Kenwood TH-22A Service Manual

144MHz FM TRANSCEIVER
TH- SOAVAT/ E
SERVICE MANUAL
© 1993-10 PRINTED IN JAPAN
B51-8239-00 (B) 1408
KENWOOD
Knob (ENCODER)
(K29-4875-14)
Antenna
(T90-0472-05)
Front glass
(B10-1202-03)
Knob (VOL)
(K29-4874-14)
Knob (PTT) Knob (4 key)
(K29-4876-03) (K29-4878-03)
3 : am -C ase assy
(oe dare) :
laevis FM TRANSCEIVER TH-22E
(AQ2- 1763-03): TH-22A
(A02-1 764-03): TH-22AT
Key board assy
(S79-041 2-05): TH-22AT
Option (DTP-2): TH-22A/E
PHOTO is TH-22E (WITH DTP-2)
---- CONTENTS --_-
DESTINATION LIST...sssssssssssssssssssssssssssssesssesessersnenere 2
DISASSEMBLY FOR REPAIR ....ssssssssssssssssssssessssnsee 3
CIRCUIT DESCRIPTION ....ssssssssossssssssssesssesserersserorsns 5
SEMICONDUCTOR DATA. csssscsssssssssessssccessnssesenseans 15
DESCRIPTION OF COMPONENTS. .v.sssesssssssssssssses 22
PARTS LIST .ccccssssssssssssossssssesspsssssssssorssssasecaseessanenens 24
EXPLODED VIEW ...sssssssssscsssssssssessessessssstsenssnsnsesnses 36
PACKING... 10.37
TERMINAL FUNCTION o.csccscsccscsscesseeseeseonrere 38
ADJUSTMENT .scscsctectantenssctctntrtectenvestnesnsnene 40
PC BOARD VIEWS
VCO UNIT (X58-4090-00).....scsssssssssssssssssssssseesee 44
TX-RX UNIT (X57-437X-XX) (C/4)scssseessssessssseseses 45
TX-RX UNIT (X57-437X-XX) (D/4).sssssssssssssssssssse 46
TX-RX UNIT (X57-437X-XX) (AVA) sescsscssssssssssssrens 47
TX-RX UNIT (X57-437X-XX) (B/A) sssssscsssssssseseseeee 51
SCHEMATIC DIAGRAM ....sccssssssssssssssssssssssssssssssrens 55
BLOCK DIAGRAM ....sccscsssssssssssssssssssssorssssssssscseseees 59
LEVEL DIAGRAM ...cscccossssssssssssessssesssesorsssesssssseeseees OF
DTP-2 (DTMF KEYPAD) .cssssssssssssssssssssssssssssssssessenes 62
BC-17 (WALL CHARGER)... sessens 62
BT-9 (BATTERY CASE)... - 62
PB-30, 32 (STANDARD BATTERY. PACK).. we 62
PB-33 (LONG LIFE BATTERY PACK) srcsecsosun..63
PB-34 (HIGH POWER BATTERY PACK). 63
SC-37, 38, 39, 40 (SOFT CASE)... sesnaseeseees 63
SPECIFICATIONS ...ccssssssssssssssssessssesee .BACK COVER