JVC RS-WP1WT User manual

SERVICE MANUAL
CD PORTABLE SYSTEM
No.20943
May. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
RS-WP1WT
RS-WP1WT
Contents
Safety Precautions
Important for laser products
Preventing static electricity
Disassembly method
Adjustment method
Flow of functional
operation unit Toc read
Maintenance of laser pickup
Replacement of laser picup
Description of major ICs
1-2
1-3
1-4
1-5
1-17
1-21
1-22
1-22
1-23
SLEEP
CLOCK TIMER
TIMER
ON/OFF
PROGRAM
RANDOM
REPEAT
BAND
DISPLAY
AHB PRO
REVERSE MODE
MULTI CONTROL
FM MODE
REW FF
RM-SRSWP1J REMOTE CONTROL
TAPE TUNER C D
DOWN UP SET
AUX
VOLUME
BASS/
TREBLE
STANDBY/ON
AUTO
PRESET
V
O
L
U
M
E
V
O
L
U
M
E
A
U
X
T
U
N
E
R
T
A
P
E
C
D
A
S
P
S
P
L
A
S
H
R
E
S
I
S
T
A
N
T
A
N
T
I
-
S
H
O
C
K
P
R
O
T
E
C
T
I
O
N
O
P
E
N
O
N
E
T
O
U
C
H
R
E
C
M
U
L
T
I
C
O
N
T
R
O
L
REW FF
STANDBY
CD PORTABLE SYSTEM RS-WP1
BAND
STANDBY/ON
A
.
P
.
O
F
F
Areas suffix
J --------------------------
U.S.A

RS-WP1WT
1-2
1. This design of this product contains special hardware and many circuits and components specially for safety
purposes. 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 performed 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 manufacturer`s 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
characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily
be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in the Parts List of Service 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 characteristics
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 re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the product
(antenna 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, particularly any exposed metal part having a return
path to the chassis, to a known good earth ground. Any leakage current 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, 1,000 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor
between an exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to eachexposed metal part,
particularly any exposed metal part having a return path to
the chassis, and meausre 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. 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.
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
!
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.
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.
(Except the J and C version)

RS-WP1WT
1-3
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
laserradiation and is equipped with safety switches
whichprevent 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.
VARNING : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.
ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion. Undgå
udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngå utsettelse
for stråling.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
DANGER : Invisibie laser radiation
when open and interlock or
defeated.
AVOID DIRECT EXPOSURE TO
BEAM (e)
VARNING : Osynlig laserstrålning är
denna del är öppnad och spårren är
urkopplad. Betrakta ej strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettaessa olet alttiina
näkymättömälle lasersäteilylle.Älä
katso säteeseen. (d)
ADVARSEL :Usynlig laserstråling
ved åbning , når
sikkerhedsafbrydere er ude af
funktion. Undgå udsættelse for
stråling. (f)
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CLASS 1
LASER PRODUCT

RS-WP1WT
1-4
Preventing static electricity
1.Grounding to prevent damage by 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.
2.About the earth processing for the destruction prevention 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.
2-1 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.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
3. Handling the optical pickup
1. 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.)
2. 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.
4.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. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
CN611
Short circuit land
Prior to disconnecting the flexible wire
extending from the pickup, solder it to the
short circuit land to prevent damage to the
pickup.
CAUTION:

RS-WP1WT
1-5
Remove the nine screws Aattaching the rear panel
assembly on the back of the body.
Pull out the front panel assembly and the rear panel
assembly. Disconnect the speaker terminal on the
front side and connector CN112 on the connection
board on the rear side at the same time.
1.
2.
Disassembly method
Removing the front panel assembly /
rear panel assembly (See Fig.1)
Prior to performing the following procedures, remove
the rear panel assembly.
Disconnect the card wire from connector CN614 and
the wire from CN624 on the CD mechanism
assembly respectively.
Remove the three screws Battaching the CD
mechanism assembly section.
1.
2.
Removing the CD mechanism assembly
section (See Fig.2)
Prior to performing the following procedures, remove
the rear panel assembly and the CD mechanism
assembly section.
Disconnect the card wire from connector CN33,
CN34 on the cassette mechanism assembly.
Remove the four screws Cand the cassette
mechanism assembly with the wire cover.
1.
2.
Removing the cassette mechanism
assembly (See Fig.3)
Fig.1
Fig.2
Fig.3
A
A
A
A
AA
Connection board
CN112 Rear panel
assembly
BB
B
CN624
CN614
CD mechanism
assembly section
Cassette mechanism assembly
CN33 CN34
C
C
C
Cassette mechanism
assembly Wire cover

RS-WP1WT
1-6
Prior to performing the following procedures, remove
the rear panel assembly.
Disconnect the card wire from connector CN921 on
the function switch board.
Remove the two screws Dand move the function
switch board in the direction of the arrow to
disengage the two joints a.
1.
2.
Removing the function switch board
(See Fig.4)
Prior to performing the following procedures, remove
the rear panel assembly.
Remove the LCD spare board while pulling each
joint hook boutward.
Pull out the LED board.
If necessary, unsolder FW925 soldering the wire on
the LED board.
1.
2.
Removing the LCD spare board / LED
board (See Fig.5 and 6)
Fig.5
Fig.6
Fig.4
D
Joint a
Joint a
Function switch board
CN921
LCD board
Joint hook b
Joint hook b
LCD board
LCD spare board
LED board
FW925

RS-WP1WT
1-7
Prior to performing the following procedures, remove
the rear panel assembly and the function switch
board.
Remove the four screws Eattaching the bracket.
Disconnect the card wire from connector CN421,
CN422 and the wire from CN913 on the LCD board
respectively.
Disconnect the wire from connector CN624 on the
CD mechanism assembly.
Remove the two screws F attaching the LCD board
(The LCD spare board and the LED board are still
attached to the LCD board).
1.
2.
3.
4.
Removing the LCD board
(See Fig.7 and 8)
Prior to performing the following procedures, remove
the rear panel assembly.
Remove the two screws Gattaching the headphone
jack board bracket.
Pull out the headphone jack board bracket and the
headphone cover at the same time.
Remove the two screws Hattaching the headphone
jack board.
Disconnect the wire from connector CN711 on the
headphone jack board.
1.
2.
3.
4.
Removing the headphone jack board
(See Fig.9 and 10)
Fig.7
Fig.8
Fig.9
Fig.10
LCD board
E
E
Bracket
LCD board
CN913
F
FCN421
CN422
CN624
Headphone jack bracket
Headphone cover
G
G
Headphone jack board
CN711
H

RS-WP1WT
1-8
Prior to performing the following procedures, remove
the rear panel assembly, the CD mechanism
assembly section and the LCD board.
Remove the two screws Jattaching the main board
on the back of the rear panel assembly.
Disconnect the card wire from connector CN43 and
CN44 on the main board on the inside of the rear
panel assembly.
Disconnect the wire from connector CN101 and
CN103 on the power board.
Disconnect the wire from connector CN401 on the
battery board.
Remove the six screws Kattaching the main board.
Disconnect the card wire from connector CN91 on
the reverse side of the main board.
Remove the screw Land disconnect the sub (1)
board from connector CN341 on the main board.
Disconnect the sub (2) board from connector CN371
on the main board.
1.
2.
3.
4.
5.
6.
7.
Removing the main board / sub (1) board
/ sub (2) board (See Fig.11 to 13)
Fig.11
Fig.12
Fig.13
Rear panel assembly
J
KK
CN44
CN91
CN43
Power board
K
Main board
K
CN103
CN101
Battery board
CN401
LSub (1) board
CN341
Sub (2) board
CN371
Main board

RS-WP1WT
1-9
Prior to performing the following procedure, remove
the rear panel assembly.
Remove the screw Mattaching the remocon board
and disconnect the wire from connector CN913 on
the LCD board.
1.
Removing the remocon board
(See Fig.14)
Prior to performing the following procedures, remove
the rear panel assembly.
Disconnect the card wire from connector CN1 and
the antenna wire from TP1 on the tuner board
respectively.
Remove the four screws Nattaching the tuner
board.
1.
2.
Removing the tuner board (See Fig.15)
Fig.14
Fig.15
Remocon board
M
LCD board
CN913
Tuner board
CN1
TP1 Antenna wire
N
N

RS-WP1WT
1-10
Prior to performing the following procedures, remove
the rear panel assembly.
Disconnect the wire from connector CN101, CN102
and CN103 on the power board.
Remove the four screws Oattaching the power
board.
Remove the three screws O’ attaching the heat sink.
Disengage the two joints cand remove the heat sink
from the power board.
1.
2.
3.
4.
Removing the power board
(See Fig.16 to 18)
Fig.16
Fig.17
Fig.18
O
O
O
Power board
CN103
CN101
CN102
O’
Joint c
Joint c
Power board
Heat sink

RS-WP1WT
1-11
Prior to performing the following procedures, remove
the rear panel assembly.
Disconnect the wire from connector CN102 on the
power board.
Remove the two screws Pand pull out the
connection board.
1.
2.
Removing the connection board
(See Fig.19)
Prior to performing the following procedures, remove
the rear panel assembly.
Remove the battery cover on the back of the rear
panel assembly.
Remove the two screws Qretaining the battery
board (1).
Pull out the battery board (1) and disconnect the wire
from inner connector CN401.
Remove the two screws Rand pull out the battery
board (2).
1.
2.
3.
4.
Removing the battery board (1) / battery
board (2) (See Fig.20 and 21)
Fig.19
Fig.20
Fig.21
P
P
Connection board
CN112
Battery cover
CN401
Battery board (1) Battery board (2)
R
Q

RS-WP1WT
1-12
Release the three joint hooks dretaining the CD
mechanism cover.
Disconnect the wire from connector CN612 on the
CD servo board.
Remove the CD mechanism assembly from the three
dampers.
Solder the flexible wire connected to connector
CN611 on the CD servo board to the short circuit
land under the flexible wire.
After soldering, disconnect the pickup wire from
connector CN611.
1.
2.
3.
4.
Removing the CD mechanism assembly
(See Fig.22 to 26)
Prior to disconnecting the flexible wire
extending from the pickup, solder it to the
short circuit land to prevent damage to the
pickup.
CAUTION:
Prior to performing the following procedures, remove
the rear panel assembly and the CD mechanism
assembly section.
<CD mechanism assembly section>
When reassembling, connect the pickup
wire extending from the pickup to
connector CN611 on the CD servo
board. Then unsolder the wire soldered
to the short circuit land.
CAUTION:
Fig.22
Fig.23
Fig.24
Fig.25Fig.26
CD mechanism cover
Joint hook d
Joint hook d
Joint hook d
CD mechanism cover
CD servo board
Damper
Damper
Damper
CD servo assembly
CN612
CN611
CD mechanism assembly
(Pickup)
CD mechanism board
Pickup wire
(Short circuit land)
CN611
Short circuit land

RS-WP1WT
1-13
Prior to performing the following procedure, remove
the CD servo assembly.
Remove the four screws Sretaining the CD servo
board.
Unsolder FW616 where the wire extending from the
OPEN / CLOSE switch board is soldered.
1.
2.
Removing the CD servo board
(See Fig.27)
Prior to performing the following procedure, remove
the CD mechanism cover.
Remove the screw Tretaining the OPEN / CLOSE
switch board.
Unsolder FW626 where the wire extending from the
CD mechanism board is soldered.
1.
2.
Removing the OPEN / CLOSE switch
board (See Fig.27)
Prior to performing the following procedure, remove
the front assembly.
Remove the four screws Uattaching the speaker
assembly (R).
Remove the four screws V attaching the speaker
assembly (L).
Remove the screw Wattaching the speaker terminal.
If necessary, disconnect the wire from each speaker
terminal.
1.
2.
3.
Removing the speaker assembly (R) and
(L) (See Fig.28)
Prior to performing the following procedure, remove
the front assembly.
Remove the four screws Xattaching the sub speaker
assembly (R).
Remove the four screws Yattaching the sub speaker
assembly (L).
If necessary, disconnect the wire from each speaker
terminal.
1.
2.
Removing the sub speaker assembly (R)
and (L) (See Fig.28)
<Front assembly>
Fig.27
Fig.28
OPEN / CLOSE
switch board
FW626 FW616
CD mechanism board
S
S
S
S
T
Sub speaker assembly (R) Sub speaker assembly (L)
Speaker assembly (R) Speaker assembly (L)
Y
X
W
U
V
U
V
X
Y
Speaker
terminal

RS-WP1WT
1-14
Cassette mechanism
Flywheel R
Trigger armHead mount
Fig. 1
Fig. 2
Playback / Recording &
eraser head
Flexible
board
Spring 1
Trigger arm
Head amplifier & mechanism
control P.C. board
Flywheel R
Fig. 3
Playback / Recording &
eraser head
Reversing azimuth
screw
Head
mount
Flexible
board
Spring 1
Head amplifier &
mechanism control
P.C. board
CN31
<Cassette mechanism section>
While shifting the trigger arms 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).
When the flywheel R is rotated in counterclockwise
direction, the playback / recording & eraser head will
be turned in counterclockwise direction from the
position in Fig. 2 to that in Fig. 3.
At this position, disconnect the flexible P.C. board
(outgoing from the playback / recording & eraser
head) from the connector CN31 on the head
amplifier & mechanism control P.C. board.
Remove the flexible P.C. board from the chassis
base.
Remove the spring 1 from behind the playback /
recording & eraser head.
Loosen the reversing azimuth screw retaining the
playback / recording & eraser head.
Take out the playback / recording & eraser head from
the front of the head mount.
The playback / recoring & eraser head should also
be removed similarly according to steps 1 to 7 above.
1.
2.
3.
4.
5.
6.
7.
8.
Removing the playback / recording &
eraser head (See Fig. 1 to 3)
Reassemble the playback head from the front of the
head mount to the position as shown in Fig. 3.
Fix the reversing azimuth screw.
Set the spring 1from behind the playback / recording
& eraser head.
Attach the flexible P.C. board to the chassis base, as
shown in Fig. 3.
The playback / recording & eraser head should also
be reassembled similarly to step 1 to 4 above.
1.
2.
3.
4.
5.
Reassembling the playback / recording &
eraser head (See Fig.3)

RS-WP1WT
1-15
Belt
Main motor
assembly
Head amplifier &
mechanism control
board
Flexible board
4pin parallel wire
Main
motor
assembly
Fig. 4
Fig. 4a
Main motor
assembly
Capstan belt
Motor
pulley
Fig. 6
Main motor
assembly
Flywheel
Motor pulleyCapstan belt
Fig. 5
Mechanism motor
assembly
Motor
pulley
Capstan
belt
CN32
CN31
A
A
A
B
B
Remove the cassette mechanism assembly.
Disconnet the flexible wire from connctor CN31 to
the flexible board.
After turning over the cassette mechanism assembly,
remove the three screws Aretaining the head
amplifier & mechanism control board.
Disconnect the connector CN32 on the board
including the connector CN 1 on the reel pulse P.C.
board.
When necessary, remove the 4 pin parallel wire
soldered to the main motor.
1.
2.
3.
4.
5.
Removing the head amplifier & mechanism
control board (See Fig. 4)
Remove the two screws Bretaining the main motor
assembly (See Fig. 4 and 4a).
While raising the main motor, remove the capstan
belt from the motor pulley (See Fig. 4a).
1.
2.
Removing the main motor assembly
Be sure to handle the capstan belt so
carefully that this belt will not be stained
by grease and other foreign matter.
Moreover, this belt should be hanged
while referring to the capstan belt
hanging method in Fig. 5 and 6.
CAUTION:

RS-WP1WT
1-16
Flywheel R Flywheel L
Capstan shaft R Capstan shaft L
Slit
washer 1
Slit
washer 1
Fig. 8
Flywheel R Flywheel L
Fig.10
Reel pulse board
Mecha braket assembly
Fig. 7
Fig. 9
Solenoid
a b c d e
fg
Remove the head amplifier & mechanism control P.C.
board.
Remove the main motor assembly.
After turning over the cassette mechanism, remove
the two slit washers 1 and fixing the capstan shafts R
and L, and pull out the flywheel R and L respectively
from behind the cassette mechanism.
1.
2.
3.
Removing the flywheel (See Fig. 7 and 8)
Remove the screw C attaching the mecha braket
assembly on the cassette assembly.
Remove the screw D attaching the reel pulse board.
Remove the five pawls a to ereattaining the reel
pulse board.
From the surface of the reel pulse board parts,
remove the two pawls f and gretaining the solenoid.
1.
2.
3.
4.
Removing the mecha braket reel pulse
P.C. board and solenoid (See Fig. 9 and
10)
C
D

RS-WP1WT
1-17
Adjustment method
Measuring devices necessary for adjustment
1. Low-frequency oscillator
It must have the ability to output 600ohm from 0 dBs
at an oscillation frequency of 20 Hz-50 Hz.
2.Attenuator impedance: 600ohm
3.Electronic voltmeter
4.Distortion meter
5.Frequency counter
6.Wow and flutter meter
7.Test tapes
VT-712: tape speed and rotational distortion (3 kHz)
VT-724: standard level (1 kHz)
VT-703: head angle adjustment (10 kHz),
or use VT-73
VT-739: reproduction of frequency characteristics
(1 kHz, 63 Hz, 10 kHz)
8.Blank tape
Type I : AC-225 (TDK-AD)
Type II : AC-514 (TDK-SA)
9.Torque gauge: Tension gauge for playback,
fast-forward and rewind.
FWD (TW211A), REW (TW212A)
and FF/REW (TW2231A)
Specifications for measurement
Power supply voltage ................... AC 230 V (50 Hz)
Standard output ........................ Speaker: 0.775V/4ohm
Headphone:0.245V/32ohm
Standard frequency and input level
................... 1 kHz: AUX: -8 dBs
Input level for reproduction of recording characteristics
................... AUX: -28 dBs
Measuring output terminal ................... Speaker: CN112
Load resistance .................................................... 4ohm
Radio input signal
AM frequency ..................................................... 400 Hz
Degree of modulation in AM band .......................... 30%
FM frequency ...................................................... 400 Hz
Frequency deviation in FM band ..................... 22.5 kHz
Tuner section
Voltage input to the tuner .......................... +B: DC 5.7 V
VT: DC 12 V
Standard measuring output ....... 26.1 mV (0.28 V)/3ohm
Input locations ..................... AM: standard loop antenna
FM: TP1 (hot) and TP2 (GND)
Standard settings for measuring volume
Sound ..................................................................... OFF
Effective hyper bass ............................................... OFF
Volume adjustment ........................................... VOL. 23
Precautions for measuring
1.Input 30 pF and 33 kohm to the IF sweeper output
and 0.082 F and 100 kohm to the sweeper input,
respectively.
2.Lower the output level of the IF sweeper as much as
possible in the adjustable range.
3.The IF sweeper needs no adjustment as it is a fixed
component.
4.It is not necessary to perform any kind of adjustment
on the MPX, as a ceramic oscillator is used for
measuring.
5.FM tracking adjustment is not necessary as a fixed
coil is used.
6.The grounding circuit is separate from the input and
output. Therefore, be sure to connect to ground
carefully when measuring both the input and output
voltages simultaneously using 2 channels of the
electronic voltmeter.
7.The speaker's minus terminal cannot be connected to
ground when using a BTL format amplifier. Therefore,
do not connect any type of ground wire to this
terminal. The OTL format is used with this system.
8.Use a large wire to connect to the dummy impedance
generator when measuring the output.
9.Be sure to use a band pass filter (DV-12) when using
mixed tape.

RS-WP1WT
1-18
CN31
Location of parts to be adjusted
Cassette handling mechanism Cassette handling mechanism (reverse side)
Location of parts to be adjusted
Head for recording, playing
and erasing the tape
Head azimuth
adjusting screw (fast-forward)
Head azimuth adjusting
screw (rewind)
Head azimuth adjusting
screw (fast-forward) Head azimuth adjusting
screw (rewind)
Head for recording,
playing and erasing the tape
VR37
Motor speed
TP
Bias oscillation frequency (wide pattern)
L301
Bias oscillation frequency
VR31
Lch recording frequency (bias adjustment)
VR32
Rch recording frequency (bias adjustment)

RS-WP1WT
1-19
Adjustment of cassette handling mechanism
Items Condition Method for adjustment
and confirmation Standard value Parts to be adjusted
Confirmation
of head angle
Test tape: VT-703 (10 kHz)
Measuring output terminal:
Speaker terminal, speaker (R)
(Load resistance: 4ohm),
headphone terminal
(1) Play back the VT-703 test tape.
(2) Adjust the head azimuth screws so
that the tape playback mechanism
records the maximum output level in
both the fast-forward and rewind
direction.
(3) In all cases, both the fast-forward and
rewind direction should be adjusted
using head azimuth screws.
Maximum
output
Adjust the
head
azimuth
screws
when
changing
the head.
Confirmation
of tape speed
Test tape: VT-712 (3 kHz)
Measuring output terminal:
Headphone terminal
Adjust VR37 so that the frequency
counter records 3,015 Hz 15 Hz when
playing back the end of the VT-712 test
tape (3 kHz) in the fast-forward direction.
Tape speed
of cassette
deck: 3,015
Hz 15 Hz
VR37
Items to be confirmed and standard values
Items Condition Method for adjustment
and confirmation Standard value Parts to be adjusted
Difference in
speed
between fast-
forward and
rewind
Test tape: VT-712 (3 kHz)
Measuring output terminal:
Speaker terminal, speaker (R)
(Load resistance: 4 ),
headphone terminal
The difference between fast-forward and
rewind should be less than 60 Hz on the
frequency counter when playing back the
beginning of the VT-712 test tape (3 kHz)
in both directions.
Less than 60
Hz
Should be
confirmed
when
changing
the motor.
Wow and
flutter
Test tape: VT-712 (3 kHz)
Measuring output terminal:
Headphone terminal
Wow and flutter should be recorded at
less than 0.25% (WRMS) when playing
back the VT-712 test tape (3 kHz) in the
fast-forward direction.
Less than
0.25%
(WRMS)
Electronic performance
Items Condition Method for adjustment
and confirmation Standard value Parts to be adjusted
Confirmation
of output
Measuring output terminal:
CN34-5 or 7-terminal
preamp base
Test tape: VT-724
Confirm that the output from the CN34-5
or 7-terminal preamp base connector is -
25 dBs 3 dB when playing back the VT-
724 test tape.
Reference value: The output from the
headphone terminal is -7 dB 4 dB.
Output of CN34-
5 terminal: -25
dBs 3 dB
Difference
between Lch
and Rch: within
3 dB
Confirmation
of
reproduction
of frequency
characteristic
s
Measuring output terminal:
Headphone terminal
Test tape: VT-739
Confirm that the 10 kHz reproduction
level is -1 dB 5 dB compared to the 1
kHz reproduction level when playing back
the VT-739 test tape.
Difference
between 10
kHz and 1 kHz
should be -1
dB 5 dB.
Recording
bias
frequency
Fast-forward or rewind
direction:
Test tape: TYPE II (AC-
514)
Measuring terminal: Bias
TP on the base
Switch the bias (beat cut switch) between
1 and 2 to confirm that the frequency
changes. Load the test tape (AC-514 for
TYPE II) into the mechanism and preset
it to the record-pause mode.
Confirm that the bias TP frequency on
the base is 100 kHz 6kHz.
100 kHz 6 kHz

RS-WP1WT
1-20
Standard values for confirmation of electronic performance
Items Condition Method for adjustment
and confirmation Standard value Parts to be adjusted
Erasing
current
(standard
and
reference
value)
Fast-forward and
rewind direction:
Recording mode
AC-514 for TYPE II,
AC-225 for TYPE I
Measuring terminal:
Both erase head ter-
minals
Load the test tape (AC-514 for TYPE II,
AC-225 for TYPE I) into the tape
playback mechanism and preset it to the
record-pause mode.
After setting it to the recording mode,
send 1 M in series to the erase head and
measure the erasing current from both
erase head terminals.
TYPE II: 110
mA
TYPE I: 75 mA
Adjustment of
reproduction
of frequency
characteristic
s
Standard frequencies:
1 kHz and 10 kHz
(REF: -20 dB)
Test tape: TYPE II:
AC-514
Measuring input
terminal: OSC IN
Load the test tape (AC-514 for TYPE II,
AC-225 for TYPE I) into the tape
playback mechanism and preset it to the
record-pause mode.
Input the standard value of -20 dB and
the standard frequencies of 1 kHz and 10
kHz repeatedly to the microphone input
from the transmitter in the recording
mode. Adjust VR31 for Lch and VR32 for
Rch so that the difference in level
between 10kHz and 1 kHz is -1dB 5dB.
Repeat the above for TYPE I and confirm
that the difference in level is -XdB dB.
Difference in
output
between 1 kHz
and 10 kHz: -1
dB 5 dB
Lch: VR31
Rch: VR32