ROM Installation Instructions
ROM in a JamMan or other product can be a tricky but can usually be done by most musicians.
- You want to be careful about static electricity when replacing the ROM especially if the air is dry. Discharge yourself to something connected to earth ground; computer chassis, radiator, etc.. If you move around, discharge yourself again since that is what usually creates the charge.
- Set up a clean work aria. Avoid carpets (static electricity and it's also easy to lose screws). Get a cup to hold the screws so you don't lose them. Make sure you have good light.
- Disconnect all cables.
- Remove the cover. There are 4 screws the connect the cover to the rack ears, a screw in middle on the top and bottom and a screw in the back. You also need to remove the nuts that secure the audio jacks. See the notes below if you have problems with the screws. Since the screws are small, the screw drivers are small as well so you may have trouble gripping the driver. Try wrapping a cloth around the driver to get a better grip. Also be sure to keep the driver straight and press down when turning it.
- Remove the old ROM: Turn the JamMan over. The ROM is on the left rear of the board and has a label on it. Slide a small straight edged screwdriver under the chip from the back and rock up and down to pull the ROM out of the socket.
- Install the new ROM in the socket. Be sure to put the end of the ROM with the notch towards the back of the JamMan. Start by putting the pins on one side of the ROM in the top of the socket (don't press it in yet), then apply pressure on that side so that the pins on the other side slip into the top of the socket. Check to make sure all the pins are in the top of the socket and straight, then press the ROM straight into the socket.
- Plug the power supply into the JamMan (making sure there is no metal touching the board) and confirm that the display lights up and displays the appropriate message (ROM specific). If not, check for bent pins or incorrect configuration of the ROM (backwards, etc..).
- Reinstall the cover.
Problems With Screws
The JamMen were built with these funky straight edge/star screws that have historically given people problems. Most people have straight edged screw drivers so that is probably going to be what you try first. You want to use one that is a good fit so you don't risk damaging the screw heads (Craftsman 41421 1/8 drive, etc..). If you don't have the right screw driver, bring your JamMan to your local hardware store and ask someone to help you find the right driver. If you have the option, get the star driver as it makes the best connection to the screw.
Occasionally, one or more of the screws gets stripped and will not come out even if you're using the correct screw driver. There are several ways to get the screws out in this situation:
- Get a second straight edged screw driver and slip it under the head of the screw applying upward pressure while you unscrew with the first driver. Normally you are pressing down on a screw driver to get a solid connection which can work against you when the screw gets stripped. By using the second screw driver as a wedge you can usually press into it an lift at the same time.
- If the screw head is stripped along with the threads, a good technique for removing the screw is to use "Vice Grips". These are essentially locking pliers and are great tools to have around. They're also great for holding 1/4" phone jacks still while you rewire them. There are some available that have a pointed tip that can really help since the JamMan screws are recessed. Needle nose pliers will sometimes work as well but the locking ones are best. Again, bring the JamMan to the hardware store and explain your problem. They love this kind of thing. While your at the hardware store buy some new screws.
- As a last resort, you may have to drill the screws out. Definitely use this as a last resort as you can really damage the system if you're not careful. Get a drill bit that is smaller than the shaft of the screw (probably a 1/16") so that you minimize the damage to the threads. Drill straight into the screw head. Once you've drilled through the screw, use vise grips and/or needle nose pliers to pull out the screw. Be especially careful with the middle screws as they are very close to the board which can be damage (creating a whole new set of problems.). Also be VERY careful not to let flakes of metal fall on the board. Loose metal on the board can effectively rewire the circuits in some very bad ways. If some metal flakes fall on the board, make sure you get them out (blow on them, etc..).