SONY XR-1800R Service Manual
XR-1800R
SERVICE MANUAL
SPECIFICATIONS
AEP Model
UK Model
Model Name Using Similar Mechanism XR-1800
Tape Transport Mechanism Type MG-36SZ9-32
MICROFILM
FM/MW/LW CASSETTE CAR STEREO
TABLE OF CONTENTS
1. GENERAL
Button Locations ............................................................. 3
Setting the Clock ............................................................. 3
Installation....................................................................... 4
Connections ..................................................................... 5
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.
2. DISASSEMBLY ......................................................... 8
3. MECHANICAL ADJUSTMENTS....................... 12
4. ELECTRICAL ADJUSTMENTS
Tape Deck Section .......................................................... 12
Tuner Section .................................................................. 13
5. DIAGRAMS
5-1. Notes for Printed Wiring Board and
Schematic Diagram ......................................................... 17
5-2. Printed Wiring Board – MAIN Section –....................... 19
5-3. Schematic Diagram – MAIN Section (1/2) –................. 21
5-4. Schematic Diagram – MAIN Section (2/2) –................. 23
5-5. Printed Wiring Board – PANEL Section –.................... 25
5-6. Schematic Diagram – PANEL Section –....................... 27
5-7. IC Pin Function Description ........................................... 31
6. EXPLODED VIEWS ................................................ 33
7. ELECTRICAL PARTS LIST ............................... 39
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.
– 3 –
– 4 –
– 5 –
– 6 –
– 7 –
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
2
connector
(CN901)
two screws
(PTT2.6 × 6)
1
two screws
(PTT2.6 × 6)
2
3
mechanism deck bloc
1
– 8 –
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 × 4)
3
mechanism dec
(MG-36SZ9-32)
2
bracket (MD)
1
two screws
(P2.6 × 4)
– 9 –
MOTOR ASS’Y (CAPSTAN/REEL) (M901)
)
2
belt
2
belt
1
two screws
×
3)
(P2
3
motor ass’y (CAPSTAN/REEL
(M901)
CASSETTE HANGER (X)
4
two claws
2
Remove the return link
toward direction.
3
boss
3
1
Remove the claw toward
direction.
5
cassette hanger (x)
boss
– 10 –
1
Remove the claw toward
direction.
CASSETTE HOLDER (X)
)
A
1
Push an arrow A part.
2
Removal the cassette holder (x
to direction of the arrow.
– 11 –
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
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
screw so that the peak value in channels L and R coincides
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
+
+
–
–
°
– 12 –
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