Sangean H201 Manual do Utilizador descarregar pdf (Página 18)

( 3 ) Weak sensitivity in FM band

Check whether the sensitivity is Yes Check the antenna wire and BPF

recovered if antenna is directly circuit.

connected to the pin 1 of IC2.

Then replace the abnormal parts.

Check whether the IF waveform is

normal.

Check the T2 circuit.

Then replace the abnormal parts.

Yes

Check whether the tuning voltage

is normal.

Check the L6 local oscillator circuit.

Then replace the abnormal parts.

Yes

Check whether L7 and the No

corresponding RF tank circuit are Then replace the abnormal parts.

normal.

( 4 ) PLL does not work

No Check D/D circuit (Q209, D204, D206

& L201) are normal.

Check whether the C245 exceeds

12V DC.

Then replace the abnormal parts.

Yes

Check whether the circuit of LPF

is normal.

Check Q202 and Q203.

Then replace the abnormal parts.

Yes

Check whether the local oscillator

circuit is normal.

Check C10.

Then replace the abnormal parts.

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Sangean H201 Manual do Utilizador Página 18