Sony XR-C340 User manual

MICROFILM
EXR-C205/XR-C340
US Model
Canadian Model
EXR-C205
E Model
XR-C340
SERVICE MANUAL
FM/AM CASSETTE CAR STEREO
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type
MG-25A-136
Refer to RM-X2S/X3S SERVICE MANUAL (9-960-039-∏)
issued previously for information of remote commander
(RM-X2S) supplied with XR-C340.
Photo : XR-C340
Specifications
Cassette Player section
Tape track 4-track 2-channel stereo
Wow and flutter 0.08% (WRMS)
Frequency response 30-18,000 Hz
Signal-to-noise ratio 58 dB
Tuner section
FM
Tuning range EXR-C205:
87.5-107.9 MHz
XR-C340:
FM tuning interval:
50 kHz/200 kHz
switchable
87.5-108.0 MHz
(at 50 kHz step)
87.5-107.9 MHz
(at 200 kHz step)
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity 8 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),
68 dB (mono)
Harmonic distortion at1 kHz 0.5% (stereo),
0.3% (mono)
Separation 35 dB at 1 kHz
Frequency response 30-15,000 Hz
Capture ratio 2 dB
AM
Tuning range EXR-C205
530-1,710 kHz
XR-C340
AM tuning interval:
9 kHz/10 kHz switchable
531-1,602 kHz
(at 9 kHz step)
530-1,710 kHz
(at 10 kHz step)
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity 30 µV
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4-8 ohms
Maximum power output 35 W × 4 (at 4 ohms)
General
Outputs Power antenna control
lead/Power amplifier
control lead/Telephone
mute control lead (XR-C340 only)
Rear line out (1)
Tone controls Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
Power requirements 12V DC car battery
(negative ground)
Dimensions Approx. 188 × 58 × 184 mm
(w/h/d)
Mounting dimensions Approx. 182 × 53 × 164 mm
(w/h/d)
Mass Approx. 1.3 kg
Supplied accessories Parts for installation and
connections (1set)
Front panel case (1)
Rotary remote RM-X2S
(XR-C340 only)
Design and specifications are subject to change without
notice.

– 2 –
TABLE OF CONTENTS
1. GENERAL ................................................................... 3
Location of Controls ........................................................ 3
Resetting the Unit ............................................................ 3
Detaching the Front Panel ............................................... 3
Preparing the Rotary Remote .......................................... 3
Setting the Clock ............................................................. 4
Using the Rotary Remote ................................................ 4
Adjusting the Sound Characteristics ............................... 5
Muting the Sound ............................................................ 5
Changing the Sound and Beep Tone................................ 5
Installation ....................................................................... 6
Connections ..................................................................... 7
2. DISASSEMBLY.......................................................... 10
3. ASSEMBLY OF MECHANISM DECK ........... 12
4. MECHANICAL ADJUSTMENTS ....................... 15
5. ELECTRICAL ADJUSTMENTS ...................... 15
6. DIAGRAMS
6-1. IC Pin Function Description ............................................ 16
6-2. Printed Wiring Board –MAIN Section– ......................... 20
6-3. Schematic Diagram –MAIN Section–............................ 23
6-4. Printed Wiring Board –KEY Section– ........................... 27
6-5. Schematic Diagram –KEY Section– .............................. 29
7. EXPLODED VIEWS .......................................... 31
8. ELECTRICAL PARTS LIST................................ 34
SERVICING NOTES
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 –

– 10 –
Note: Follow the disassembly procedure in the numerical order given.
FRONT PANEL ASS’Y
SECTION 2
DISASSEMBLY
2
1
1
2
1 Push the button
(release).
2 Remove the front panel ass’y
to the direction of the arrow A .
A
COVER ASS’Y
1
2
3 cover ass’y

– 11 –
SUB PANEL, MECHANISM DECK (MG-25A-136)
MAIN BOARD, HEAT SINK
2 two ground point
screws
5 screw
(PTT2.6 × 6)
3 connector
(CN302)
6 mechanism deck
(MG-25A-136)
4 flexible flat cable
(CN301)
2 sub panel
1 three screws
(PTT2.6 × 8)
1 three screws
(PTT2.6 × 8)
4 eight screws
(PTT2.6 × 10)
1 screw
(PTT2.6 × 8)
5 heat sink
3 main board
1 two screws
(PTT2.6 × 8)

– 12 –
2 Install the hanger onto
two claws of the housing.
1 Install the catch to the hanger.
7 Hold the hanger by bending the claw.
A part
B part
C part
D part
8 Hold the hanger by
bending the claw.
3 Put the housing
under A part.
4 Fit claw on B part.
6 Fit projection on D part.
5 Fit projection on C part.
hanger
SECTION 3
ASSEMBLY OF MECHANISM DECK
housing
Note: Follow the assembly procedure in the numerical order given.
HOUSING
2 Move the arm (suction) in the arrow
direction and fit on projection.
1 Fit the arm (suction) on the shaft.
projection
ARM (SUCTION)

– 13 –
1 Fit the lever (LDG-A) on
shafts A – C and install it.
shaft A
shaft C
4 type-E stop ring 2.0
LEVER (LDG-A) / (LDG-B)
shaft B
GEAR (LDG-FT)
3 Align hole in the gear (LDG-D)
with hole in the lever (LDG-A).
gear (LDG-FB)
hole
gear (LDG-D)
lever (LDG-A)
2 Move the lever (LDG-B)
in the arrow direction.
1 tension spring (lever LDG)
4 gear (LDG-FT)
5 polyethylene washer
hole
2 Pull the lever in the
arrow direction.
shaft A
shaft B
3 Fit the lever (LDG-B) on
shafts A and B and
install it.

– 14 –
GUIDE (C)
2 guide (C)
1 three claws

– 15 –
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
1. Clean the following parts with a denatured-alcohol-moistened
swab: playback head pinch roller
rubber belt capstan
idlers
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 Torqu 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)
•TapeTension Measurement
set +–
test tape
WS-48A
(3 kHz, 0 dB)
speaker out terminal
4 Ω
speed checker
or
frequency counter
0 dB=0.775 VTAPE DECK SECTION
Tape Speed Adjustment
Procedure:
1. Put the set into the FWD PB mode.
Speed checker Frequency counter
–1.5 to +2.5% 2,955 to 3,075 Hz
Specification: Constant speed
Adjustment Location:
– SET UPPER VIEW –
TAPE SPEED Adjustment
Mode Torqu Meter Meter Reading
Forward CQ-102C 30–65 g•cm
(0.42–0.90 oz•inch)
Forward CQ-102C 0.5–4.5 g•cm
Back Tension (0.01–0.06 oz•inch)
Reverse CQ-102RC 30–65 g•cm
(0.42–0.90 oz•inch)
Reverse CA-102RC 0.5–4.5 g•cm
Back Tension (0.01–0.06 oz•inch)
FF, REW CQ-201B 60–200 g•cm
(0.83–2.78 oz•inch)

– 16 –
1 ILLIN I ILLIN signal detection pin
2, 3 POS3, 2 I Tape position detection pin
4, 5 POS0, 1
6 TAPEON O Tape power supply control pin
7 CM_ON O Capstan motor control pin
8 LM_LOD O Loading motor control pin (loading direction)
9 LM_EJ O Loading motor control pin (eject direction)
10 TUNON O Tuner power supply control pin
11 FM_ON O FM power supply control pin
12 PW_ON O System power supply control pin
13 MUT O System muting control pin At muting: “H”
14 VOLCE O Chip enable output pin to electrical volume
15 VOLCLO O Clock output pin to electrical volume
16 VOLSO O Data output pin to electrical volume
17 AMPON O Power amp power supply control pin
18 AMPMUT O Power amp muting control pin At muting: “L”
19 DX_LO O DX/local selection control pin
20 AM_MONO O AM forced monaural signal output pin
21 GND – GND
22 DSTSEL I Destination setting pin (A/D input)
23 D-BASS I D-BASS switch input pin (A/D input)
24, 25 KEYIN1, KEYIN0 I Key input pin (A/D input)
26 RC_IN0 I Rotary remote commander input pin (A/D input)
27 VSM I FM/AM signal meter voltage detection pin (A/D input)
28 AMIFIN I AM (MW, SW) IF input pin
29 FMIFIN I FM IF input pin
30 VDD2 – Power supply
31 FM_OSC I FM OSC signal input pin
32 AM_OSC I AM OSC signal input pin
33 GND – GND
34 N.C – Not used
35 EOI O Main charge-pump output pin
36 TEST0 I Test pin
37 AM_STIN I AM stereo signal input pin
38 SEKOUT O SEEK control signal output pin
39 MW_SW O MW/SW power supply select pin
40 BEEP O Beep sound output pin
41 KEYACK O Key acknowledge signal input pin
42 BU_IN I Back up power supply detection pin
43 MTLSEL I/O
METAL control input/output pin
At initial mode: auto/manual selection input of METAL function “L”: manual
At manual mode: METAL on/off output “H”: on
At auto mode: input at %ª MTLIN
SECTION 6
DIAGRAMS
Pin No. Pin Name I/O Function
6-1. IC PIN FUNCTION DESCRIPTION
• IC501 µD17708GC-545-3B9 (MASTER CONTROLLER)

– 17 –
Pin No. Pin Name I/O Function
44 DOLON I/O
DOLBY control input/output pin
At initial mode: valid/invalid selection input of DOLBY function
At normal mode: DOLBY on/off output
45 AMSIN I Tape mucic with/without detection pin “L”: with music
46 ST I/O Stereo detection signal input and forced monaural signal output pin
47 AMS_ON O At AMS: “L”
48 N_ROUT O Forward/reverse control pin
49 TAPMUT O Tape muting control pin At muting: “H”
50 ILLON O
Illumination power supply control pin
At PW SEL on: ACC on: “H”
At PW SEL off:ACC on: “H”
51 SD_IN I Station detection signal input pin
52 NOSESW I Front panel removal or attaching detection pin
53 TELMUT I Telephone muting detection pin “L”: 20dB audio muting
54 REL I Reel table rotation detection pin
55 ACCIN I Accessory voltage detection pin
56 TESTIN I Test mode setting pin
57 RC_IN1 I Rotary remote commander input pin (A/D input)
58 PW_SEL I Power select switch input pin
59 MTLIN I AUTO METAL detection pin “L”: METAL (Fixed at “H” in this set)
60 AD_ON O Power supply control pin for A/D conversion
61 KEYSEL I Key function setting pin
62 SOUTSEL I Active select pin for #• SEKOUT
63 COLORSEL I Illumination color setting pin “L”: amber,“H”: green
64 LCDCE O LCD chip enable output pin
65 LCDCKO O LCD clock output pin
66 LCDSO O LCD data output pin
67 LCDINH O LCD brank indication control pin
68 UNICKI I Clock input pin (for SONY BUS)
69 UNISO O Data output pin (for SONY BUS)
70 UNISI I Data input pin (for SONY BUS)
71 UNICKO O Clock output pin (for SONY BUS)
72 BUSON O BUS ON control signal output pin (for SONY BUS)
73 SYSRST O System reset signal output pin
74 VREG O CPU regurator output pin
75 GND – GND
76 X_OUT O System clock output pin (4.5MHz)
77 X_IN I System clock input pin (4.5MHz)
78 CE I Fixed at “L”
79 VDD1 – Power supply
80 RESET I Reset input pin

– 18 –
• IC Block Diagrams
(MAIN BOARD)
IC331 LC75373ED
IC301 CXA2509AQ-T4
+
–
+
–
+–
+
–
+–
12345 6 7 8 9 10
20
19
18
17
16
15
14
13
12
11
2122232627282930
31
32
33
34
37
38
39
40
2425
PBFB1
PBRIN1
PBREF1
PBFIN1
35
36
PBGND
VCT
PBFIN2
PBREF2
PBRIN2
PBFB2
PBEQ1
PBOUT1
VCC
TAPEIN1
AUXIN1
MSLPF
LINEOUT1
NC NC
G2FB
G1FB
MSTC
DGND
MSOUT
NC
NC
INSW
TAPESW
MSMODE
DRSW
MSSW NC NC LINEOUT2 DIREF AUXIN2 TAPEIN2 PBEQ2 PBOUT2 GND
F2
120µ/70µ
X1
X1
VCT
+
F1
120µ/70µ24dB
F3
LPF
VCC
DETECT
MS ON/
OFF
FWD/RVS
TAPE EQ
TAPE/AUX
NR BIAS
24dB
MS
MODE
T2
T1
+
–
+
–
+
–
+
–+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–+
–
+
–
+
–
+
–
DECODER LATCH SHIFT
REGISTER CONTROL
–
+
+
–
12 3 45 6 7 8 9 10
20
19
18
17
16
15
14
13
12
11
21
22
2324252627282930313233
34
35
36
37
38
39
40
41
42
43
44
LSELO
L4
L3
L2
L1
VDD
R1
R2
R3
R4
RSELO
RVRIN
RCOM
RT1 RT2 RT3
RTOUT
RSIN
RS1 RS2 RS3
RSOUT
RFIN
RFOUT
RROUT
VSS
CL
DI
CE
VREF
LROUT
LFOUT
LFIN
LSOUT
LS3 LS2 LS1 LSIN LTOUT LT3 LT2 LT1 LCOM LVRIN

– 19 –
IC351 MM1322XFBE • Waveform
IC611 BA3918-V2
IC581 BA8270F-E2
1IC501 &¶
1
2
3
4
5
6
7
8OUT2
VS
OUT1
GND
IN1
VCC
IN2
GND
CONTROL CIRCUIT
1
2
3
4
5
6
7 8
9
10
14
13
12
11
BUS ON
SWITCH
RESET
SWITCH
BATTERY
SWITCH
BUS ON
RST
BATT
CLK
VREF
DATA
GND
VCC
RST
BUS ON
CLK IN
BU IN
DATA IN
DATA OUT
+
–
+
–
+
–
+
–
OVER VOLTAGE
PROTECT
REGULATOR
12 3 45 6 7 8 9 10 1211
NC
MODE2 MODE1
STB
VDD
AMP
VCC ANT
COM
AM
FM
GND
3.2 Vp-p
222 ns