXM49, GR-SXM50, JY-HD10.

i need installer to download my video to cumputer

Usually when the recording is started it takes around 10 to 15 seconds for the camera to recognise and display the duration of remaining tape, if you feel there is a problem, try using different brand tape.