If not, then you most likely have a problem with an op-amp inside the guitar electronics.
Refer to the diagram below from the Service Manual Schematics.
Hex Fuzz Resistors: Click image to enlarge.
This is a "wide" hex pickup with new wires attached.Instead of wizard101 test realm celestia a synth pickup failure, you possibly could have a problem with the electronics.If you read between two pickup output points, you should see 160 ohms.6K (depending on the version of pickup).Depending on whether you have a wide owner manual 2004 pontiac vibe or narrow pickup (see above a working pickup element should read 80 to 90 ohms for the narrow version, or 800 to 900 ohms for the wide version.Using a multimeter to test string #3 for resistance.It also doubled the number of user programs that could be stored and enabled the layering of two sounds in the right hand section.The new venture was a strategic move by Roland to enter the lucrative high-end home keyboard market which had hitherto been dominated.RA-50, Pro-E Arranger, second Generation (Produced ) E-15, E-35, E-40 OR, E-70 RA-90 Third Generation (Produced ) E-16, E-16 TR, E-36, E-56, E-66, E-86 RA-95 Fourth Generation (Produced 1995/6 1998) E-12, E-14, E-14 OR, E-14 TR-OR, E-14 US, E-28, E-280B, E-38, E-68, E-68US, E-96, G-600.The new 4558 was mounted inside a socket, for easy replacement in the future.Fortunately, I was wearing eye protection and a breather which covered most of my skin, but it was an important reminder to protection at all times.Refer to the G-303/G-808 schematic for the wiring order.A vintage Roland GR pickup consists of the divided pickup plus an attached ribbon cable.Cable failures are the most frequent GR-system problem.Here are some photos of a op-amp replacement I did on a G-303.Reading in the same direction, they are the p-touch, p-touch lock, the guitar pickup output, ground, and the normal guitar out.
To find out if you have an op-amp failure, listen to the hex-fuzz output only.I also checked the gain settings with the more sensitive GM-70, because the ladder LED display gives a much more accurate reading than one red LED on a GR-300.Version B - Click on image to enlarge.If you get all six stirngs to output a synthesizer signal, but one string looses the hex fuzz sound, then it is almost certain that you have a bad op-amp.The bottom green wire is the common lead shared by all the elements.The, roland E-20 is a keyboard instrument introduced.If you get a reading of 0 ohms, or an open circuit reading (infinite resistance then you likely have a damaged pickup.You only need to uncover one of the common pins for this repair.See the information above on measureing the impedance in your hex pickup.The video clip below shows a repair using a nylon brush.Then everything was tested again.The top pin is green (common) and the lower row is high E to low E (left to right).Well, that is some bad news!
Unless you have been moving the synth pickup around a lot, they usually do not fail on their own.
With a "wide" pickup, you should read about 800 ohms.