Nokia NSE–6 Series Disassembly & Troubleshooting Instructions page 26
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Also See for NSE–6 Series:
- Service manual (258 pages) ,
- Technical documentation manual (20 pages) ,
- Tuning instructions (12 pages)
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VHFLO
NO
N540 pin 12, 2.3V
~
NO
N540pins 9, 16 and 19 2.8V
~
YES
NO
N540 pin 13 and 22, 5V
~
YES
Change N540
NO
Does the VCO oscillate at any
frequency ?
YES
Check VSYN_2
supply voltage
Check VCP voltage line
V621 collector,
NO
~2.6V
YES
NO
V621 base, 1.7V
~
YES
NO
V621 emitter, 1V
~
YES
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
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