NEC Barracuda Service Manual page 133

8.5 Cradle Function Test Error
Symptom:
Cradle Function of COM1,USB does not working property.
Cradle Function Test Error Cradle Function Test Error
Is the
power AC adaptor Connected
to PDA?
Yes
Yes
Is the
Cradle Connected to PDA
Property?
Yes
Yes
Try another known good Try another known good
Cradle Cable Cradle Cable
And Test again? And Test again?
No No
Replace Replace
Motherboard Motherboard
Barracuda PDA Maintenance
No
No
Connect
AC adaptor
No
No
Re-connect
Cradle Cable
Yes Yes
Replace the
Faulty
Cradle Cable
Board-
Board
Troubleshooting
Troubleshooting
Check the following parts for cold solder or one of the following parts on
the mother-board may be defective, use an oscilloscope to check the
following signal or replace the parts one at a time and test after each
replacement.
Parts:
J18 R16
U44 R18
U12 R20
L27 R19
L28 R21
L29 Q1
L30 R296
L31 R297
L32 R383
L33 R384
L34 C247
L35 CP1
R14 CP2
- level
level
Signals:
VCC3 USB_N-
VCC_P+ USB_P+
SA_D[16:31] USB_PW
COM1_DCD# CTS#
COM1_DTR# RTS#
COM1_RTS# DSR#
COM1_CTS# DTR#
COM1_DSR# TXD
COM1_TXD RXD
COM1_RXD DCD#
USB_SA_N
USB_SA_P
CRADLE_IN
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