Kenwood VT-183 User manual

HANDLE : (K01-0564-08)
HANDLE COVER : (B09-0410-08)
FRONT PANEL
(A63-0302-08)
SIDE FRAME
(A13-2254-08)
PUSH KNOB
(K24-3015-08) KNOB
(K21-0961-08)
PUSH KNOB
(S68-0660-08)
RUBBER FOOT
(J02-0543-08)
AUTOMATIC AC VOLTMETER
VT-183
SERVICE MANUAL KENWOOD TMI CORPORATION
© 1998-5/B51-1133-00 (K/K)
VT-183(K)internet98.6.89:34AM y[W 2

VT-183
2
The following instructions are for use by qualified personnel only. To avoid electric shock,
do not perform any servicing other than contained in the operating instructions unless you
are qualified to do so.
WARNING
CONTENTS
SPECIFICATIONS..........................................................................................................3
SAFETY..........................................................................................................................4
CIRCUIT DESCRIPTION................................................................................................5
BLOCK DIAGRAM..........................................................................................................7
ADJUSTMENT................................................................................................................8
PARTS LIST (UNIT)......................................................................................................10
PARTS LIST (ELECTRICAL)........................................................................................11
SCHEMATIC DIAGRAM...............................................................................................14
P.C. BOARD .................................................................................................................18
VT-183(K)internet98.6.89:34AM y[W 3

VT-183
3
SPECIFICATIONS
Measure voltages
dB
dBm
Error
Frequency response
Input impedance
Max. input voltage
Stability
Residual Voltage
Meter Section 1mV to 300mV in 12 ranges :
1, 3, 10, 30, 100, 300mV, 1, 3, 10, 30, 100, 300V full scale
–80 to +50dB (0dB=1V)
–80 to +52dBm (0dBm=1mW at 600Ω)
Within ±3% of full scale at 1kHz
±10% at 5Hz to 1MHz,
±3% at 20Hz to 200kHz and
±2% at 30Hz to 100kHz as
reference to 1kHz response.
10MΩ+5% with less than 50pF parallel capacitance.
500V (DC +AC peak) 1V to 300V range
100V (DC +AC peak) 1mV to 300mV range
Within 0.5% of full scale for 10% line voltage fluctuation.
Less than 20µV with input shorted on 1mV range
Output Voltage
Output resistance
Frequency response
Distortion
Signal to noise ratio
1Vrms (full scale) ±20%
600Ω±20% at 1kHz
Within ±3dB at 10Hz to 500kHz
Less than 1% at full scale
(Rated by signal-noise ratio in 1mV and 1V ranges. )
Over 40dB at full scale
Output voltage
Offset voltage
Output resistance
Frequency response
DC output Amplifier Section 1V ±20% +offset voltage at full scale
±100mV
Less than 10mVrms
Within ±3% at 10Hz to 1MHz
Coefficient
Temperature
Relative humidity
Environmental ±0.08%/˚C
Within specification : 10 to 40˚C
Full operation : 0 to 50˚C
Less than 80%
128 (128) x 190 (210) x 239 (268)
Value in ( ) include protrusions
Line voltage
Power consumption 100/120/220/230 Vac ±10% 50/60Hz Max. 7.5W
Dimensions
WxHxD (mm)
Net Weight 3kg
Power cable
Input cable
Replacement fuse
Instruction manual
Adjust driver
Accessories
Power Supply Section
1 pc.
CA-41 1pc.
1 pc.
1 copy
1 pc.
Amplifier Section
VT-183(K)internet98.6.89:37AM y[W 6

VT-183
4
SAFETY
Before connecting the instrument to a power source, care-
fully read the following information, then verify that the
proper power cord is used and the proper line fuse is
installed for power source. The specified voltage is shown
on the rear panel. If the power cord is not applied for
specified voltage, there is always a certain amount of dan-
ger of electric shock.
Line voltage
This instrument operates using ac-power input voltages
that 100/120/220/230 V at frequencies from 50 Hz to
60Hz.
Power cord
The ground wire of the 3-wire AC power plug places the
chassis and housing of the instrument at earth ground. Do
not attempt to defeat the ground wire connection or float
the instrument ; to do so may pose a great safety hazard.
The appropriate power cord is supplied as an option that
is specified when the instrument is ordered.
The optional power cords are shown as follows in Fig.1
Line fuse
The fuse holder is located on the rear panel and contains
the line fuse. Verify that the proper fuse is installed by
replacing the line fuse.
Voltage conversion
This instrument can be operated from 100 to 230V,
50/60Hz power source.
Use the following procedure to change from 100 to 230V
operation or vice versa.
1. Remove the fuse holder.
2. Replace fuse F1 with a fuse of appropriate value.
3. Reinsert it for appropriate voltage range.
4. When performing the reinsertion of fuse holder for the
voltage conversion, the appropriate power cord should
be used. (See fig.1)
SAFETY
North American
120 volt/60 Hz
Rated 15 amp
(12 amp max ; NEC)
Universal Europe
230 volt/50 Hz
Rated 16 amp
U.K.
230 volt/50 Hz
Rated 5 amp
Australian
240 volt/50 Hz
Rated 10 amp
North American
240 volt/60 Hz
Rated 15 amp
(12 amp max ; NEC)
Switzerland
230 volt/50Hz
Rated 10 amp
Fig.1 Power Input Voltage Configuration
Plug configuration power cord and plug type Factory installed
instrument fuse
0.2A, 250V
slow blow
5x20mm
0.1A, 250V
slow blow
5x20 mm
0.1A, 250V
slow blow
5x20 mm
0.1A, 250V
slow blow
5x20 mm
0.2A, 250V
slow blow
5x20mm
0.3A, 250V
slow blow
5x20 mm
Line cord
plug fuse
None
None
None
Parts No. for
power cord
E30-1982-08
E30-1985-08
E30-1986-08
None
5A
Type C
None –
–
E30-1983-08
VT-183(K)internet98.6.89:37AM y[W 7

General
This AC voltmeter is combined with Meter unit and Control
unit. Meter unit switch to different range according to the
remote control signal and display the result to the meter.
Control unit will output the remote control signal according to
the output of the Meter unit.
Description of Functional Circuits
Meter Unit
1) First Attenuator
It is the attenuator based on the resistance dividing method,
and its two-staged attenuation volume-one is 0dB(the range
between 10µV and 300mV),and the other is –60dB is con-
verted by a relay.
2) Impedance Conversion Circuit
It is the circuit to convert the signals from the first-stage
attenuator into a fully low impedance in order to send it to
the second-stage attenuator (1mV–300V) .
3) Second Attenuator
A resistance divider act as a attenuator. The amount of
attenuation is switch in two steps by relay contacts:0dB and
–30dB.
4) Third Attenuator
A resistance divider network acts as an attenuator. The
amount of attenuation is switched in four steps by a FET
switch:0dB, –10dB, –20dB and –30dB.
5) Main Amplifier
A wideband, non-inverting differential amplifier acts as a
main amplifier, which has high input impedance, Iow output
impedance and 20-fold gain. This output signal level is
20mVrms for the full scale read on the Meter .
6) Output Amplifier
A widehand, non-inverting differential amplifier acts as an
output amplifier, which has 50-fold gain and 600Ωoutput
impedance. The output signal level is 1Vrms for full-scale
read on the Meter, and works stable even for cpacitive
loads.
7) Absolute-Mean Valve Detector
An absolute-mean value detector comprised of a high
through-rate and high gain amplifier. Which has a very good
linearity by negative feedback from the current flowing
through the Meter load. In switching, this provides a suffi-
ciently wide frequency band so that the high frequency
phase compensation circuit is reset.
8) Attenuator Control
A logic control circuit comprised of a diode matrix and output
buffer transistors. This encodes a 12-bit signal from the
Decoder on the control board to a 6-bit signals, which con-
trol the First, Second and Third Attenuators. The remote
control connector is connected to this circuit.
9) Power Supply
The power source circuit supply ±5V DC from the AC input,
which contain a silicon diode bridge for full-wave rectifica-
tion, high-capacitance electrolytic capacitors for smoothing,
and an IC regulator stabilization.
Control Unit
1) Pre-Amplifier
A wideband, non-inverting differential amplifier act as a pre-
amplifier. Which has 50-fold gain and the purpose is to
buffer the signal from meter unit and then driving the two
rectifier circuit.
2) Rectifier
Two transistors to from a full wave rectifier.
3) DC Output Circuit
A non-inverting operational amplifier act as a DC output dri-
ver with 1V full scale voltage. The output impedance is
600Ω.
4) Peak Hold Regulation Circuit
Two transistors to from a full wave rectifier, and the peak
voltage is held by a smoothing capacitor.
5) Discharge Circuit
The peak voltage mention above will be discharge by a tran-
sistor frequently with a constant period.
VT-183
5
CIRCUIT DESCRIPTION
In studying the operation of each circuit in voltmeter please refer to "BLOCK DIAGRAM".
VT-183(K)internet98.6.89:37AM y[W 10

VT-183
6
CIRCUIT DESCRIPTION
6) Differentiator
The oscillator output will pass through a RC differentiator
and then active the discharge circuit.
7) Up Comparator
The Up comparator will output a Up pulse when the output
of the peak hold regulation circuit is higher than the high ref-
erence voltage.
8) Down Comparator
The Down comparator will output a Down pulse when the
output of the peak hold regulation circuit is higher than the
low reference voltage.
9) Oscillator
The oscillator will generate a pulse for each 60msec, and
the pulse is use for the discharge circuit and the both
Up/Down comparator.
10) Up/Down Counter
The pulse from the UP/Down pulse control gate circuit will
trigger the Up/Down counter, and which output design the
attenuation range of the meter board.
11) Decoder
This decoder convert the 4-bit binary code from the
Up/Down counter to a 12-bit control signal which drive the
attenuator control on the meter board.
12) Up/Down Pulse Control Gate Circuit
The Up/Down pulse output from this circuit is depended on
the Mode switch. Under Hold mode, the output pulse are
generate from the Up/Down switch. On the other hand,
when under Auto mode, the output pulse are generate from
the Up/Down comparator and the Up/Down can over right
the Up/Down comparator.
VT-183(K)internet98.6.89:37AM y[W 11

OUTPUT-1
INPUT
RELATIVE REF.
METER
OUTPUT
AMP
ABSOLUTE
MEAN
VALUE DET
AC 100V/120V/220V/230V
50/60Hz
ATT
CONTROL
PRE AMP
POWER
SUPPLY
INPUT BD.
MAIN AMP
3rd ATT
2nd ATT
IMPEDANCE
CONVERTER
1st ATT
POWER
TRANSFORMER ON/OFF
POWER
DC±5V
PEAK HOLD
REGULATOR
RECTIFIER
OUTPUT
CIRCUIT DIFFERENTIATOR
DOWN
COMPARATOR
OSCILLATOR
UP/DOWN
COUNTER DECODER
UP
COMPARATOR
UP/DOWN
PULSE CONTROL
GATE CIRCUIT
DC±5V
DISCHANGE
CIRCUIT
UP SW
DOWN SW
MODE SW
RANGE
DISPLAY
CONTROL BD
DC OUTPUT
REMATE
INPUT
VT-183
7
ADJUSTMENT
VT-183(K)internet98.6.89:38AM y[W 14

300mV range VR102
(Unless otherwise specified, the above connection should be used as to the follow-
ing items.)
RANGE: 300 mV
1) Input 1 kHz (or 400 Hz), 300 mVrms sine wave, and set the pointer to 3.0 of the
0-3 scale. Check that the variable range is less than 98% and more than 102%
with respect to 3.0 (full-scale).
2) Waveforms shown on the oscilloscope shall not be deformed.
To obtain the best performance, periodically calibrate the
unit. Sometimes, only one mode need to be calibrated, while
at other times, all modes should be calibrated. When one
mode is calibrated, it must be noted that the other modes
may be affected. When calibrating all modes, perform the
calibration in the specified sequence.
The following calibration requires an accurate measuring
instrument and an insulated adjusting flat blade screwdriver.
If they are not available, contact your dealer. For optimum
adjustment, turn the power on and warm up the scope suffi-
ciently (more than 30 minutes) before starting.
Before calibrating the unit, check the power supply voltage.
TEST EQUIPMENT REQUIRED
The following instrument or their equivalent should be used
for making adjustment.
PREPARATION FOR ADJUSTMENT
Control Settings
The control settings listed below must be used for each
adjustment procedure.
Exceptions to these settings will be noted as they occur.
After completing adjustment, return the controls to the fol-
lowing settings.
Test Equipment
Digital Multimeter
Frequency Counter
Oscilloscope
Calibrator
CR Oscillator
Attenuator
Q-Meter
Distortion Meter
Insulation Meter
50ΩTermination
Model
DL-712
FC-756
CS-6010
5100B
AG-203
RA-920
4343B
885
SM-5
TA-57
Maker
KENWOOD
KENWOOD
KENWOOD
FLUKE
KENWOOD
KENWOOD
YHP
Shibasoku
TOA
KENWOOD
NAME OF KNOBS
RANGE
RELATIVE REF
POSITION
AUTO
CAL
ITEM PROCEDUREADJUSTMENT POINT
Oscilloscope
50Ωoscillator
Main unit
CAL
OUTIN
Oscillator Calibrator
OK NG NG
OUT OUT
Oscillator or calibrator
VT-183
8
ADJUSTMENT
VT-183(K)internet98.6.89:38AM y[W 15

VT-183
9
ADJUSTMENT
1V range VR101 RANGE: 1V
1) Input 1kHz (or 400 Hz), 1 Vrms sine wave, and set the pointer to 10.0 V of the 0-
10 scale. Check that the variable range is less than 98% and more than 102%
with respect to 10.0 (full-scale).
2) Waveforms shown on the oscilloscope shall not be deformed.
100 kHz TC101
frequency RANGE: 1V
characteristics 1) Input 1kHz (or 400 Hz), 1 Vrms sine wave, and adjust the oscillator output so that
the pointer of the set points at 9.0.
2) Adjust the TC so that the pointer points at 9.0 when the frequency is changed to
100 kHz while the oscillator output remains unchanged.
Auto VR202
change-over RANGE: 1V
point Hi change-over point (102%): VR201
Lo change-over point (27%): VR202
1) Hi adjustment
Input 1 kHz, 1.02 V sine wave, and make adjustment so that the range will
change at the 102% point.
2) Lo adjustment
Input 1 kHz, 0.27 V sine wave, and make adjustment so that the range will
change at the 27% point.
3) Check that the Hi-Lo change-over operation is normal.
ITEM PROCEDUREADJUSTMENT POINT
0
310
Scale 9
Scale 0-10
Scale 0-3
VT-183(K)internet98.6.89:38AM y[W 18

VT-183
10
PARTS LIST (UNIT)
*New Parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
Ref. No Add-
ress Description
Parts No.
L : Scandinavia K : USA P : Canada R : Mexico
Y : PX(Far East, Hawaii) T : Europe E : Europe G:Germany
Y : AAFES(Europe) X : Australia M : Other Areas
indicates safety critical components.
A01-4087-08 CASE;TOP
A01-4089-08 CASE;BOTTOM
A13-2254-08 SIDE FRAME
A22-1345-08 SUB PANEL
A63-0302-08 PANEL
A83-0151-08 REAR PANEL
B09-0410-08 CAP
B31-0779-08 METER
B42-6146-08 S/NO.LABEL
B42-6147-08 LABEL;KENWOOD
B63-0305-08 INSTRUCTION MANUAL
E04-0503-08 BNC RECEPTACLE
E04-0504-08 BNC RECEPTACLE
E23-1533-08 EARTH LUG
E30-1982-08 CEE POWER CORD
E30-1983-08 UL/CSA POWER CORD
E30-1984-08 JIS POWER CORD
E30-1985-08 BS POWER CORD
E30-1986-08 SAA POWER CORD
E68-0626-08 AC INLET
F11-1528-08 SHIELD CASE
F15-0785-08 BLIND PLATE
F50-0131-08 FUSE(5*20) 0.315A/250V
F50-0132-08 FUSE(5*20) 0.5/250V
H10-2894-08 FOAMED STYREN PAD
H20-1750-08 VINYL COVER
H53-0235-08 CARTON BOX
J02-0543-08 RUBBER FOOT
J11-0513-08 CLAMPER
J21-8927-08 BRACKET
K01-0564-08 HANDLE
K21-0961-08 KNOB
L07-1552-08 POWER TRANSFORMER
N09-4530-08 SCREW,SEMS BINDING M3.5*12
N09-4531-08 SCREW,TRUSS TAPTITE M3*6
N09-4532-08 SCREW,FLAT HD M4*15
N10-2030-41 HEXAGON NUT M3
N10-2040-41 HEXAGON NUT M4
N14-0644-08 FLANGE NUT M3.5
N15-1030-41 PLAIN WASHER
N16-0030-41 WASHER
N16-0040-41 SPRING WASHER
N19-0754-08 WASHER
N19-0755-08 WASHER
N30-2606-41 SCREW,PAN HD M2.6*6
N30-3006-41 SCREW,PAN HD M3*6
N30-3012-41 SCREW,PAN HD M3*12
N32-3006-41 SCREW,FLAT HD M3*6
N66-3008-41 SCREW,SEMS PAN HD M3*8
R31-0810-05 V.R.
W01-0522-08 ACCESSORIES
W02-2357-08 MAIN UNIT
W02-2363-08 CONTROL UNIT
W02-2367-08 RANGE UNIT
W02-2369-08 PANEL UNIT
1
VT-183
VT-183(K)internet98.6.89:38AM y[W 19

*New Parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
Ref. No Add-
ress Description
Parts No.
L : Scandinavia K : USA P : Canada R : Mexico
Y : PX(Far East, Hawaii) T : Europe E : Europe G:Germany
Y : AAFES(Europe) X : Australia M : Other Areas
indicates safety critical components.
J73-0539-08 PCB(UNMOUNTED)
F11-1527-08 SHIELD CASE
F01-2356-08 HEAT SINK
N30-3006-41 SCREW,PAN HD
K24-3015-08 PUSH KNOB
C101 C91-0501-05 CAP. FILM 0.047U - 630V
C102 CQ93M1H332J CAP. PLASTIC 3300P J 50V
C103 CC45FCH2H222K CAP. CERAMIC 2200P K 500V
C104 CC45FCH2H222K CAP. CERAMIC 2200P K 500V
C105 CE04EW1C331Z CAP. ELECTRO 330U Z 16V
C106 CE04EW1C331Z CAP. ELECTRO 330U Z 16V
C107 CC45FCH1H070D CAP. CERAMIC 7P D 50V
C108 CE04EW1A221Z CAP. ELECTRO 220U Z 10V
C110 CE04EW1E100Z CAP. ELECTRO 10U Z 25V
C111 CC45FCH1H010C CAP. CERAMIC 1P C 50V
C112 CC45FCH1H020C CAP. CERAMIC 2P C 50V
C113 CE04EW1C331Z CAP. ELECTRO 330U Z 16V
C114 CE04EW1C331Z CAP. ELECTRO 330U Z 16V
C115 CE04EW1C331Z CAP. ELECTRO 330U Z 16V
C116 CC45FCH1H120J CAP. CERAMIC 12P J 50V
C117 CC45FCH1H120J CAP. CERAMIC 12P J 50V
C118 CE04EW1C331Z CAP. ELECTRO 330U Z 16V
C119 CE04EW1C101Z CAP. ELECTRO 100U Z 16V
C121 CE04EW1C470Z CAP. ELECTRO 47U Z 16V
C122 CE04EW1C331Z CAP. ELECTRO 330U Z 16V
C123 CE04EW1C470Z CAP. ELECTRO 47U Z 16V
C124 CC45FCH1H220J CAP. CERAMIC 22P J 50V
C126 CE04EW1C101Z CAP. ELECTRO 100U Z 16V
C129 CE04HW1H010Z CAP. ELECTRO 1U Z 50V
C130 CE04HW1H010Z CAP. ELECTRO 1U Z 50V
C132 CE04EW1C470Z CAP. ELECTRO 47U Z 16V
C133 CE04EW1C470Z CAP. ELECTRO 47U Z 16V
C134 CE04EW1C102M CAP. ELECTRO 1000U M 16V
C135 CE04EW1C102M CAP. ELECTRO 1000U M 16V
C136 CQ92FM1H104J CAP. PLASTIC 0.1U J 50V
C137 CQ92FM1H104J CAP. PLASTIC 0.1U J 50V
C138 CQ92FM1H104J CAP. PLASTIC 0.1U J 50V
C139 CQ92FM1H104J CAP. PLASTIC 0.1U J 50V
C140 CC45FCH2H222K CAP. CERAMIC 2200P K 500V
C142 CC45FCH1H120J CAP. CERAMIC 12P J 50V
C143 CC45FCH1H070D CAP. CERAMIC 7P D 50V
C147 CQ92FM1H103J CAP. PLASTIC 0.01U J 50V
C148 CC45FCH1H100J CAP. CERAMIC 10P J 50V
C150 CQ92BPA1H122K CAP. PLASTIC 1200P K 50V
C151 CQ92FM1H104J CAP. PLASTIC 0.1U J 50V
C152 CE04EW1A471Z CAP. ELECTRO 470U Z 10V
C153 CC45FCH1H010C CAP. CERAMIC 1P C 50V
D101 1N4148 DIODE
D106 1N4148 DIODE
D107 1N4148 DIODE
D108 1N4148 DIODE
D109 1N4148 DIODE
D110 1N4148 DIODE
D111 1N4148 DIODE
D112 1N4148 DIODE
1
*New Parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
Ref. No Add-
ress Description
Parts No.
L : Scandinavia K : USA P : Canada R : Mexico
Y : PX(Far East, Hawaii) T : Europe E : Europe G:Germany
Y : AAFES(Europe) X : Australia M : Other Areas
indicates safety critical components.
D114 1N4148 DIODE
D115 1N4148 DIODE
D117 1N4148 DIODE
D118 1N4148 DIODE
D119 1N4148 DIODE
D120 1N4148 DIODE
D121 1N4148 DIODE
D122 1N4148 DIODE
D123 1N4148 DIODE
D124 1N4148 DIODE
D125 1N4148 DIODE
D126 1N4148 DIODE
D127 1N4148 DIODE
D128 1N4148 DIODE
D129 1N4148 DIODE
D130 1N4148 DIODE
D131 1N4148 DIODE
D132 1N4148 DIODE
D133 1N4148 DIODE
D134 W02 DIODE,BRIDGE
D136 1N4148 DIODE
D137 1N4148 DIODE
D138 1N4148 DIODE
D139 1N4148 DIODE
D140 1N4148 DIODE
D141 1N4148 DIODE
D142 1N4148 DIODE
D143 1N4148 DIODE
K101 S51-1503-05 RELAY
K102 S51-1503-05 RELAY
P1 E40-7604-08 CONNECTOR 2P
P2 E40-7604-08 CONNECTOR 2P
P3 E40-7606-08 CONNECTOR 4P
P4 E40-7604-08 CONNECTOR 2P
P6 E40-7605-08 CONNECTOR 3P
P8 E40-7605-08 CONNECTOR 3P
P9 E40-7606-08 CONNECTOR 4P
P10 E40-7605-08 CONNECTOR 3P
P11 E40-7604-08 CONNECTOR 2P
P101A E40-7608-08 CONNECTOR 7P
P101B E40-7607-08 CONNECTOR 6P
P102 E40-7601-08 CONNECTOR 8P
P103 E40-7601-08 CONNECTOR 8P
Q101 2SK163(K) FET
Q102 2SK163(K) FET
Q103 2SA970(GR) TR.SI,PNP
Q104 2SC1923(O) TR.SI,NPN
Q105 2SA1015(GR) TR.SI,PNP
Q106 2SA1015(GR) TR.SI,PNP
Q107 2SA1015(GR) TR.SI,PNP
Q108 2SA1015(GR) TR.SI,PNP
Q109 2SA1015(GR) TR.SI,PNP
Q110 2SA1015(GR) TR.SI,PNP
Q111 2SC1815(GR) TR.SI,NPN
Q112 2SA970(GR) TR.SI,PNP
2
MAIN UNIT (W02-2357-08)
VT-183
11
PARTS LIST (ELECTRICAL)
VT-183(K)internet98.6.89:38AM y[W 20

*New Parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
Ref. No Add-
ress Description
Parts No.
L : Scandinavia K : USA P : Canada R : Mexico
Y : PX(Far East, Hawaii) T : Europe E : Europe G : Germany
Y : AAFES(Europe) X : Australia M : Other Areas
indicates safety critical components.
Q113 2SA970(GR) TR.SI,PNP
Q114 2SC1923(O) TR.SI,NPN
Q115 2SC1923(O) TR.SI,NPN
Q116 2SA970(GR) TR.SI,PNP
Q117 2SA970(GR) TR.SI,PNP
Q118 2SC1923(O) TR.SI,NPN
Q119 2SA970(GR) TR.SI,PNP
Q120 2SA970(GR) TR.SI,PNP
Q121 2SK30A(Y) FET
Q122 2SC1923(O) TR.SI,NPN
Q123 2SC1923(O) TR.SI,NPN
Q124 2SK30A(Y) FET
R101 RN14BK2H1005F RES. METAL FILM - F 1/2W
R102 RN14BK2B9531F RES. METAL FILM 9.53K F 1/8W
R103 R92-1450-05 RESISTOR 6.8K - 1
R104 RD14BB2B681J RES.CARBON FILM 680 J 1/8W
R106 RD14BB2B335J RES.CARBON FILM - J -
R107 RD14BB2B472J RES.CARBON FILM 4.7K J 1/8W
R108 RD14BB2B201J RES.CARBON FILM 200 J -
R109 RD14BB2E102J RES.CARBON FILM 1K J 1/4W
R110 RD14BB2E750J RES.CARBON FILM 75 J 1/4W
R111 RN14BK2B1100D RES. METAL FILM 110 D 1/8W
R112 RN14BK2B1561D RES. METAL FILM 1.56K D 1/8W
R113 RN14BK2B60R0D RES. METAL FILM 60 D 1/8W
R114 RN14BK2B2780D RES. METAL FILM 278 D 1/8W
R115 RN14BK2B2780D RES. METAL FILM 278 D 1/8W
R116 RN14BK2E1910D RES. METAL FILM 191 D 1/4W
R117 RD14BB2B151J RES.CARBON FILM 150 J 1/8W
R118 RN14BK2B4120D RES. METAL FILM 412 D 1/8W
R119 RN14BK2B4120D RES. METAL FILM 412 D 1/8W
R120 RN14BK2B4120D RES. METAL FILM 412 D 1/8W
R121 RD14BB2B150J RES.CARBON FILM 15 J 1/8W
R122 RD14BB2B472J RES.CARBON FILM 4.7K J 1/8W
R123 RD14BB2B472J RES.CARBON FILM 4.7K J 1/8W
R124 RD14BB2B472J RES.CARBON FILM 4.7K J 1/8W
R125 RD14BB2B472J RES.CARBON FILM 4.7K J 1/8W
R126 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R127 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R128 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R129 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R130 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R131 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R132 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R133 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R134 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R135 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R136 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R137 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R138 RD14BB2B334J RES.CARBON FILM 330K J 1/8W
R139 RD14BB2B683J RES.CARBON FILM 68K J 1/8W
R140 RD14BB2E432J RES.CARBON FILM 4.3K J 1/4W
R141 RD14BB2B121J RES.CARBON FILM 120 J 1/8W
R142 RD14BB2E432J RES.CARBON FILM 4.3K J 1/4W
R143 RD14BB2B272J RES.CARBON FILM 2.7K J 1/8W
R144 RN14BK2B6191F RES. METAL FILM 6.19K F 1/8W
3
*New Parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
Ref. No Add-
ress Description
Parts No.
L : Scandinavia K : USA P : Canada R : Mexico
Y : PX(Far East, Hawaii) T : Europe E : Europe G : Germany
Y : AAFES(Europe) X : Australia M : Other Areas
indicates safety critical components.
R145 RD14BB2B681J RES.CARBON FILM 680 J 1/8W
R146 RN14BK2B2200F RES. METAL FILM 220 F 1/8W
R147 RD14BB2B121J RES.CARBON FILM 120 J 1/8W
R148 RD14BB2E3R3J RES.CARBON FILM 3.3 J 1/4W
R149 RD14BB2E432J RES.CARBON FILM 4.3K J 1/4W
R150 RD14BB2B390J RES.CARBON FILM 39 J 1/8W
R151 RD14BB2E432J RES.CARBON FILM 4.3K J 1/4W
R152 RD14BB2B390J RES.CARBON FILM 39 J 1/8W
R153 RD14BB2B390J RES.CARBON FILM 39 J 1/8W
R154 RD14BB2B220J RES.CARBON FILM 22 J 1/8W
R155 RD14BB2B272J RES.CARBON FILM 2.7K J 1/8W
R156 RD14BB2E3R3J RES.CARBON FILM 3.3 J 1/4W
R157 RD14BB2B681J RES.CARBON FILM 680 J 1/8W
R158 RN14BK2B1692F RES. METAL FILM 16.9K F 1/8W
R159 RN14BK2B3010F RES. METAL FILM 301 F 1/8W
R160 RD14BB2B621J RES.CARBON FILM 620 J 1/8W
R161 RN14BK2B5230F RES. METAL FILM 523 F 1/8W
R162 RD14BB2B472J RES.CARBON FILM 4.7K J 1/8W
R163 RN14BK2B3010F RES. METAL FILM 301 F 1/8W
R164 RN14BK2B3480F RES. METAL FILM 348 F 1/8W
R165 RD14BB2E432J RES.CARBON FILM 4.3K J 1/4W
R166 RD14BB2E432J RES.CARBON FILM 4.3K J 1/4W
R167 RD14BB2B390J RES.CARBON FILM 39 J 1/8W
R168 RD14BB2B681J RES.CARBON FILM 680 J 1/8W
R169 RD14BB2B114J RES.CARBON FILM 110K J 1/8W
R170 RD14BB2B683J RES.CARBON FILM 68K J 1/8W
R171 RD14BB2B331J RES.CARBON FILM 330 J 1/8W
R172 RD14BB2B331J RES.CARBON FILM 330 J 1/8W
R173 RN14BK2B10R0F RES. METAL FILM 10 F 1/8W
R174 RD14BB2B331J RES.CARBON FILM 330 J 1/8W
R177 RD14BB2B472J RES.CARBON FILM 4.7K J 1/8W
R178 RD14BB2B472J RES.CARBON FILM 4.7K J 1/8W
R179 RD14BB2B331J RES.CARBON FILM 330 J 1/8W
R180 RD14BB2B472J RES.CARBON FILM 4.7K J 1/8W
R181 RD14BB2B201J RES.CARBON FILM - J 1/8W
R184 RD14BB2E102J RES.CARBON FILM 1K J 1/4W
R186 RD14BB2B161J RES.CARBON FILM 160 J 1/8W
TC101 C05-0707-08 CAP.TRIMMER
U101 MC14066BCP IC,QUAD ANALOG SWITCH/MPX
U102 LM7805 IC,FIXED VOLTAGE REGULATOR
U103 LM7905 IC,FIXED VOLTAGE REGULATOR
VR101 R12-1545-05 RES. SEMI FIXED 1K - 0.1
VR102 R12-0575-05 RES. SEMI FIXED 100 - 0.1
J73-0544-08 PCB(UNMOUNTED)
C201 CQ92FM1H104J CAP. MYLAR 0.1U J 50V
C202 CQ92FM1H104J CAP. MYLAR 0.1U J 50V
C203 CC45FCH1H010C CAP. CERAMIC 1P C 50V
C204 CC45FCH1H010C CAP. CERAMIC 1P C 50V
C205 CE04EW1C331Z CAP. ELECTRO 330U Z 16V
C206 CS15E1C4R7M CAP. TANTALUM 4.7U M 16V
C207 CS15E1C4R7M CAP. TANTALUM 4.7U M 16V
C208 CS15E1C4R7M CAP. TANTALUM 4.7U M 16V
C209 CS15E1C010M CAP. TANTALUM 1U M 16V
4
CONTROL UNIT (W02-2363-08)
VT-183
12
PARTS LIST
VT-183(K)internet98.6.89:38AM y[W 17

VT-183
13
PARTS LIST
*New Parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
Ref. No Add-
ress Description
Parts No.
L : Scandinavia K : USA P : Canada R : Mexico
Y : PX(Far East, Hawaii) T : Europe E : Europe G:Germany
Y : AAFES(Europe) X : Australia M : Other Areas
indicates safety critical components.
C210 CS15E1C4R7M CAP. TANTALUM 4.7U M 16V
C211 CS15E1C010M CAP. TANTALUM 1U M 16V
C212 CQ92FM1H103J CAP. MYLAR 0.01U J 50V
C213 CQ92FM1H154K CAP. MYLAR 0.15U K 50V
C214 CC45FCH2H222K CAP. CERAMIC 2200P K 500V
C215 CC45FCH2H222K CAP. CERAMIC 2200P K 500V
C216 CC45FCH2H222K CAP. CERAMIC 2200P K 500V
C217 CC45FCH2H222K CAP. CERAMIC 2200P K 500V
C218 CS15E1C4R7M CAP. TANTALUM 4.7U M 16V
C219 CS15E1C4R7M CAP. TANTALUM 4.7U M 16V
D201 1N4148 DIODE
D202 1N4148 DIODE
D203 1N4148 DIODE
D204 1N4148 DIODE
D205 1N4148 DIODE
D206 1N4148 DIODE
D207 1N4148 DIODE
P201A E40-7608-08 PIN CONNECTOR 7P
P201B E40-7607-08 PIN CONNECTOR 6P
P202 E40-7603-08 PIN CONNECTOR 15P
P203 E40-7611-08 PIN CONNECTOR 12P
Q201 2SA970(GR) TR. SI, PNP
Q202 2SA970(GR) TR. SI, PNP
Q203 2SC1923(O) TR. SI, NPN
Q204 H945P TR.
Q205 H945P TR.
Q206 H945P TR.
Q208 H945P TR.
Q209 H945P TR.
Q210 H945P TR.
R201 RD14B2E432J RES. CARBON 4.3K J 1/4W
R202 RD14BB2E390J RES. CARBON 39 F 1/4W
R203 RD14BB2E681J RES. CARBON 680 J 1/4W
R204 RD14B2E432J RES. CARBON 4.3K J 1/4W
R205 RN14BK2E1692F RES. METAL FILM 16.9K F 1/4W
R206 RN14BK2E3010F RES. METAL FILM 301 F 1/4W
R207 RD14B2E432J RES. CARBON 4.3K J 1/4W
R208 RD14BB2E223J RES. CARBON 22K J 1/4W
R209 RD14BB2E333J RES. CARBON 33K J 1/4W
R210 RD14BB2E102J RES. CARBON 1K J 1/4W
R211 RD14BB2E102J RES. CARBON 1K J 1/4W
R212 RD14BB2E223J RES. CARBON 22K J 1/4W
R213 RD14BB2E153J RES. CARBON 15K J 1/4W
R214 RD14BB2E153J RES. CARBON 15K J 1/4W
R215 RD14BB2E102J RES. CARBON 1K J 1/4W
R216 RD14BB2E223J RES. CARBON 22K J 1/4W
R217 RD14BB2E223J RES. CARBON 22K J 1/4W
R218 RD14BB2E392J RES. CARBON 3.9K F 1/4W
R219 RD14BB2E114J RES. CARBON 110K J 1/4W
R220 RD14BB2E392J RES. CARBON 3.9K F 1/4W
R221 RD14BB2E223J RES. CARBON 22K J 1/4W
R222 RD14BB2E102J RES. CARBON 1K J 1/4W
R223 RD14BB2E334J RES. CARBON 330K J 1/4W
R224 RD14BB2E223J RES. CARBON 22K J 1/4W
R225 RD14BB2E223J RES. CARBON 22K J 1/4W
5
*New Parts
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
Ref. No Add-
ress Description
Parts No.
L : Scandinavia K : USA P : Canada R : Mexico
Y : PX(Far East, Hawaii) T : Europe E : Europe G:Germany
Y : AAFES(Europe) X : Australia M : Other Areas
indicates safety critical components.
R226 RD14BB2E103J RES. CARBON 10K J 1/4W
R227 RD14BB2E681J RES. CARBON 680 J 1/4W
R228 RD14BB2E223J RES. CARBON 22K J 1/4W
R229 RN14BK2E2212F RES. METAL FILM 22.1K F 1/4W
R230 RN14BK2E2212F RES. METAL FILM 22.1K F 1/4W
R231 RN14BK2E3303F RES. METAL FILM 330K F 1/4W
R232 RD14BB2E102J RES. CARBON 1K J 1/4W
R233 RN14BK2E6040F RES. METAL FILM 604 F 1/4W
R234 RN14BK2E2431F RES. METAL FILM 2.43K F 1/4W
R235 RN14BK2E1623F RES. METAL FILM 162K F 1/4W
R236 RN14BK2E2212F RES. METAL FILM 22.1K F 1/4W
R237 RD14BB2E223J RES. CARBON 22K J 1/4W
R238 RD14BB2E223J RES. CARBON 22K J 1/4W
R239 RD14BB2E223J RES. CARBON 22K J 1/4W
R240 RD14BB2E223J RES. CARBON 22K J 1/4W
R241 RD14BB2E223J RES. CARBON 22K J 1/4W
R242 RD14BB2E223J RES. CARBON 22K J 1/4W
R243 RD14BB2E334J RES. CARBON 330K J 1/4W
R244 RD14BB2E223J RES. CARBON 22K J 1/4W
R245 RD14BB2E223J RES. CARBON 22K J 1/4W
R246 RD14BB2E102J RES. CARBON 1K J 1/4W
U201 FUA3403PC IC,QUAD OP AMP
U202 MC14011UB IC,QUAD 2-INPUT NAND GATE
U203 F40193BPC IC,4-BIT SYNC. COUNT UP/DOWN
U204 SN74LS156N IC,DUAL 1 OF 4 DECODER/DE-MPX
U205 SN74LS156N IC,DUAL 1 OF 4 DECODER/DE-MPX
VR201 R32-0884-08 V.R. 1K
VR202 R32-0884-08 V.R. 1K
J73-0541-08 PCB(UNMOUNTED)
E40-7610-08 CONNECTOR 6P
S68-0658-08 PUSH SWITCH
S68-0659-08 PUSH SWITCH
J73-0545-08 PCB(UNMOUNTED)
P5 E40-7604-08 CONNECTOR 2P
P1 E40-7606-08 CONNECTOR 4P
S40-6501-05 PUSH SWITCH
S68-0660-08 PUSH KNOB
6
RANGE UNIT (W02-2367-08)
PANEL UNIT (W02-2369-08)
VT-183(K)internet98.6.89:38AM y[W 16

AB DC E
2
1 3 5 7
4
6
SCHEMATIC DIAGRAM
VT-183(K)internet98.6.89:38AM y[W 13

F H JG I
2
1 3 5 7
4
6
SCHEMATIC DIAGRAM
VT-183(K)internet98.6.89:38AM y[W 12

KL NM O
2
1 3 5 7
4
6
SCHEMATIC DIAGRAM
VT-183(K)internet98.6.89:37AM y[W 9

P R TQ S
2
1
3
5
7
4
6
SCHEMATIC DIAGRAM
VT-183(K)internet98.6.89:37AM y[W 8

P103
J117
R182
R154
R134
R138
C110
P1
Q101
Q103
Q102 Q104
R183
R111
R118
R123
Q106
C140
J125
C148
C142
R162
C101 C150
Q118
C116
C106
Q116
C107
D136
D138
D137 D139
D142
Q124
D141
Q115 R156
Q114
Q113
Q112
J105
Q105
R126
C137
C136
Q123
Q119
Q120
C126
C132
D134
R180
C130
Q111
Q109
R127
R177 C138
C139
R148
C121
J108
R157
R159
Q117
R149
J106
J107
C118
R174
R163
C124
R164 R170
R186
Q121
Q122
C134
25-25427-5C
J114
D107
D108
D109
D110
D111
D114
D115
D112
D120
D113
D116
D117
D118
R184
P11
J113
Q108
D129
C151
J121 J120
U3D121
D125
Q110
J127
J122
R137
D126
D135
D123
J123 D127
D130
D124
D128
J124
U2
Q107
J126
P6
C129
R122
J115
J118
R130
R128
J116
C103
P101
J119
U1
U101
D106
R125
R124
J102
J101
R135
C114
R108
D122
R131
R133
J128
J103
R139
R116
C115
R110
R120
R121
R117
P102
C113
VR102
R115
R114
K102
D119
R132
P10
R147
R119
R136
P8
R129
R145
R140
R141
R113
R112
J110
R142
R146
C147
R109
C108
C135
U103
R178
R143
J104
C112
J3
R107
R106
R155
J1 R104
J2
P9
C111
R144
C104
D101
U102
R153
D103
D143
D140
R103
K101
R185
J109
R152
D102
C105
R171
R151
R150
C141
R181
P7
R173
D133 D132
D131
R172
J112
J111
R166
R165
VR101
R101
R189
R168
C123
R179
R160
R158
C102
C143
C128
C153
P3
P5
C119
C117
C144
TC101
C133
C152
R167
P2
R102
P4
C122
R161
300mV 1.0V frequency characteristics
18
AB DC E
2
1
3
5
7
4
6
PC BOARD (Component side view)
MAIN UNIT(W02-2357-08)
RANGE UNIT
(W02-2367-08)
Pattern side view
PANEL UNIT(W02-2369-08)
Pattern side view
VT-183(K)internet98.6.89:37AM y[W 5

R218
R217
R215
C218
R243
J121
J123
J124
U202
4011
C219
J113
Q204
C208
C207
R209
Q203
LED
R241
R242
P-203
J116
J108
Q210
P-202
R245
R246
J115
U203
40193
J114
J118
74LS156
74LS156
U205
74LS156
74LS156
U204
J127
R225
R224
D203
D204
D206
J126
J129
C212
40193
R240
4011
C217
R230
C213
J125
R232
D202
D207
U201
J128
3403
J105
3403
R223
R236
C211
R216
C210
R228
Q209
C209
J104
C206
R237
C214
R205
Q202
R202
C203
C205
R226
VR202
VR201
R210
D201
J103
Q208
Q206
Q207
Q205
J106
J111
D205
R231
R219
R229
R213
J102 R235
R212 R234
R214
R233
R208 C216
C215
R211
J122
R239
R238
J120
J119
J112
J101
R207
C204
J109
R206
R204
J117
R 244
J107
R201
R203
R220 C201
C202
P-201
R222
R227
J110
R221
Q201
19
PC BOARD (Component side view)
CONTROL UNIT (W02-2363-08)
FHJGI
2
1
3
5
7
4
6
Refer to the schematic diagram for the values of resistors and capacitors.
VT-183(K)internet98.6.95:44PM y[W 4

VT-183
A product of
KENWOOD TMI CORPORATION
1-16-2, Hakusan, Midori-ku, Yokohama City 226, Japan
VT-183(K)internet98.6.89:34AM y[W 1