144MHz
FM
TRANSCEIVER
~TH-28A/E
SERVICE
MANUAL
©
1992-5
PRINTED
IN
JAPAN
KENWOOD
>
B51-8170-00(0)
1209
———
CONTENTS
CIRCUIT
DESCRIPTION
...ssccsssecsssscsssecseseesetenneetsns
2
DESCRIPTION
OF
COMPONENTS.
.........-2s0000
13
SEMICONDUCTOR
DATA
....sscssesesscseceesessessneerens
16
PARTS
LIST
ssscssssssssessssssscssssessseeessecseeeeeareseesneess
22
EXPLODED
VIEW
sssesssssscssssscssseceseeseeateatsueesnneens
37
-
PACKING
vicccssescsssssessssseccssnessssesessesesesstansatesneeennes
38
ADJUSTMENT
oiscssssssscsscccsssscssessscesssnseseeessteserenees
39
POWER
MODULE
INSTALLATION
METHOD
.........
43
TERMINAL
FUNCTION.
.....c.ssscsssscsseieceesesessneeeees
44
(190
0445-05)
PC
BOARD
VIEWS
TX-RX
UNIT
:
IF
(X57-404X-XX)
(A/2).
essen
45
TX-RX-UNIT-;
RF-(X57-404X-XX)}(B/2)
49
—
.
CONTROL
UNIT
(X53-340X-XX)
(A/5)
.-e-s-
53
Coe
1634-13)
:
KM,
M2,
X,
P
CONTROL
UNIT
:
CHARGER
(X53-340X-XX)
(B/S)
......
55
(A02-1634-13)
:
T,
E,
E2,
3,
£6
CONTROL
UNIT
:
PTT
(X53-340X-XX)
(C/5)
sseessssssensee
55
Knob
ENC)
CONTROL
UNIT
:
VOL/SOL
(X53-340X-XX)
(D/5)
......-
56
Knob
(VOL
(K29-4774-04)
CONTROL
UNIT
:
ENCODER
(X53-340X-XX)
(E/5)
s..sesssn
56
({K29-4772-04)
VCO
(X58-3870-XX)
«
..eeeseecceseneseneceeneeenensseces
SCHEMATIC
DIAGRAM.
...ssecsesscssssensessesseestenssanss
BLOCK
DIAGRAM.
...sseseesssssssesssssssetseeeee
eeeeeesseeees
Knob
(SQL)
LEVEL
DIAGRAM
....eeccesecsseteceesesestiereeseesnenecenvess
(K29-4773-04)
(K29-4775-13)
Knob
(LOCK)
(K29-4777-04)
Front
glass
(B10-1179-04)
Knob
(K29-4776-03)
Knob
(Key
top)
(K29-4778-03)
PHOTO
is
TH-28A
RRS
ne
ens
nape
spent
BC-15A
(RAPID
CHARGER)
HMC-2
(HEAD
SET
WITH
VOX
&
PTT)
..eseeeeeeeees
66
ME-1
(MEMORY
EXPANSION
UNIT)
.........004+
68
PB-13
(Ni-Cd
BATTERY)
...ssssscsccssssseeeesseseessssnees
68
PB-14
(Ni-Cd
BATTERY)
wessssssssstssseeeseseeeeeeeee
69
PB-17
(HIGH
POWER
BATTERY
PACK)...
70
PB-18
(LONG
LIFE
BATTERY
PACK)
........--.+++
70
PG-2W
(DC
CORD)
o.eescsescssessesstsssesseesesserseeeacees
71
PG-3H
(FILTERED
CIGAR
LIGHTER
CORD)
.......
71
SMC-31,
32,
33
(SPEAKER
MICROPHONE)
.......
72
TSU-7/CTCSS
UNIT
(X52-3170-00)
.....seeeeeeeens
73
BH-6
(SWIVEL
MOUNT)
o....ecsssesssccssseseeeessseerseeens
75
HB-2
(HAND
STRAP)
n.ccessessseccsecssecssscseevecseseseeees
75
SC-30,
33,
34
(SOFT
CASE)
ciescsssccecsseesseeeeees
75
WR-2
(WATERPROOF
CASE)
......sssscceeesesseeseeees
75
SPECIFICATIONS
oo...
eessseesseesseesssees
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