Sony XR-1800RD Service Manual
XR-1800RD
m
m
SERVICE MANUAL
SPECIFICATIONS
Cassette player section
Tape track 4-track 2-channel stereo
Wow and flutter 0.13 % (WRMS)
Frequency response 30 – 15,000 Hz
Signal-to- noise ratio 55 dB
UK Model
Model Name Using Similar Mechanism XR-1800R
T ape Transport Mechanism Type MG-36SZ9-32
Power amplifier section
Outputs Speaker outputs
Speaker impedance 4 – 8 ohms8
Maximum power output 35 W × 4 (at 4 ohms)
(sure seal connectors)
Tuner section
FM
Tuning range 87.5 – 108.0 MHz
Aerial terminal External aerial connector
Intermediate frequency 10.7 MHz
Usable sensitivity 9 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),
Harmonic distortion at 1 kHz
Separation 35 dB at 1 kHz
Frequency response 30 – 15,000 Hz
MW/LW
Tuning range MW:531 – 1,602 kHz
Aerial terminal External aerial connector
Intermediate frequency 450 kHz
Sensitivity MW:30 µV
68 dB (mono)
0.7% (stereo),
0.4% (mono)
LW:153 – 281 kHz –
LW:50 µV
General
Output lead Power aerial relay control
Tone controls Bass ±8 dB at 100 Hz
Power requirements 12 V DC car battery
Dimensions Approx. 186 × 57 × 176 m
Mounting dimension Approx. 182 × 53 × 163 m
Mass Approx. 1.2 kg
Supplied accessories Parts for installation and
Design and specifications are subject to change
without notice.
lead
Treble ±8 dB at 10 kHz
(negative ground)
(w/h/d) not incl.
projecting parts and
controls
(w/h/d) not incl.
projecting parts and
controls
connections (1 set)
FM/MW/LW CASSETTE CAR STEREO
TABLE OF CONTENTS
1. GENERAL
Button Locations ............................................................. 3
Setting the Clock ............................................................. 3
2. DISASSEMBLY ......................................................... 4
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 conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
3. MECHANICAL ADJUSTMENTS....................... 8
4. ELECTRICAL ADJUSTMENTS
Tape Deck Section .......................................................... 8
Tuner Section .................................................................. 9
5. DIAGRAMS
5-1. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 13
5-2. Printed Wiring Board – MAIN Board – ........................ 15
5-3. Schematic Diagram – MAIN Board (1/2) – .................. 16
5-4. Schematic Diagram – MAIN Board (2/2) – .................. 17
5-5. Printed Wiring Board – KEY Board –........................... 18
5-6. Schematic Diagram – KEY Board – ............................. 19
5-7. IC Pin Function Description ........................................... 21
6. EXPLODED VIEWS................................................ 23
7. ELECTRICAL PARTS LIST ............................... 29
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.
2
SECTION 1
GENERAL
This section is extracted from
instruction manual.
Button locations
RELEASE
EN
Refer to the pages for further details.
1 Display window
2 SEL (control mode select) button 6, 11,
13, 14
3 DSPL (display mode change/time set)
button 6, 10
4 Z (eject) button 6
5 During radio reception:
Preset number buttons 8, 9, 11, 12
During tape playback:
(1) ATA (Automatic Tuner Activation)
button 7
6 m/M (fast winding)/DIR (tape
transport direction change) buttons 6, 7
7 AF/TA (alternative frequency/traffic
announcement) button 10, 11, 12
SEL PTY
DSPL ATA
DIR
213 64 5
SEEK
MANU
8 RELEASE (front panel release) button
5, 15
9 (--)(+) (volume/bass/treble/balance/
fader control) buttons 6, 14
0 SEEK/MANU button 7, 8, 10, 13
qa PTY/LOUD (Programme type/loudness)
button 13, 14
qs Reset button (located on the front side
of the unit hidden by the front panel) 5
Press this button when you use this unit
for the first time, when you have changed
the car battery, or when the buttons of this
unit do not function properly.
qd TUNER/BTM (radio on • band select/Best
tuning memory function) button 7, 8, 9,
12
qf OFF button 5
LOUD
TUNER OFF
AF/TA
BTM
XR-1800R
Setting the clock
The clock has a 24-hour digital indication.
For example, setting it to 10:08
1
Display the time.
(Press (DSPL) during unit operation.)
2
Press (DSPL) for more than two seconds.
The hour digit blinks.
Set the hour digits.
(to go back) (to go forward)
EN
3
Press the (SEL) button momentarily.
The minute digits blink.
Set the minute digits.
(to go back)
4
Press (DSPL) momentarily.
(to go forward)
The clock starts.
Note
The clock cannot be set unless the power is turned
on. Set the clock after you turn on the radio, or
during tape playback.
4
6
3
SECTION 2
k
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
COVER ASSY
3
2
1
cover assy
MECHANISM DECK BLOCK
1
two screws
(PTT2.6 × 6)
2
connector
(CN901)
1
two screws
(PTT2.6
2
×
6)
3
mechanism deck bloc
1
4
MAIN BOARD, HEAT SINK
)
k
2
two screws
(ground point)
3
main board
4
five screws
(PTT2.6
×
1
two screws
(PTT2.6
5
8)
×
heat sink
6
MECHANISM DECK
(MG-36SZ9-32)
1
two screws
(P2.6
3
mechanism dec
(MG-36SZ9-32)
2
bracket (MD)
1
×
4)
two screws
(P2.6 × 4)
5
MOTOR ASSY (CAPSTAN/REEL) (M901)
)
2
belt
3
belt
1
two screws
×
3)
(P2
4
motor assy (CAPSTAN/REEL
(M901)
CASSETTE HANGER (X)
4
2
Remove the return link
in the direction of the arrow.
two claws
3
boss
3
1
Remove the claw
in the direction of the arrow.
5
cassette hanger (x)
boss
1
Remove the claw
in the direction of the arrow.
6
CASSETTE HOLDER (X)
)
A
1
Push the arrow A part.
2
Remove the cassette holder (x
in the direction of the arrow.
7
SECTION 3
l
e
MECHANICAL ADJUSTMENTS
SECTION 4
ELECTRICAL ADJUSTMENTS
1. Clean the follo wing parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
rubber belt capstan
idler
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the power supply
voltage (14.4 V) unless otherwise noted.
• Tor que Measurement
Mode Torque Meter Meter Reading
Forward CQ-102C (25 – 55 g•cm)
Forward
Back Tension
Reverse CQ-102RC (25 – 55 g•cm)
Reverse
Back Tension
FF, REW CQ-201B (50 – 150 g•cm)
CQ-102C (1.5 – 4 g•cm)
CQ-102RC (1.5 – 4 g•cm)
2.46 – 5.39 mN•m
(0.35 – 0.76 oz•inch)
0.15 – 0.39 mN•m
(0.02 – 0.06 oz•inch)
2.46 – 5.39 mN•m
(0.35 – 0.76 oz•inch)
0.15 – 0.39 mN•m
(0.02 – 0.06 oz•inch)
4.91 – 14.70 mN•m
(0.69 – 2.08 oz•inch)
TAPE DECK SECTION 0 dB= 0.775 V
1. The adjustments should be performed in the order given in
this service manual.
2. The adjustments should be performed for both L-CH and
R-CH.
Test T ape
Type Signal Used for
P-4-A063 6.3 kHz, –10 dB head azimuth adjustment
WS-48A 3 kHz, 0 dB tape speed adjustment
PB Head Azimuth Adjustment
Procedure:
1. Put the set into the FWD PB mode.
test tape
P-4-A063
(6.3 kHz, –10 dB)
set
4 Ω
speaker out termina
2. Turn the screw and check the output peak value. Adjust the
screw so that the peak value in channels L and R coincides
within 2 dB.
level
meter
+
–
• Tape T ension Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A more than 60 g
Reverse CQ-403R (more than 2.12 oz)
output
level
within
2 dB
L-CH
peak
R-CH
peak
L-CH
peak
screw
position
R-CH
peak
3. Check the phase in the FWD PB mode.
test tape
P-4-A063
(6.3 kHz, –10 dB)
L-CH
set
R-CH
4 Ω
4 Ω
speaker out terminal
Screen pattern
oscilloscope
within
2 dB
angl
V
H
+
+
–
–
in phase
8
45 °
good wrong
90 °
135 ° 180 °
4. Repeat the above adjustment for the REV PB mode.
r
)
)
5. Check that output level difference between FWD PB mode
and REV PB mode is within 4 dB.
Adjustment Location: PB head
TUNER SECTION
0 dB=1 µV
Cautions during repair
When the tuner unit is defective, replace it by a new one because its internal block is difficult to repair.
Tape Speed Adjustment
Setting:
test tape
WS-48A
(3 kHz, 0 dB)
set
FWD
REV
frequency counte
4
Ω
+
–
speaker out terminal
adjustment
screws
Note: Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Noise Focus Adjustment
3. FM Stereo Separation Adjustment
4. FM Signal Meter Adjustment
5. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[TUNER] button: FM 1
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level : 28 dB (25.1 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%
MAIN board
TP101 (SD)
dummy
antenna
50 Ω
50 Ω
Procedure:
1. Tune the set to 98.0 MHz.
2. Connect the digital voltmeter to TP101 (SD) on MAIN board.
3. Adjust RV2 on TU100 so that the reading on the digital voltmeter changes point from low to high.
0.1pF
digital
voltmeter
+
–
antenna
jack (CN900
set
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the frequency counter becomes in 3,015 Hz.
Specified V alue: 2,940 to 3,090 Hz
Adjustment Location: See page 12.
Adjustment Location: See page 12.
9
FM Noise Focus Adjustment
Setting:
[TUNER] button: FM1
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level : 60 dB (1 mV)
Mode : mono
Modulation : 1 kHz, 75 kHz deviation (100%)
antenna jack (CN900)
0.01 µF
set
speaker out terminal
4 Ω
Procedure:
1. Tune the 98.0 MHz.
2. The then output level is supposing that (A) dB.
3. Adjust with the v olume R V3 on TU100 so that the output level
is (A) –31 dB then signal generator input set to –20 dB.
level meter
+
–
FM Signal Meter Adjustment
Setting:
[TUNER] button: FM1
FM RF signal
generator
antenna jack (CN900)
0.01 µF
set
Carrier frequency : 98.00 MHz
Output level : 35 dB (56.2 µV)
Mode : mono
Modulation : no modulation
Procedure:
1. Press [OFF] button to turn the set OFF.
2. Press [4] button and [5] button.
3. Press and hold [1] button for 3 to 4 seconds.
4. Press [TUNER] button for 2 to 3 times.
Display
Adjustment Location: See page 12.
FM Stereo Separation Adjustment
Setting:
[TUNER] button: FM1
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level : 76 dB (6.3 mV)
Mode : stereo
Modulation : main: 1 kHz, 33.75 kHz deviation (45%)
antenna jack (CN900)
0.01 µF
set
sub: 1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot: 7.5 kHz deviation (10%)
4 Ω
speaker out terminal
Procedure:
FM Stereo
signal generator
output channel
L-CH L-CH A
R-CH L-CH Adjust RV4 on TU100
R-CH R-CH C
L-CH R-CH Adjust RV4 on TU100
Level meter Level meter
connection reading (dB)
for minimum reading.
for minimum reading.
level meter
B
D
FM
AMSREG
5. Press [6] button, the test mode is set.
6. Adjust RV100 so that the display indication is “118”.
+
–
Display
FM
AMSREG
Specified Value: Display indication: 116 to 120
Adjustment Location: See page 12.
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specified Value: Separation more than 26 dB
Adjustment Location: See page 12.
10
MW Auto Scan/Stop Level Adjustment
Setting:
[TUNER] button: MW
AM RF signal
generator
(50 Ω)
AM dummy
antenna
30 Ω
15 pF
65 pF
set
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
Output level : 33 dB (44.7 µV)
MAIN board
TP101 (SD)
antenna jack (CN900)
digital
voltmeter
+
–
Procedure:
1. Tune the set to 999 kHz
2. Connect the digital v oltmeter to TP101 (SD) on MAIN board .
3. Adjust RV1 on TU100 so that the reading on the digital voltmeter changes point from low to high.
Adjustment Location: See page 12.
11
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