5-14
Troubleshooting
5.13 TX Power Trouble (DCS)
Set
· Phone : Test mode
700CH, 2 level (TCH)
700CH, -60dBm (BCCH)
· Spectrum analyzer as shown in Remarks.
· Oscilloscope as shown in Remarks.
REMARKS
1. Call connection : RF Repairs Program , Tx test
a. Test mode init
b. Test mode set
c. Band , Channel set (DCS , 700ch)
d. Power Level SET (2 level)
e. Tx ON
2. Spectrum analyzer : SPAN = 1 MHz
VBW = Auto
RBW = Auto
Press the trace button of spectrum analyzer on checking test point
and press the max hold of spectrum analyzer
3. Oscilloscope : 500mV/div , 2ms/div
4. RF Cable Loss : about 10dB
START
Check VC-TCXO
[X201 pin 3] is 26MHz oscillation.
Frequency = 26.00MHz
Power
≥
≥
≥
≥
-
15dBm
NO
NO
YES
Check :
· X201 soldering.
· X201 pin 4 DC 2.85V + - 0.1V
· X201 pin 3 DC 1.0 + - 0.1V
Replace X201 if defective.
Check RF Main chip
U201 pin 4,5,6,7
I/Q signal
≥
≥
≥
≥
DC1.35V&0.5Vp-p.
Check :
· U201 pin soldering.
· U201 pin 26,32 DC 2.85V
· Calypso.
· S/W.
YES
Содержание V310
Страница 1: ...GPRS PHONE SERVICE MANUAL MODEL V310 ...
Страница 2: ...Rev 1 00 ...
Страница 6: ...1 2 Introduction Memo ...
Страница 16: ...3 5 Disassembly Instruction 3 4 Exploded View and Parts List 3 4 1 Exploded View Main ...
Страница 17: ...3 6 Disassembly Instruction 3 4 2 Exploded View Folder ...
Страница 43: ...5 20 Troubleshooting Memo ...
Страница 44: ...6 1 6 Block Diagram 6 1 BB Block Diagram ...
Страница 45: ...6 2 Block Diagram 6 2 RF Block Diagram ...
Страница 46: ...6 3 7 Schematic Diagram 7 1 Key Pad ...
Страница 47: ...7 2 Schematic Diagram 7 2 Main Board 7 2 1 Chipset Calypso IOTA ...
Страница 48: ...7 3 Schematic Diagram 7 2 2 Memory Melody Charger ...
Страница 49: ...7 4 Schematic Diagram 7 2 3 Audio ...
Страница 50: ...7 5 Schematic Diagram 7 2 4 I O B d to LCD Connector SIM Interface ...
Страница 51: ...7 6 Schematic Diagram 7 2 5 Camera ...
Страница 52: ...7 7 Schematic Diagram 7 3 RF Schematic 7 3 1 RF PAM ...
Страница 53: ...7 8 Schematic Diagram 7 3 2 RF Main IC ...
Страница 54: ...7 9 Schematic Diagram Memo ...
Страница 55: ...8 1 8 PCB Diagram 8 1 Main PCB Top View ...
Страница 56: ...8 2 PCB Diagram Bottom View ...