NISSEI
SERVICE MANUAL
DG-503
RANGE : 1.6 - 525 MHz
Max. Power : 200W
Страница 1: ...NISSEI SERVICE MANUAL DG 503 RANGE 1 6 525 MHz Max Power 200W ...
Страница 2: ...1 Test equipment 3 2 2 Forward power 125 525Mhz 3 2 3 SWR alignment 125 525Mhz 4 2 4 Forward power 1 6 60Mhz 4 2 5 SWR alignment 1 6 60Mhz 4 2 6 Final alignment 4 2 7 Alignment spots photo 5 3 SCHEMATICS COMPONENT PLACEMENT 3 1 Main board schematic 6 3 2 Main board component placement 7 4 EXPLODED DRAWING PARTS LIST 4 1 EXPLODED DRAWING 8 4 2 PARTS LIST 8 1 ...
Страница 3: ...z 145MHz 435MHz Power Range 0 200W Accuracy 5 Minimum Power for SWR 1W Input Output Connector SO239 N female option Weight Net 750 g Insertion Loss Less than 0 1 dB Testing Function Fwd Ref Power VSWR ratio Input Output Impedance 50 Ohm Dimension W H D mm 140 x 84 x 122 Accessories Operation Manual 12V DC Wire FRONT PANEL 1 2 FRONT REAR PANEL 1 LCD Display Indicates FWD REF and VSWR 2 HF V UHF ban...
Страница 4: ...to VHF 145 130 MHZ position M Connect BIRD 4421 dummy load Record forward power and SWR from BIRD 4421 B Turn dual band transceiver to UHF at 435 130 MHz position M Connect BIRD 4421 dummy load Record forward power and SWR from BIRD 4421 C Turn DG 503 to VUHF DG 503 replace BIRD 4421 D Press PTT adjust CV1 on coupler until the reading of forward power is same as record from point B E Turn transcei...
Страница 5: ...gnment 1 6 60 MHZ A Turn HF transceiver to 28 5 MHz connect BIRD 4421 DG 503 50 Ohm dummy load B Turn DG 503 switch to HF connect coupler plug into JP1 on PCB C Push PTT tune transceiver power to get 100W shown on BIRD 4421 D Use ceramic driver to adjust R2 HFFWD on the PCB until DG 503 reading 100W is shown 2 5 SWR alignment 1 6 60 MHz A Turn HF transceiver to 28 5 MHz connect BIRD 4421 DG 503 25...
Страница 6: ...2 7 Alignment spots photo PCB C driver board 5 ...
Страница 7: ...3 SCHEMATIC 3 1 Main board schematic 6 ...
Страница 8: ...3 2 Main board component placement 7 ...
Страница 9: ...Plastic front panel 1 5 Lens PMMA 1 6 Display LCD display 1 7 Backlight LED backlight sheet 1 8 Button Push button 1 9 PCB PCB_B_Main Board 1 10 Screw 6 11 PCB PCB_C_Driver Board 1 12 PCB PCB for slide SW 1 13 Sensor x2 HF and V U HF 2 14 Socket 13 8V 1 15 Screw 6 16 Chassis Base cabinet 1 17 Stand Rubber stand 4 18 Screw 4 19 Screw 4 20 Chassis Top cabinet 1 8 ...
Страница 10: ...Brand Nissei Type DG503 Complaint Bad read out or 000 read out If the display shows 000 pls refer to the photo and apply fully soldering at the said 5 points ...
