Power Problems And Solutions; Troubleshooting - Kurzweil K2600 Musician’s Reference

Power Problems and Solutions

The K2600 is quite tolerant of voltage ßuctuations, noise, and transients in the AC power it
receives. The input line Þlter and grounded power cable will protect against even large amounts
of noise from motors and the like while the built-in Þlter coupled with the fuse will protect
against all but the largest transients. If your installation is actually suffering from line noise or
transients, most likely your other equipment will be suffering more than your K2600.
Very low line voltage or severe voltage dips are a problem for any computer-based instrument.
When the K2600 is set for 120 volt input (the normal North American setting), it should function
down to 90 volts. If the line voltage drops below 90 volts, a special circuit halts all activity to
protect against software crashes or damage. When the line voltage returns to and stays at an
acceptable level for at least one second, the computer will automatically restart. The net effect is
just as if you had performed a soft reset. Continuous low line voltage or transient dips will never
produce symptoms other than unexpected soft resets as just described. Any other problems such
as distortion, disk errors, or lost data are caused by something other than line voltage
ßuctuations.
Soft resets from line voltage dips are most common. These are easily identiÞed because the reset
occurs coincident with the building lights dimming, stage lights or power amps being switched
on, or air-conditioning equipment starting up. The solution in all cases is to get a more direct
connection between your K2600 (and any other computer-based equipment) and the buildingÕs
power. Floodlights, large power ampliÞers, and motor-operated devices should use a separate
extension cord; preferably they should be plugged into a separate circuit.
Chronic low line voltage is best conÞrmed by measurement. Readings below 100-105 volts mean
that even small dips could cause resets, while readings below 95 volts (accounting for meter
inaccuracies) are a deÞnite problem. Again, the best solution is to separate your heavy lighting
and ampliÞer loads from your K2600 and other synths on separate extension cords or separate
circuits when possible. If the actual building voltage is that low, we recommend using an
external step-up transformer or voltage regulator. We do not recommend changing the line
voltage selector to 100 volts (or 220 volts in Europe) because overheating or blown fuses may
occur if you leave the K2600 at the lower setting and use it later at a normal voltage level.

Troubleshooting

Naturally, weÕve done everything possible to ensure that your K2600 arrives free of defects. And
thereÕs a good chance that thereÕs nothing wrong, even if youÕre not seeing the proper display or
hearing the sounds. Carefully check the following things:
Make sure that your power supply is at the right voltage, and is functioning properly.
Make sure the power cable is connected properly.
Adjust the display contrast if necessary (on keyboard models, thereÕs a knob on the rear panel;
on rack models, the knob is on the front panel, above the power switch). If you still have trouble
seeing the display, itÕs time to contact your dealer.
Make sure your audio cables are fully connected to the K2600 and to your sound system. You
may want to switch your audio cables, unless youÕre sure theyÕre functioning properly.
For rack models, make sure that your MIDI connections are correct, and that your MIDI cables
are functional. You should have at least one MIDI cable, which should be connected from the
MIDI Out port of your MIDI source to the MIDI In port of the K2600.
Check that the K2600Õs Volume slider is at least partially up.
Check the volume level of your sound system.
Maintenance and Troubleshooting
Power Problems and Solutions
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