Sony XR-1800 User manual

MICROFILM
SERVICE MANUAL AEP Model
UK Model
E Model
XR-1800
East European Model
XR-1803
Saudi Arabia Model
XR-1804
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MG-36SZ9-32
SPECIFICATIONS
XR-1800/1803/1804
Photo: XR-1804
– 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

– 2 –
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 Printed Wriring Boards and
Schematic Diagrams ....................................................... 16
5-3. Printed 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. Printed 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.

– 3 –
SECTION 1
GENERAL This section is extracted from
instruction manual.

– 4 –

– 5 –

– 6 –
COVER ASS’Y
MECHANISM DECK BLOCK
Note: Follow the disassembly procedure in the numerical order given.
SECTION 2
DISASSEMBLY
1 two screws
(PTT2.6
× 6)
3 mechanism deck bloc
k
1 two screws
(PTT2.6
× 6)
2 connector
(CN901)
3 cover ass’y
2
2
1
1

– 7 –
MAIN BOARD, HEAT SINK
MECHANISM DECK
(MG-36SZ9-32)
1 two screws
(PTT2.6
× 6
)
2 heat sink
3 two screws
(ground point)
4 main board
1 five screws
(PTT2.6
× 8)
1 two screws
(P2.6
× 4)
3 mechanism dec
k
(MG-36SZ9-32)
1 two screws
(P2.6
× 4)
2 bracket (MD)

– 8 –
MOTOR ASS’Y (CAPSTAN/REEL) (M901)
CASSETTE HANGER (X)
1 two screws
(P2
× 3)
3 motor ass’y (CAPSTAN/REEL
)
(M901)
2 belt
2 belt
1 Remove the claw toward
direction.
2 Remove the return link
toward direction.
5 cassette hanger
3 boss
3 boss
4 two claws
1 Remove the claw toward
direction.

– 9 –
CASSETTE HOLDER (X)
A
1 Push an arrow A part.
2 Removal the cassette holder (x
)
to direction of the arrow.

– 10 –
SECTION 3
MECHANICAL ADJUSTMENTS
Mode Tension Meter Meter Reading
Forward CQ-403A more than 60 g
Reverse CQ-403R (more than 2.12 oz)
•TapeTension Measurement
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.
•Torque Measurement
Mode Torque Meter Meter Reading
Forward CQ-102C 25 – 55 g•cm
(0.35 – 0.76 oz•inch)
Forward CQ-102C 1.5 – 4 g•cm
Back Tension (0.02 – 0.06 oz•inch)
Reverse CQ-102RC 25 – 55 g•cm
(0.35 – 0.76 oz•inch)
Reverse CQ-102RC 1.5 – 4 g•cm
Back Tension (0.02 – 0.06 oz•inch)
FF, REW CQ-201B 50 – 150 g•cm
(0.69 – 2.08 oz•inch)
SECTION 4
ELECTRICAL ADJUSTMENTS
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.
TestTape
PB Head Azimuth Adjustment
Procedure:
1. Put the set into the FWD PB mode.
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.
3. Check the phase in the FWD PB mode.
Type Signal Used for
P-4-A063 6.3 kHz, –10 dB head azimuth adjustment
WS-48A 3 kHz, 0 dB tape speed adjustment
screw
position
L-CH
peak
within
2 dB
output
level
L-CH
peak R-CH
peak
within
2 dB
angl
e
R-CH
peak
test tape
P-4-A063
(6.3 kHz, –10 dB)
L-CH
R-CH speaker out terminal
oscilloscope
VH
++
––
Screen pattern
in phase good wrong
45
°
90 °
135 ° 180 °
4 Ω
4 Ω
set
level
meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
set
speaker out termina
l
4 Ω
+
–