Kenwood T-93 User manual

FM/AM STEREO SYNTHESIZER TUNER
T-93/93L
KENWOOD
SERVICE MANUAL
(©1989-8 PRINTED IN JAPAN
B51-3958-00(T) 1702
Metallic cabinet
(AQ1-)* Panel
(A20-)*
Front glass
Foot (Front)
(B10-1033-03)
(JO2-1040-05) x 2
Power cord bushing
(J42-0083-05)
Miniature phone jack
(SYSTEM CONTROL)
(E11-0188-05)
Phono jack (OUTPUT)
(E13-0249-05)
CAUTION.
ATTENTION
KENWOOD CORPORATION
BOOK MAE 2S JAPAN
Foot
(Rear)
pa
a
a
cord
(JO2-0366-15)
x
2
Lock terminal board (ANTENNA)
(E20-)*
* Refer to Parts List on page 44.
Photo is T-93L
POWER
TRANSFORMER (L01) PHONT END NEC!
MODEL NAME TUNER UNIT (X05) DISPLAY UNIT (X14)
T-93 (J)
X05-3780-20
X14-2620-21
LO1-5454-15
X86-1040-10
T-93 (J)
X05-3780-71
X14-2620-71
LO1-65452-05
X86-1040-10
T-93L (J)
X05-3782-71
X14-2622-71
LO1-5452-05
X86-1052-70
T-93L (J)
X05-3782-72
X14-2622-72
LO1-5452-05
X86-1052-70
T-93 (S)
X05-3780-21
X14-2630-20
LO1-9004-05
X86-1130-10
T-93 (S)
X05-3780-72
X14-2630-71
LO1-9002-05
X86-1130-10
T-93L (S)
X05-3782-73
X14-2632-71
LO1-9002-05
X86-1122-70

T-93/93L
CONTENTS
CONTROLS AND INDICATORS.............. 0.0.0: 0c:eeeeeeee ees 3 REGLAGES se isices adie td cocat acdecsatoncaea teat Seoegute cake odebiate 16
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CIRCUIT DESCRIPTION 0.00.0... c cece cece ec ea eee enenennens 7 P@BOARD:(T-98E) cca teecacn ies gavePeaivns ontlaasietdies adosaw 27
Operation specification............0.c cece cece cee e eee s eee eneees 7 SCHEMATIC DIAGRAM (1-93) .......0 cc ccee cece eee ee eee n eee 35
IC1: CXP50112-0100 (X14-) SCHEMATIC DIAGRAM (T-931L)..........cccc ccc ec eee e eee ee eens 39
MICROPROCESSOR ..............cccescceee nsec eeeeeenes 8 EXPLODED: VIEW waitin, cocndeates ber daiwisiewes teak caves die mae ee 43
IC1: LM7001 (X05-378X-XxX) PARTS 1S Vessco Sia seetoule tacts atheist aan cuban deta tea 44
PLL. CONTROL DATA s. eccccih ted ive aie neces 12 SPECIFICATIONS. jscsei sa vaneeeatele io ievniy aoncanee Back cover
ADJUSTMENT wicicciised.besloaaseas sda teeecisades Saakace 15

T-93/93L
CONTROLS AND INDICATORS
Tuner
Numeric keys (1 to 10/0, Preset channels, program Nos.) BAND key
(T-93: FM1, FM2, AM/
CHECK key T-93L: FM1, FM2, MW, LW)
CLEAR key TUNING/CHARACTER
UP/DOWN keys
ENTER key
(OOD) Fam sTerReo SYNTHESIZER TUNER T-93 a
DOWN TUNING/CHARACTER UP
TSUN
Z/MON it SWED FRU procram = {i} Oo a AUTO STEREO TUNED.
—| —— — oT FM MW LW
AY Wi. Ma NA Pb te Ce we PT
wt IAI aN la ! Pie CF OF kee fF Eten
(SON) (ON) TUE) eo) Feo} [exxa] SLEEP gE
G/FRI JISAT a 9 10/0
CoICICICICI
EVERY WEEK 1 _ WEEK 2
ADJUST SLEEP EXE. PROG. _OISPLAY DIRECT P.SCAN AUTO DIGIT CHARACTER
oa ee ed ee
DISPLAY key DIRECT key
PROG. key P.SCAN key
EXE. key AUTO key (Auto tuning/manual tuning)
SLEEP key DIGIT key
ADJUST key CHARACTER key
Display panel
BAND indicators
(T-93:
FM,
AM/T-93L:
FM,
MW,
LW)
AUTO
indicator
STEREO indicator
PROGRAM indicators ( [1] to [6])
TUNED indicator
Year/Station name display
AUTO STEREO TUNED
~
CI Cl
ma
1
te
LI
Lt
kez
§
Ltr
SLEEP MEMORY
Preset channel
Day-of-the-week
indicators
display
MEMORY
Month/Day/Present
time/Frequency
display
pina
indicator
SLEEP timer
indicator

T-93/93L
ANTENNA CONNECTION
Antenna connections
FM outdoor antenna
T-93
AM loop
antenna
ANTENNA
LOOP ANTENNA
BAM (MW, LW) loop antenna
Install the AM (MW, LW) loop antenna on the supplied loop
antenna stand and place it on a shelf, etc., or install it on the
rack or wall with screws.
Rotate the AM (MW, LW} loop antenna to the right or left for
best reception.
Ge
Keep the speaker
leads and AC cords
away from the AM
loop antenna.
Note: : ae
Do not place the AM (MW, LW) loop antenna on the unit. As this
unit employs a computing device, placing the AM (MW, LW) loop
antenna on the unit may result in noise generation. Place the AM
(MW, LW) loop antenna away from the unit.
@ AM (MW, LW) outdoor antenna
In steel buildings or at a great distance from the transmitter,
it may be necessary to install an outside longwire antenna.
The end of this wire should be stripped of insulation and con-
nected to the AM terminal. At this time, keep the loop anten-
na connected.
AM (MW/LW) outdoor antenna
\--O§
FM indoor antenna
|
ea T-93L
Antenna adaptor
HFM outdoor antenna
It is recommended to install an exclusive FM outdoor antenna
to capture FM broadcasts with high sound quality.
Use a coaxial cable for the connection between the outdoor
antenna and FM ANTENNA terminal on the rear panel. For the
connection between the coaxial cable and FM ANTENNA ter-
minal, please refer to the illustration above.
@ FM indoor antenna
In areas where FM waves are strong, FM broadcasts can be
received by connecting the supplied T-shaped antenna as
shown in the illustration above. However, as FM waves are
susceptible to external radio interference causing distortion,
it is recommended to use an exclusive FM outdoor antenna.
® To minimize auto-ignition noise, locate the antenna
i as far from heavy traffic as possible.
| @ Keep the feeder or coaxial cable as short as possible.
Do not bundle or roll up excess cable.
@ The antenna should be at least two meters (6.6 feet)
from reinforced concrete walls, or metal structures.
FM outdoor antenna setting

T-93/93L
BLOCK DIAGRAM
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T-93/93L
FUNCTION OF EACH IC's
TUNER UNIT (X05-378X-XX)
Components Use/Function
Operation/Condition/Compatibility
LM7001 PLL IC
Electronic tuning PLL
LA1265 FM/AM system IC
FM IF amplification, detection, and AM MIX, IF amplification,
detection, control
AN7470 FM MPX IC
MPX demodulation
Q1 28C1923 FM IF amplifier
10.7 MHz amplification
Q2 2SC1740S E:P.E.
PLL low-pass filter JC501/2SC945(A)
Q3 2801845 L.P.F.
PLL low-pass filter
Q4 (T-93L) 2SK163 L.P.F. switch
Time constant selection for LW mode 2SK364
Q6 (T-93L) 2SC1740S L.P.F. control
I Control! over 04. LW position with switch ON JC501/2SC945(A)
Q7 (T-93L) 28C1740S
Q8 (T-93L) 2SC1740S
Antenna coil selection
LW/MW electronic selectionz JC501/2SC945(A)
Q11 (T-93L) 28C1740S Buffer
Impedance change JC501/2SC945(A)
Q13 [| 2SA733(A)
Q24 2SA733(A)
Q25 2SA733(A)
Tuner band selection
FM/MW/LW power selection JA101/2SA933S
Q15 2SA733(A) Mute control
Q16 2S8C2003
Q17 2$D1302
2801302
Constant voltage
Mute switch
Mute ON with signal ‘’L’’ from microprocessor 2SA933S
+5.6 V regulated
ON in function selection
Q19 {T-93) 28C1740S
Q20 (T-93) 28C1740S
Q21 2SD1266
Q22 2SA733(A)
023 28C1740S
Deemphasis selection
Constant voltage
Power switch
Control
DISPLAY UNIT (X14-262X-XX) JAPAN MADE
(X14-263X-XX) SINGAPORE MADE
Components Use/Function
Deemphasis time constant selection for FM mode 2SC945(A)
+13 V regulated
Power ON/OFF operation 2SA933S/JA101
Power ON with signal ‘‘H’’ from microprocessor JC501/2SC945(A)
Operation/Condition/Compatibility
CXP50112-0100 4-bit microprocessor
Controller for PLL and display, etc.
2SC1740S FIP Driver
FIP Indication (STEREO, TUNED, ch etc.) JC501/2SC945(A)
28C1740S FIP Driver
FIP Indication (FM, AM, etc.) JC501/2SC945(A)
2SA733(A) Tr. SW
CHANNEL SPACE select 2SA933S
2SA733(A) Constant voltage
For +5 V JA101/2SA933S
2SC1740S Microprocessor Reset
Suplies reset pulse to microprocessor JC501/2SC945{(A)

T-93/93L
CIRCUIT DESCRIPTION
OPERATION SPECIFICATION
Functions
(1) Tuner section
a)
b
=
—
c
d
=>
~~
e
f)
Auto tuning
When the “AUTO” display is lighting, the tuning operation
starts with the UP or DOWN key pressed. This operation
continues in the direction of increasing or decreasing fre-
quency at arate of approx. 125 msec/step until the SD ter-
minal becomes ‘‘L"’ (in which ‘‘ TUNED” lights). When an
input is obtained, the operation is stopped, after which,
0.5 sec later, muting is turned OFF.
Manual tuning
When the AUTO” display is off, when the UP or DOWN
key is pressed, the tuning operation goes in the direction
of increasing or decreasing frequency at a rate of one step
per key pressure.
When the UP or DOWN key is pressed continuously for more
than 0.5 sec, the tuning operation continues in the direc-
tion of increasing or decreasing direction at a rate of
125 msec/step irrespective of the SD terminal level until the
key is released from the finger pressure.
Direct tuning
The frequency whose data has been directly input from
numeral keys is received. About how to input the frequen-
cy data, press the DIRECT key, then input the frequency
value from numeral keys.
When the input frequency is within the specified band, this
frequency is received soon after the input of its final digit,
While when it is without the specified band, an error dis-
play appears for 5 seconds, after that the original display
is restored,
Preset memory
For each band, 10 stations can be preset. Their station
names, each consisting of up to 4 characters, can all be
memorized at the same time.
Only the FM mode permits memory of 10 more stations.
In this case, however, their station names cannot be input.
Preset scan
This function is to receive the preset stations successively.
With a tuning signal, muting is turned OFF for 5 seconds,
while with no tuning signal, the tuning operation shifts to
the next station after 1 second.
Station name display
For a preset memory, up to 4 characters can be input for
a station name. When the wanted one is called from the
preset memory, that station name is displayed. Inputtable
characters are alphanumerics A to Z and 0 to 9, and 6 spe-
cial characters including ‘’—‘’ (blank). In addition, FM2 does
not permit input.
(2) Timer section
a) Day timer
A timer function with the unit count of 7.8125 msec is
provided. The time value is displayed in the 24-hour mode
without flickering of the colon ‘’:’’ after which the second
data is displayed.
At first, when AC is applied, the display is initialized to
“0:00”.
When the power fails, all digits inclusive of the colon flick-
er to warn for readjustment.
b) Calendar
An auto calendar function of from January 1, 1900 to De-
cember 31, 2099 is provided. With year, month and day
data is input, day-of-week setting is automatically made.
When initialized, January 1 (Sunday)/1989 is engaged.
c) Calendar check
When year, month and day data is input, it is possible to
know what day of the week that day is.
The inputtable range of data is the same as that for the
calendar function.
d) Programmable timer
Six timer systems are provided to set the day of week, ON
time, OFF time, band and preset channel, independently.
As to the day of week, selection is possible from 10 pat-
terns such as each day of week of Sunday to Saturday, ev-
ery day, Monday to Saturday, and Monday to Friday.
e) Sleep timer
The sleep timer is an auto OFF timer of max. 90 minutes,
which is capable of setting in units of 10 minutes. During
the sleep timer operation, the ‘‘SLEEP”’ display is lighting.
This timer is given priority over the programmable timer.
The sleep timer is operable even when the day timer is not
set.

T-93/93L
IC1: CXP50112-0100 (X14-)
4-bit MICROPROCESSOR
Pin Connections (Top View)
KS4
SURROUND
SUPER WOFF
CENTER SP
p
fe)
1G
2G
3G
4G
$4/PGO
S5/PG1
$6/PG2
$7/PG3
S8/PKO
S$9/PK1
S10/PK2
S11/PK3
$12/PJO
$13/PJ1
$14/PJ2
$15/PJ3
$16/T15
$17/T14
$18/T13
$19/T12
$20/T11
S$21/T10
$22/T9
S$23/T8
17
T6
T5
T4
CIRCUIT DESCRIPTION
QVO@OOD-OOOOOOOOMOOOOOMOO)
S3/PH3 KS3
OOBYO
el
OG
S2/PH2 KS2
S1/PH1
59
KS1
bal
OL
SO/PHO KSO
08
CNS
(N3d0) ON
XL
XSL
GND
LaSay
aay
ag
O0V/Old
SLAWL
9SWAD Id
KR6 KR5
PC2
LOV/LId
cav/eld
101d
KR4 KR3 KR2
PCO
@) @)
8)
€qv/eld
NIVN vaQVv/08d
Ls qd
PD2
ans sdav/lad
Note: The NC pins
PD1
PDO
PY3/RMC
PY2/WP
PY1/PWM
PYO
PE3
PE2
PE1
PEO
PF3
PF2
PFI
PFO
PA3
PA2
PAI
PAO
PX2/SI
PX1/SO
PXx0/SC
EC
PB3/AD7
PB2/AD6
KRI1
KRO
RREEMOCON
CE
FVLED
RVLED
FVUP
FVDW
RVUP
RVDW
GE
FPOWER/EXRS
A MUTE
SDT/KS5
SCK
SST
DATA
BUSY
BILINGUAL
STEREO
SD
GND
E-XST
MONO
pins 33
and 73, shod be set
to VDD.

T-93/93L
CIRCUIT DESCRIPTION
Pin Functions:
Name Operation description
6
Pin name
S4/PGO
S5/PG1
$6/PG2
$7/PG3
$8/PKO
S9/PK1
$10/PK2
$11/PK3
$12/PJO
$13/PJ1
$14/PJ2
$15/PJ3
S16/T15
$17/T14
$18/T13
$19/T12
$20/T11
$21/T16
$22/T9
$23/T8
KS4 Key scan output
SURROUND SURROUND ON/OFF
SUPER WOFFER | SUPER WOFFER ON/OFF
CENTER CENTER OUTPUT ON/OFF
S8 FL segment output
S9 FL segment output
FL segment output
FL segment output
O!OI NIA! ASA! WihM
FL segment output
FL segment output
FL segment output
FL segment output
FL segment output
FL segment output
FL segment output
FL segment output
FL segment output
FL segment output
FL segment output
FL segment output
T7 FL grid output
T6 FL grid output
TS FL grid output
T4 FL grid output
T3 FL grid output
T2 FL grid output
det FL grid output
OLOSOLOSLOLOlOLlOlLOSlOlOlLOlLOlLO;LOLOJSOJSOlLOLOS/O!LIOsS/IOlL|OjJO;O};oO/];o
cHlcziczjozira|cz|[czjrz|czpez[os|razjoz|ozjoziraz|es|ea|cs|eaziczjoziczjoziczjoszica[os
TO FL grid output
External interrupt pin... unused ;
TX Timer oscillation pin... unused
TEX Timer oscillation pin... unused
RESET
Reset
input
i
Noe
NC
Power supply pin
TMUTE Tuner section mute output : vie a
PLCK/KS6 Clock to PLL and extension IC, and key scan (for diode SW)
PLDT Data output to PLL and extension IC
PLST PLL chip enable output
PMAIN TV sound multiplex selection output
PIO/ADO
PIT/AD1
PI2/AD2
PI3/AD3
PBO/AD4
PB1/ADS
PB2/AD6
PB3/AD7
PSUB TV sound multiplex selection output
PMONO Stereo/mono selection pier
O}OJ;/O}/O};O}]O};O]/O
EXIO Extension IC strobe signal
EC EC Even counter input... unused
Be a es ty HN eB tee
PXO/SC | SD Tuning signal input ed
: Mono
PX1/SO ST Stereo signal input ° Stereo
a a

T-93/93L
CIRCUIT DESCRIPTION
Pin name Name Operation description
H: Normal
++ ——
PX2/S| BIL Bilingual signal input L: Bilingual
PAO BUSY System control busy
PA1 DATA System control data
PA2
PA3
PFO
PF1
PF2
PF3
PEO
PE1
PE2
PE3
ISST Input selector IC strobe output
ISCK Input selector IC clock output
ISDT/KS5 Input selector IC data/key scan
AMUTE Amplifier section mute output a prec
POWER/EXRS
Power
control/extension
IC
reset
output
ie
oft
Nees
ON}
. “ . H: Graphic equalizer ON
GE Graphic equalizer display output L: Graphic equalizer OFF
RVDW Rear volume down He Down
RVUP Rear volume up i Up
FVDW Master volume down i Bow
H: Up
L:—
al
FVUP Master volume up
L.
>
OFF
PYO RVLED Rear volume LED ON
PY1/PWM FVLED Master volume LED uote
mae Ua
: ON
PY2/WP CE AC ON/OFF detection input OFF
OJOJOLOLO;L/O;SOLOLO/]O/S]OlO
PY3/RMC ; RMCN Remote control input
: With input
; Without input
: With input
: Without input
: With input
Without input
With input
Without input
+ With input
Without input
With input
: Without input
: With input
: Without input
: With input
: Without input
PDO KRO Key return input
KR1 Key return input
KR2 Key return input
KR3 Key return input
KR4 Key return input
KR5 Key return input
KR6 Key return input
THCLIHLTOHLTiCTi-“LTiCLTic_co
Key return input
GND pin
Oscillator pin
NC
EXTAL Oscillator pin
VREF Voltage detection reset pin... unused
VFDP FL pin pull-down resistor power
SO/PHO Key scan output
S1/PH1 Key scan output
S2/PH2 Key scan output
ee ee
S3/PH3 Key scan output