Nokia 8810 サービスマニュアル

P

AMS

T

echnical Documentation

NSE–6

Disassembly & T

roubleshooting 

Instructions

Page 26

Original  08/98

Does the VCO oscillate at any

frequency ?

Change N540

Check VSYN_2

supply voltage

Check VCP voltage line

V621 collector,

~2.6V

V621 base,    1.7V

V621 emitter,   1V

Check V620, L629, C622,

C623

Check VSYN_1 supply

voltage line to V621

Check R623, R622 and

soldered joints

V621 emitter loading    330

Ω

if OK change V621

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

N540 pin 12,  2.3V

~

~

N540pins 9, 16 and 19   2.8V

N540 pin 13 and 22,   5V

~

~

~

~