Durabrand MD-K400, Руководство по обслуживанию, Страница: 12 / 58

MD-K400
11
3. CALIBRATION SCRIPT
Obs.: This procedures can be used to orientation , some item can be
changed by the factory engineering for best application and improve the
factoring process.
FM RANGE
Tunning in 87,5 MHz, adjust the coil OSC-FM (L.102) to obtain ~ 2,0 V in the
tunnig voltage (terminal 28 of IC101 with resistor of 10K in serie with the
voltimeter ).
Tunnig in 108,1 MHz, and verify if the tunnig voltage is ~ 7,1 V.
The voltage values can be slightly changed to help the production.
FI-FM
Connect a FM sweepings generator in the FM input.
Tunning the radio in 98,1 MHz.
Verify the shape of curve “S”, in the pin 23 of the IC101.
TRACKING FM
Connect a FM sweeping generator in the FM input.
The generator output must have a very low RF signal and cannot saturate the
IC output (pin 23 of the IC101 ).
Tunning in 90,1 MHz and adjust the RF-FM coil (L.101) to obtain maximum
output signal.
Tunning in 106,1 MHz and adjust VC.102 to obtain maximum output signal
AM RANGE
Tunning in 520 kHz, adjust the OSC-AM coil (T.101) to obtain ~ 1,0 V in the
tunning voltage.
Tunning in 1650 kHz, and verify if the tunning voltage is ~ 6,5 V.
The voltage values can be slightly changed to help the production.
FI-AM
Adjust an AM generator to1000 kHz with 30% of modulation in 400 Hz.
Tunning the radio in 1000 kHz.
Must be used a very low RF signal.
If haves undesirable noises, this frequency can be displaced for + or -, together
with a frequency of generator frequency.
Adjust the FI-AM coil (T.104) to obtain the maximum detected signal.