User Guide

PAMS Technical Documentation Troubleshooting
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If the phone gets ‘dead’ very short time after the power is turned ON, possible reason for this might be
that 13 MHz system clock signal is not coming to the BB. Use the following chart to find the problem.
Oscilloscope
Turn the phone ON and
measure VCTCXO
(G502) power supply
Vtcxo at C543 - 2,7 V
Oscilloscope
Measure 26 MHz
VCTCXO output signal
at C546 - approx. 1.2
Vpp.
Oscilloscope
Measure 13 MHz
buffer input at V502 -
approx. 0.4 Vpp
Oscilloscope
Measure 13 MHz
buffer output at L511 -
approx. 0,6Vpp.
Check CCONT, phone
is ’dead’
VCTCXO is ’dead’ Check HAGAR,
divider by 2 in HAGAR
not in function ( not
enabled)
Buffer transistor not in
function ( V500 )
Reason is something
else ( Software,
battery, etc. )
Yes Yes
Yes
Yes
No
No No No