Nokia n-gageqd Service Manual
RH-29
Company Confidential
6b - Baseband Troubleshooting
Nokia Customer Care
Page 16
Copyright ©
2004 Nokia Corporation
Issue 1 05/2004
Company Confidential
and then fed to RFCLK.
In SLEEP mode the VCXO is off. UEM generates low frequency clock signal (32.768 kHz)
that is fed to UPP_WD2, Bluetooth and ZOCUS.
that is fed to UPP_WD2, Bluetooth and ZOCUS.
When the flashing of the device does not succeed, but powering is OK, follow these
instructions.
instructions.
Note: The absence of clocks may indicate that the device (put phone to LOCAL mode
when the sleep is not allowed or press buttons so that phone is not in sleep mode) is in
sleep mode. Make sure that the device is not in sleep during clocks measuring.
when the sleep is not allowed or press buttons so that phone is not in sleep mode) is in
sleep mode. Make sure that the device is not in sleep during clocks measuring.
IMPORTANT: Clock signals have to be measured with 1M
Ω (or greater) probes!
Measure signal from J170. This should be 26Mhz clock signal. See RF Troubleshooting for
further information.
further information.
Check the crystal oscillator (B190) is oscillating at 32.768kHz frequency. If not change
B190. If OK measure sleepclk from J123. Frequency should be the same 32.678kHz (see
Figure 1, “Sleep clock,” on page 17 below.) If not change UEM.
B190. If OK measure sleepclk from J123. Frequency should be the same 32.678kHz (see
Figure 1, “Sleep clock,” on page 17 below.) If not change UEM.
Flash
memories
BT
module
SDRAM
UEM
SIM
ZOCUS
UPP_WD2
MMC
VCXO
RF-ASIC
Mjoelner
RFBusClk
13 MHz
RFClk
26 MHz
SleepClk 32 MHz
CBusClk 1 MHZ
DBusClk
13 MHz
SIMClk
3.25 MHz
FlashClk
Max 40 MHz
SDRAM
Max 104 MHz
LPRFClk
analog 26 MHZ
13 MHz