Sony XR-C5080R User manual

MICROFILM
SERVICE MANUAL
FM/MW/LW CASSETTE CAR STEREO
AEP Model
UK Model
Model Name Using Similar Mechanism XR-5800R
Tape Transport Mechanism Type MG-25G-136
SPECIFICATIONS
XR-C5080R/C5090R
Photo: XR-C5090R

– 2 –
TABLE OF CONTENTS
1. GENERAL
Location of Controls ....................................................... 3
Setting the Clock ............................................................. 3
Using the Rotary Commander ........................................ 4
Adjusting the Sound Characteristics .............................. 4
Attenuating the Sound .................................................... 4
Changing the Sound and Beep Tone............................... 4
Installation....................................................................... 5
Connections ..................................................................... 6
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. Printed Wiring Boards – MAIN Section – .................... 18
6-2. Schematic Diagram – MAIN Section –.......................... 21
6-3. Printed Wiring Board – PANEL Section – .................... 26
6-4. Schematic Diagram – PANEL Section –....................... 28
6-5. IC Pin Function Description ........................................... 34
7. EXPLODED VIEWS................................................ 37
8. ELECTRICAL PARTS LIST ............................... 40
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 –
FRONT PANEL ASS’Y
COVER ASS’Y
Note: Follow the disassembly procedure in the numerical order given.
SECTION 2
DISASSEMBLY
1 Push the button
(release).
2 Remove the front panel ass’y
to the direction of the arrow
A .
A
1
2
1
2
3
cover ass’y

– 10 –
SUB PANEL, MECHANISM DECK (MG-25G-136)
MAIN BOARD, HEAT SINK
1 three screws
(PTT2.6 × 8)
1 three screws
(PTT2.6 × 8)
2 sub panel
3 connector
(CN352)
5 screw
(PTT2.6 × 6)
6 mechanism deck
(MG-25G-136)
4 flexible flat cabl
e
(CN351)
1 two screws
(PTT2.6
× 8)
7 heat sink
6 three screws
(PTT2.6
× 10
)
6 three screws
(PTT2.6
× 10)
5 two screws
(PTT2.6
× 14)
1 screw
(PTT2.6
× 8)
2 rubber cap (25)
4 MAIN board
3 two ground point
screws

– 11 –
SECTION 3
ASSEMBLY OF MECHANISM DECK
HOUSING
Note: Follow the assembly procedure in the numerical order given.
ARM (SUCTION)
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

– 14 –
SECTION 4
MECHANICAL ADJUSTMENTS
•Tape Tension 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
See the adjustment location from on page 17 for the
adjustment.
0 dB=0.775 V
TAPE DECK SECTION
Speed checker Frequency counter
–1.5 to +2.5% 2,955 to 3,075Hz
SECTION 5
ELECTRICAL ADJUSTMENTS
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)
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)
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level andAM (MW)Auto Scan/Stop Level adjustments
can be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the “power select” switch (S801) is “A” 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 (S801) to initially set posi-
tion.
Tape Speed Adjustment
Setting:
Adjustment Location: See page 17.
set +–
test tape
WS-48A
(3 kHz, 0 dB)
speaker out terminal
4 Ω
speed checker
or
frequency counter
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

– 15 –
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 Noise Focus Adjustment.
3. FM Stereo Separation Adjustment.
4. FM Signal Meter Adjustment.
5. AM (MW) Auto Scan/Stop Level Adjustment.
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE] button: FM
Procedure:
1. Set to the test mode. (See page 14.)
2. Push the [SOURCE] button and set to FM.
Display
3. Adjust with the volume RV2 on TU1 so that the “FM” indica-
tion 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 17.
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level : 22 dB (12.6
µ V)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
0.01 µ F
set
antenna jack (J1)
FM INTRO
REG
INTRO
REG
FM Noise Focus Adjustment
Setting:
[SOURCE] button: FM
Procedure:
1. Tuner the 98.00 MHz.
2. The then output level is supposing that (A) dB.
3. Adjust with the volume RV3 on TU1 so that the output level is
(A) –32 ± 2 dB then signal generator input set to –20 dB.
Adjustment Location: See page 17.
FM Stereo Separation Adjustment
Setting:
[SOURCE] button: FM
Procedure:
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 TU1
for minimum reading.
R-CH R-CH C
D
L-CH R-CH Adjust RV4 on TU1
for minimum reading.
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 30 dB
Adjustment Location: See page 17.
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level : 60 dB (1 mV)
Mode : stereo
Modulation : 1 kHz, 75 kHz deviation (100%)
0.01 µ F
set
antenna jack (J1)
+
–
speaker out terminal
level meter
4
Ω
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 20 kHz deviation (26.7%)
sub: 1 kHz, 20 kHz deviation (26.7%)
:19 kHz pilot: 7.5 kHz deviation (10%)
0.01 µ F
set
antenna jack (J1)
+
–
speaker out terminal
level meter
4
Ω

– 16 –
FM Signal Meter Adjustment
Setting:
[SOURCE] button: FM
Procedure:
1. Set to the test mode. (See page 14.)
2. Push the [SOURCE] button and set to FM.
Display
3. Push the [6] button.
4. Adjust RV1 so that the display indication is “160”.
Display
Specification: Display indication: 158 to 162
Adjustment Location: See page 17.
AM (MW) Auto Scan/Stop Level Adjustment
Make this adjustment after “FM Auto Scan/Stop Level Adjust-
ment”.
Setting:
[SOURCE] button: MW
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 MW.
Display
4. Adjust with the volume RV1 on TU1 so that the “MW” indi-
cation turns to “MW0” indication on the display window.
But, in case of already indicated “MW0”, turn the RV1 so that
put out light “0” indication and adjustment.
Display
Adjustment Location: See page 17.
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level : 35 dB (56.2
µ V)
Mode : mono
Modulation : no modulation
0.01 µ F
set
antenna jack (J1)
INTRO
FM
FM INTRO
REG
AM RF signal
generator
Carrier frequency : 999 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 (J1)
999 @
MW INTRO
999
INTRO

– 17 –
Adjustment Location:
Tape Speed Adjustment
– SET UPPER VIEW –
TU1
RV1 AM (MW) Auto Scan/Stop Level Adjustmen
t
RV2 FM Auto Scan/Stop Level Adjustment
RV3 FM Noise Focus Adjustment
RV4 FM Stereo Separation Adjustment
RV1 FM Signal Meter Adjustment