cromax C2A Manual de usuario
C2A L3 Service Manual
A) Technical Specifications:
Particular
Remarks
Key Matrix For Flashing
NO
Chipset
MT6737V/WHA
Android Version
7.0
Frequency
GSM 2/3/5/8, WCDMA 1/8, FDD1/ 3/ 5, TDD 40/41
Network Mode
SIM1: GSM+WCDMA+LTE
SIM2: GSM
Rom
32GB
RAM
24Gb
Internal SD Card memory
YES
Expandable Memory
NO
C2A L3 Service Manual
Factory mode code
*#*#21719*#*#
Good Earpiece volume
YES
Good Loudspeaker volume
YES
Good MIC volume
YES
Good Vibrator volume
YES
Engineering Code
B) CAUTIONS
I.Flashing & Servicing must be undertaken by qualified personnel only.
II.Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is
worn.
III. Use only approved Tools & components as specified in the parts list.
IV.Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and
alignment
V.Ensure all cables and wires are repositioned correctly if Handset disassembled
VI.Electrostatic discharge can easily damage the sensitive components of electronic products.
Therefore, Service Centre must adhere the precautions which mentioned above.
C2A L3 Service Manual
C) L3 Service Manual
J901 earphone
connect
J1002 Front cam
connect
U706 charge IC
J1801 T-card&SIM
connect
J1101 LCD
connect
Q1001 Front
Flash IC
U4102 Memory
U101 CPU
U2001
PMU IC
C2A L3 Service Manual
J1202 sidekey
connect
J702 Battery
connect
U1403 4G PA
U802 Rear
Flash IC
D805 Rear
Flash LED
J1001 Rear cam
connect
J502 SUB
Board connect
U801 backlight
IC
U1700 WCN IC
U1507 2G PA
U1300 RF
Transceiver
J501 Finger
connect
C2A L3 Service Manual
D) Symptoms
1. Unable to load Software:
2. RF ISSSUE:
2.1 LTE part
C2A L3 Service Manual
LTE/WCDMA Multi-mode PA :
PrimaryAntenna port:
Diversity Antenna port:
C2A L3 Service Manual
Antenna switch receiving ports:
For FDD-LTE(primary) band1 signal comes from primary antenna switch through duplexer U1506 and matching circuit to transceiver RX
ports.
For FDD-LTE(primary) band3 signal comes from primary antenna switch through duplexer U1509 and matching circuit to transceiver RX
ports.
For FDD-LTE band5(primary) signal comes from primary antenna switch through duplexer U1513 and matching circuit to transceiver RX
ports.
For TDD-LTE band40/41(primary) signal comes from primary antenna switch through saw U1520 and matching circuit to transceiver RX
ports.
For TDD/FDD LTE band1/3/5/40/41 (diversity ) signal comes from diversity antenna switch through saw U1607/U1606/U1605/U1603/U1609
C2A L3 Service Manual
and matching circuit to transceiver RX ports
2.2 WCDMA RF power trouble
Check points
-PA connector soldering
-Duplexer connector soldering
-Other Tx RF Component soldering
Wcdma Band I&VIII
C2A L3 Service Manual
For WCDMA RF power:
Step1:check PA connector soldering is ok, if no,,reslodering or repalace
Step2:check duplexer connector is ok, if no,,reslodering or repalace
Step3:check other Tx RF component soldering if no is ok ,reslodering or repalace
2.3 GSM RF power trouble
Check points
-Tranceiver connector soldering
-PA connector solderin
C2A L3 Service Manual
2.4 WCDMA RX trouble
Check points
-Tranceiver connector soldering
-Duplexer connector soldering
-ASM switch connector soldering
-Other Rx RF Component (L/C) soldering
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