Kenwood TH-25AT Service Manual

KENWOOD
SERVICE MANUAL
©1987-12 PRINTED IN JAPAN
B51-3253-00(0)1573
+——_—— CONTENTS!
DISASSEMBLY FOR REPAIR .... 2... 00000 2
CIRCUIT DESCRIPTION 1.0.2... cc cece ccc cence eens 4
SEMICONDUCTOR DATA .......-.000ccceeeeee cee eeeeee 10
DESCRIPTION OF COMPONENTS ..........200000-0002 0002 14
PARTS UIST: fos i0 bale ace dencivy Ba cee cee trgtid etl bien obenub 15
DISASSEBLY ......... 00sec ees c eee e cee et enneeeueeees 28
PACKING: 95-35 sets cece wate dade Bala idaihs auch. Gide eats 29
ADJUSTMENT «io eis ei etait ean ere ace eat ee, Ra eS Bue gs 30
PC BOARD VIEWS/CIRCUIT DIAGRAM
AVR UNIT (X58-3200-10) oe cee cece e eens 34
IF UNIT (X58-3210-11) 2.00.2. 0 ee Stes Sateen ite ten eehaeresd 35
APC UNIT (X59-3220-10) .. cece cece ee tees een e ee neeees 36
PLILUNIT: (X58°3230210):~ cies i rece ecees cee lekrats Ph voreck eters 37
MIC AMP UNIT (X59-3300-XX) 0. cee eee eee eee eee es 38
AF AMP UNIT (X59-3310-10) oo eve cece eee erence ees 39
FRONT-END UNIT (X59-3320-10) .. cece cee eee renee 40
DRIVE UNIT (X50-3330-10) . 2... cee ee eee ees 41
SIGNALING UNIT (X52-3090-10) cc. ee cece cece eee eees 42
CONTROL UNIT (X53-3080-XX) oo. eee eee eee 43
TX-RX UNIT (X57-3160-XX) vec cece eee e eee e eee neeeee 45
SCHEMATIC DIAGRAM ........0 0-0-0002 e eee eee ee eee 47
BLOCK DIAGRAM ........ 0000 cece cence eee eeee 49
LEVEL DIAGRAM 2.0... cece ccc eee ete eet teens 50
TERMINAL FUNCTIONS 0.00... ce ccc eeu eee eee e eens 51
BC-9 (BATTERY CHARGER) ........---.-200ecceeeeeeeee - 51
BC-10 (COMPACT CHARGER) .......---0-.0- 000 ee eee eee 52
BC-11 (RAPID CHARGER) ........-. 000 -cc cece eee ee eeee 53
BT-6 (AAA MANGANESE/ALKALINE BATTERY CASE) ......... 63
DOITA(DG:ADAPTER) 4.6 oie 5.2 28 Se es 8 a ol ete 63
HMC-2 (HEAD SET WITH VOX & PTT) «0... ee eee eee ees 64
PB-5/6/7/8/9 (Ni-Cd BATTERY) «2.02.00 00 0000 cece ee ceeeee 66
SC-14/15/16 (SOFT CASE) 22... eee eens 68
SMC-31 (SPEAKER MICROPHONE) ................... 00000 68
TSU-6:(CTCSS UNIT) 22:2. cee ee a ae ee Eee 69
MB-5 (MOBILE BRACKET)... 000 ccc eee e eee nee e eens 71
WR-1 (WATERPROOF CASE) ..........-0 00sec ee ee ceeees "1
SPECIFICATIONS 1... 0.0000 cece eee eee e eee ee BACK COVER
Photo is TH-25AT.
71

Kenwood TH-25AT Specifications

General

Modulation	FM
Antenna Impedance	50 Ohms
Type	Handheld
Receiver Sensitivity	0.16 µV
Power Supply	Battery pack or external DC power
Frequency Range	144-148 MHz (USA)