Sony XRC-7220-R Service manual
XR-C7220R
SERVICE MANUAL
For RM-X4S (Remote Commander),
please refer to RM-X4S Service Manual
(9-925-698-∏) previously issued.
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.
SPECIFICA TIONS
AEP Model
UK Model
Model Name Using Similar Mechanism XR-C8100R
T ape Transport Mechanism Type MG-25D-136
MICROFILM
FM/MW/LW CASSETTE CAR STEREO
TABLE OF CONTENTS
1. GENERAL
Location of controls ........................................................ 3
Resetting the unit ............................................................ 4
Detaching the front panel................................................ 4
Setting the clock.............................................................. 4
Labelling the rotary commander..................................... 4
Using the rotary commander .......................................... 4
Adjusting the sound characteristics ................................ 5
Attenuating the sound ..................................................... 5
Changing the sound and display settings ....................... 5
Installation....................................................................... 6
Connections ..................................................................... 7
2. DISASSEMBLY ......................................................... 12
3. ASSEMBLY OF MECHANISM DECK........... 14
4. MECHANICAL ADJUSTMENTS....................... 17
5. ELECTRICAL ADJUSTMENTS
Test Mode........................................................................ 18
Tape Deck Section .......................................................... 18
Tuner Section .................................................................. 19
6. DIAGRAMS
6-1. Block Diagram – TUNER/TAPE Section – ................... 23
6-2. Block Diagram – MAIN Section –................................. 25
6-3. Block Diagram
– DISPLAY/KEY CONTROL Section –........................ 27
6-4. Block Diagram
– BUS CONTROL/POWER SUPPLY Section –........... 29
6-5. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 31
6-6. Printed Wiring Board
– Main Board (Component Side) – ................................ 33
6-7. Printed Wiring Board
– Main Board (Conductor Side) – .................................. 35
6-8. Schematic Diagram – Main Board (1/4) – ..................... 37
6-9. Schematic Diagram – Main Board (2/4) – ..................... 39
6-10. Schematic Diagram – Main Board (3/4) – ..................... 41
6-11. Schematic Diagram – Main Board (4/4) – ..................... 43
6-12. Printed Wiring Board – KEY Board –........................... 45
6-13. Schematic Diagram – KEY Board – .............................. 47
6-14. Printed Wiring Board
– SUB/INVERTER Board – ........................................... 49
6-15. Schematic Diagram – SUB/INVERTER Board – .......... 50
6-16. IC Pin Function Description ........................................... 54
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.
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.
7. EXPLODED VIEWS ................................................ 58
8. ELECTRICAL PARTS LIST ............................... 61
– 2 –
SECTION 1
GENERAL
This section is extracted from
instruction manual.
– 3 –
– 4 –
– 5 –
– 6 –
– 7 –
– 8 –
– 9 –
– 10 –
– 11 –
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
SUB PANEL ASS’Y
3
two claws
2
three screws
(PTT2.6 × 6)
1
connector
(CN802)
3
claw
4
connector
(CN500)
MECHANISM DECK (MG-25D-136)
1
connector
(CN201)
5
sub panel ass’y
3
two screws
(2.6 × 6)
4
lag
2
flexible flat cable
(CN250)
2
screw
(PTT2.6 × 6)
5
mechanism deck
(MG-25D-136)
– 12 –
MAIN BOARD, HEAT SINK
1
connector
(CN553)
2
three ground point
screws
4
main board
1
connector
(J10)
5
screw
(PTT2.6 × 10)
6
inverter ass’y
3
9
screw
(PTT2.6 × 10)
seven screws
(PTT2.6 × 10)
0
heat sink
3
screw
(PTT2.6 × 10)
8
7
screw
(PTT2.6 × 10)
cord (with connector)
(ANT)
– 13 –
SECTION 3
ASSEMBLY OF MECHANISM DECK
Note: Follow the assembly procedure in the numerical order given.
HOUSING
4
Fit claw on B part.
3
Put the housing
under A part.
2
Install the hanger onto
two claws of the housing.
housing
5
Fit projection on C part.
C
part
7
Holder the hanger by bending the claw.
1
Install the catch to the hanger.
hanger
6
Fit projection on D part.
8
Hold the hanger by
bending the claw.
ARM (SUCTION)
A
part
projection
B
part
D
part
2
Move the arm (suction) in the arrow
direction and fit on projection.
1
Fit the arm (suction) on the shaft.
– 14 –
LEVER (LDG-A)/(LDG-B)
shaft
A
1
Fit the lever (LDG-A) on
shafts A – C and install it.
shaft
B
shaft
C
3
type-E stop ring 2.0
shaft
A
Fit the lever (LDG-B) on
2
shafts
install it.
A
and B and
shaft
B
GEAR (LDG-FT)
hole
hole
gear (LDG-D)
lever (LDG-A)
gear (LDG-FB)
4
Align hole in the gear (LDG-D)
with hole the lever (LDG-A).
2
tension spring (LD-2)
5
gear (LDG-FT)
1
6
polyethylene washer
2
tension spring (LD-1)
– 15 –
3
Move the lever (LDG-B)
in the arrow direction.
GUIDE (C)
2
guide (C)
1
three claws
MOUNTING POSITION OF CAPSTAN/REEL MOTOR (M901)
two precision screws
×
2)
(P2
capstan/reel motor
(M901)
30˚
– 16 –
SECTION 4
MECHANICAL 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. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the power supply
voltage unless otherwise noted.
• T orque Measurement
Mode Torque Meter Meter Reading
Forward CQ-102C
Forward
Back Tension (0.01 – 0.06 oz•inch)
Reverse CQ-102RC
Reverse
Back Tension (0.01 – 0.06 oz•inch)
FF, REW CQ-201B
CQ-102C
CQ-102RC
30 – 65 g•cm
(0.42 – 0.90 oz•inch)
0.5 – 4.5g•cm
30 – 65 g•cm
(0.42 – 0.90 oz•inch)
0.5 – 4.5g•cm
60 – 200 g•cm
(0.83 – 2.78 oz•inch)
• T ape Tension Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A
Reverse CQ-403R
(more than 3.18 oz)
(more than 3.18 oz)
more than 90 g
more than 90 g
– 17 –
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