Zonda MZ-X50, Руководство по обслуживанию

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MZ-X50
8
3. CALIBRATION GUIDE
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 voltmeter ).
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 a AM generator to 1000 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
the generator frequency.
Adjust the FI-AM coil (T.104) to obtain the maximum detected signal.
TRACKING-AM
It AM sweeping radiates to a ferrite antenna .
Tunning in 600 kHz and adjust the coil ANT-AM (T.102) to obtain maximum output signal.
Tunning in 1400 kHz and adjust VC.101 to obtain maximum output signal.
Remake the adjust three times to obtain the best adjust point.