Nokia 5510 - Page 16

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CMT Troubleshooting PAMS Technical Documentation
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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)
See section "Phone is dead"
PURX (J374) = "1"
(2,8V) after 60 msec.
Check sleepclk
(C220) = 32 kHz
square wave.
Check sleepclk circuit
(B200, R214,....)
Defective
CCONT (N201)
or overloads on
the PURX line.
Check RFC buffer
(V502, R559, C560...)
Yes
Yes
No
No
No
Yes
No
OK
Check G502, 26 MHz Defective Hagar
Possible defective ICs :
MAD2 (D300)
SRAM (D302)
FLASH (D301)
CCONT (N201)
Yes
Yes
Yes