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Failu
re
machi
Determine
ne
the fault
inspe
ction
/
analy
sis
Step explain：
FLASHTOOL half-erasure FLASH： FLASHTOOL half-erasure FLASH no erasure FLASH，
FLASHTOOL erasure FLASH：After erasure FLASH, all information in FLASH will be
erasure and empty.
Specific erasure method can refer to below FLASHTOOL load guidance.
MMI test：MMI test is phone system comes with function self-test software, pass
MMI test can simple and fast judge mobile phone function whether
good. The specific test method can refer to primary service manual.
Complete machine MT test ：
whole antenna signal test, pass MT test can judge mobile signal
whether good. Specific operational approach can refer to RF test
guidance.
Rewrite physics NO. ： Rewrite IMEI 、 SN 、 BT 、 MAC address information. This
2013-10-18
YU220 service manualV1.0
Host machine maintain flow
Flashtool
Software
fault
FLASHTOOL
NFF
Detected no
abnormalities
change FLASH
Scrap
processing
Replace RF class
Hardware
failure
Replace other
（
information of intrinsic RF correct will not lost, it doesn't
need to correct. Specific loading method can refer to below
FLASHTOOL loading guidance.
Huawei secrets, no dispersion without permission
uploa
BOOT
Only
d
（
BOOT，
upload
No erasure
FLASH）
Phone function
tests
Board software
Detection
（MMI
upgrade
and machine
MT test）
erasu
re
FLASH
uploa
flashtool
chip
（ PA 、RFIC ）
chang
CPU
e
devices
recei
、 MIC 、
ver
Touch
LCD 、
And
panel
so
）
on
Complete machine MT test is Part of the
No. rewrite
Write
STP 1：
physics
customized
STP 2 ：
information
RF
upgra
comprehens
Singl
de
ive
e
BOOT
d
measuremen
board
softw
t
ard
Delivery
Compl
of
（
）
ete
Quality
Phone function
tests
（MMI test）
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