Kenwood TS-770 User manual

NF
KENWOOD
SERVICE
MANUAL
Model
TS-770
V-UHF
ALL
MODE
DUO
BANDER

CONTENTS / FEATURES
FEATURES ......
CIRCUIT DESCRIPTION ... z see 8
SEMICONDUCTOR/FILTER DATA . ee AS:
OPTION(BU-1).. 16
OUTSIDE VIEWS 7
PACKING 19
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PC BOARD VIEWS...
FEATURES
144/430 MHz, all mode (FM, SSB (USB. LSB), CW)
transceiver.
Microprocessor
controlled
VFO
and
full
variety
of
aux-
iary functions.
FM circuitry based on KENWOOD’s advanced technology
and outstanding SSB quality
Built-in VOX
Built-in side tone and CW circuitry capable of semi-
break-in operation.
Easy-to-operate 1 band, 1 MHz VFO stops at 999.98 kHz
or is continuously adjustable (endless system).
Built-in digital display that indicates operating frequency
in all modes.
Digital
display
equipped
with
easy-to-read
green
phosphor
tubes.
7-digit
digital
display
that
directly
reads
down
to
100
Hz
Frequency
indicator
that
reads
out
carrier
positions
when
mode
of operation
is changed.
Indicates
fixed
channel
(stores
any
given
frequency)
and
call channel
frequencies,
besides
VFO
A and
B frequen-
cies
Digital
display
indicates
which
VFO
(A
or
B)
is
in
use,
fix-
ed channel
numbers
(1 through
8).
The use of display select circuit turns off the 100 Hz
digits in FM mode.
Dependable electrical and mechanical functions.
VFO frequencies are switchable in 2 speeds. SLOW (in
20 Hz steps) and FAST (in 200 Hz steps).
VFO knob equipped with variable torque mechanism.
Pushbutton band select switches (UP and DOWN) that
shift up and shift down frequency between 144 MHz and
440 MHz in 12 bands at 1 MHz intervals.
Wide band design for both transmitter and receiver that
eliminates the need for tuning the RF circuits.
DISASSEMBLY.
TROUBLE SHOOTING
ADJUSTMENTS.
sheeted
beaters
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LEVEL
DIAGRAM...
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CIRCUIT
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80
REFERENCE
DATA
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84
MEMO.........
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86
SPECIFICATIONG.........
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89
'® Panel layout based on human engineering.
‘© Full variety of indicating functions to check operating
conditions (Pilot lamps: ON AIR, Hi/LOW (FM transmit),
F-LOCK,
RIT.
SLOW/FAST,
Back-up
power
ON/OFF).
© Amplified type AGC and ALC circuits that maintain
receive
and
transmit
outputs
at
constant
level
without
distortion.
4. A multitude of auxiliary functions for more enjoyable
operation
‘© The use of RAM memory system microprocessor enables
any given frequencies to be stored in or cleared from fix-
ed channels (8 CH).
@ Built-in back-up power circuit to keep data stored at all
in scan and search circuits.
© RIT circuit functions on VFO, fixed channels and call
channel.
© Adoption of frequency lock circuit.
@ KENWOOD's unique noise blanker (NB) circuit to
eliminate pulse type noise.
‘© Equipped with two meters, one is an "S” meter (with
RF/ALC selector) and the other is a center meter for use
on FM.
© RF power HIGH/LOW selecting function provides con-
venience in transmission with local stations.
Auxiliary (AUX) socket.
Designed for fixed and mobile station services.
AC/DC 2-way power operation.
Equipped with a grip for carrying convenience
Sufficient AF output power (2.5W/40).
Built-in large sized speaker (7.5 cm).
connecting jack.
eocon
External speaker

CIRCUIT.
DESCRIPTION
GENERAL
This
unit
is
a
high
class
home
transceiver
having
All
Mode
VHF
(2
ml
UHF
(70
cm)
Bands
designed
for
amateur
radio
stations
8y
microcomputer
control.
it
covers
the
amateur
bands
of
144
MHz
~
146
MHz.
430
MHz
~
440
MHz.
The
modes
of
the
radio
waves
are
A,.
As),
and
Fs,
FREQUENCY
CONFIGURATION
The
unit
consists
of
frequency
composition
shown
in
Fig.
1
tn
Table
1.
the
oscillating
frequencies
of
each
osciltaung
cir
cuit
are
shown
Table
1.
Oscillator
frequency
of
each
oscillator
circuit
Une
Mode/Freaveney
|
Oscilator
Feaveney
CAR
amt
us8.cW-R
|
Bea1SMie
use
8.8285
Mie
f
8.830
MHz
owt
8.8307
Mis
‘Fun
sé.
iS8.cw
|
30430Mne
Furie
430MM
band
|
15.8888
x
18
ne
(vax
unin
16.1666
18
MHz
1F
nie
Fu
Tx
[emi
RE
unt
eM
AX
22.055
Me
v6O
uni
‘Ail
mod
1224
~
1274Mie
RE
unit
(X44-1270-00)
From
VCO
unit
vee
vera
Wath
the
exception
of
FM
ransmission,
all
modes
adopt
the
double
conbersion
system
9
SSB
or
CW
transmit
mode,
the
CAR
oscillator
frequency
{8
83
MHz)
1s
modulated
by
audio
signal
to
obtain
883
MHz
in
the
1st
IF
This signal
1s
mixed
with
30.43
MH2
to
obtain
21.6
MHz
wn
the
2nd
IF
In
FM
transmit
mode,
the
21.6
MHz
crystal
oscillator
circurt
1
the
IF
uni
is
directly
modulated
The
122.4
MHz
band
of
VCO
is
mixed
with
the
21.6
MHz
of
the
2nd
IF
to
obtain
3
144
MHz
band
heterodyne
signal
which
is
fed
to
the
final
unit,
The
430
MHz
band
heterodyne
signal
1s
mixed
with
the
286
MHz
(or
291
MHz)
band,
15.8888
MHz
(or
16.1666
MHz)
local
oscillator
frequency
multiplied
by
18.
and
the
VCO
frequency
of
122
4-127
4
MHz
to
obtain
2
heterodyne
signal
of
408.4-418.4
MHz
This
signal
's
mixed
with
21.6
MHz
to
obtain
a
signal
of
430
MHz
band
which
1s
fed
10
the
final
unit
In
recewe
mode.
the
signal
1s
RF
amplified
and
mixed
with
the
band
heterodyne
signal
to
obtain
21.6
MHz
in
the
1st
IF
In
SSB
or
CW
mode,
the
signal
is
mixed
with
30.
430
MHz
t0
obtain
883 MHz
in
the
2nd
IF
In
FM
mode.
the
signal
is
mixed
with
22.055
MHz
10
obtain
456
kH2
in
the
2nd
IF
wae
a3
unr
tat
ay
ssomnriw
Le
Fig.
1
Frequency
configuration

CIRCUIT DESCRIPTION
Table
16.
Functions
of
Digital
Unit
IC38
MN
9004
Table
17.
Functions
of
Digital
Unit
(X54-1460-00)
ave | [ome ae Descinon
(= SPs
=e
4 coi © | Count prohibited at FIX channel.
° Open at FIX. normally grounded.
scan,
band
and
H.H.
°
Hat
display
of
9th
digit,
3 010 © | Hatscen, search, empty FIX
O | Lat FIX, VFO-B, H at VFO-A,
channel.
°
figure
latch,
strobe
signal.
°
6
Gor
©
|
Buzzer
output.
FIX
channel,
°
Frequency
disappears
at
FIX
empty.
figure latch. strobe signal.
°
7 coe © | Delivers output execpt at 20 «Sec
° Digit scan signal.
9~13 |co4~o © | Strobe signals of 100 kHz. 10 kHz,
° PLL band data output,
w~17/a13~0] 2 Ainpur
°
1e~21/aiz~o|
o
B
input
°
Hatscan
ON,
normally
L.
26 | tst | o Nocona oper:
° Lat squelch ON, H at OFF,
27 RST ° H level
° LatVFO A, 6.
28 csucT ° ‘Same as pin 2
a ‘Open at FIX, normally grounded.
30 | snsi | 0 Count input
Normatty open.
31~34|/D00~3
© | Band data, binary output
° Normally grounded.
38~98 |004~7 © | Fix channel gue. binary
° Lat Flock nermally open
40
osc
°
Clock
signal.
400
kz
<
Hat
FIX,
memory
switch
ON.
g
¢ VFO pulse
g .
2 | weenbel aan
oi | Reasacae eater cate
=
P
é
$

CIRCUIT
DESCRIPTION
(From page 11.)
a
Selector
signal
ourput
to
IC34
and
35.
Transmit
prohibit
signal
at
scan,
search
and
FIX
empty.
Latch
strobe
signal
10 Hz ~ 400 kHz data ourput
Band
data
output
FIX
channel
figure
output
Buzzer pulse output
ALL
ASS'Y
UNIT
(X60-1050-00)
The
PLL
cwcurt
includes
VCO,
A
LOOP
and
8
LOOP
units.
1, B LOOP Unit
A
signal
of
13.215
MHz
is
oscillated
by
Q4.
The
10
and
100
kHz
data
from
the
digital
unit
are
converted
into
an
analog
signal
a8
a
bias
signal
to
D2
by
the
resistors
A25-37
(0
control
the
frequency
of
0-980
Hz.
The
frequency
1s
doubled
by
Q6
as
3
HET
signal
to
the
B
LOOP.
Q1
is
VCO
oscillator
for
B
LOOP.
The
signal
from
the
oscillator
passes
through
the
butter
O3
and
is
mixed
with
CAR
8.83
MHz
by
ICT.
then
the
frequency
difference
is
mixed
with
HET
signal
for
8
LOOP
by
IC2_
The1
kHz-100
kHz
data
from
the
digital
unit
is
divided
by
IC3
to
produce
1
kHz
signal.
This
signal
1s
compared
in
phase
with
the
reference
signal
from
A
LOOP
by
14.
The
output
passes
through
the
low
pass
filter
Q6-8
10
produce
VCO
control
voltage
for
B
LOOP
to
control
Q1
The
output
from
Q1
passes
through
the
buffer
Q2
to
produce
the
output
to
B
LOOP
2. A LOOP
A
signal
of
14.190
MHz
is
oscillated
by
Q1.
This
signal
is
doubled
by
Q2
and
tripled
by
Q3
to
produce
HET
signal
for
A
LOOP
The
signal
from
the
VCO
unit
is
mixed
with
the
HET
signal
by
(C1,
amplified
by.
IC2
and
then
mmxed
with
the
signal
trom
8
LOOP
by
IC3.
The
BAND
data
from
the
digital
unit
is
fed
to
IC4
so
that
the
signal
from
IC3
18
divided
into
100
kHa.
A
signal
of
8
MHz
1s
oscillated
by
ICS.
This
signal
is
divided
to
obtain
100
kHz
signal
as
reference
signals
for
8
LOOP
and
A.
LOOP,
and
is
compared
in
phase
by
IC6.
The
output
from
IC6
is
VCV
which
ontrols
VCO
of
the
VCO
unit
Analog
signal
from
the
BAND
data
is
obtained
from
IC7
This
signal
is
tuned
by
T1
and
T2
to
obtain
5
MHz
bandwidth
‘When
the
signal
1s
unlocked,
D4
of
D5
is
ON.
producing
UK
signal
of
H
level
3.
VCO
Unit
(X50-1520-00)
Frequencies
are
controlled
by
the
VCV
voltage
of
VCO
[01)
The
signal
passes
through
the
buffer
Q2
and
is
fed
to
A
loop
Q3
and
Q4
form
the
buffer
of
VCO.
When
the
signal
1s
un-
locked,
the
UK
signal
turns
Q9
to
ON
and
tums
Q8
to
OFF.
80
the
butfer
stops
and
no
output
is
obtained
from
the
VCO
terrninal
Q6
and
Q6
form
a
circuit
to
short
the
VCV
terminal
when
the
voltage
at
PL8
drops
momentarily.
When
the
signal
is
unlocked
during
adjustments
or
repairs,
turn
OFF
the
power
switch
and
then
turn
ON.
The
signal
will
then
be
locked
Sess sa
i
aoe)
‘Ai om (9CD v5
Fig.
19
PLLIANC3
PLL(B)IC2ITA7310P)
13

14
CIRCUIT DESCRIPTION
Truth
Table
TD341928P
i i
pcint6ot fe Prove |} 1-013 Pout
T’R21|_comocrotor eis pine Input ta Output tert
! ! int] Coonk veo | _Outour
beg ‘up. |-down|Strobe| Clear Bowrow] Cay
'
!
pce
|
pce aye
le
lo
lalelelo
fa
os vo fe 1 one + [= [0 | 0 fpmfenlonfonananfenon| Note forer
ee
eno
Fj
—01r
=
1
fe |e
[rfolols]s
elo]
reer
ores
gt
1 Fd
i
'
=
fe fe
Lt
[fete
fe
fofofolo
[nore
rote
° peas 7 Li
ve
20h
freranesee|
T—orenes
11a
ta
)o
telele|-ffololol
1
|.
i TT tt
Las 3 2 1112 [0 fel *[*[efofsfofol + |
wes og bon
sins
2385
3f+]+
fo
[el-l+lefifrfofof
>
[1
bine
oF
bee
2fa [+ fo felefe[efofofsfo] + | s
Fig,
20
PLL(BJIC4{MC145688)
sta
{+
fo
[el-l*[efrfolfof
s
[1
eft fs fo [fel fefolsfafof a [1
71+ [2 [oe [e[efeleh 1 [4
@
f+ [+
[eo
f-fefe[efo
1
[4
‘ul a] ¥ce 9 [ss ]o [-fefe[efs mr
To ° 1 1 oO jeieieieso 4 1
Bourl2 > jain 1 1 1 o jeyeisieyt 1 1
Aout
=
en
|
Jovear
ttre
[st
[elsfe[eftteiete
is
[st
Down
c
2]
+
[+
fo
[fel
fefofofofs]
+
[1
DOWN
TG
ad
ci
s]sorrow
|
&
|
he oft ft fo [elf fefrfofofr] + [a
3 ] carr
couNT i il bea 1 fala fo fefefefefofofola] 1 fa
ro] ide vlel:|o olififo] + | a
2S tis [tli t[r[t[ it [ot
GNo[ e E 4 2}0iNn
| J] Tht be FEE EE Lelefel fo
1 [| of7 | o [eff [ fofofofol o | 1
IC4(T0341928P)
PLLIANCA(TD3- ) ahacachonlelaleslalelelit ala
Note 1: The state of SORROW Output and CARRY Output will depend on
4, Be gMeSIAB.C.D Output and Down Coun Count nous
oor}
Que 15) Voo 2: th Bit time prior to the time the clock input changes from "0" to
y
our [Dore 44: To=1: Bittime efter the clock input changed fom “O" tot"
Q sooo] fDQues
Vs] FQse0 RB ye
1 Lois
Press
Frea.
PLL(A}IC5(SM6422A) Detector Pu uF
v |} o 4 Amottor
; Le, 404 Los
owe
.
Pome
Fig. 21 ve
LSie
po
oF
Press 2 04 +O 10 ones,
Fre.
Decector
2 oz eosin 14
Hos GNO=Fin 7
Fig. 22 PLLIANIC(MC4044P)

SEMICONDUCTOR/FILTER DATA
*
In
case
of
replacing
power
transistors
of
the
FINAL,
always
use
those
based
on
TRIO
Specifications.
Table 18. 28C2381 Retings Table 19. 2SC2380 Ratings
Name
|
28C2381,
TRIO
Name
|
25¢2380,
TRIO
‘Application
|
UHF
band
power
amplifier
|
Application
|
UMF
band
power
ampiifier
Construction | NPN Epitaxial planar type | Construction NPN Epitaxial planar type |
I
Tal
I
Yeo
Weeo|Yewo|
tc
|
te
|
Pc
|
T
|
Ta
Need
Vero\¥eso)
te
|
te
|
Pc
|
Ty
ste
Absolute maxi|" te [re] a] | Absolute mani, “tt | | | |
mumratng
|
3
[1
[as|
6
|-6
|
@
|
Hs
[ex
mumatig
|
35
|
17
35/28]
28]
»
|i7s
-emd
|
+=
250
[yiv][vjalalw]<l
©
Mm=28°
Vivivlalalwiel
Test
condition
Testcondition
|
Ts
=
25215
-c
|
Test
specification
1
|
Test
specification
en
:
tom
Condition
|
Code
pastel
Une
Condition
Code
Man
Min|um
Coheeraial
Tye
sav
28
1
carer)
teve_1—
[18]
ma
abt an stg fe = 10mA, | = 2mAste- 0) Yinmeao | 35] — | ¥
Ssentsounvtege | f= 25m, Yonceo[7[—-|¥| | = Hoan, tu=0 | Ynceo [|= 1¥
Sana
Ima
te-0
|
Yaneso
[5]
—|
¥
Soomvoage
|
te
=
200A.
te
0
|
Vinnieso
35)
-
1
V
Scans
—[verzavitewaa
|
te
[w]=[=
een
Wees
SV
te
uss
|
te
[l=
—
S| Yeu=I0¥, 1g=0, 16s] Coo | — | TACO [Vew=10¥ te O,t= MRE, Coy | — |
wut
power
|
Yee=I26¥,
t=
ATOM
Tw
lot
1
jer
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0
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TT
uiputpower
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Tims
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uf=[w
Table 20. 28C2103A Ratings Table 21. Filter L72-0312-05(CFL-455F2)Ratings
Name | 28¢2103A, TRIO jee
1
‘pplication | UHF band power amplifier
=
Le
a
Nominal
center
frequency
455
kHe
Construction
|
NPN
Eptaxil
planar
type
3.48 bancwactn “EB HE oF more
Vero]
Vena]
eno]
te
|
te
|
Pe
|
T
|
Tue
onan] veo] e |e | l
mum
rating
40
|
18
|
40
|
60
|
-60)
so
|
175
|
-5~175)
6
dB
bandwidth
$7.8
Wie’
site.
Mm=asrcl
vi
vlalalw]<]
7
(From
455
kHz)
:
Test
condition
|
Ts
=
215
°C
70
dB
bandwidth
‘£16
kHz
oF
Test specification
8 of more
Guaranteed attenuation as =
item Condition 40 68 or more
[tron | Yeu = 8V. te =0 Riople 3.48 or less
tu
en
ge_|
Ye
1OmA
fy
0
loss
4.48
or
lose
ie =5mA, Ty =O
|
_
bso
goes
rotage
Impedance
15K
| Soemarage Te =tmA, te =0
OCanptia”
Tye
=5v,
Ie
=3A
Cetera
oO
|
ven
=10V,
te
0,
f=1
Mi
power | Yoo =128¥, f= SMe
‘Output
pows
Pi
420,
MBO
16

FILTER/OPTION DATA
Table 22. Ratings of Crystal Filter L71-0209-05(21G20A)
Table
23.
Ratings
of
Crystal
Filter
L71-0208-05(YK-88S)
hem
Nominal canter frequency
Specification
21,6 MHz
Pass bandwidth £10 kHz of more at 3 dB
[Attenuation
bandwisth
#35 kHz or loss at 18 48.
Ripple
0.5 dB oF less
Loss 2 dB or less
-
em
Specification
[Nominal canter frequency | G850 Ke
‘Center frequency devistion| Within + 150 Hz at 6 dB
Pass tandwidth E12 kis or more at 6 0B
‘Attenuation bandwidth | $1.5KHzorlees at 20 08
+£2.2 kHz or less at 60 48
£3 ktHz or loss at 80 a8
Guaranteed attenuation
30 dB or more at a range within £1 MHZ
(The spurious output shall be at
18 48 or more.)
Terminal impedance 2KM+10%//1PF* 10%
Option
* BU-1 (Outside Battery Case)
Rt 1200
af
@
3
al
Tet
Sa
3
5
oat
is
|
Ms
3
|
\
uF
Lito
Fig.
26
BU-1
Circuit
Table
25.
BU-1
Parts
List
Part
Pants
No.
Remarks
Resistor
(R1)
RcosGr2Hi21s
|
120R+6%
1/2W
Power
Jack
J1)
E08
—
0304
—
05
Power
Plug
le30
~
1624
—
05
Battory
case
ls
19
—
1319
~
03
Dummy
eel
|wos
—
oo02
—
o5|
16
Ripple 2aBorless
[oss
6
4B
or
less
‘Guaranteed attenuation | 8048 or more within +1 MHe.
Impedance
‘GOORES%
//
18PFB%
for
both
input
and
output
In order to operate by DC
Since this unit is not equipped with OC power source cable,
in case of OC operation, it is necessary to prepare a DC
power source cable like the one shown in Fig. 25.
Since this cable is not equipped with a fuse, in case it is used
‘as that for TS-770. insert an 8A fuse.
DC power source cable and fuses are handled by our
business offices or service centers.
OC
cable
ASSY
parts
No.
X42-1210-00
Total Length 2 m(50 core 0.18 mm)
Fig. 25 DC Cable

OUTSIDE VIEWS
Push knob
FRONT
PANEL
(x2
eat
Kobltik21
0309
—14)
(K27 ~6404-04) sale
MeterlA)
SM
Dial
escutcheon
Panel
escutcheon
(B31
—0613—04)
(807—0612
—o5)}
(801-0617
~05)
Front
glass
LED
SEL—
103
be
0430-05)
(B10-“0814-05)
ares
(vi1=0480-08)
(831 ~0614~05) Knob{¢)x 3RIT FUNCTION
(k21 0279-14)
Lever knoblA) x4 (a)
(23-0707
04)
(k21~0308~14)
AF GAIN 3
Name
plate
i
Indicating
tube
(v4o~7760~86
Tovor
knob
SySTBY
Handle
(K23
0705
—04)
A
(k01
=
0402
~08)
Lo pr2ii20
(11-7260
~66
i
Push
knobiA)
{K27—0402 04)
Oramental
panel
»
Switch
gril
(a21
072203)
(807
0618-05)
4P Metal socket
(€08—0481
~
15)
072713)
LONER
Phone
jack
|
Tight
knob
if
(611-0034
96
|
(Brake)
Band
knobiA)
(844—
1404-08)
(k23-0714-04)
|
(k29~0710~05)
Knob(MODE)
LED
PRA1120,
Push
knob(8)
x
6
Bond
knob)
(k21
074204)
(v1
=7260-66)
(K27
0403
—04)
(K29=0711-05)
REAR
PANEL
Caso\B)upper
Heat
sink
C
KEY
jack
panel
(401-0729
01)
(E11
0005
~15
(a23~1426~02)
Speaker jack
(€11~0003—15)
Slide switch
(Backup)
(831-2027 ~08)
Blind
4P Power socket
(€08 0409-05)
Foots(Small x 419 15),
(4020022 ~08)
3 Case(A) Lower
. (A01 0728-01)
T FootiLarge) x 61420)
(02 —0049— 14)
Mtype
receptacle
ree
ie
hee
os
(€08—0751—05)
(13-0033
~15)
Power jack 3P Screw terminal
(08-0204 —05) (E21 0007-08)
7

INSIDE VIEWS
DIGITAL unit AF/VOX unit MIX (A) unit RF unit
(X54—1460—00) —.(x49—1120-61)_ (X48—1250—00) (x44—1270—00)
TOP VIEWS
MIX (B) unit
(x48 —1260—00/ ) ¥
a
g
aK
PLL(A) unit PLL(B) unit 430 MHz FINAL unit
(X50—1530—00) (x50—1540—00) (X56—1320—01)
BOTTOM VIEWS
Tone unit IF unit 144 MHz FINAL unit
(x52 —1110—62) (x48 — 1270-00) (X56-1310-01)
CAR unit
(X50—1510—00)
ENCODER
ASS'Y unit
(x60 — 1080-61)
PULSE generating unit
(X52-1220-61)
PULSE receiving unit
(x54-1400-00)
VCO unit AVR unit
(X50—1520—00) (x43—1310—00)
18