Service Manual RCI 2900 (ENG)
Contents
1. thanks Homer RCI 2900 AM FM SSB CW MOBILE TRANSCEIVER SERVICE MANUAL ALIGNMENT PROCEDURE A PLL Adjustment 1 2 Turn CLARIFIER Put test probe In AM adjust In USB adjust In LSB adjust Put test probe In AM adjust In USB adjust In LSB adjust Put test probe in the middle position of counter on TP4 unit in 28 0000MHz RX mode L21 to read frequency 17 305MHz 50Hz L22 to read frequency 17 3075MHz 50Hz L23 to read frequency 17 3025MHz 50Hz of counter on TP6 unit in TX mode L27 to read 10 695MHz 30Hz L28 to read 10 6925MHz 30Hz L29 to read 10 6975MHz 30Hz of multimeter on TP7 unit in 28 0000MHz RX mode In AM adjust L17 to read DC 0 85V Put test probe of oscilloscope on TP7 unit in 28 0000MHz RX mode In adjust L18 to maximun output Unit in USB TX mode HOD off Put current meter in TP3 and TP2 adjust VR11 to read 20mA on current meter Put current meter in and 1 first minimize of VR9 then adjust VR10 to read 50mA and adjust VR9 to read 100mA TX adjustaent 1 10 Set unit in AM TX MOD off mode push H L key in H position the power HI LED will illuminate adjust 1 36 1 46 1 48 1 49 1 50 to get stable and maximum power output between 28 29 999MHz Then adjust VR13 to get all TX power within 8V 1 54 Push H L L position to get 14 0 5V in all TX power Return H L to HI position se2. L10 L11 L12 L3 L20 L4 L5 to make maximum AF output Input 6dB from RF SG the AF output must more than 2V sensitivity must not lower than 10dB S N Set RF SG in 60dB when set AF output signal to 2V the distortion must not exceed 10 Set unit in FM mode RF SG in FM mode adjust L6 to get maximum AF output minimum distortion attenuate VOL to 2V output the distortion must not exceec 10 In RF SG input 6dB the sensitivity must not lower than 2048 S N N Set unit in USB mode RF SG and unit select the same channel But set RF SG in MOD off position and also frequency higher then unit for 1KHz Input 6dB from RF SG adjust L14 15 to get maximum AF output and signal output must more than 2V set CLARIFIER in the middle position Set unit in LSB mode check procedure same as USB but set RF SG frequency lower 1KHz than unit frequency Set unit in CV mode RF SG and unit select the same frequency in MOD off position input 6dB from SG to adjust L30 until no AF output Set unit and RF SG in 28 0000MHz USB mode LCD display S RF set 45d8 input in LCD select 45dB RF SG output adjust to read S RF meter in the middle of 9 Set SQ fully clockwise set 66dB in RF SG adjust VR4 to AF just have output Unit and RF SG select the same 28 0000MHz USB mode LCD display S RF set 45dB input in RF SG SQ counter clockwise adjust VR2 to read meter in 9 Fully clockwise SQ set 66dB in RF SG input a
3. djust VR3 to AF just have output Set unit in 28 000MHz RF SG 29 9999MHz input 66dB push keypad NB ANL until LCD display NB ANL Use multimeter to test D2 cathode adjust L1 L2 to get maximum DC voltage Main P C Board L36 Om V VR12 14 VRI3 00 gg 129 128 127 130 L21 vis TEST EQUIPMENT SCHEMATIC DIAGRAM DC POWER SUPPLY DISTORTION TEST EQUIPMENT SCHEMATIC DIAGRAM 100 SCOPE 6MHz SCOPE DISTORTION DC POWER SUPPLY POWER METER COUPLER POWER ANT MULTIMETER TO VCO OUTPUT MICROPHONE BLOCK DIAGRAM PLL CIRCUIT TR29 TR27 TR28 19 305MHz 15 309MHz TRANSMITTER IC10 TR49 51 TRSO TR48 49 MIC RECEIVER 10 6975MHz TR20 21 22 15 305 19 305MHz LCD P C Board w EX 171 0 LED Main P C Board 1 4 ie a b 3 im ee lt u f n A Se amp ba ot CA 2 Z EB ud Piu VERTS 4 T TUN SERE eds Da RN ZA SIERO ZZY TY m t f 7 fo Main P C f AW 4 2 0 EU vote
4. t frequency in 28 0000MHz push METER keypad to have S RF on LCD display Set unit in AM TX MOD off mode adjust VR8 to read RF line right in the middle between red and green line of S RF meter Set unit in AM TX MOD 1KHz 30mV mode turn MIC GAIN full clockwise adjust VR14 to read 90 100 in modulation meter and distortion must not exceed 10 Set unit in AM TX MOD off mode R Beep ON position then release PTT switch scope will have 0 5 sec of Roger Beep tone Select R Beep off set unit from TX to RX vill no receive R Beep tone Set unit in USB TX MOD off mode adjust VR7 to minimum carry power output Set unit in TX MOD on mode adjust VR12 to read 25W 30W in power meter and check transmit frequency 1KHz 250Hz Set unit in LSB TX MOD on mode check power meter to read 25W 30W for all frequency and check transmit frequency 1KHz 250Hz Set unit in FM TX MOD on adjust VR6 to read between 2K 4KHz on modulation meter And check distortion lower than 10 Power output and frequency same as mode Set unit in mode TX MOD on the signal from circuit SPK should have more than 1KHz 4V output MIC GAIN fully clockwise Turn the MIC GAIN counter clockwise slowly the P A output vill reduce RX adjustment 1 Set unit in AM mode squelch in RF GAIN fully clockwise unit and RF SG select 28 0000MHz and 29 9999MHz check two channel Adjust L7 L8 L9
Download Pdf Manuals
Related Search