JVC MX-KB4 User manual

SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB196
2004/6
COMPACT COMPONENT SYSTEM
MB19620045
MX-KB4
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
FM MODE
FM /AM
AUX
SLEEP
STANDBY/ON
CD 1 CD 2 CD 3
SOUND
MODE
RHYTHM AX
FADE
MUTING
VOLUME
PROGRAM/RANDOM REPEAT
TAPE
A
CD
TAPE
B
REMOTE CONTROL
CA-MXKB4SP-MXKB4 SP-MXKB4
Area suffix
J ---------------------------- U.S.A.
C ------------------------- Canada

1-2 (No.MB196)
SPECIFICATION
Design and specifications are subject to change without notice.
Amplifier Output Power 180 W per channel, min. RMS, driven into 6 Ωat 1kHz, with no more
than 10% total harmonic distortion
Input Sensitivity/Impedance (1 kHz) AUX IN:400 mV/50 kΩ
Speaker terminals 6 - 16 Ω
Phones 32 Ω- 1 kΩ
Cassette Deck Frequency Response 15 mW/ch output into 32 Ω
Type I (NORMAL) 63 Hz - 12 500 Hz
Wow And Flutter 0.15% (WRMS)
CD Player CD Capacity 3 CDs
Dynamic Range 85 dB
Signal-To-Noise Ratio 85 dB
Wow And Flutter Unmeasurable
Tuner FM Tuner Tuning Range:87.5 MHz - 108.0 MHz
AM Tuner Tuning Range:530 kHz - 1 710 kHz
Unit Dimensions 270 mm ×306 mm ×456 mm (W/H/D) (10-11/16" ×12-1/16" ×18")
Mass Approx. 8.6 kg (19.0 lbs)
Speaker Specifications
SP-MXKB4 (each unit)
Type 3-way bass-reflex type
Speaker Unit Woofer:20 cm (7-7/8") cone ×1
Mid:5cm (2") cone ×1
Tweeter:2 cm (13/16") dome ×1
Power Handling Capacity 180 W
Impedance 6 Ω
Frequency Range 45 Hz - 22,000 Hz
Sound pressure level 87 dB/W·m
Dimensions 257 mm ×321 mm ×261 mm (W/H/D) (10-1/8" ×12-11/16" ×10-5/16")
Mass Approx. 4.9 kg (10.9 lbs)
Power Specifications Power Requirements AC 120 V , 60 Hz
Power Consumption 150 W (power on mode)
22 W (in Standby mode)

(No.MB196)1-3
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per-
formed by qualified personnel only.
(2) Alterations of the design or circuitry of the product should
not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety charac-
teristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or
other hazards.
(4) The leads in the products are routed and dressed with ties,
clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or
sharp edges for the prevention of electric shock and fire
hazard. When service is required, the original lead routing
and dress should be observed, and it should be confirmed
that they have been returned to normal, after reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna terminals, knobs, metal cabinet, screw heads,
headphone jack, control shafts, etc.) to be sure the product
is safe to operate without danger of electrical shock.Do not
use a line isolation transformer during this check.
• Plug the AC line cord directly into the AC outlet. Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal parts of the cabinet, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent must not exceed 0.5mA AC (r.m.s.).
• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex-
posed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant
safety standards.
(4) It is essential that safety critical components are replaced
by approved parts.
(5) If mains voltage selector is provided, check setting for local
voltage.
1.3 Caution
Burrs formed during molding may be left over on some parts
of the chassis.
Therefore, pay attention to such burrs in the case of pre-
forming repair of this system.
1.4 Critical parts for safety
In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical
for safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

1-4 (No.MB196)
1.5 Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.5.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.6 Handling the traverse unit (optical pickup)
(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the
replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a
time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible
wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
CD changer
unit
Soldering
Flexible cable

(No.MB196)1-5
1.8 Importance administering point on the safety
Caution: For continued protection against risk of
fire, replace only with same type 3.5A/125V for
F901 and 1.6A/250V for F902.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F901 comme le meme type
que 3.5A/125V et 1.6A/250V pour F902.
Ce sont des fusibles suretes qui functionnes rapide.
^

1-6 (No.MB196)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB196)1-7
SECTION 3
DISASSEMBLY
3.1 Disassembly of the main blocks of the set
Replacement of the fuses and the power IC
3.1.1 Replacing the fuses
(See Fig.1)
• Prior to performing the following procedure, remove the left
side board.
(1) Replace the fuses inside.
Caution:
Be sure to use fuses with the specified ratings.
Fig.1
3.1.2 Replacing the power IC
(See Fig.2)
• Prior to performing the following procedure, remove the top
cover.
(1) Remove the two screws Afrom the heat sink between the
power IC.
(2) Remove the solder fixing the power IC.
Fig.2
3.1.3 Replacing the heat sink cover
(See Fig.3)
(1) Remove four screws Bfrom the rear panel.
(2) Pull the heat sink cover outward.
Fig.3
Fuse (F901)
3.5A 125V
Fuse (F902)
1.6A 250V
WA
B

1-8 (No.MB196)
3.1.4 Removing the top cover
(See Fig.4 and 5)
(1) Remove six screws Cthat retain the top cover from the
panel rear of the body.
(2) Remove six screws Dthat retain the top cover from the two
sides of the body.
(3) Remove the top cover from the body by lifting it toward the
rear.
Fig.4
Fig.5
Top cover
C
CC
Right Front panel assembly
D
D
Left Front panel assembly
D
D

(No.MB196)1-9
3.1.5 Removing the CD changer unit
(See Fig.6 to 9)
• Prior to performing the following procedures, remove the top
cover.
Caution:
Although the CD mechanism unit can be removed without re-
moving the CD tray panel, it is still recommended to remove it
in order to prevent damage.
a. From the front panel side of this set, push in the sections
marked with arrows and pull out the CD tray toward the
front.
b. Remove the CD tray panel by pushing both of its extremi-
ties upward in the direction of the arrows.
c. Push the CD tray deep into the set.
(1) Disconnect the cord wires from the CD board CN703 and
CN203.
(2) From the rear of the set, remove two screws E, two screws
Fand four screws Gon the front panel left and right side.
(3) Handle the CD changer unit rear, take out the unit.
Fig.6
Fig.7
Fig.8
Fig.9
CD tray panel
CD tray panel
F
Antenna
terminal
E
G

1-10 (No.MB196)
3.1.6 Removing the front panel assembly
(See Fig.10 to 11)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
(1) Disconnect the parallel wire and the cord wire from the con-
nectors CN701, CN101 on the power amp. PCB.
(2) Remove one screws Hretaining the front panel assembly
onto the bottom of the body.
(3) Remove two screws Ion the left and right side of the set re-
taining the panel front from the bottom and then remove
then GND lug bthat comes from the amp and supply
board.
(4) Disengage the claws con both sides of the front panel as-
sembly and then remove the assembly.
Fig.10
Fig.11
H
Claw
GND lugGND lug
abc

(No.MB196)1-11
3.2 Disassembly of units and assembly inside this set
3.2.1 Removing the Main board
(See Fig.12 to 13)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
(1) Disconnect the wires from CN603A, CN603B and CN604
on the Main board, which is located on the back side of the
CD changer unit.
(2) The four screws Jthat retain the CD board should be re-
moved.
(3) Remove the CD board by pulling it toward the side where
the CN601 is located.
(4) Using solder, short the CD pickup to connect to short
round.
Caution:
After re-connecting the wires, be sure to remove the
shorting solder from the GND connection.
(5) Disconnect the card wire from the connector CN601 on the
Main board and then remove the Main board. Fig.12
Fig.13
J
PAIN PCB
J
J
CD PCB
Short round
CN601

1-12 (No.MB196)
3.2.2 Removing the CD changer mechanism assembly
(See Fig.14 to 15)
• Also remove the CD changer unit.
(1) Turn the CD changer mechanism cover base and remove
the screws dconnecting the unit to the CD changer mech-
anism assembly.
(2) Removing four screws eretaining the CD mechanism hold-
er assembly.
Caution:
When replacing the CD changer mechanism assembly, be
sure not to mistake the positions of the silver color and copper
color spring.
Fig.14
Fig.15
d
CD changer
unit
e ( Green color )
e ( Red color )
e ( Green color )
e ( Red color )
CD changer
mechanism
assembly

(No.MB196)1-13
3.2.3 Removing the CD pickup
(See Fig.16)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
• Also remove the CD changer mechanism.
(1) Widen the section f.
(2) While keeping the section fwide open, push the section g
in the direction of the arrow to remove the shaft, and then
remove the CD pickup.
Fig.16
3.2.4 Replacing the loading motor and rotor belt of the CD changer
(See Fig .17)
• Prior to performing the following procedures, remove the top
cover.
• Also open the CD changer tray.
(1) Remove the two screws Lretaining the CD changer tray
loading motor.
(2) Remove the two screws Mretaining the gear plate and take
it out, after remove the rotor belt from the pulley.
Fig.17
3.2.5 Replacing the CD turn table and removing the motor
(See Fig.18 )
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
(1) Remove the one screws retaining the CD (Turn table).
(2) Remove the two screws retaining the stopper brackets on
both sides of the CD changer unit.
(3) Remove the stopper brackets from both sides of the CD
changer unit.
(4) Pull out the CD tray from the CD changer unit, all the way
and lift the tray to remove.
(5) Remove the gear and after push out the tray motor locker
and pull out the tray motor from the CD tray.
Fig.18
g
f
CD pickup
Shaft
M
L
Motor locker
Turn table motor
Obligue gea
r

1-14 (No.MB196)
3.2.6 Removing the cassette deck mechanism
(See Fig.19)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove six screws Zretaining the cassette deck mecha-
nism.
Fig.19
3.2.7 Removing the Key open board & the Key rec board
(See Fig.20)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove two screws Pthat retains the Key open board.
(2) Remove three screws Lthat retains the Key REC board.
Fig.20
3.2.8 Removing the Display board
(See Fig.21)
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove six screws Qthat retain the Display board from the
back of the front panel unit.
Fig.21
Z
Z
Front panel
assembly
Front panel
assembly
PL
Front panel
assembly
Key open
board
Key REC
board
Q
Display
PCB
Q

(No.MB196)1-15
3.2.9 Removing the Switch board and sound mode and CD function switch board
(See Fig.20 to 23)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Pull out the volume control knob from the front of the front
panel assembly.(Fig.22)
(2) Remove six screws Qretaining the front panel assembly.
(3) Remove the Control/FL board.
(4) Remove eleven screws retaining the Switch (key 1)
board.(Fig.20)
(5) Remove two screws Sretaining the sound mode and CD
function (key 2) switch board.(Fig.21)
Fig.22
Fig.23
Volume knob
Front panel assembl
y
Front panel
assembly
Volume
shaft

1-16 (No.MB196)
3.2.10 Removing the cassette deck main motor, and replacing the main belts
(See Fig.19, 24 and 25)
• Prior to performing the following procedures, remove the top
cover and both sides board.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove six screws Zretaining the cassette deck mecha-
nism. (Fig.19)
(2) Remove the cassette deck mechanism.
(3) Remove two screws tretaining the main motor from the
front side of the cassette deck.
Caution:
After attaching the main motor, check the orientation of
the motor and the polarity of the wires.
(4) From the backside of the cassette deck, remove the main
motor and two main belts.
Caution:
The lengths of the cassette A(playback only) and cas-
sette B(record/play) main belts are different. When at-
taching the main belts, use the longer belt for cassette A.
Fig.24
Fig.25
3.2.11 Removing the leaf switches of the cassette deck mechanism
(See Fig. 19 and 26)
• Prior to performing the following procedures, remove the top
cover and both sides board.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove the six screws Zthat retain the cassette deck
mechanism. (Fig.19)
(2) Remove the cassette deck mechanism.
(3) Turn the cassette deck mechanism upside down.
(4) Remove the solder from around the leaf switches.
(5) Pull out the leaf switches from the front side of the cassette
deck mechanism.
Fig.26
t
Cassette deck mechanism
(Front side)
Cassette deck mechanism
(Back side) Cassette deck main moto
r
Main belt
(For A cassette)
Main belt
(For B cassette)
Cassette deck mechanism
(Back side)
Solder side of leaf switch

(No.MB196)1-17
3.2.12 Removing the cassette deck heads
(See Fig. 19 and 27)
• Prior to performing the following procedures, remove the top
cover and both sides board.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove six screws Zthat retain the cassette deck mecha-
nism. (Fig.19)
(2) Remove the cassette deck mechanism and place it so that
the front side faces up.
(3) Remove the solder from the bottom side of the head termi-
nal and disconnect the wire.
(4) Remove screws Uthat retains the head.
(5) Remove screws Vthat retains the head.
(6) Hold the head and slide it in the direction of the arrow to re-
move it.
Fig.27
3.2.13 Removing the 3-pin regulator and bridge diode
(See Fig. 28)
• Prior to performing the following procedures, remove the top
cover and both sides board.
Remove two screws Athat connect the heat sink.
(1) Remove two screws Athat connect the heat sink.
(2) Remove two screws Wthat connect the heat sink.
(3) Remove the solder fixing the the 3-pin terminal regulator
Q604, Q608.
(4) Remove the solder fixing the 4-pin bridge diode (D614,
D615).
Fig.28
Cassette deck mechanism
(Front side)
V U
PB Head REC/PB Head
VU
A
W

1-18 (No.MB196)
3.2.14 Removing the Power amp and Supply board and the Power trans board
(See Fig. 3, 29 to 31)
• Prior to performing the following procedures, remove the top
cover and CD changer unit.
(1) Remove four screws Bfrom the rear panel. (Fig.3)
(2) Pull the heat sink cover outward.
(3) Remove four screws AA from the rear panel between the
heat sink holder.
(4) Remove four screws YY that retains the rear panel, and
then remove the rear panel.
(5) Disconnect the parallel wires from the connectors FW951
on the Power trans board.
(6) Remove screws Zthat retain the Power amp and Supply
board and then remove the assembly.
(7) Remove the clamp of AC power cord from the chassis.
(8) Remove four screws that retain the Power trans board and
then remove the assembly.
Fig.29
Fig.30
Fig.31
Fuse (F901)
3.5A 125V
Fuse (F902)
1.6A 250V
YY
Clamp
A
A
Chassis
Rear panel Power amp and
supply board
Z

(No.MB196)1-19
SECTION 4
ADJUSTMENT
4.1 Measurement Instruments Required for Adjustment
(1) Low frequency oscillator
This oscillator should have a capacity to output 0dBs to
600Ωat an oscillation frequency of 50Hz-20kHz.
(2) Attenuator impedance : 600Ω
(3) Electronic voltmeter
(4) Frequency counter
(5) Wow & flutter meter
(6) Test tape
VT712 : For Tape speed and wow flutter ( 3kHz)
VT703 : For Head angle (10kHz)
(7) Blank tape
TYPE l : AC-225
TYPE ll : AC-514
(8) Torque gauge
For play and back tension forward; TW2111A
Reverse; TW2121A
Fast Forward and Rewind; TW2231A
(9) Test disc
CTS-1000(12cm)
GRG-1211(8cm)
(10) Jitter meter
4.2 Measurement conditons
4.2.1 Radio Input signal
4.2.2 Standard measurement position of volume and
switch
Precautions for measurement
(1) Apply 30pF and 33kΩto the IF sweeper output side and
0.082µF and 100kΩin series to the sweeper input side.
(2) The IF sweeper output level should be made as low as
possible within the adjustable range.
(3) Since the IF sweeper is a fixed device, there is no need
to adjust this sweeper.
(4) Since a ceramic oscillator is used, there is no need to
perform any MIX adjustment.
(5) Since a fixed coil is used, there is no need to adjust the
FM tracking.
(6) The input and output earth systems are separated. In
case of simultaneously measuring the voltage in both of
the input and output systems with an electronic voltmeter
for two channels, therefore, the earth should be connect-
ed particularly carefully.
(7) In the case of BTL connection amp., the minus terminal
of speaker is not for earthing. Therefore, be sure not to
connect any other earth terminal to this terminal. This
system is of an BTL system.
(8) For connecting a dummy resistor when measuring the
output, use the wire with a greater code size.
(9) Whenever any mixed tape is used, use the band pass fil-
ter (DV-12).
Power supply voltage AC 120V ~, 60Hz
Measurement
output terminal
Speaker out
TP101
(Measuring for TUNER/ DECK/CD)
Dummy load 6Ω
AM modulation frequency 400Hz
Modulation factor 30%
FM modulation frequency 1 kHz
Frequency displacement 22.5kHz
Power Standby
(Light STANDBY Indicator)
Sound Turbo,A,BASS EX OFF
Sound mode OFF
Main VOL. 0 Minimum
Travers mecha set position Disc 1

1-20 (No.MB196)
4.3 Arrangement of adjusting positions
4.3.1 Tape recorder section
4.3.2 Tuner section
Cassette deck mechanism
(Front side)
Head azimuth screw
(Forward side)
Head azimuth screw
(Forward side)
Head azimuth screw
(Reverse side)
Head azimuth screw
(Reverse side)
PB Head
(Deck-A)
REC/PB Head
(Deck-B)
Items Measurement
conditions Measurement method Standard
values
Adjusting
positions
1. Playback the test tape VT703 (10KHz) or equivalent.
2. Adjust the head azimuth screw to obtain maximum
output and both output of L / R is in 3dB.
3. Put on the screw lock paint after alignments.
1. Insert the recording tape in deck-B.
2. Starting the recording.
3. Adjust the oscillation frequency to 80KHz+/-3KHz by
core of Oscillation coil of L301.
Test tape
: VT703 (10kHz)
Measurement output
terminal
: Left and Right
speaker output
(6-ohm loaded)
or
Headphone Output
(32-ohm loaded)
Test tape
: TYPE AC-514
Measurement output
terminal
: Erase head terminal
(CN308 8-Pin)
Maximum output
80kHz+/-3kHz
Adjust the
head azimuth
screw only
when the head
has been
changed.
Use the High-
Impedance
Probe or
Frequency
counter input.
Cassette Head
Azimuth Alignments
Recording Bias
Frequency Alignment
Items Measurement
conditions Measurement method Standard
values
Adjusting
positions
1. Set the Signal Generator signal to 530KHz the feed
to Loop Antenna.
2. Receiving the signal and the adjust the OSC coil (L2)
obtain the V.T is 1.40V +/-0.05V.
3. Change the receiving frequency to 600KHz (603KHz).
4. Adjust the Antenna coil ( L2 ) obtain maximum
sensitivity. (Adjust the SSG output to out of AGC range.)
1. Set the receiving frequency to 530KHz.
2. Feed the 450KHz signal to AM antenna input.
3.Adjust the IFT Block T1 obtain to maximum output.
(Adjust the SSG output to out of AGC range.)
Input signal
: 530kHz
600kHz
Adjustment point
: Antenna coil (L2)
Input signal
: 530kHz
Adjustment point
: IFT (T1)
V. T
: 1.40V+/-0.05V
Maximum
sensitivity
Maximum output
Adjust the OSC
coil only when
the AM coil block
has been changed.
Adjust the IFT
only when the
IFT block has
been changed.
AM Tracking
Alignments
AM IFT Alignments
Note: The adjustment of CD section is not required.