Kenwood TH21AT Service Manual

KENWOOD
SERVICE MANUAL
T-2, DG-21, EB-2, PB-21,
C-8/8T, SMC-30, TU-6
2m FM HAND-HELD TRANSGEIVER
PUSH ON
+5kHz TONE
CONTENTS
CIRCUIT DESCRIPTION ....... 00-0 cc cece cece cece eeceeenes 2
PACKING ... 00.00 cce cece cee eecceeeeeueeaetevennnaes nee 7
PARTS LIST .... 00. ccc cece ee eee ee cece eeeeeeeeeeeenneens 8
PC BOARD VIEWS
SWITCH UNIT (X41-1590-XX) occ ee eee ee eee eee eee eeee 18
TONE UNIT (X52-1270-XX) (TH-21E ONLY) 2... cee eee eee ees 19
DTMF UNIT (TH-21AT ONLY) ... 0. eee cece eee ce ceeeaeaes 19
RE UNIT (X44-1630-XX) oe ce ccc cece eee eeeeeeaeves 20
: IF UNIT (X48-1410-XX) oo. ee cece eee reer ee ene 22
ee an DISASSEMBLY .......0.00 ccc cece cee eee eee eee eee eee 23
LEVEL DIAGRAM.......... 00. ccc cece ee cece eee eeenanes 25
500 ADJUSTMENT .......-0- 0c cece cece cece eeseeeneeeeues 26
BT-2 (AAA MANGANESE/ALKALINE BATTERY CASE) ..........- 29
EB-2 (EXTERNAL C MANGANESE/ALKALINE BATTERY CASE) 29
PB-21 (Ni-Cd BATTERY) ....... 0... ce eee e cece cece eevee 29
DC-21 (DC-DC CONVERTER) ........-..cecceeeeececeuceees 30
SC-8/8T (SOFTCASE) .. 0.2.00. cc cee cece eee eee ee eeeeeae 30
SMC-30 (SPEAKER MICROPHONE) .............-00eeeeeeees 31
- TU-6 (PROGRAMABLE TONE ENCODER) (TH-21A/AT ONLY) ...... 31
WIRING 2.000. c ccc cece eect cence eee eeteeeeeeeeerens 32
REFERENCE DATA ......2.- 20 cece eee cece eeeeeveaeeues 32
SCHEMATIC DIAGRAM (TH-21A/AT) .. 0... ce cece eee eee eee 33
SCHEMATIC DIAGRAM (TH-21E) ......2.- cece cee ceeeeeeees 34
= BLOCK DIAGRAM ............0eceeceesevcseeeeeseeeeee 35
-" SPECIFICATIONS .........0c0c ccc ececeeaeeaeees BACK COVER
Photograph shows TH-21AT type.