Sony XR-C8220 User manual

MICROFILM
SERVICE MANUAL
FM/AM CASSETTE CAR STEREO
US Model
E Model
SPECIFICATIONS
XR-C8220
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol aare trade-
marks of Dolby Laboratories Licensing Corporation.
Model Name Using Similar Mechanism XR-C9100
Tape Transport Mechanism Type MG-25D-136
For RM-X4S (Remote Commander),
please refer to RM-X4S Service Manual
(9-925-698-∏) previously issued.

– 2 –
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 .......................................... 5
Adjusting the sound characteristics ................................ 5
Attenuating the sound ..................................................... 5
Changing the sound and display settings ....................... 5
Adjusting the frequency of the subwoofer (S) ............... 5
Adjusting the sound and
frequency of the equalizer .............................................. 5
Changing the line output level ........................................ 5
Installation....................................................................... 6
Connections ..................................................................... 7
2. DISASSEMBLY ......................................................... 9
3. ASSEMBLY OF MECHANISM DECK........... 11
4. MECHANICAL ADJUSTMENTS....................... 14
5. ELECTRICAL ADJUSTMENTS
Test Mode ........................................................................ 14
Tape Deck Section .......................................................... 14
Tuner Section .................................................................. 15
6. DIAGRAMS
6-1. Block Diagram – TUNER/TAPE Section – ................... 19
6-2. Block Diagram – MAIN Section – ................................. 21
6-3. Block Diagram
– DISPLAY/KEY CONTROL Section –........................ 23
6-4. Block Diagram
– BUS CONTROL/POWER SUPPLY Section – ........... 25
6-5. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 27
6-6. Printed Wiring Board
– Main Board (Component Side) – ................................ 29
6-7. Printed Wiring Board
– Main Board (Conductor Side) – .................................. 31
6-8. Schematic Diagram – Main Section (1/4) – ................... 33
6-9. Schematic Diagram – Main Section (2/4) – ................... 35
6-10. Schematic Diagram – Main Section (3/4) – ................... 37
6-11. Schematic Diagram – Main Section (4/4) – ................... 39
6-12. Printed Wiring Board – PANEL Section – .................... 41
6-13. Schematic Diagram – PANEL Section – ........................ 43
6-14. Printed Wiring Board
– SUB/INVERTER Section – ......................................... 45
6-15. Schematic Diagram – SUB/INVERTER Section –........ 46
6-16. IC Pin Function Description ........................................... 50
7. EXPLODED VIEWS ................................................ 54
8. ELECTRICAL PARTS LIST ............................... 57
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 –

– 7 –

– 8 –

– 9 –
SUB PANEL ASS’Y
MECHANISM DECK (MG-25D-136)
Note: Follow the disassembly procedure in the numerical order given.
SECTION 2
DISASSEMBLY
2 three screws
(PTT2.6 × 6)
2 screw
(PTT2.6 × 6)
5 sub panel ass’y
1 connector
(CN802)
3 two claws
3 claw
4 connector
(CN500)
1 connector
(CN201)
3 two screws
(2.6 × 6)
4 lag
5 mechanism dec
k
(MG-25D-136)
2 flexible flat cable
(CN250)

– 10 –
MAIN BOARD, HEAT SINK
4 main board
2 three ground point
screws
1 connector
(CN553)
1 connector
(J10)
5 screw
(PTT2.6 × 10)
3 screw
(PTT2.6 × 10)
7 screw
(PTT2.6 × 10)
9 seven screws
(PTT2.6 × 10)
8 cord (with connector)
(ANT)
6 inverter ass’y
3 screw
(PTT2.6 × 10)
0 heat sink

– 11 –
SECTION 3
ASSEMBLY OF MECHANISM DECK
HOUSING
ARM (SUCTION)
Note: Follow the assembly procedure in the numerical order given.
A part
C part
B part
D part
8 Hold the hanger by
bending the claw.
6 Fit projection on D part.
4 Fit claw on B part.
3 Put the housing
under A part.
5 Fit projection on C part.
1 Install the catch to the hanger.
2 Install the hanger onto
two claws of the housing.
7 Holder the hanger by bending the claw.
hanger
housing
2 Move the arm (suction) in the arrow
direction and fit on projection.
1 Fit the arm (suction) on the shaft.
projection

– 12 –
LEVER (LDG-A)/(LDG-B)
GEAR (LDG-FT)
shaft A
shaft B
shaft C
1
Fit the lever (LDG-A) on
shafts A – C and install it.
shaft A
shaft B
2
Fit the lever (LDG-B) on
shafts
A and B and
install it.
3 type-E stop ring 2.0
gear (LDG-D)
5 gear (LDG-FT)
6 polyethylene washer
2 tension spring (LD-2)
2 tension spring (LD-1)
gear (LDG-FB)
lever (LDG-A)
hole
hole
4 Align hole in the gear (LDG-D)
with hole the lever (LDG-A).
3 Move the lever (LDG-B)
in the arrow direction.
1

– 13 –
GUIDE (C)
2 guide (C)
1 three claws
MOUNTING POSITION OF CAPSTAN/REEL MOTOR (M901)
two precision screws
(P2
× 2)
capstan/reel motor
(M901)
30˚

– 14 –
SECTION 4
MECHANICAL ADJUSTMENTS SECTION 5 ELECTRICAL ADJUSTMENTS
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the “power select” switch (S600) is “A (ON)” position.
2. Turn ON the regulated power supply. (All LEDs on the set
lights up, and the clock is displayed.)
Note: Press the [OFF] button, if the clock is not displayed.
3. Push the preset [4] button.
4. Push the preset [5] button.
5. Press the preset [1] button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
1. Push the [OFF] button.
2. Return the “power select” switch (S600) to initially set posi-
tion.
Tape Speed Adjustment
Setting:
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.
Specification: Constant speed
Adjustment Location: See page 18.
See the adjustment location from on page 18 for the
adjustment.
0 dB=0.775 V
TAPE DECK SECTION
Speed checker Frequency counter
–1.5 to +2.5% 2,955 to 3,075 Hz
set +–
test tape
WS-48A
(3 kHz, 0 dB)
LINE OUT REAR jack (CN780)
10 k Ω
speed checker
or
frequency counter
•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. 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.
•Torque Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A more than 90 g
(more than 3.18 oz)
Reverse CQ-403R more than 90 g
(more than 3.18 oz)
Mode Torque Meter Meter Reading
Forward CQ-102C 30 – 65 g•cm
(0.42 – 0.90 oz•inch)
Forward CQ-102C 0.5 – 4.5g•cm
Back Tension (0.01 – 0.06 oz•inch)
Reverse CQ-102RC 30 – 65 g•cm
(0.42 – 0.90 oz•inch)
Reverse CQ-102RC 0.5 – 4.5g•cm
Back Tension (0.01 – 0.06 oz•inch)
FF, REW CQ-201B 60 – 200 g•cm
(0.83 – 2.78 oz•inch)

– 15 –
Dolby Level Adjustment
Setting:
[SHIFT] button : ON (light up SET UP and
PLAY MODE)
Preset [4] (PLAY MODE)
n[5] (n) buttons : NR off
SOUND (BAS) button : Center
SOUND (TRE) button : Center
SOUND (BAL) button : Center
SOUND (FAD) button : Center
SOUND (VOL) button : Maximum
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV230 (L-CH) and RV240 (R-CH) so that the level
meter reading is –6±0.5 dB (0.37 to 0.41 V).
Adjustment Location: See page 18.
TUNER SECTION 0 dB=1µV
Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause 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 Stereo Separation Adjustment (WIDE)
3. FM Stereo Separation Adjustment (NARROW)
4. AM Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE] button : FM
FREQUENCY SELECT switch (E model): FM 200 k
Procedure:
1. Set to the test mode. (See page 14)
2. Push the [SOURCE] button and set to FM.
Display
3. Push the preset [3] button.
Display
4. Adjust with the volume RV2 on TUX10 so that the “FM” indi-
cation turns to “FM0” indication on the display window.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
Display
Adjustment Location: See page 18.
set +
–
test tape
P-4-D400
(400Hz, 0 dB) level mete
r
MAIN board
TP (DOLBY-L)/
TP (DOLBY-R)
      
set
antenna jack
FM RF signal
generator
Carrier frequency : 97.9 MHz
Output level : 22 dB (12.6
µ V)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%
)
0.01 µ F
SHUF
SHUF
SHUF

– 16 –
FM Stereo Separation Adjustment (WIDE)
Setting:
[SOURCE] button : FM
FREQUENCY SELECT switch
(E model) : FM 200 k
[SHIFT] button : ON (light up SET UP and
PLAY MODE)
Preset [4] (PLAY MODE)
n[5] (n) buttons : WIDE mode
Procedure:
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 24 dB
Adjustment Location: See page 18.
FM Stereo Level meter Level meter
signal generator connection reading (dB)
output channel
L-CH L-CH A
B
R-CH L-CH Adjust RV3 on TUX10
for minimum reading.
R-CH R-CH C
D
L-CH R-CH Adjust RV3 on TUX10
for minimum reading.
FM RF signal
generator
Carrier frequency : 97.9 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 33.75 kHz deviation (45%)
sub : 1 kHz, 33.75 kHz deviation (45%)
:19 kHz pilot: 7.5 kHz deviation (10%)
0.01 µ F
set
antenna jack
+
–
LINE OUT REAR jack
(CN780)
level meter
10 k
Ω
FM Stereo Separation Adjustment (NARROW)
Setting:
[SOURCE] button : FM
FREQUENCY SELECT switch
(E model) : FM 200 k
[SHIFT] button : ON (light up SET UP and
PLAY MODE)
Preset [4] (PLAY MODE)
n[5] (n) buttons : NARROW mode
Procedure:
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 18 dB
Adjustment Location: See page 18.
FM RF signal
generator
Carrier frequency : 97.9 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 33.75 kHz deviation (45%)
sub : 1 kHz, 33.75 kHz deviation (45%)
:19 kHz pilot: 7.5 kHz deviation (10%)
0.01 µ F
set
antenna jack
+
–
LINE OUT REAR jack
(CN780)
level meter
10 k
Ω
FM Stereo Level meter Level meter
signal generator connection reading (dB)
output channel
L-CH L-CH A
B
R-CH L-CH Adjust RV4 on TUX10
for minimum reading.
R-CH R-CH C
D
L-CH R-CH Adjust RV4 on TUX10
for minimum reading.

– 17 –
AM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE] n[MODE] buttons : AM
FREQUENCY SELECT switch (E model): AM 10 k
Procedure:
1. Set to the test mode. (See page 14)
2. Push the [SOURCE] button and set to FM.
3. Push the [MODE] button and set to AM.
Display
4. Push the preset [3] button.
Display
5. Adjust with the volume RV1 on TUX10 so that the “AM” in-
dication turns to “AM0” indication on the display window. But,
in case of already indicated “AM0”, turn the RV1 so that put
out light “0” indication and adjustment.
Display
Adjustment Location: See page 18.
AM RF signal
generator
Carrier frequency : 1000 kHz
30% amplitude
modulation by
1 kHz signal
Output level : 33 dB (44.7
µ
V)
(50 Ω )set
AM dummy antenna
30 Ω
15 pF
65 pF
antenna jack
SHUF
SHUF
SHUF

– 18 –
Adjustment Location:
– SET UPPER VIEW –
– SET BOTTOM VIEW –
TUX10
Tape Speed Adjustment
RV1 AM Auto Scan/Stop Level Adjustment
RV3 FM Stereo Separation Adjustment (WIDE)
RV4 FM Stereo Separation Adjustment (NARROW
)
RV2 FM Auto Scan/Stop Level Adjustment
RV240
(R-CH) RV230 (L-CH)
Dolby Level
Adjustment
TP (DOLBY-L)
TP (DOLBY-R) Dolby Level Adjustment

XR-C8220
05
TAPE EQUALIZER AMP,
DOLBY NR AMP, AMS
IC250
34
32
R-CH
FWD
IN (L)
FWD
L-CH
HP901
(PLAYBACK)
FWD
R-CH
REV
L-CH
REV
R-CH
REV
IN (L)
R-CH
R-CH R-CH R-CH
R-CH
D200
(METAL DETECT)
R-CH
EQ AMP 29 27 MUTE DOLBY
NR AMP
EQ
OUT TAPE
IN (L)
AMS
DET
+
113 102 116 114
N-ROUT
MTLIN
19
FWD/REV
18
MTL/NORMAL
17 16 20
MUTE/TAPE
Q250
MUTE SWITCH
DOLBY NR.ON
AMSON
103
AMSIN
AMS/PLAY
24
LCH
OUT
14
AMS
OUT
RV230
DOLBY LEVEL (L)
• SIGNAL PATH
: AM
: FM
: TAPE PLAY
SYSTEM CONTROLLER
IC600 (1/4)
REGULATOR
CONTROL SWITCH
Q202
CAPSTAN/REEL
MOTOR DRIVE
Q204
LM-EJ TAPEON LM-LOD CM-ON
VCC
REEL SENSOR B+ BATT B+
BATT B+
Q201
IN1
IN2
OUT1
OUT2
LOADING/TAPE OPERATION
MOTOR DRIVE
IC201
111
M
M
M901
(CAPSTAN/REEL) 9
7MOTOR
DRIVE 2
4
3
110 109
REGULATOR
Q203
112
LOADING/TAPE
OPERATION
TAPE OPERATION
SWITCH BUFFER
TAKE-UP
REEL
SENSOR
SUPPLY
REEL
SENSOR
REEL SENSOR BOARD (E Model)
REEL
104105 – 108
POS0 – POS3
TAPE
DETECT
EJECT/FF/REW/
REV/FWD MODE DETECT
(FM/AM ANTENNA) FM-ANT
AM-ANT
FM +B
FM B+
AM +B
AM B+
+B (FM/AM)
D10
FM/AM TUNER UNIT
TUX10
S-METER
LO/DX
VCO (FM/AM)
FM-IF-COUNT AM-IF-COUNT (SEEK)
VT (FM/AM) SD RECEIVE/SEEK
FM L-OUT
FM R-OUT
AM-DET OUT
R-CH R-CH
D50
MUTING
CONTROL SWITCH
Q51
A
B
FM/AM SIGNAL
METER BUFFER
Q13
WIDE
TUNMUTE
DSTSEL2
VSM
SD-IN
ST-MONO
FM/AM PLL
IC10
LO/DX
WIDE VSM SEEK SD ST/MONO
IF IN
FM OSC
AM OSC
PD
XOUT
XIN
X10
7.2MHz
D.IN D.OUT CLK CE
DATA-IN
DATA-OUT
CLK
CE
DATA-IN
DATA-OUT
CLK
CE
PLLSO
PLLSI
PLLCKO
PLLCE
WIDE/NARROW
SEEK OUT
WIDE/NARROW
SWITCHING
Q14
(Page 21)
(Page 21)
ST- IND
FM-L
AM
C
(Page 21)
TAPE-L
MUTING
Q50
MUTING
Q60
BAND-PASS
FILTER
IC50
LOW-PASS
FILTER
Q17
WIDE/NARROW
SWITCHING
Q15
51
5 6 4 2
20
1
9 13 16 15 18 7
4
1
2
21 11 65 24 19 13 20
8 10 9
22
12
16
18
5
342015326 2725 28
SEEKOUT
WIDE
VSM
SD
ST/MONO
SEEK
AM 9k/FM 50k
AM 10k/FM 200k
S601
FREQUENCY SELECT
– 19 – – 20 –
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM – TUNER/TAPE Section –

XR-C8220
– 21 – – 22 –
6-2. BLOCK DIAGRAM – MAIN Section –
05
INAO1 VOUT TCO1
VR
IN1 TIN1 FD
IN1 FNTO1
REO1
(Page 20)
(Page 20) AM
FM-L
INPUT SELECT,
ELECTRICAL VOLUME
IC301
ELECTRICAL VOLUME
(FOR SUBWOOFER)
IC350
LINE DRIVER
IC310
INPUT
SELECTOR
VOLUME
CONTROL
CIRCUIT
VOLUME
CONTROL
CIRCUIT
TONE
CONTROL
CIRCUIT
FADER
CONTROL
CIRCUIT
REFERENCE VOLTAGE
GENERATOR (FOR BIAS)
IC302
SUB CUT
SWITCH
Q360, 362
LOUDNESS
CONTROL
CIRCUIT SHIFT
REGISTER &
LATCH
VCT
BUFFER
CN780 (1/2)
BUS
AUDIO IN
L
RR-CH
CN781 (1/2)
FRONT
LINE OUT
CN780 (2/2)
REAR
LINE OUT
L
R
L
R
R-CH
R-CH
COM +8V
R-CH
R-CH
R-CH
R-CH
D351 D350
CE
DATA
CLK
VOLCE
DATA
CLK
VCT
GAIN
B
(Page 20) TAPE-L
C
22
16 2117
40
42
33 32 31
OUT1
VR
IN1
INP1 16 15
INAO1
BUFFER
1720
30 26 25 23
24 OUT1
OUT2
IN1
IN2 12
13
7
2
41
39
A
SHIFT
REGISTER &
LATCH
ZC
DET
CE
DATA
CLK
7
8 9
36 – 38
• SIGNAL PATH
: AM
: FM
: TAPE PLAY
: BUS AUDIO IN
AM-IN-L
AUX-IN-L
FM-IN-L
TAPE-IN-L
CN781 (2/2)
SUB OUT
L
R
R-CH
R-CH
R-CH
SUBCE
DATA
CLK
SUBCE
VOLCE
DATA
CLK
+MUTING
Q340
MUTING
Q430
MUTING
Q330
MUTING
Q440
MUTING
Q361
MUTING
Q461
22 MUTE
4
11
12
IN1
15 IN3
IN2
14 IN4
POWER AMP
IC700
5
3
21
23
OUT2+
OUT2–
OUT4+
OUT4–
7
OUT1+
OUT1–
17
19
OUT3+
OUT3–
CN700 (1/2)
(POWER CONNECTOR)
1
9
FRONT L (+)
FRONT L (–)
FRONT R (+)
FRONT R (–)
REAR L (+)
REAR L (–)
REAR R (+)
REAR R (–)
4
2
12
10
3
11
TEL-ATT
13
TEST MODE
15
9
POWER AMP
MUTE SWITCH
Q702
LEVEL SHIFT
Q603
MUTING
CONTROL SWITCH
Q700, 701
D717
66
VOLSO/SUBSO
VOLCKO/SUBCKO
67
62
SUB-SW0
SUB-SW1
61 68
SUBCE
VOLCE
MUTE
64
65
SD CSV-SO
2115
DOLBC 115
58
TEL-ATT 79
SYSTEM CONTROLLER
IC600 (2/4)
CSV
IC650
SI CSV-CKO
2214 CSV-CE
23
AOUT
R-CH 23
8
ST
NAR CSV-NAR
117
22
RESET 917
D715
TESTIN
CSV-RST
BUFFER
IC320
BUFFER
IC383
XT
X650
4.19MHz
2 3
XT
ST-BY