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Customer Care Solutions
RH-18/36/38 Series Transceivers
Troubleshooting Instructions
Issue 1 10/03 Nokia Corporation
RH-18/36/38 Company confidential
Troubleshooting Instructions CCS Technical Documentation
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Page 2 Nokia Corporation. Issue 1 10/03
Baseband troubleshooting .............................................................................................. 5
Baseband test points ....................................................................................................5
Troubleshooting diagrams ...........................................................................................5
Phone is dead ...............................................................................................................6
Flash programming do not work ..................................................................................7
Power does not stay on or phone is jammed ................................................................8
Display information : "Contact Service" .....................................................................9
The phone do not register to the network, or the phone cannot make a call .............10
SIM related faults ......................................................................................................11
Insert SIM card fault ............................................................................................... 11
SIM-Card rejected ................................................................................................... 12
Audio related faults 1: Earpiece and microphone ......................................................13
Audio related faults 2: Headset ..................................................................................14
Charging failure troubleshooting ...............................................................................15
Charging troubleshooting 2 .......................................................................................16
General RF Troubleshooting........................................................................................ 17
RF Key component placement ...................................................................................18
RH-36 Receiver troubleshooting ................................................................................. 21
General Instructions for GSM850 RX Troubleshooting ...........................................21
Troubleshooting diagram for GSM850 Receiver................................................... 22
General Instructions for RH-36 GSM1900 RX Troubleshooting ..............................24
Phoenix commands ................................................................................................. 24
Troubleshooting diagram for GSM1900Receiver................................................... 25
Measurement points in the receiver ........................................................................ 27
RH-36 Transmitter troubleshooting ...........................................................................29
Measurement points for the transmitter .................................................................. 29
General instructions for RH-36 GSM TX troubleshooting .......................................30
GSM850 TX output power...................................................................................... 31
General instructions for RH-36 GSM1900 TX troubleshooting ...............................32
Phoenix commands ................................................................................................. 32
GSM1900 TX output power.................................................................................... 32
Troubleshooting diagram for GSM1900 TX .............................................................33
General Instructions for RH-18/38 GSM900 RX Troubleshooting............................. 35
Troubleshooting Chart for GSM900 Receiver ........................................................ 36
General Instructions for GSM1800 RX Troubleshooting .........................................38
Troubleshooting Chart for GSM1800Receiver ....................................................... 39
Measurement points in the receiver ........................................................................ 40
RH-18/38 Transmitter troubleshooting ......................................................................42
Measurement points for the transmitter .................................................................. 42
General instructions for RH-18/38 GSM TX troubleshooting ..................................43
PCN Transmitter General instructions for PCN TX troubleshooting ........................45
Synthesizer .................................................................................................................46
26 MHz Reference Oscillator ( VCXO )................................................................. 46
VCO ........................................................................................................................ 46
Troubleshooting diagram for PLL Synthesizer....................................................... 47
Phone fails after power on....................................................................................... 48
Measurement points at the VCXO .......................................................................... 48
Measurement points at the PLL/VCO..................................................................... 49
Issue 1 Page 3
RH-18/38 Manual Alignment using Phoenix............................................................... 50
RX calibration ............................................................................................................50
GSM1800 RX calibration ..........................................................................................51
RX channel select filter .............................................................................................52
RX Band Filter Response ..........................................................................................53
Tx Power tuning ........................................................................................................54
TX power tuning GSM............................................................................................ 54
TX power tuning PCN............................................................................................. 57
I/Q tuning ...................................................................................................................59
RF control ..................................................................................................................61
Call testing .................................................................................................................62
Issue 1 Page 4
Company confidential RH-18/36/38
CCS Technical Documentation
Baseband troubleshooting
Baseband test points
This document contains the Nokia 1100 troubleshooting diagrams.
Test points are described and listed in the A3 schematic diagrams.
Troubleshooting diagrams
In this section, Troubleshooting diagrams is provided for the most common problems of
the Nokia 1100
NOTE : Since both D200 (UEM) and D400(UPP) are underfilled, they can not be replaced.
If either D200 or D400 is defective, the whole PWB has be discarded.
Issue 1 10/03 Nokia Corporation. Page 5
RH-18/36/38 Company confidential
CCS Technical Documentation
Phone is dead
This means that the phone do not draw any current at all when supply is connected and/
or powerkey is pressed.
It is assumed that the voltage supplied is 3.6 VDC. The UEM will prevent any functional-
ity what so ever at battery/supply levels below 2.9 VDC.
Phone is dead
Yes
X105 No
Check :
VBAT = 3,6VDC X105
Yes
L260,L261,L262,L263,L264,L265 Check :
C260,C261,C262,C263,C264,C265 No L260,L261,L262,L263,L264,L265
Voltage = 3,6VDC C260,C261,C262,C263,C264,C265
Yes
J404 Check :
Sleep-clock is No B200, C209, C210, PWB. Else
32.768 kHz, 1,8Vpp defective D200*
Yes
J402
PURX = 1,8VDC,
Check :
No PWB.
1 sec. after power-key
Else defective D200*
is pressed
Yes
Check :
C227 No C227, PWB.
VR3 = 2,78VDC
Else defective D200*
Yes
R426 Check :
26 MHz clock min. 300mVACpp, No C227, PWB.
probe Cin=10-13 pF/10M Else defective D200*
Yes
Check :
D450 (Flash).
Else defective D200*
Figure 1: Phone is dead troubleshooting
Page 6 Nokia Corporation. Issue 1 10/03
Company confidential RH-18/36/38
CCS Technical Documentation
Flash programming do not work
The flash programming can only be done via the pads on the PWB (J396).
In case of Flash failure in FLALI station, problem is most likely related to SMD problems.
Possible failures could be short-circuit of balls under