Lexicon
5-1
Chapter 5 Serv ice Notes
Motherboard - lithium battery
The motherboard has a lithium battery. This is not user replaceable. Only a qualified service technician
should replace it. Lithium batteries may be considered a hazardous substance should be disposed of in
accordance with any local, national or international laws or guidelines.
Power Supplies
Various manufacturer's power supplies have been specified for the 960L. There are some slight mechanical
differences in some of these power supplies. Some units will have a power supply with a voltage setting
switch as noted above. Some units will have a power supply that does not have a voltage selection switch
and the AC voltage input will be automatically sensed by the supply. Always be sure to inspect the rear
panel of the 960L for indication of proper AC voltage setup and in case of the need to "switch" for the
appropriate AC input voltage.
Symptoms of possible power supply failures
1. The fan mounted on the processor of the Main PC card and the fan mounted on the right side of the
chassis are spinning in slow motion or not spinning at all.
2. The Larc2 is indicating not seeing the 960L mainframe.
If supply problems are suspected, please test for proper voltage reading with a DMM meter as described in
the Troubleshooting section of this service manual.
Larc2 Meter Display LED Handling
Due to the special storage and handling procedures required for these dry packed moisture sensitive
devices and the sensitivity to temperature, Lexicon recommends that the Meter Board Assembly be
replaced in its entirety when service of the LEDs is required. Spare modules can be obtained from the
factory, Lexicon P/N 021-14511.
Removal and Replacement of Larc2 Piezo Transducer
For units with the transducer soldered (Rev 5 PCB and up):
Removal
1. Wick the solder from the transducer and the PCB solder pads.
2. Re-flow the remaining solder while gently lifting the transducer edge with an X-acto blade.
Replacement
1. Prep the PCB solder pads as needed
2. Assemble the transducer as outlined in the assembly notes on DWG # 080-14234, ASSY DWG, MECH,
MAIN BD, LARC 2
3. Solder the transducer to the six pads provided.
NOTE: Solder the pads alternately across from each other to minimize overheating of the transducer
For units with the transducer epoxied (Rev 4 PCB and below):
Removal
1. Gently insert the blade between the PCB and transducer to pry it loose from the 5-minute epoxy.
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