Lexicon PCM 81 - REV 2 - Section 6: Troubleshooting; Common MIDI Problems; Low Voltage; Overheating

6-2
Troubleshooting
Lexicon
This chapter is intended primarily to help you recognize some
common error states which can be corrected from the PCM 81
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 for service by a qualified technician.
LOW VOLTAGE
In a low-voltage, or "brown-out" condition, the PCM 81 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.
OVERHEATING
Temperature extremes may cause the PCM 81 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.
COMMON MIDI PROBLEMS
The PCM 81 doesn't respond to MIDI Program Changes.
Check Receive control at Control mode 3.1 and make sure it is set
to On. Check the MIDI Channel selected as well as the MIDI
Channel of the transmitting device. Make sure that Pgm Change at
Control mode 3.3 is set to On. Also check MIDI In/Out
connections between the units.
MIDI Program Change numbers are off by 1.
The PCM 81 transmits and recognizes ProgramChange messages
0-127. MIDI devices which transmit 1-128 rather than 0-127, will
be off by 1. Simply adjust by 1 when working with such devices.
The PCM 81 doesn't respond to SysEx commands.
Check the SysEx setting (and the Device ID selection) at Control
mode 3.7.
The PCM 81 does not transmit SysEx Automation commands.
Check the Automation setting (and the target device ID selection)
at Control mode 3.4.