Lexicon MPX 1 - Manual (Page 123)

Troubleshooting
10-1
10
Troubleshooting
This chapter is intended primarily to help you recognize some common error
states which can be corrected from the MPX 1 front panel, or by simple means
such as cable replacement. Any error states which are not covered here should
be referred to your local dealer or Lexicon Customer Service.
In a low-voltage, or "brown-out" condition (less than 40VAC), the MPX 1 will
freeze in its current state. None of the controls will have any effect. When power
returns to a normal level, the unit will reset itself as though it had just been
powered on. If the unit does not reset itself, turn the power OFF, then ON to
resume normal operation.
Temperature extremes may cause the MPX 1 to exhibit unpredictable behavior.
If the unit has been subjected to temperatures below 32°F (0°C) or above 95°F
(35°C), it should be turned off and allowed to return to normal temperature
before use. The unit may be damaged by exposure to temperatures below -22°F
(-30°C) or above 167°F (75°C), or by exposure to humidity in excess of 95%. If
a unit exposed to such conditions fails to operate after it returns to a normal
operating temperature, contact your local service representative.
The MPX 1 doesn't respond to MIDI Program Changes.
The MPX 1 and connected devices must be set to matching MIDI Channels, or
the MPX 1 must have OMNI selected for receipt of MIDI messages. In the
System mode MIDI menu, check the Receive control for the MIDI Channel
selected, as well as the MIDI Channel of the transmitting device.
Make sure that Pgm Change in the System mode MIDI menu is set to On. See
Chapter 6: MIDI Operation for Program Change messages which may be
ignored by the MPX 1.
Check MIDI In/Out connections between the units.
MIDI Program Change numbers are off by 1.
The MPX 1 transmits and recognizes ProgramChange messages 0-127. MIDI
devices which transmit 1-128 rather than 0-127, will be off by 1.
The MPX 1 doesn't respond to SysEx commands.
Check the SysEx setting (and the Receive Device ID selection) in the System
mode MIDI menu.
Low Voltage
Overheating
Common MIDI
Problems