SONY XR-1800, XR-1803, XR-1804 Service Manual
XR-1800/1803/1804
SERVICE MANUAL
Photo: XR-1804
SPECIFICA TIONS
AEP Model
UK Model
E Model
XR-1800
East European Model
XR-1803
Saudi Arabia Model
XR-1804
Model Name Using Similar Mechanism NEW
T ape Transport Mechanism Type MG-36SZ9-32
MICROFILM
– Continued on next page –
XR-1800: AEP, UK Model/XR-1803
FM/MW/LW CASSETTE CAR STEREO
XR-1800: E Model
FM/AM CASSETTE CAR STEREO
XR-1804
FM/MW/SW CASSETTE CAR STEREO
TABLE OF CONTENTS
1. GENERAL
Button Locations ............................................................. 3
Setting the Clock ............................................................. 3
Installation....................................................................... 4
Connections ..................................................................... 4
2. DISASSEMBLY ......................................................... 6
3. MECHANICAL ADJUSTMENTS ....................... 10
4. ELECTRICAL ADJUSTMENTS
Tape Deck Section .......................................................... 10
Tuner Section .................................................................. 11
5. DIAGRAMS
5-1. IC Pin Function Description ........................................... 14
5-2. Note for Pr inted Wriring Boards and
Schematic Diagrams ....................................................... 16
5-3. Pr inted Wiring Board – Main Section – ........................ 17
5-4. Schematic Diagram – Main Section (1/2) – ................... 19
5-5. Schematic Diagram – Main Section (2/2) – ................... 21
5-6. Pr inted Wiring Board – PANEL Section – .................... 23
5-7. Schematic Diagram – PANEL Section –....................... 23
6. EXPLODED VIEWS ................................................ 26
7. ELECTRICAL PARTS LIST ............................... 32
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing 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.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
– 2 –
SECTION 1
GENERAL
This section is extracted from
instruction manual.
– 3 –
– 4 –
– 5 –
SECTION 2
k
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
COVER ASS’Y
3
2
1
cover ass’y
MECHANISM DECK BLOCK
1
two screws
(PTT2.6
2
connector
(CN901)
2
1
1
two screws
×
6)
(PTT2.6
×
6)
3
mechanism deck bloc
– 6 –
MAIN BOARD, HEAT SINK
)
k
3
two screws
(ground point)
4
main board
1
five screws
(PTT2.6
×
1
two screws
(PTT2.6
2
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
×
4)
(P2.6
– 7 –
MOTOR ASS’Y (CAPSTAN/REEL) (M901)
)
2
belt
2
belt
1
two screws
(P2
×
3)
3
motor ass’y (CAPSTAN/REEL
(M901)
CASSETTE HANGER (X)
4
2
Remove the return link
toward direction.
two claws
3
boss
3
1
Remove the claw toward
direction.
5
cassette hanger
boss
– 8 –
1
Remove the claw toward
direction.
CASSETTE HOLDER (X)
)
1
A
Push an arrow A part.
2
Removal the cassette holder (x
to direction of the arrow.
– 9 –
SECTION 3
e
l
MECHANICAL ADJUSTMENTS
SECTION 4
ELECTRICAL ADJUSTMENTS
1. Clean the following 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
Forward
Back Tension (0.02 – 0.06 oz•inch)
Reverse CQ-102RC
Reverse
Back Tension (0.02 – 0.06 oz•inch)
FF, REW CQ-201B
CQ-102C
CQ-102RC
25 – 55 g•cm
(0.35 – 0.76 oz•inch)
1.5 – 4 g•cm
25 – 55 g•cm
(0.35 – 0.76 oz•inch)
1.5 – 4 g•cm
50 – 150 g•cm
(0.69 – 2.08 oz•inch)
• Tape T ension Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A more than 60 g
Reverse CQ-403R (more than 2.12 oz)
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
so that the peak value in channels L and R coincides
screw
within 2 dB.
level
meter
+
–
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
in phase
4
Ω
4
Ω
speaker out terminal
Screen pattern
45
°
90
good wrong
135 °180
°
oscilloscope
within
2 dB
angl
V
H
+
+
–
–
°
– 10 –
4. Repeat the above adjustment for the REV PB mode.
)
)
5. Check that output level difference between FWD PB mode
and REV PB mode is within 4 dB.
Adjustment Location: PB head
FWD
adjustment
screws
REV
TUNER SECTION
XR-1800 E model, a tuner section is no adjustment.
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.
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. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[TUNER] button: FM 1
FREQUENCY SELECT switch: FM50 k (XR-1804 only)
See the adjustment location from on page 13 for the
adjustment.
Tape Speed Adjustment
Setting:
speed checker
or
test tape
WS-48A
(3 kHz, 0 dB)
set
frequency counter
Ω
4
+–
speaker out terminal
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the speed checker or frequency counter becomes in
specification.
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level : 28 dB (25.1
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%
MAIN board
TP2 (SD)
dummy
antenna
50
50
Ω
Ω
µ
digital
voltmeter
+
–
0.1pF
antenna
jack (CN900
set
V)
Procedure:
1. Tune the set to 98.0 MHz.
2. Connect the digital voltmeter to TP2 (SD) on MAIN board.
3. Adjust RV2 on TU100 so that the reading on the digital voltmeter changes point from low to high.
Adjustment Location: See page 13.
Specification: Constant speed
Speed checker Frequency counter
–2 to +3% 2,940 to 3,090 Hz
Adjustment Location: See page 13.
– 11 –
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