Rx Vco Frequency Adjustment - Motorola Cleartone CM5000 Basic Service Manual

32

RX VCO frequency adjustment

Preparation
Press Menu key, numeric key [2] and the Rotary knob simultaneously.
The radio terminal enters T1 TEST mode.
1st Local VCO
This section describes verification method.
STEP 1
Set the radio to channel 3200 using numeric keys and confirm.
STEP 2
Check the voltage of test point TP640. The normal voltage is higher than 2 V.
If the voltage is out of the above range, it means the VCO is unlocked.
STEP 3
Press # the 1st Local VCO is changed from PLL1 to PLL2.
STEP 4
Check voltage at test point TP642 .The normal voltage is higher than 2v.If the voltage is outside the
above range it means the VCO is unlocked.
2nd Local VCO adjustment
This section describes verification method.
STEP 1
Set the radio to channel 3200 using numeric keys and confirm.
STEP 2
Check the Voltage of test point TP644, using high impedance Digital Volt Meter.
The normal voltage of the test point TP644 is higher than 2 V.
If the voltage is out of the above range, it means the VCO is unlocked.
CM5000 Mobile Repeater/Gateway - Basic Service Manual
The VCO used in the CM5000 has no tunable device. No
adjustment is required for the VCO.
The VCO used in the CM5000 has no tunable device. No
adjustment is required for the VCO.
TEST SETUP & ADJUSTMENT