Emtron DX-3 - Page 4

4
12.4
OVER-TEMPERATURE CUT-OFF........................................................................................................................................... 20
12.5 OVER-CURRENT CUT-OFF ................................................................................................................................................... 21
12.6 IG2 BLINKS FAST - NO PLATE VOLTAGE .............................................................................................................................. 21
12.7 SPARKS / DISCHARGES IN RF AREA .................................................................................................................................... 21
12.8 SWR CUT-OFF .................................................................................................................................................................... 21
12.9 FREQUENT OVER-DRIVE PROTECTION CUT-OFF .................................................................................................................. 21
12.10 TUBE REPLACEMENT ...................................................................................................................................................... 21
13 WARRANTY / SERVICE .................................................................................................................................................. 21
14 GLOSSARY......................................................................................................................................................................... 22
15 APPENDIX 1: SCHEMATIC DIAGRAMS ..................................................................................................................... 23
15.1 DX-3 BLOCK DIAGRAM ..................................................................................................................................................... 23
15.2 CIRCUIT DIAGRAM – HIGH VOLTAGE POWER SUPPLY.............................................................................................. 24
15.3 CONTROL BOARD AND ADJUSTMENT POINTS..................................................................................................................... 25
15.4 CIRCUIT DIAGRAM – AC INPUT AND WIRING DIAGRAM – STANDARD ..................................................................... 26
15.5 CIRCUIT DIAGRAM – AC INPUT AND WIRING DIAGRAM – U.S. VERSION ................................................................. 27
15.6 CIRCUIT DIAGRAM – SOFT START (200 TO 240 V OPERATION) ................................................................................. 28
15.7 CIRCUIT DIAGRAM – QSK ................................................................................................................................................. 29
15.8 CIRCUIT DIAGRAM – RF MODULE................................................................................................................................... 30
15.9 CIRCUIT DIAGRAM – CONTROL BOARD ........................................................................................................................ 32
15.10 CONTROL BOARD – COMPONENT LEGEND (SILKSCREEN TOP) ................................................................................ 33
CONTROL BOARD – SOLDER SIDE TRACK WORK............................................................................................................................ 34
16 APPENDIX 2: WAVEFORMS .......................................................................................................................................... 35
16.1 QSK (OPTIONAL MODULE) SWITCHING.............................................................................................................................. 35
16.2 LINEARITY ......................................................................................................................................................................... 35
17 APPENDIX 3: ADJUSTMENTS ....................................................................................................................................... 36
17.1 CONTROL BOARD ......................................................................................................................................................... 36
17.1.1 PRE-BIAS ADJUSTMENT (Adjustment: POT7, marked PRE_BIAS)....................................................................... 36
17.1.2 BIAS ADJUSTMENT (Adjustment: POT3, marked BIAS)......................................................................................... 36
17.1.3 SWR Protection adjustment....................................................................................................................................... 37
17.1.4 EBS ADJUSTMENT (Adjustment: POT4, marked EBS). .......................................................................................... 37
17.1.5 SCREEN VOLTAGE ADJUSTMENT (Adjustment: POT2, marked SCREEN) ......................................................... 38
17.1.6 SCREEN CURRENT LIMIT ADJUSTMENT (Adjustment: POT1, IG2LIMIT)........................................................ 38
17.1.7 IPTRIP ADJUSTMENT (Adjustment: POT6, marking: IP TRIP) ............................................................................. 38
17.2 DISPLAY BOARD ADJUSTMENTS .............................................................................................................................. 40
17.2.1 PLATE CURRENT (Adjustment: VR4, Marked: AMP)............................................................................................. 40
17.2.2 PLATE VOLTATE (Adjustment: VR2, marked: VOLT)............................................................................................. 40
17.2.3 REFLECTED POWER (Adjustment: VR3, marked: RF R) ....................................................................................... 40
17.2.4 FORWARD POWER (Adjustment: VR1, marked: RF F)........................................................................................... 41
17.2.5 SCREEN CURRENT (Adjustment: VR6, marked IG2+, VR5, marked IG2-) ............................................................ 41
17.3 RF SENSOR ADJUSTMENT ........................................................................................................................................... 42