JVC UX-P55 User manual

SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. No.22036
2003/4
MICRO COMPONENT SYSTEM
2203620034UX-P55
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
CA-UXP55 SP-UXP55
COMPACT
DIGITAL AUDIO
CD TAPE FM/AM
MICRO COMPONENT SYSTEM UX·P55
CD-R/RW PLAYBACK
MD/AUX
TIMER
CLOCK
STANDBY / ON
STANDBY / ON
VOLUME FUNCTION
SOUND
DIRECT OPERATING
AHB PRO
REV.MODE
PHONES
AUTO REVERSE
REC
/
REC
SLEEP
STANDBY/ON
MD/AUX
FM/AM
TAPE
CD
DISPLAYDIMMER
REPEATRANDOMPROG
FM MODE
AUTO
PRESET
SOUND
MODE
CD
CANCEL MULTI KEY SET
PTY
/EON
DISPLAY
MODE
RM-SUXP5R REMOTE CONTROL
VOLUME
AHB
PRO
SP-UXP55
B ----------------------------- U.K.
E --------- Continental Europe
EN ------------ Norther Europe
Area Suffix

1-2 (No.22036)
SECTION 1
Important Safety Precautions
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 0.5µ
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 expose
d
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

(No.22036)1-3
1.5 Safety Precautions (U.K only)
(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-
tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace-
ment parts must be identical to those used in the original circuits.
(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot
accept responsibility for personal injury or property damage resulting therefrom.
(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never
be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in
the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts
other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts
shown in the Parts List of the Service Manual and 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 re-assembling.
1.5.1 Warning
(1) Service should be performed by qualified personnel only.
(2) This equipment has been designed and manufactured to meet international safety standards.
(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(4) Repairs must be made in accordance with the relevant safety standards.
(5) It is essential that safety critical components are replaced by approved parts.
(6) If mains voltage selector is provided, check setting for local voltage.
Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.

1-4 (No.22036)
1.6 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.
1.6.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
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.
1.7 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.
1.8 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connector CN101 on the CD servo board.
(If the flexible wire is disconnected without applying solder, the CD 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
CN601 on
mechanism
board
Shorting round
Shorting round
Flexible wire

(No.22036)1-5
1.9 Important for laser products
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The compact disc player uses invisible laser
radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open and
the safety interlocks have failed or are de
feated. It is dangerous to defeat the safety switches.
5.CAUTION : If safety switches malfunction, the laser is able
to function.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
REPRODUCTION AND POSITION OF LABEL and PRINT
WARNING LABEL and PRINT
!Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
Caution
Label

1-6 (No.22036)
SECTION 2
Disassembly method
2.1 Main body
2.1.1 Removing the metal cover
(See Fig.1, 2)
(1) Remove the six screws Aon the back of the body.
(2) Remove the two screws Bon the side of the body.
(3) Pull both sides of the metal cover outward and lift the rear
part of the cover.
Fig.1
Fig.2
A
Metal cover
A
A
A
A
Metal cover
B x 2

(No.22036)1-7
2.1.2 Removing the rear cover
(See Fig.3)
• Prior to performing the following procedure, remove the metal
cover.
(1) Remove the two screws Con the back of the body.
Fig.3
2.1.3 Removing the tuner board
(See Fig.4, 5)
• Prior to performing the following procedure, remove the metal
cover.
(1) Disconnect the card wire from connector CN1 on the tuner
board.
(2) Remove the screw Don the right side of the body.
(3) Remove the two screws Eon the rear panel.
(4) Remove the band bundling the wire and pull out the wire
through the hole of the CD-R board.
Fig.4
Fig.5
Rear cove
r
C
C
Rear panel
DTuner board
CD-R board CN 1
Band
Rear cove
r
E
Rear panel

1-8 (No.22036)
2.1.4 Removing the CD-R mechanism assembly
(See Fig.6 ~ 8)
• Prior to performing the following procedure, remove the metal
cover and the rear cover.
(1) Disconnect the card wires from connector CN903, CN904
and the wire from CN905 on the main board on the upper
side of the body.
(2) Remove the screw Dattaching the tuner board and the
CD-R mechanism on the right side of the body.
(3) Remove the two screws Fattaching the rear panel and the
CD-R mechanism on the back of the body.
(4) Move the rear part of the CD-R mechanism assembly up-
wards to disengage the two joints aand release from the
rear panel.
Pull the front panel toward the front and move the rear part
of the CD-R mechanism assembly upwards. Then pull out
the CD-R mechanism assembly from the front panel back-
ward.
REFERENCE:
To remove the CD-R mechanism assembly efficiently, discon-
nect the card wireconnecting the tuner board with the main
board in advance.
2.1.5 Remove the rear panel
(See Fig.8 ~ 11)
• Prior to performing the following procedure, remove the metal
cover, rear cover and the CD-R mechanism assembly.
(1) Remove the seven screws Gattaching the rear panel.
(2) Disconnect the card wire from CN902 on the main board.
(3) Disengage the lower two joints bon each side of the rear
panel using a screwdriver and remove the rear panel back-
ward (The tuner board and the fan will be also de-
tached.Remove them as needed).
2.1.6 Removing the fan
(See Fig.9 ~ 12)
• Prior to performing the following procedure, remove the metal
cover, the rear cover andthe CD-R mechanism assembly.
(1) Disconnect the wire from connector CN908 on the main
board.
(2) Remove the two screws Hon the back of the body.
(3) Move the fan upwards to disengage the four joints cand re-
lease from the rear panel.
Fig.6
Fig.7
Front panel assembly CD-R mechanism assembly
CN904
CN903
Main board
CN905
Tuner board
Rear panel
Card wires
Tuner board
CD-R mechanism
assembly
Front panel assembly
CN 1
Band

(No.22036)1-9
Fig.8
Fig.9
Fig.10
Fig.11
Fig.12
Rear panel
F
G
G
G
Joint a Joint a
G
Fan
CN902
Tuner board
Rear panel
Main board
CN908
Rear panel Joint b
Joint b
Rear panel
Rear panel
HH
Fan
Joint c
Joint c
Joint c
Joint c

1-10 (No.22036)
2.1.7 Removing the power amplifier board / power amplifi-
er sub board / main board / heat sink
(See Fig.13 ~ 21)
• Prior to performing the following procedure, remove the metal
cover, the rear cover, the CD-R mechanism assembly and the
rear panel.
(1) Disconnect the card wire from connector CN900, CN901,
CN933 and CN931 on the main board respectively.
(2) Disconnect the wire from connector CN949, CN950 and
CN951 on the power supply board.
(3) Remove the two screws Ion the right side of the body.
(4) Move the boards and heat sink assembly upwards and dis-
engage the joint dand the two joints eto release the power
amplifier board and the main board from the chassis (Refer
toFig.15 , 16).
Move the rear part of the board and heat sink assembly to
the right side.
CAUTION:
The wire extending from the lower side of the main board
is still connected with the body (Refer to Fig.17).
(5) Disconnect the wire from connector CN906 on the lower
side of the main board (Refer to Fig.18).
2.1.8 Removing the power amplifier board
(See Fig.19 ~ 21)
(1) Disconnect the power amplifier board from connector
CN941 on the power amplifier sub board.
2.1.9 Removing the power amplifier sub board
(See Fig.19 ~ 21)
(1) Disconnect the two wires from connector CN944, CN945,
CN946 and CN947 on the power amplifier sub board.
(2) Remove the two screws Jattaching the power amplifier
sub board and the heat sink.
2.1.10 Removing the main board
(See Fig.19 ~ 21)
(1) Disconnect the wires from connector CN944, CN945,
CN946 and CN947 on the power amplifier sub board.
(2) Remove the two screws Kattaching the main board and
the heat sink.
REFERENCE:
The power amplifier board, the power amplifier sub board, the
main board and the heat sink can be remove drespectively.
Fig.13
Fig.14
Fig.15
Fig.16
CN931 CN901 CN900 Main board
Power supply board CN949 / CN950 / CN951
Front panel assembly
CN933
Main board
CN900
Power supply board
CN949
Front panel assembly
CN950
CN951
CN933
CN931
CN901
Joint e
Main board Front panel assembly
II
Joint d
Chassis
Heat sink
Power amplifier board

(No.22036)1-11
Fig.17
Fig.18
Fig.19
Fig.20
Fig.21
Main board
Heat sink
Power amplifier board
Main board
CN906
Power amplifier sub board
Power amplifier board
Heat sink
Main board
CN944
CN945
CN946
CN947
Power amplifier sub board
CN941
Power amplifier board
Heat sink
Main board
Heat sink
Main board
J
K
Power amplifier board
Power amplifier
sub board

1-12 (No.22036)
2.1.11 Removing the power transformer assembly
(See Fig.22, 23)
• Prior to performing the following procedure, remove the metal
cover, the rear cover, the CD-R mechanism assembly and the
rear panel.
• Remove the assembly consisting of the power amplifier board,
the power amplifier sub board and the main board fromthe
chassis incompletely (Refer to Fig.17).
(1) Remove the cord stopper upwards on the back of the body.
(2) Disconnect the power cord from connector J1000 on the
board of the power transformer assembly.
(3) Remove the four screws Lattaching the power transform-
er assembly.
Fig.22
Fig.23
Cord stopper
Power cord
J1000
Power transformer assembly
LL
J1000
Cord stopper
Power cord
Power transformer assembly

(No.22036)1-13
2.1.12 Removing the front panel assembly
(See Fig.24, 25)
• Prior to performing the following procedure, remove the metal
cover, the rear cover, the CD-R mechanism assembly and the
rear panel.
• Remove the assembly consisting of the power amplifier board,
the power amplifier sub board and the main board (Refer to
Fig.17, 18).
(1) Remove the two screws Mon each lower side of the body.
(2) Disengage the two joints fon each lower side of the body
using a screwdriver andpull out the front panel assembly
toward the front.
Fig.24
Fig.25
M
Front panel assembly
Joint c
M
Front panel assembly
Joint c

1-14 (No.22036)
2.1.13 Removing the display board / switch board
(See Fig.26 ~ 28)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Pull out the VOLUME knob on the front panel.
(2) Remove the eleven screws Non the back of the front panel
and remove the display board with the switch board.
(3) Remove the three screws Oattaching the switch board to
the LCD holder.
(4) If necessary, unsolder the wire connected to connector
FW931 on the display board and FW931 on the switch
board.
Fig.26
Fig.27
Fig.28
Front panel assembly
VOLUME knob
N
N
N
N
NN
Switch board
Display board
O
Switch board
Display board
FW931

(No.22036)1-15
2.1.14 Removing the headphone board
(See Fig.29)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the screw Pon the back of the front panel.
(2) If necessary, remove the band bundling the wire extending
from the headphone board and the display board.
2.1.15 Removing the cassette mechanism assembly
(See Fig.29, 30)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Press the EJCT button on the front panel to open the cas-
sette door.
(2) Remove the four screws Qon the back of the front panel.
2.1.16 Removing the LED board
(See Fig.30 ~ 32)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Press the EJCT button on the front panel to open the cas-
sette door.
(2) Remove the cassette holder in the direction of the arrow.
(3) Release the two joint hooks gengaging the LED board with
the cassette door.
Fig.29
Fig.30
Fig.31
Fig.32
Q
Q
P
Headphone board
Display board
Cassette mechanism assembly
Front panel assembly
Cassette door
EJCT button
Cassette door holder
LED board
Hooks g
Cassette door

1-16 (No.22036)
2.2 Cassette mechanism assembly
2.2.1 Removing the playback/recording & eraser head
(See Fig.1 to 3)
(1) While shifting the trigger arm seen on the right side of the
head mount in the arrow direction, turn the flywheel (R) in
counterclockwise direction until the head mount has gone
out with a click (See Fig.1).
(2) When the flywheel (R) is rotated in counterclockwise direc-
tion, the playback/recording &erase head will be turned in
counterclockwise direction from the position in Fig.2 to that
in Fig.3.
(3) At this position, disconnect the flexible wire (outgoing from
the playback/recording &erase head) from the connector
CN31 on the head amplifier & mechanism control board.
(4) Remove the flexible wire from the fixing point bon the
chassis base.
(5) Remove the spring a from behind the playback/recording
&erase head.
(6) Loosen the reversing azimuth screw Aretaining the play-
back/recording &erase head.
(7) Take out the playback/recording &erase head from the
front of the head mount.
2.2.2 Reassembling the playback/recording & eraser head
(1) Reassemble the playback/recording & eraser head from
the front of the head mount to the position as shown in
Fig.3.
(2) Fix the reversing azimuth screw A.
(3) Attach the spring a from behind the playback/recording &
eraser head.
(4) Attach the flexible wire to the fixing point bon the chassis
base.
(5) Attach the flexible wire (outgoing from the playback/record-
ing & eraser head) to the connector CN31 on the head am-
plifier & mechanism control board.
Fig.1
Fig.2
Fig.3
fly wheel(R)
trigger arm
Head (R/P,Erase)
Flexible wire spring a
CN31
fixing point b
Head amp & Mecha
control board
head mount
REV
azimuth screw
Head (R/P,Erase)
flexible wire
spring a
CN31
fixing point b
Head amp & mechanism
control board
A
belt
CN32
CN31
Main motor
assembly
Main moto
r
assembly
Head amp & Mechanism
control board
flexible wire 4pin flat wire
BB
B
C
C

(No.22036)1-17
2.2.3 Removing the head amplifier & mechanism control
board
(See Fig.4 and 5)
(1) Remove the flexible wire from the connector CN31 on the
head amplifier & mechanism control board on the rear of
the cassette mechanism assembly.
(2) Remove the three screws Bretaining the head amplifier &
mechanism control board.
(3) Disconnect the connector CN 32 on the head amplifier &
mechanism control board from the connector CN1 on the
reel pulse board, and remove the head amplifier & mecha-
nism control board.
Note:
When necessary, remove the 4 pin parallel wire soldered to
the main motor.
2.2.4 Removing the main motor
(See Fig.4 to 7)
• Prior to the following procedure, it is not necessary to remove
the head amplifier & mechanism control board.
(1) Remove the two screws Cretaining the main motor.
(2) While raising the main motor, remove the capstan belt from
the motor pulley.
CAUTION:
Be sure to handle the capstan belt so carefully that this belt will
not be stained by grease and so on. Moreover, this belt should
be hanged while referring to the capstan belt hanging method
in Fig. 6 and 7.
Fig.4
Fig.5
Fig.6
Fig.7
main motor assembly
capstan belt
motor pully
main motor assembly
capstan belt
motor pully
main motor assembly
capstan belt
fly wheel
motor pully
capstan shaft (L)
fly wheel (L)
capstan
shaft (R)
fly wheel (R)
slit washer d slit washer c

1-18 (No.22036)
2.2.5 Removing the flywheel
(See Fig.8 and 9)
• Prior to the following procedure, remove the head amplifier
&mechanism control board.
• Prior to the following procedure, remove the main motor as-
sembly.
(1) Remove the slit washers c and d fixing the capstan shafts
(L) and (R) from the front of the cassette mechanism as-
sembly. And pull out the flywheels (L) and (R) respectively
from the rear of the cassette mechanism assembly in the
arrow direction. Then, remove the flywheels (L) and (R).
Fig.8
Fig.9
2.2.6 Removing the reel pulse board and solenoid
(See Fig.10)
• Prior to the following procedure, remove the head amplifier &mechanism control board.
• Prior to the following procedure, remove the main motor assembly.
(1) Remove one screw Dattaching the reel pulse board.
(2) Remove the five fixing points eattaching the reel pulse board respectively in the arrow direction.
(3) From the front of the cassette mechanism assembly, push the two fixing points fretaining the solenoid in the arrow direction,
and remove the solenoid.
Note:
When reassembly, make sure that the fixing point gof the solenoid is attached properly.
Fig.10
fly wheel (L)fly wheel (R)
Cassette mechanism
Fly wheel(R)
Trigger arm
Head mount
Reel pulse board
solenoid
z
fixing point f
fixing point g
fixing point e fixing point e fixing point e

(No.22036)1-19
SECTION 3
Adjustment
3.1 Adjustment method
Tuner section
FM tuning range: 87.5MHz~108.00MHz
AM tuning range: 522kHz~1,629kHz
Voltage applied to tuner +B : DC5.7V
VT : DC 12
V
Reference measurement
output 26.1mV(0.28V)/3
Input positions AM : Standard loop antenna
FM : TP1 (hot) and TP2 (GND)
Standard measurement position of volume
Function switch to Tape
Beat cut switch to Cut
Super Bass/Active hyper Bass to OFF
Bass Treble to Center
Adjustment of main volume to reference output
VOL : 28
Precautions for measurement
1. Apply 30pF and 33k to the IF sweeper output
side and 0.082 F and 100k in 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 connected 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 filter (DV-12).
Measurement conditions
Power supply voltage
AC 230V ~ , 50Hz
Reference output : Speaker : 0.775V/4
: Headphone : 0.077V/32
Reference frequency and
input level ------------------------------ 1kHz, AUX : -8dBs
Measurement output terminal ------- at Speaker J3002
Load resistance --------------------------- 4
Radio Input signal
AM frequency --------------------------------------- 400Hz
AM modulation ---------------------------------------- 30%
FM frequency --------------------------------------- 400Hz
FM frequency deviation ------------------------ 22.5kHz
Measurement Instruments Required for
Adjustment
1. Low frequency oscillator
This oscillator should have a capacity to output
0dBs to 600 at an oscillation frequency of
50Hz-20kHz.
2. Attenuator impedance : 600
3. Electronic voltmeter
4. Distortion meter
5. Frequency counter
6. Wow & flutter meter
7. Test tape
VT703L : Head azimuth
VT712 : Tape speed and running unevenness
(3kHz)
VT724 : Reference level (1kHz)
8. Blank tape
TYPE : AC-225
TYPE : AC-514
9. Torque gauge : For play and back tension
FWD(TW2111A), REV(TW2121a) and
FF/REW(TW2231A)
10. Test disc: CTS-1000

1-20 (No.22036)
3.2 Cassette mechanism section
Recording and play head/Erase head
Head angle
azimuth screw
(foward)
Head angle
azimuth screw
(reverse)
Head angle
azimuth screw
(foward)
Head angle
azimuth screw
(reverse)
C202
C376
C103
C121
C106
C305
C108
C109
C107
C308
R203
C302
C203
R109
C206
R104
C209
C113
R209
C207
C301
C310
C303
C304
C208
C331
C313
R116
R204
C316
B106
C319
R103
C375
61
CN31
B158
70u FRE PLA PHO 5V MG SOL RRE TAP NC
110
CN32
91IC31
8 9
IC32
1
16
16
18
9
IC33
L301
Q101
Q201
Q305
Q302
B168
C334
B
Q375
E
Q376
Q371
B
E
C201
R101
R102 C104
R105
R106
R107
R108
C221
R110 R111
R112
R121
R201
R202
C204
R205
R206
R207
R208
C111
R210
R211
R212
R221
R301
R303
R304
B167
R335
R315 R314
R313
R310
R122
Q103
R305
B151
R371
R375
R376
R372
R338 R337
R341
R342
R343
R339
R336
R331
VR31 VR37
C210
C110
C102 C101
Q372
C213
C211
R215
D375
R115
R340
Q331
B113
R345
9
CN33
1
1
CN34
MS
MB
PBR
AG
PBL
SW8V
RECR
AG
RECL
MG
10
R327
C306
R216
C371
B153
B152
B162
C374
R222
B102
B200
B101
Q203
B110
B109B108
B164
B161
B163
R353
B155
C317
C314
L303
R373
B157
B159
B156
B160
B112
C307
B166
Q321
B198
C105
C205
C332 C333
Motor speed
VR37
BIAS adjustment
VR31
Mechanism control P.C. board
CN31