Sony XR-6450RDS User manual

XR-6450RDS
SERVICE MANUAL AEP. Model
UK Model
RELEASE
Model Name Using Similar Mechanism XR-C510RDS
Tape Transport Mechanism Type MG-50EX-39
SPECIFICATIONS
Cassette player section General
Tape track 4-track 2-channel stereo Output lead Power antenna relay
Wow and flutter 0.08 % (WRMS) control lead
Frequency response 30 - 15,000 Hz Power amplifier control
Signal-to- noise ratio 55 dB lead
Tone controls Bass £8 dB at 100 Hz
Tuner section Treble +8 dB at 10 kHz
EM Power requirements 12 V DC car battery
: 2 (negative ground)
Tuning range 87.5 — 108.0 MHz Dimensions Approx. 188 x 58 x 176 mm
Antenna terminal External antenna connector (w/h/d)
Intermediate frequency 10.7 MHz Mounting dimension — Approx. 182 x 53 x 155 mm
Usable sensitivity 8 dBf (w/h/d)
Selectivity — 75 dB at 400 kHz Mass Approx. 1.2 kg
Signal-to-noise ratio 65 dB (stereo), Supplied accessories Power connecting cord (1)
aa
68
dB
(mono)
Mounting
hardware
(1
set)
Harmonic
distortion
at
1
kHz
Front
panel
case
(1)
0.5 % (stereo),
oo
Ssaradon - dB ae Sade and specifications are subject to change without
Frequency response 30 ~ 15,000 Hz ,
Capture ratio 2dB
MW/LW
Tuning range MW: 531 ~ 1,602 kHz
LW: 153 ~ 281 kHz
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity MW: 30 pV
: LW: 50 pV
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4-8 ohms
Maximum power output 15 W x 4 (at 4 ohms)
FMIMW/LW CASSETTE CAR STEREO
SONY.

Section Title Page
1. GENERAL
Location of Controls Pome m meee e sero esse aera e ss eeeesrserseeressoaces 3
Features Peewee ere e meena ee eres eee mera Here es es aa seeeEe eee eeeeeesssEsenenes 3
Cassette Player Operation REMAKE ERLELE ERE PCS ee 5
Radio Reception PETES TTCECO TCT ee ee ee ee eee eee T ee Teee ere ee ee eee Se eee ee 5
RDS Functions Pema eer ae enero eres sense esee esses nore eeeeeerenssasssseeE 6
Other Functions Pere eee eee ee cee eee eee eee CeCe eC eee ee eee eee eee 8
Installation PPEPEVTTTSTETICITILOTTITITECrETITETTTTee Tee rrere rr Tree eee) 9
Connections POPP PTTTTTETITITTTTTTTITreeerererreerrreererrirrerer ee reer reer 9
2. ADJUSTMENTS POPTTURITESTTITIETITOTTETITTITELTTT Teer e eer ll
3. ELECTRICAL ADJUSTMENTS ccccccccecccecereeeeeeeseeenes 11
4. DIAGRAMS
4-]. Block Diagram AGE bra Sib S'S Od Olu isle Gee ¥ie's/8 ae TFL8 SSIES 0's w.8.8:6:9 Gis wp bie IE's 6, 16
4-2. Printed Wiring Boards CEREESTERETEER TREE CTE RR hy 19
4-3. Schematic Diagram Pome meer ee recesses eer eeerssevesnsoeessceene 23
4-4, IC Block Diagrams PTETELITITELETETETELTTIRIST ERTL ee 27
5. EXPLODED VIEWS
5-1. Main Section cescscecscccccceessccesscscccescsscessevestscevess 30
5-2. Front Panel Section eee TET eT Ee ee Ee ere 31
5-3. Mechanism Deck Section (MG-50EX-39) -+++++s++++ 32
6. ELECTRICAL PARTS LIST ----e-ce cece cree eee eceeeeneecenees 33
TABLE OF CONTENTS
Flexible Circuit Board Repairing
Keep the temperature of the soldering iron around
270°C during repairing.
Do not touch the soldering iron on the same conduc-
tor of the circuit board (within 3 times).
Be careful not to apply force on the conductor when
soldering or unsoldering.
Notes on chip component replacement
Never reuse a disconnected chip component.
Notice that the minus side of a tantalum capacitor
may be damaged by heat.

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Installation
EE ERR Rc
Precautions
« Do not tamper with the four holes an the upper
sucface of the unit. They are for tuner
adjustments to be done only by service
technicians.
« Choose the installation location carefully so that
the unit will not hamper the driver during
driving. ;
+ Avoid installing the unit where it would be
subject to high temperatures, such as from direct
sunlight of hot aie fram the heater, or where it
would be subject to dust, dirt or excessive
vibration.
« Use only the supplied mounting hardware fora
sale and secure installation.
Mounting angle adjustment
Adjust the mounting angle to less than 20°.
RELEASE button
To detach
Mounting Example
Installation in the dashboard
with the TOP marking up
Connections
Caution
+ This unit is designed for negative ground
12 V DC operation only.
Before making connections, disconnect the
ground terminal of the car battery to avoid short
circuits.
+ Connect the yellow and red power input leads
only after all other leads have been connected.
¢ Be sure to connect the red power input lead to
the positive 12 V power terminal which is
energized when the ignition key is in the
accessory position.
«Run all ground wires to a common ground
point.
Change the position with a jeweler’s screwdriver, ete.
EE
How to Detach and Attach the
Front Panel
Before installing the unit, detach the front
panel.
To detach
Press the RELEASE button to open up the front
panel, then pull it out.
To attach
Align the parts ® and ©, and push the front
panel until it clicks.
Jo attach
Bend these claws, if necessary.
AE EE
If Your Car has No Accessory
Position on the ignition Key
Switch — POWER SELECT Switch
The illumination on the front panel is factory-set
to be turned on even when the unit is not being
played. However, this setting may cause some car
battery wear if your car has no accessory
position on the ignition key switch. To avoid
this battery wear, set the POWER SELECT switch
located on the bottom of the unit to the ©
position, then press the reset button. The
illumination is reset to stay off while the unit is
not being played.
Note
The caution alarm for the front panel is not activated when the
POWER SELECT stitch is set tu the @ position.
3 Fire wall
Dashboard
PERC TT TE ES,
Reset Button
When the installation and connections are over, be
sure to press the reset button with a ball-point pen
etc,
Ca!
\P mah
Reset button

Connection Diagram
Example 1
XR-6450R0S
Connections of Example
Front speakers
Rear speakers
Example 2
XR-6450ROS
Power amplifier
Front speakers
Rear speakers
Rear speakers
RCA pin cord (RC-63 (1 m), RC-64 (2 m), or RC-6S ($ m))(not supplied)
Power amplifier
| A-+-®
Rotary commander (RM-X25) (not supplied)
Front speakers
Rear speakers
Notes on the control leads
« The power antenna control lead (blue) supplics 412 V
DC when you turn on the tuner or when you activate
the ATA (Automatic Tuner Activation), AF
(Alternative Frequency) ar the TA (Traffic
Announcement) fenction,
© A power antenna without relay box cannot be used
toith this unit,
ra
7
O° GD
Memory hold connection
When the yellow power input lead is connected, power
tcilLalways be supplied to the nremory circuil even wher
the ignition key is turned off.
Notes on speaker connection
* Refore connceting the speakers, burn the unit off.
© Use speakers with an impedance of 4 to 8 oliuns, and
with adequate power handling capacities. Otherwise,
the speakers inay be danuaged.
Blue/white striped
AMP REM
Max. supply current 0.3 A
ANT REM
5d
Max. supply current 0.1 A
°
=
©
mom
°
CLS vane
« Do nol connect the terminals of the speaker systent to
the car chassis, and do not connect the terminals of the
right speaker with those of the left speaker.
* Do not attempt to connect the speakers in parallel,
« Do nat connect any active speakers (with built-in
amplifiers) to the speaker terminals of the unit, Doing
so may damage the active speakers, Therefore, be sure to
connect passive speakers ty these terminals,
Rear speakers
to a power antenna relay contro! box
to the 412 V power terminal which is energized in the
accessory position of the ignition key
to the +12 V power terminal which is energized at all times
toa metal point of the car

SECTION 2
ADJUSTMENTS
PRECAUTION
1. Wipe the following components with an absorbent cotton cloth
moistened with alcohol before adjustment :
PB head Pinch roller
Idlers Rubber belts
Capstan
2. Demagnetize the PB head using a head demagnetizer.
3. Be careful not to use a magnetized screwdriver
4. After the adjustments is completed, lock the adjustment parts
using screws.
5. Unless otherwise specified, make adjustments at the specified
voltage (14.4V)
Torque Measurement
Torque Meter Meter Reading
30 — 65gecm
(0.42 — 0.90 ozeinch)
CQ-102C
FWD 0.5 — 4.5g°cm
Back Tension (0.007 — 0.06 ozeinch)
30 — 65g*cm
(0.42 — 0.90 ozeinch)
CQ-102RC
REV 0.5 — 4.5g¢cm
Back Tension (0.007 — 0.06 ozeinch)
60 — 200g*cm
FF, REW CQ-201B
Tape Tension Measurement
Meter Reading
(0.84 — 2.78 ozeinch)
more than 90g
(more than 3.18 0z)
Test Tape
| Type | Signal =~ [| Usedfor
P4-A063 6.3kHz, — 10dB Head azimuth Adjustment
WS-48A 3kHz, 0dB Tape Speed Adjustment
SECTION 3
ELECTRICAL ADJUSTMENTS
TEST MODE
This set have the test mode function, in the test mode. FM Auto
Scan/Stop Level and AM Auto Scan/Stop Level adjustments can be
performed easier than it in ordinaly procedure.
<Set the Test Mode>
Sve BOOS RS
Set the “OFF” mode.
Push the preset [4] button.
Push the preset button.
Press the preset [1 ]button for two seconds.
Then the display indicates five patterns and stops, the test mode
is set.
<Rerease the Test mode>
1:
Push the “OFF” button.
See the adjustment location from on page 15 for the adjustment.
DECK SECTION
PB Head Azimuth Adjustment
Procedure :
1. Put the set into the FWD PB mode.
test tape
P-4-A063
(6.3kHz, — 10dB)
I
Turn the screw and check the output peak value. Adjust the
screw so that the peak value in channels L and R coincides
within 2dB.
LINE OUT
eak
Screw s
position
—t angle
L-CH R-CH
peak peak

3. Playback Mode
test tape
P-4-A63
(6.3kHz, — 100B)
CH 10k Q Oscilloscope
Capstan Motor Tape Speed Adjustment
Procedure :
1. Put the set into the FWD PB mode.
speed checker
or
test tape frequency counter
WS-48A
(3kHz,0dB)
LINE OUT
Specification : Constant speed
— 1.5 to +2.5% 2,955 to 3,075 Hz
Adjustment Location : Capstan motor volume
REV FWD
Sane)
adjustment screw
adjustment screw

TUNER SECTION
Cautions during repair
When the front end is defective, replace it by a new one because
its internal block is difficult to repair.
FM Auto Scan Stop Level Adjustment
Setting :
TUNER button : FM
FM PF signal
generator
main antenna terminal
Carrier frequency : 98,.0MHz
Output level / 220B (12.6 V)
Mode mono
Modulation :no modualation
Procedure :
1. Set to the test mode. (see page 11)
2. Push the] TUNER] button and set to FM.
Main Display
cM
mri
Push the preset button.
Adjust with the volume RV3 on TU1 so that the “FM”
indication turns to “FMI” indication on the main display
window.
But in case of already indicated “FMII” , turn the RV3 so that
put out light “II” indication and adjustment.
Main Display
F My [Tl
Specification : Stop sensitivity : 22dB + 3dB
Note: “II” indication of main display was align voltage of TP
(SD).
TP (SD) voltage OV >“ II” light off
TP (SD) voltage SV ~“ Il” light on
(MAIN BOARD) (Conductor side)
%
TP (SD)
MW Auto Scan Stop Level Adjustment
Setting :
TUNER button : MW
rage Nee ee 7
30Q 15pF |
| |
AM PF signal | 65pF |
generator | | |
AM dummy bs So ea ee Se a
antenna
set
Carrier frequency : 999kHz
30% amplitude
Modulation by 400Hz signal
Output level :33dB (44.7uV) main antenna terminal
Procedure :
1. Set to the test mode. (see page 11)
2. Push the} TUNER] button and set to MW.
Main Display
3, Adjust with the volume RVI on TUI so that the “MW”
indication turns to “MWII” indication on the main display
window.
But in case of already indicated “MWiII” , turn the RV1 so that
put out light “Il” indication and adjustment.
Main Display
MW
Specification : Stop sensitivity : 33dB + 3dB
Note: “ Il ” indication of main display was align voltage of TP
(SD).
TP (SD) voltage OV — “ I” light off
TP (SD) voltage 5V >“ Il” light on

High Cut Control Effect Adjustment
Setting :
TUNER button : FM
FM RFF signal
generator
main antenna terminal VTVM
Carrier frequency : 98.0MHz LINE OUT
Output level 1 600B (ImV)
Mode i mono
Modulation ‘ 10kHz, 75kHz deviation
Procedure :
1. Tune the 98.0MHz.
2. The then output level is supposing that (A) dB.
3. Adjust with the volume RV2 on TUI so that the output Level is
(A) — 5 + 2dB then signal generator input set to 20dB.
Adjustment Location : Main board (TU1)
FM Noise Focus Adjustment
Setting :
TUNER button : FM
FM AF signal
generator
main antenna terminal VTVM
Carrier frequency : 98.0MHz LINE OUT
Output level / 600B (1mV)
Mode mono
Modulation ! 10kHz, 75kHz deviation
Procedure :
1. Tune the 98.0MHz.
2. The then output level is supposing that (B) dB.
3. Adjust with the volume RV5 on TU1 so that the output Level is
(B) — 30 + 3dB then signal generator input set to — 20dB.
Adjustment Location : Main board (TU1)
FM Stereo Separation (30dB) Adjustment
Setting :
TUNER button : FM
FM PF signal
generator
main antenna terminal VTVM
Carrier frequency : 98.0MHz LINE OUT
Output level / 700B (3.2mV)
Mode : stereo
Modulation ‘main; 1kHz, 33.75kHz deviation (45%)
Sub : (kHz, 33.75kHz deviation (45%)
19kHz pilot : 7.5kHz deviation (10%)
Procedure :
FM stereo
signal generator
output channel
VTVM VTVM
connection reading (dB)
Adjust RV4 for
minimum reading.
Adjust RV4 for
minimum reading.
L-CH Stereo separation : @ -—®)
R-CH Stereo separation: ©-O
The separations of both channels should be equal.
Specification : Separation more than 30dB.
Adjustment Location : Main board (TU1)

S Meter Adjustment
Setting: Procedure :
TUNER button : FM 1. Set to the test mode. (see page 11)
2. Push the} TUNER |button and set to FM.
oa BEsanal SEO en 3. Tune the 98.0MHz.
4. Push the preset [ 6 button to set the level indication on the main
0.01 uF display window.
pose | 5. Adjust with the RV1 on main board so that the level indication
—— turn to "118 + 2” indication on the main display window.
Carrier frequency : 98.0MHz Main Display
Output level 1 350B (56.2 us V)
Modulation ino modulation
Adjustment Parts Location Diagrams :
{[MAIM BOARD] (Component side)
RV3 : FM AUTO SCAN STOP Tut
Level Adjustment
RV5 : FM NOISE FOCUS
Adjustment
RV1 ; MW AUTO SCAN STOP
LEVE! Adjustment
RV2 : HIGH CUT CONTROL EFFECT
Adjustment
RV1 : S Meter Adjustment
RV4: FM STEREO SEPARATION (3008)
Adjustment

4-1. BLOCK DIAGRAM
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MOTOR {LM Gul 2
$901
TAPE OPERATION
ROTARY SLIBE
SWITCH
M301
MOTOR “F
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SECTION 4
TUNER UNIT
TUX-OO1A
TU |
LO/AX
SWITCH
Qi
COUNTER
RVI
CN352
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SWALLOW
1716 1/7 4BET
DIAGRAMS
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CONTROL LOGIC
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LORBDING MOTOR
SRIVER
10360
Q365
TAPE REG
9361
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SWITCH
MUTE RIVE
Q501
TAPE REG
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Q362-
AN IN| SWITCH
INPUT
MUTE RIVE
Q503
Bt (8V)
EQUALIZER OUT
1C350
TEPE B+
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Q363
2nd ORBER
ANTIALIAS
FILTER
FILTER
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1ci51
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Btn ORDER COSTAS LOOP = LCD BACK
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