Kenwood AT440 Service Manual

KENW-02207
KENWOOD
HF TRANSCEIVER 7 -
CONTENTS
SPECIFICATIONS ..... 0... cecicceee see ecee este eesaeeeeneaeenee 2 PACKING... eeceeceececeeeneceueeseeeueeneecareeateaanee 88
CIRCUIT DESCRIPTION .....c.ccccsescsestesseeseseseees 4 ADJUSTMENT... cccccecscecessccseeeceeneeneeeeaeeeanees 89
SEMICONDUCTORS oo... cececaeeeee eee eeee sere etna ees 27 LEVEL DIAGRAM... .cccceecceseeteeeteeeeetenee san eneas 101
PARTS LIST ......ccciccceeee tees sees eeeeeeeeeeeee eee enenes 35 BLOCK DIAGRAM. ........ccccscceeesesseeeneeeeneeeeanens 103
PC BOARD SCHEMATIC DIAGRAM OPTION
SWITCH UNIT 0000. ee ee eeeeee ee ea tenes 69 PS-5O ooo cece cece e eee ete eeeneeeeeneneentnenenenees 104
FILTER UNIT... cece cece seers nance es 70, 71 PS-430 oc eceeee sees cece eee ea eee ee neuen eeeeaeeeaaeeees 109
PLL UNIT o o . cece eee eee e eect nee een eed 72,73 VENT ieee c eee reece eee seaa sree eeaeeaeneeeedeennes 111
RF UNIT... cece tec ee eect ene een eee n eee naes 74, 75 SP-430 oo ccecc cece eeseceeeeeseanteee ence eeeeneenea 114
CONTROL UNIT 200... eee eee e eee ee ees 76,77 MB-430 oo. ceccccccca sects ceeeeeaeeeeeeeeee eee eenesedaes 114
DISPLAY UNIT ....... ccc ee eee eeeneneen eens 76, 77 AT~440 ooo eee te eee ertine nee ete 114
FINAL UNIT 0.
cce cece ee ere eeeenu een eneeenaee 78
YK-88S/SN occ ceeeecceeeeeeeenaeeesseaeeseenee es 114
TF UNIT ooo.
cccee eee eet eee eee eee ee sense eet eeeeeees 78,79
0d: 25 OF] 0! \ es
114
AT UNIT ooo. cece cece erent cnet eeeee ere neeeeeeanatege 80 SCHEMATIC DIAGRAM ......ccccccececececcecececceces 113