Kenwood TM-221A Service Manual

144MHz FM TRANSCEIVER
TM-221A/E/ES
SERVICE MANUAL
KENWOOD
©1987-3 PRINTED IN JAPAN
'B51-3217-00 (O) 1551
Knob (Button)
(K29-3058-04) x 3
Metallic cabinet (Top)
{A01-1021-03)
Knob (Button)
(K27-0496-04) x 2
Panel ass'y*
(A20-)
KENWOOD © 14miz FM TRANSCEIVER TM-221A
Knob (Main)
(K29-3060-04)
Knob (Button)
(K29-3070-04)
Knob (Button)*
{K29-)
Knob (Button)
(K29-3069-04)
Knob (Button)
(K29-3067-04)
Knob (Button)
{K29-3065-04)
CIRCUIT DESCRIPTION .........0-c0cee cues 2
SEMICONDUCTOR DATA ...........0seeees 12
DESCRIPTION OF ELEMENTS .............-. 13
PARIS LIST Gs tresses aOae der Beek Gtet a ahs 16
EXPLODED VIEW sis; cntnieiond eh ce aah eeahn 32
BACKING fick rvkin Ge ted hee tke aden dense 33
DISASSEMBLY ...........0eeceeeeceecuee 34
ADJUSTMENT ....... ccc 0ccceeececeuees 35
PC BOARD VIEWS
LCD ASS'Y (B38-0303-05) .......e.ees cues 41
VCO (X58-3090-00) .. 0. ec eee eee cece aces 44
DRIVE (X59-3120-00) .. 00.0. e cece eee eees 41
APC (15059190200)... 05 bs han ahaadneks 42
(F (X60-3140-00): ais-oy caduceus aeredhowd s 42
Knob (VOL, SQL)
(K29-3061-04) x 2
CONTENTS
Microphone*
(T91-)
* Refer to parts list on page 16.
Photo is TM-221A.
SOL (X59-3150-00) 2... ee eee cee 42
MIC (X59-3160-00) 21... eee eee ee eee 42
VOL (X59-3170-00) 2... ee eee 42
FINAL UNIT (X45-1330-03) ... 0... .. ee eee 43
FINAL UNIT (X45-1360-02) .. 2... 2... eee 43
CONTROL UNIT (X53-3040-XX). 2.2.2... eee 44
TX-RX UNIT (X57-3060-XX) 2... ee ee 45
SCHEMATIC DIAGRAM .................044- 49
LEVEL DIAGRAM ...............0-02 20 eee 53
BLOCK DIAGRAM ................200000- 54
TERMINAL FUNCTIONS ................0.- 55
TSU-5 (CTCSS UNIT) ©... eee ee ee eee 56
SPECIFICATIONS ................ BACK COVER