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.
Summary of Contents for MZ-X50
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