Nokia 5510 Troubleshooting Manual page 16

NPM-5
CMT Troubleshooting
 3KRQH 6WD\V 2Q RU LV -DPPHG
,I WKLV NLQG RI HUURU RFFXUV DIWHU IODVKLQJ WKH PRVW SODXVLEOH UHDVRQ LV RSHQ SLQV RQ DQ ,&
1RUPDOO\ WKH &&217 ZLOO SRZHU WKH SKRQH GRZQ DIWHU  VHFRQGV LI WKH ZDWFKGRJ KDV
QRW EHHQ VHUYHG E\ 6: &RQQHFWLQJ DQ RVFLOORVFRSH WR - 'DWD6HO; RQ WKH &&217 FDQ
PRQLWRU WKH ZDWFKGRJ XSGDWLQJ 1RUPDOO\ WKHUH LV D VKRUW SXOVH IURP  WR  HYHU\  VHF
RQGV *URXQGLQJ - FDQ GLVDEOH WKH SRZHU RII IXQFWLRQ
 7URXEOHVKRRWLQJ GLDJUDPDG
Phone unable to stay on or phone
is jammed.
CCONT watchdog is
served,
J200 pulses "1" ->"0"
Software is able to run.
Check UI (keys and display)
Ground the watchdog
(Vbb = 2,8 V)
(VXO = 2,8 V)
PURX (J374) = "1"
(2,8V) after 60 msec.
Check RFC buffer
(V502, R559, C560...)
3DJH 
)LJXUH -DPPHG SKRQH
Yes
Yes
No
See section "Phone is dead"
Yes
Check sleepclk
No
(C220) = 32 kHz
square wave.
Yes
No
Check G502, 26 MHz
Yes
Possible defective ICs :
MAD2 (D300)
SRAM (D302)
FLASH (D301)
CCONT (N201)
1RNLD &RUSRUDWLRQ
PAMS Technical Documentation
No
Check sleepclk circuit
(B200, R214,....)
Yes
CCONT (N201)
or overloads on
the PURX line.
OK
Defective Hagar
Defective
,VVXH