R.V.R. Elettronica PTRL-NV/2/HP/S3, Technical Manual

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R.V.R. ELETTRONICA S.r.l. (BO) Pag. 40
PTRLNV/2/S3 and PTRL-NV/2/HP/S3 - Technical and Maintenance Manual
3) For each of the selector (13 Fig.1) positions adjust the
corresponding trimmer for the values listed below:
READING VALUE FSD TRIMMER NOTE
+15V 15V 30V R18
+12V 12V 30V R17
+5V 5V 30V R22
PWR FWD 1W-2W-5W 50W R21 0
EXT 24V (OPT) 24V 30V R16 1
VPA VARIABILE 30V R15 2
IPA VARIABILE 6A R19 3
AFC VARIABILE 30V R20 4
NOTE:
1) The reading is OV if not fitted.
2) Use a multimeter to measure the voltage between Vp of Q1 (MJ3001
of the power supply card) and ground and check for the same reading
on the internal meter.
3) For the IPA reading, use a 10 Ohm 5W resistor between Vp of Q1 (MJ3001
on the power supply card) and ground in series with an ammeter and
check for the same reading on the internal meter.
4) Use a multimeter to read the AFC voltage (3-11V) on pin 2 of U7 on
the Main card.
5.6 CALIBRATION OF THE CPU
After replacement, check that the displays function and that
operating frequencies can be programmed using the UP (11 Fig.1), DOWN
(8 Fig.1) and ENTER (9 Fig.1) buttons.
Check correct operation of the DB9 serial port (if fitted). No other
checks are required.
5.7 CALIBRATION OF THE VCO
To calibrate the VCO, carry out the following procedure:
1) Connect the positives probe of a voltmeter to the glass capacitor
(connected to the varicap) and the negative probe to ground.
2) Check that at both limits of the operating frequency band, the
voltage reading lies between 3.5 and 10.3V.
The highter frequency should correspond to the highter voltage and
vice versa.
3) If the voltages in step 2. cannot be verified ie. the PLL is not
locked, the soldered joint, connecting the SL strip-line to ground,