Kenwood KT-7020 Service Manual

KT-7020 | ~ KT-7020
ADJUSTMENT ADJUSTMENT
INPUT OUTPUT TUNER ALIGNMENT OUTPUT TUKER
TEM SETTINGS SETTINGS SETTINGS POIATS ALIGN FOR SETTINGS SETTINGS
Unless otherwise cpecified, the individual switches should be set as following:
(a) 98. 0MH2
ALIGHMENT
POINTS
ALIGN FOR
$8. OMEz
SELECTOR: L or &
kHz, £68. 25kHz dev
SELECTOR:Fi IF BAND:¥iDE RF SELECTOR:DISTANCE TUNING MODE:AUTO REC CAL: OFF
Connect a DC
PROGRAM: OPP
Wininua distortion.
BAND EDGE - voltmeter between | TUNING MODE: Pilot: 46. 75kHz dev
ie) TP3CV¥T) and TP4(GHD).| MARU 87. SWH2 80dBu(ANT input)
Connect a DC {C)
BAND EDGE ~ voltmeter between | TUNING MODE: TCL DISTORTIONCT) 98. OWHz
TP3CVT) and TPACGHD) MANU 108, OMHZ STEREO SELECTOR: L or R 98. OMHz ¥R2 : ;
Repeat alignaents 1 and 2 several tim NARROW 1kHz, £68. 25kHz dev (B) IP BAND: x88-) Mininua distortion.
th)
(E
&
T
types)
|
Pilot:46.75kHz
dev
NARROW
98. OM Connect a DC 80dBu(ANT input)
DISCRIMINATOR 0 dev voltmeter between 98, Oz 0.000Vti0a¥ Repeat the adjustuents from I0 to 15 a few tiaee to miniaize the distortion.
100dBuCANT input) {TPSCAFC)and TP6CYREF) | (c)
79) Connect 98. 0MH2
98. OMl2 a DC voltaeter SEPARATION SELECTOR: R vR4
PLL DETECTOR 0 dev between TPT(¥CC/2) 0. 000¥420a¥ a) 1kHz, #68. 25kHz dev (8) 98. OWBz (X05-) Minimua crosstalk.
100dBuCANT input) and TP8(DET). Ro-L Pilot: t6.75kHz dev
a) Connect | "esa input)
98. OMHz a frequency counter (c) |
0 dev between ms | 19. 000kHz+108z 98. O4RZ
1004BuCANT input) and TP20(¥CO). SEPARATION SELECTOR: L vRS
(a) Waxiaua aaplitude @ 1kHz, 268. 25kHz dev (B) 98. MHZ (x05-) Miniaua crosstalk.
RF ALIGNMENT 98. OMHz (BY 98. OMHz Lt.4,7,10 and cyametry Pilot: +6.75kHz dev
Iktiz, 475kH2z dev
x Repeat the sequence from LI--L4—-L?—--L10--L1+:- + --
[o) Maxiaua amplitude
iFTCL) 98, O¥Hz (B) 98. ONHZ Lit and syasetry
kHz, +75kHz dev (x05-) of the oscilloscope display,
(A) Maxiaum auplitude
8 IFT(2) 98. OWHz (B) 98. OMHz and syasetry
kHz, +75kHz dev of the oscilloscope display.
(A) Position where the STEREO
98. OMliz indicator lights
SELECTOR: MAIN - 98. OMRz when the control is
of the oscilloscope display.
80dBu(ANT input)
Repeat the adjustments of 16 and 17 a few times so that the B-to
AM SECTION Keep the All loop antenna installed.
SELECTOR: AM TUNING KODE:AUTO REC CAL:OFF PROGRAM: OFF
Connect a DC
voltmeter between
TP3CVT) and TP4CGRD)
Connect s DC
voltmeter between
TP3(¥T) and TPACGND).
Repeat alignments [1] and {2} several tines.
-L and L-to-R separations are equal.
530kHz
161 0kHz
9 AUTO-STOP
SENSITIVITY
lkHz,#75kW2 dev (X86-) rotated gradually clockwise (D) w Maxisua amplitude
J2dBuCANT input) from the sost. RF ALIGNMENT 630kHz (BD 630kH2 and symmetry
a
a)
400Hz,30%_
nod
(x05-)
of
the
oscilloscope
display
|
98. OMNZ (b>) & iz Maxinua amplitude
DISTORTION(1) | SELECTOR: MONO (8) 98. OWHz Miniaua distortion. RF ALICKMENT ] . 1440kH2 () 1440kHz Tez and syanetry
DET 1kHz, +75kHz dev > 400H2,30% aod of the oscilloscope display.
B0dBuCANT input)
ts [3] and [4] several tines.
(©) ®) ww Maximus anplitude
98. OMHz 999kH2 (B) 999kHz and syanetry
DISTORTION(2) SELECTOR: WONO (B) Winimus distortion. of the oscilloscope display.
400H2,30% od
@ L28 has been preset so the adjustaent is usually not required.
vr The peak will be easier to locate if the test loop antenna is used.
WON0 kHz, +75kHz dev *
80dBu (ANT input)
()
98. OMHz
SELECTOR: MONO
1kHz,+75kH2 dev %*
80dBu(ANT input)
Adjust 10, 11 and 12 alternately a few tines to ainiaize the MOKO distortion.
* EAT types: ikiz, t46kHz dev.
)
98. OMHz
SELECTOR: SUB
kHz, £68. 25kHz dey
Pilot:26.75kHz dev
S0dBu(ANT input)
©)
98. OMHz
SELECTOR: SUB
IkHz, t68.25kHz dev
Pilot:26.75kEz dev
8OdBuCANT iaput)
After the adjustment of 14,
DISTORTIONC3)
WONO
98. OMHz Minieum distortion.
DISTORTIONC4)
STEREO
(8) 98. OMEz Miniaum distortion,
DISTORTIONCS)
STEREO
Winieus distortion.
adjust 13 again to sinimize the distortion at 1kHz.
20 21

Kenwood KT-7020 Specifications

FM Tuner Section

tuning frequency range	87.5 MHz - 108 MHz
usable sensitivity (MONO)	0.95 µV/10.8 dB
total harmonic distortion (MONO)	0.007%
signal to noise ratio (MONO)	92 dB
stereo separation (1 kHz)	65 dB
capture ratio	1.0 dB (WIDE)
alternate channel selectivity (+400 kHz)	60 dB (WIDE)
image rejection ratio (at 98 MHz)	82 dB
IF rejection ratio (at 98 MHz)	110 dB
spurious rejection ratio (at 98 MHz)	105 dB
AM suppression ratio	76 dB
frequency response	20 Hz - 15 kHz, +0.5 dB, -0.5 dB
output level/impedance	0.6 V/3.3 kΩ

AM Tuner Section

tuning frequency range	531 kHz - 1, 602 kHz
usable sensitivity	10 µV (350 µV/m)
signal to noise ratio	55 dB
total harmonic distortion	0.25%
image rejection ratio (Loop)	40 dB
selectivity	30 dB
output level/impedance	0.18 V/3.3 kΩ

General

power consumption	20 W
dimensions (W x H x D)	440 mm x 98 mm x 318 mm
weight	4.3 kg