User Manual

Troubleshooting68P09255A57-2

Aug 2002

SC4812ET Optimization/ATP Manual Software Release R16.1.x.x

PRELIMINARY

6-9

Checksum Failure

The CSM could have corrupted data in its firmware resulting in a

non-executable code. The problem is usually caused by either electrical

disturbance, or interruption of data during a download. Attempt another

download with no interruptions in the data transfer. Return CSM board

back to repair center if the attempt to reload fails.

GPS Bad RX Message Type

This is believed to be caused by a later version of CSM software (3.5 or

higher) being downloaded, via LMF, followed by an earlier version of

CSM software (3.4 or lower), being downloaded from the CBSC.

Download again with CSM software code 3.5 or higher. Return CSM

board back to repair center if attempt to reload fails.

CSM Reference Source Configuration Error

This is caused by incorrect reference source configuration performed in

the field by software download. CSM kit SGLN1145 and SGLN4132

must have proper reference sources configured (as shown below) to

function correctly.

CSM Kit No.

Hardware Configuration CSM Slot No. Reference Source Configuration

SGLN1145 With GPS Receiver 1 Primary = Local GPS

Backup = Either LFR or HSO

SGLN4132ED

or later

Without GPS Receiver 2 Primary = Remote GPS

Backup = Either LFR or HSO

Takes Too Long for CSM to Come INS

This may be caused by a delay in GPS acquisition. Check the accuracy

flag status and/or current position. Refer to the GSM system time/GPS

and LFR/HSO verification section in Chapter 3. At least 1 satellite

should be visible and tracked for the “surveyed” mode and 4 satellites

should be visible and tracked for the “estimated” mode. Also, verify

correct base site position data used in “surveyed” mode.