Emtron DX-3SP - Page 4

12 TROUBLESHOOTING - IF SOMETHING GOES WRONG........................................................................................ 21
12.1 N O POWER .......................................................................................................................................................................... 21
12.2 F AN NOT WORKING ............................................................................................................................................................. 22
12.3 I F THE FAULT LIGHT TURNS ON ........................................................................................................................................ 22
12.4 O VER - TEMPERATURE CUT - OFF ........................................................................................................................................... 22
12.5 O VER - CURRENT CUT - OFF ................................................................................................................................................... 22
12.6 I G 2 BLINKS FAST - N O PLATE VOLTAGE .............................................................................................................................. 22
12.7 S PARKS / D ISCHARGES IN RF AREA .................................................................................................................................... 23
12.8 SWR CUT - OFF .................................................................................................................................................................... 23
12.9 F REQUENT OVER - DRIVE PROTECTION CUT - OFF .................................................................................................................. 23
12.10 T UBE REPLACEMENT ...................................................................................................................................................... 23
13 WARRANTY / SERVICE .................................................................................................................................................. 23
14 GLOSSARY ......................................................................................................................................................................... 24
15 APPENDIX 1: SCHEMATIC DIAGRAMS ..................................................................................................................... 25
15.1 B LOCK D IAGRAMS ............................................................................................................................................................. 25
15.1.1 DX-3SP Block Diagram ............................................................................................................................................ 25
15.1.2 AC INPUT AND WIRING DIAGRAM ....................................................................................................................... 26
15.2 C IRCUIT D IAGRAMS ........................................................................................................................................................... 27
15.2.1 SOFT START Single Phase – Circuit Diagram ......................................................................................................... 27
15.2.2 HIGH VOLTAGE POWER SUPPLY – Circuit Diagram .......................................................................................... 28
15.2.3 RF Module Simplified................................................................................................................................................ 29
15.2.4 RF output circuit ....................................................................................................................................................... 30
15.2.5 QSK – Circuit Diagram............................................................................................................................................. 31
15.2.6 RF Sensor .................................................................................................................................................................. 32
15.2.7 DISPLAY BOARD – Circuit Diagram....................................................................................................................... 33
15.2.8 CONTROL BOARD – Circuit Diagram .................................................................................................................... 34
15.3 C ONTROL B OARD AND A DJUSTMENT P OINTS ..................................................................................................................... 35
15.3.1 Control Board Component Layout ............................................................................................................................ 36
15.3.2 Control Board – Solder Side Track work .................................................................................................................. 37
16 APPENDIX 2: WAVEFORMS .......................................................................................................................................... 38
16.1 QSK S WITCHING ............................................................................................................................................................... 38
16.2 L INEARITY ......................................................................................................................................................................... 38
17 APPENDIX 3: ADJUSTMENTS ....................................................................................................................................... 39
17.1 C ONTROL B OARD ............................................................................................................................................................... 39
17.1.1 PRE-BIAS ADJUSTMENT ........................................................................................................................................ 39
17.1.2 BIAS ADJUSTMENT ................................................................................................................................................. 39
17.1.3 SWR PROTECTION ADJUSTMENT ........................................................................................................................ 40
17.1.4 EBS ADJUSTMENT .................................................................................................................................................. 41
17.1.5 SCREEN VOLTAGE ADJUSTMENT ........................................................................................................................ 41
17.1.6 SCREEN CURRENT LIMIT ADJUSTMENT............................................................................................................. 41
17.1.7 IPTRIP ADJUSTMENT ............................................................................................................................................. 42
17.2 D ISPLAY B OARD A DJUSTMENTS ........................................................................................................................................ 43
17.2.1 PLATE CURRENT .................................................................................................................................................... 43
17.2.2 PLATE VOLTAGE..................................................................................................................................................... 44
17.2.3 REFLECTED POWER .............................................................................................................................................. 44
17.2.4 FORWARD POWER.................................................................................................................................................. 44
17.2.5 SCREEN CURRENT.................................................................................................................................................. 44
17.3 RF S ENSOR (B RIDGE ) A DJUSTMENT ................................................................................................................................... 45