Navman jupiter la000605d User Manual

LA000605D © 2007 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.

on the part. The proper nozzle should also heat the component leads by either hot gas or hot 

bar. The ideal reflow profile should be the same as the one used for mounting the part and 

depends upon the paste used. The reflow zone can be shortened as long as the reflow is 

complete. The part should then be lifted off automatically during the transition from reflow to 

cool down cycles using a vacuum.

4.1.9 Site Redress and Cleaning
Once the part is removed, the site needs to be cleaned for attachment of a new package. 

This may be done by vacuum de-soldering or wick. Low-temperature, blade style conductive 

tools in conjunction with de-soldering braids can also be used. Once all residual solder is 

removed, the site should be cleaned with appropriate solvent such as alcohol and a lint-free 

swab.

4.1.10 Application of Solder Paste
For a precise and uniform solder paste deposition on the redressed site, it is recommended 

that a miniaturized stencil for the individual component be used. The stencil should be 

aligned under 50x to 100x magnification, depending on the part. After precise alignment, the 

stencil should be lowered onto the PCB and the paste should be applied in one pass.

4.1.11 Placement and Attachment of the New Component
The new part should be placed on the site using a split-beam alignment where a dual 

image of the part leads and the land pattern on the PCB can be viewed on a high-resolution 

monitor. Once aligned, the part should be placed on the site and attached to the board using 

the reflow profile used for the part removal.

In normal mode of operation, the baseband processor software runs continuously, providing 

a navigation solution at the maximum rate of once per second. No power saving functions are 

applied.
If the power to the module is disrupted, the restart time can be shortened to a warm or hot start 

by keeping the RTC and SRAM contents valid with a backup battery on the VBATT input.
If the module has been turned off for longer than 2 hours, the unit will revert to a warm or cold 

start. This is caused by the stored ephemeris data becoming invalid after 4 hours.

The TricklePower mode of operation can be enabled to reduce the average power consumption. 

The main power is supplied to the module continuously. An internal timer wakes the processor 

from sleep mode. The module computes a navigation position fix, after which the processor 

reverts to sleep mode. The duty cycle is controlled by a user-configurable parameter.
If ephemeris data becomes outdated, the TricklePower mode will attempt to refresh the data set 

within every 30 minute period, or for every new satellite that comes into view.
With TricklePower set to a 20% duty cycle, a power saving of 50% can easily be achieved with 

minimal degradation in navigation performance.

5.2.1 Adaptive TricklePower mode
In Adaptive TricklePower mode, the processor automatically returns to full power when signal 

levels are below the level at which they can be tracked in TricklePower mode. This is the 

default behaviour when TricklePower is active. Adaptive TricklePower is always enabled on 

the Jupiter 32.