Nokia 3390, 3390b, 3395 服务手册

NPB-1NB

Baseband 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