CCE MD-K777, Service Manual

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MD-K777
4. CALIBRATION SCRIPT
Obs.: These procedures can be used to orientation, the factory engineering can change some item for
best application and improve the factoring process.
FM RANGE
Tunning in 87,5 MHz, and verify if is 2V in the tunning voltage (terminal 28 of IC101 with resistor
of 10K in serie with the voltimeter).
Tunning in 108,1 MHz, and verify if the tunning voltage is ~7,0 V.
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 IC.101.
AM RANGE
Tunning in 520 kHz, adjust the OSC-AM coil (T.104) 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.105) to obtain the maximum detected signal
TRACKING-AM
Irradiate an AM sweeping to the ferrite antenna.
Tunning in 600 kHz and adjust the coil ANT-AM (T.103) 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.