User Guide

PAMS
Technical Documentation
RAE-3
8. Troubleshooting
Page 8 – 17
Issue 1 06/01
2.2 General Power Checking
Use BBL-3B service battery. Battery voltage must be 3.7 V.
Switch power
on
VB (C124) and
VB_CCONT
(C115) 3.7V?
Failure in battery line
Check L100, L101 and
X100
PURX (J304) 2.8V
&
SLEEPCLK (J303)
32kHz
(typ. 32.768kHz)?
VBB (C138)
2.8V?
VCORE (C119)
1.8V?
YES
YES
YES
NO
Remove
&
Insert service
battery
Drain of V106 low
around 60–100ms
when battery inserted
Faulty circuit N100 or
faulty 32kHz clock circuit
(B100, C120, C121, C122,
R113, R114 or R115)
YES
NO
Faulty circuit
D101, D102,
V106, R102,
R108 or V102
V2V (C140)
2.65V?
NO
Faulty circuit L102, C131,
V105, R118, L103, V104,
R116, R119, C118, C119
NO
NO
Faulty circuit
N102, C138 or
C111
Faulty circuit
N100, C140 or
R104
Pin 5 of N102
0V?
NO
YES
Faulty circuit
V108 or R105
NO
YES
Supply voltage drops
when the power is
switched on
NO
YES
Short circuit in VBAT, VBB or VCORE line.
Switch power off and measure with multimeter which
of these voltages have a short circuit. Check visually
components which are connected to short circuited
voltage line.
N100
(FIg. 10)
Figure 9.
Oscilloscope screen shot (Figure 10) .