Kenwood T-76 User manual

FM/MW/LW
STEREO
SYNTHESIZER
TUNER
KENWOOD
T-76/76L
SERVICE MANUAL
©1992-7 PRINTED IN JAPAN
B51-4610-00(J)2385
Metallic cabinet
tAdl-}* Panel Knob
Front gl
. sachets {K29-4420-04)
“KENWOOD
Sub pane! : Foot
{A22-)* (J02-1040-05)
Cord with connector
{E30-2630-05}
ATTENEMI
Lock terminal board Phono jack i Rectangular receptacle Foot
{E20-}* (E13-0235-05) ” {608-0312-05} (J02-0370-065)
T-76 and T-76L don't have a power supply transformer.
| Use A-56,A-76 or RM-90PS power supply to supply power
|, if neither ts available,adjust to operate as instructed on
| page 8.
When turning the power on, short the connec-
tor pin of CN201 {XO5-B/2}. *Refer to parts List on page 25.
Photo is T-76L

T-76/76L
CONTENTS/ACCESSORIES
Contents .
CONTENTS/ACCESSORIES 2.0.0... ccc ec cece cece ee ee sere eee es 2 SCHEMATIC DIAGRAM (T-76} ....... eee 4 cGatntntia
BLOCK DIAGRAM..........0..5 Use aeedeaeu ere een saat iieatenk 3 SCHEMATIC DIAGRAM (T-76L) o.oo... cece ccc ee sees eee ees
CIRCUIT DESCRIPTION.,.........ccccccccteecsteees ree eeeeneeeeeens 4 EXPLODED: VIEW os sisds occkincsedevvciss cee sadsaseuteeses se coeertes
ADJUSTMENT wisceiscvcedcatde ct soseeiliteteies detec sane seein eden sce s 7 PARTS LIST) sechadacsastecncdargndetecccantess sLatsel Mmwabudies bean ees
PC BOARD (COMPONENT SIDE VIEW) .........0.. ee 9 SPECIFIGA PIONS 34. co cnarcess ieeseseedeenreansd seneeentes
WIRING DIAGRAM oo... cee cce cece cee ee ee eee eres cece peceen anes 41
JAPAN MADE SINGAPORE MADE | FRANCE MADE
X05-4320-20(M} X05-4330-20(M}
X05-4320-71(X) X05-4330-71 x}
X05-4322-71(T,E) X05-4332-71(T,E} X05-4322-72(E)
The T-76 and T-76L are made in different countries. However, their circuits are indentical.
Accessories
T TYPE ANTENNA
LOOP ANTENNA {T90-0176-05}: JAPAN MADE
{T90-0153-05): FRANCE MADE {T90-0176-05): FRANCE MADE
(T90-0175-05): SINGAPORE MADE
{ -
| GF ANTENNA ADAPTER
| (T90-0185-05):(T-76L ONLY)
LOOP ANTENNA .
{T90-0173-05): JAPAN MADE
(T90-0174-05): SINGAPORE MADE = _
ANTENNA HOLDER
(J19-2815-04}
|

T-76/76L
BLOCK DIAGRAM
AGL
OV
L
soc’z0¢
‘
pol~zolo
HOLISTIS
ANY,
-——-
4
C)]
Nv
wv}
QN9 WY;
INV
Wa:
|
19L-L
Jy'wy
Nee)
NOILSOSS
WY
pa
7
NOILO3S Wd
O}
Lnv
ul
ANY
Wa;
f)}
Inv
ws
i i
Si-L

T-76/76L
CIRCUIT DESCRIPTION
Blockdiagram of surrounding microprocessor {CXP50216-104S
BAND SELECT
THK oerere]
fH
We
IC201}
LNIW5Das
YZWVI dls
Lq3
ASB.
Walsas
vied
TOeLNGS
MS
LOWL
~-~
MS
30010
—-—
2220
40
€l2g0
bizd
aS

Pin functions
<9 T1, TO
CIRCUIT DESCRIPTION
T-76/78L
54 4 Voo
+5 V (Power supply)
1 9) G9, G10 FL grid output 9G, 10G
INT | No use (GND)
RST | RESET Reset input a
| 6 | apurs3—| vo BUSY System control BUSY input/output
iat #4 EC ] No use (GND) :
7 SCIPXO BIL BILINGUAL oe
8 SO/PX1 | | STEREO Stereo signal input He
9 SUPX2 | TUNED Tuning signal input Hypa ee
10~13 PFO ~PF3 ] KRO~KR3 | Key return input ees
14~17 PEO~PE3 O | _KSO~ks3 Key scan output oS
18 PYO oO. | No use (OPEN}
19 PwéiPyt | O | MONO Forced MONO output fee
20 werpy2 | CE AC OFF detection input He Ac OL
21 RuciPpy3 | DATAI System control DATA input
22 ppootstéd|=C DATAO System control DATA output
23~CO PD1 o | MUTE Line mute tS MUTE ON.
24 PD2 0 | MAIN No use
25 PD3 ie) i SUB No use
26~29 PCO- PC3 i KR4~KR7 ‘Key return input Pe
30 XTAL Quartz oscillator 4.194304iMHz
31 EXTAL Quartz oscillator 4.194304MHz
Vss GND pin
33 Veor
34 PHO/SO 9) POWER POWER ON/OFF control Hi OF
35 PH1/S1 0 ! DT/KS4 PLL DATA output Key scan output for destination SW
36 PH2IS2 o | cK PLL CLOCK output
37 PH3/S3 Oo PCE PLL CE output
38~55 | PGOIS4~S23/T8| O Sm~Sh FL segment outputim iipoawkijpnraahfg¢dec¢,h}
56~63 $22/T9~T2 | 0 G1~G8 FL grid output 1G~8G

T-76/76L
Test mode
{1} Method of setting
While pressing the DOWN key, turn AC ON.
(2) Contents
Power ON
FLL all jit
Test frequency setting (Table 1}
{3} Method of canceling
CIRCUIT DESCRIPTION
initiat status setting (reset)
{1} Method
While pressing the ENTER key, turn AC ON.
{2) Contents
The all memory is cleared and the initial status is fully re-
stored. At this time, however, test frequency is newly
memorized in the preset memory. {Table 1)
Clearing the FL all lit state is performed by numeral key,
BAND key, UP/DOWN key or POWER key.
Destination
T-76L
J TYPE
M, X TYPE
T, E TYPE
Otch
O02ch
83.5 MHz
98.0 MHz
98.0 MHz
90.0 MHz
108.0 MHz
O03ch
630 kHz
04ch
990 kHz
630-kHz
990 kHz
108.0 MHz
630 kHz
990 kHz
O05ch
1440 kHz
1440 kHz
1440 kHz
O6ch
1802 kHz
1602 kHz
1610 kHz)
1602 kHz
O7ch
87.5 MHz
162 kHz
O08ch
7 3 ch
8 ch
87.5 MHz
09ch
35 ch
216 kHz
87.5 MHz
270 kHz
10ch
89.1 MHz
89.1 MHz
89.1 MHz
ich 1 ch
87.5 MHz
281 kHz
12ch
13ch
3 ch
87.5 MHz
87.5 MHz
4ch
87.5 MHz
87.5 MHz
14ch
8 ch
87.5 MHz
87.5 MHz
—-15ch
12 ch__
87.5 MHz
87.5 MHz
t6ch
13 ch
87.5 MHz
87.5 MHz
1?ch 35 ch
87.5 MHz
87.5 MHz
18ch 62 ch
87.5 MHz
87.5 MHz
19ch
20ch ~ 30ch
Conditions by destination
Desti-
nation
76.0 MHz
87.5 MHz
76.0 MHz
es
; Band
BO
87.5 MHz
(Table 1}
Receiving frequency range
inter-channel
space
87.5 MHz
87.5 Mitz
intermediate | PLL reference |:
i frequency frequency
FM
76.0~90.0 MHz
100 kHz
AM
531~ 1602 kHz
9 kHz
+450 kHz
+
i
FM
AM
FM
AM
FM
AM
FM
1+ 62ch 6 MHz
87.5~ 108.0 MHz
631 ~ 1602 kHz
or 530~ 1610 kHz
87.5~ 108.0 MHz
530~ 1700 kHz
87.5~ 108.0 MHz
631 ~ 1602 kHz
87.5~ 108.0 MHz
531 ~ 1602 kHz
153~ 281 kilz
"100 kHz
or60 kHz
— 10.75 Me
+ 10.7 MHz | 5O kHz
9 kHz
or 10 kHz
100 kHz
tO KHz
80 kHz
9 kHz
50 kHz
9 kHz
7 10 kliz
+450 KHz
410.7 MH?
“+450 kHz
+ 10.7 MHz
1 kHz

T-76/76L.
ADJUSTMENT
INPUT OUTPUT TURER ALIGNMENT
ITEN
SETTINGS
SETTINGS
SETTINGS
POINTS
ALIGN
FOR
CA)
98. OWHz
lkliz, +75kilz dev Connect a BC voilmeter
DISCRIMINATOR CH,% type) between TPS and TP4,
tkHz, +40ki2 dev {X0§-)
(ET type)
5OdBu CANT input)
CA) Connect a frequency
98.
OMHz
eounter
to
TP5 and
AUTO
¥R2
19.
OOkHz
(b
)
0
dev
TPB
(GND),
98.
MHz
(X05-)
S0dBu
CANT
input)
(x05~-)
{)
98, OHHz
ikilz, £88. 25kltz dev
Pitot; £7. 5kHz dev
CHX type)
LkHz,240kHz dey
Pitot: t6kHz dev
C£,T type)
60dBe CANT input)
(€}
98. OMH2
DISTORT IOR
CB) MOND IPT Wininus distortion
CSTEREQ}
98. MHz (102-)
SEPARATION
[kHz.#40kKz
dev
(B}
AUTO
VR4
Kiniaua
crosstalk
CE,T
type
Pilot
t6kHz
dey
$8,
OKHz
(X05~)
only)
Selector:L
or R
BOdBu CANT input)
L4dBuCART input) 75
L8dBuC ANT input) 300a
AM CMW) SECTION SELECTOR : AMCHYD
CD}
1008kiz
400Hz, 30% mod
26dBuCANT input)
g CA)
93, OMHz AYTO ¥R1 Adjust ¥RL
kHz,
t75kHz
dev
(8)
or
MOKO
(405-)
and
stop
at
the
point
TUNING
LEVEL
CH.X
type)
98,
OMHz
.
where
ED({TUNED)
goes
on,
ikHz.t45kllz dev
(E,T type)
C1)
}
TUNING
LEVEL
(B)
1008kKz
¥R3
Adjust
¥R3
and.
stop
at
the point where EDLCTUNED)
ROes on.

T-76/76L
ADJUSTMENT
The T-76 and T-76L don't have a power transformer.Use
A-56/76 or RM-SOPS to supply power to the T-76/76L. If
neither is available,apply AC 16 V to TP12 andTP13 of
the tuner unit (X05, A/2),
When turning the power on, short the connector pin
of CN 201 (X05-B/2}.
(XO5)(A/2}
c3i2
\\
Dummy antenns
Antenna fictive -
tayfas
[rw-se
fT
|
aN:
(C)
as
[~]
FM-MPX
|
FM-ss
|
MS
|
(B)
AC vottmeter Oscilloscope
(BD) — am-s¢ Voltmeétre CA Oscilloscape bs otek
; Klirrfaktomasser Oszilloskop Distortion meter
Distortionmétre
Wechseispannungsmesser

A JE: C Hee ee E EEE Se G Ra ee | pee ig er ake te >
PC BOARD (Component side view)
POWER ON
When turning the power on,
short the connector pin of
CN201.
SYSTEM DE -EMPHASIS ANTENNA
CONTROL CH~ SPACE
(b) VCO : 19.00KHz
Frequency counter
(a) Discriminator : 0V
ogc aod
DC voltmeter
9 Refer to the schematic diagram for the values of resistors and capacitors. 10

E SS G Ss Re Lr es T-76/76L.
WIRING DIAGRAM
POWER ON
zi Z i
. ian} ~ @
When
turning
the
power
on,
i
=
;
short the connector pin of C °
CN201. = 5
wu cs a ; rf
iB = = =
Og ud a. k
oO DP ee i e = t
Fats “i |
w oa
1
2 3
4
ACLSY ACIGV
' a
DOE-EMPHASIS CH.SPACE
- ANTENNA
WHI
type
type
ANTENNA
MX
T.€
‘
t
4
t
‘
‘
‘
'
‘
'
‘
‘
4
'
'
'
t
,
t
L
X05
AS2
WHI
(b) VCO : 19.00kHz
2 eel
ao
goce
on
a eae ae aa a cn Sa ew rts Te Saab te
Frequency counter
(a) Discriminator : OV
= :
LS) “ i :
Oop aeao 0 x S i
= = i]
DC voltmeter 1 = :
wow {
aa
' > ae ta) ;
9 Refer to the schematic diagram for the values of resistors and capacitors. bs 10 11