Sony XR-4890 Manuale utente

MICROFILM

SERVICE MANUAL

US Model

Canadian Model

Model Name Using Similar Mechanism XR-C5100

Tape Transport Mechanism Type MG-25F-136

SPECIFICATIONS

XR-4890

Photo: XR-4890

FM/AM CASSETTE CAR STEREO

– Continued on next page –

– 15 – – 16 –

IC331 TDA7462D

SE3L

SE3R

MUTE

SDA

SCL

PAUSE

OUT FL

OUT FR

OUT RL

OUT RR

SUBOUT+

SUBOUT–

VDD

GND

CREF

SE1L

SE1R

MD+

MD–

CDL+

CDL–

CDR–

CDR+

PDR

PDGND

PDL

SE2L

SE2R

INPUT

GAIN &

AUTO

ZERO

PAUSE

DETECT

INPUT MULTIPLEXER &

MIXING STAGE

REAR SIDE

SELECTOR

FRONT SIDE

SELECTOR

LOUDNESS

CONTROL

CIRCUIT

INPUT

GAIN

BEEP

LOUDNESS

CONTROL

CIRCUIT

SOFT

MUTE

VOLUME

CONTROL

CIRCUIT

COMPANDER

TREBLE/

BASS

CONTROL

CIRCUIT

SUBWOOFER

OUT

FADER

SUBWOOFER

IIC

BUS

DIGITAL CONTROL CIRCUIT

POWER

SUPPLY

FRONT

FADER

FRONT

FADER

REAR

FADER

REAR

FADER

VOICE BANDPASS

HP LP

SDA

SCL

–

OVER VOLTAGE

PROTECT

REGULATOR

12 3 45 6 7 8 9 10 1211

MODE2

MODE1

STB

VDD

AMP

VCC

ANT

COM

GND

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

TAB

PW-GND

OUT2–

ST-BY

OUT2+

Vcc1

OUT1–

PW-GND1

OUT1+

SVR

IN1

IN2

S-GND

IN4

IN3

AC-GND

OUT3+

PW-GND3

OUT3–

Vcc2

OUT4+

MUTE

OUT4–

PW-GND4

DIAGNOSTICS OUT

IC661 BA3918-V2

IC751 TDA7385

• IC Block Diagrams – MAIN Board –

IC21 TB2118F (EL)

SECTION 6

DIAGRAMS

IC301 CXA2509AQ-T4

VDD

AMP

VDD2

12 3 45 6 7 8 9 10

24 23 22 21 20 19 18 17 16 15

11 12

14 13

OSC

DIN

DOUT

I/O-1

I/O-2

OUT-1

OUT-2

VDD2 IFC

VDD

FM IN

AM IN

D-GND

FM CP OUT

AM CP OUT

VCC

REG

A-GND

SERIAL

INTERFACE

I/O

PORT

OSCILLATOR

ON/OFF

BUFFER

REFERENCE

DIVIDER

PHASE

COMPARATOR

20BIT

IF COUNTER

PRESCALLER

12BIT

PROGRAMMABLE

COUNTER

–

REGULATOR

18BIT

18BIT 22BIT

40BIT SHIFT

REF

VCC

SEEK/RECP SEEK/RECP

–

SIG

4BIT SWALLOW

COUNTER

OUTPUT

PORT

–

+–

–

+–

12345 6 7 8 9 10

2122232627282930

2425

PBFB1

PBRIN1

PBREF1

PBFIN1

PBGND

VCT

PBFIN2

PBREF2

PBRIN2

PBFB2

PBEQ1

PBOUT1

VCC

TAPEIN1

AUXIN1

MSLPF

LINEOUT1

G2FB

G1FB

MSTC

DGND

MSOUT

INSW

TAPESW

MSMODE

DRSW

MSSW

LINEOUT2

DIREF

AUXIN2

TAPEIN2

PBEQ2

PBOUT2

GND

120µ/70µ

VCT

120µ/70µ24dB

LPF

VCC

DETECT

MS ON/

OFF

FWD/RVS

TAPE EQ

TAPE/AUX

NR BIAS

24dB

MODE

VCC

IN2

S-GND

IN1

OUT2

P-GND

OUT1

CONTROL

CIRCUIT

MOTOR

DRIVE

CIRCUIT

BUFFER

IC351 LB1930M-TLM

6-2. SCHEMATIC DIAGRAM — MAIN (1/2) SECTION — • Refer to page 15 for IC Block Diagrams.

– 19 – – 20 –

XR-4890/4900

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF

50 WV or less are not indicated except for electrolytics

and tantalums.

• All resistors are in Ωand 1/4W or less unless otherwise

specified.

•¢: internal component.

•C: panel designation.

•U: B+ Line.

• Powervoltageisdc14.4Vandfedwithregulateddcpower

supply from ACC and BATT cords.

• Voltage and waveforms are dc with respect to ground

under no-signal conditions.

no mark : FM

< > :TAPE PLAYBACK

∗: Impossible to measure

• VoltagesaretakenwithaVOM(Inputimpedance10 MΩ).

Voltage variations may be noted due to normal production

tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal production

tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F: FM

f: AM (MW)

E:TAPE PLAYBACK

•Waveforms

IC501 !§ XO

IC501 !™ OSC2

2.8Vp-p

18.432MHz

5.0Vp-p

32.768MHz

(Page 21, 22)

– 21 – – 22 –

XR-4890/4900 6-3. SCHEMATIC DIAGRAM — MAIN (2/2) SECTION —

• Refer to page 15 for IC Block Diagrams.

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF

50 WV or less are not indicated except for electrolytics

and tantalums.

• All resistors are in Ωand 1/4W or less unless otherwise

specified.

•¢: internal component.

•C: panel designation.

•U: B+ Line.

• Powervoltageisdc14.4Vandfedwithregulateddcpower

supply from ACC and BATT cords.

• Voltage and waveforms are dc with respect to ground

under no-signal conditions.

no mark : FM

< > :TAPE PLAYBACK

∗: Impossible to measure

• VoltagesaretakenwithaVOM(Inputimpedance10 MΩ).

Voltage variations may be noted due to normal production

tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal production

tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F: FM

f: AM (MW)

E:TAPE PLAYBACK

• Abbreviation

CND : Canadian model.

(Page 19, 20)

(Page 25)

– 25 – – 26 –

6-4. SCHEMATIC DIAGRAM — PANEL SECTION —

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF

50 WV or less are not indicated except for electrolytics

and tantalums.

• All resistors are in Ωand 1/4W or less unless otherwise

specified.

•¢: internal component.

•C: panel designation.

•U: B+ Line.

• Powervoltageisdc14.4Vandfedwithregulateddcpower

supply from ACC and BATT cords.

• Voltage and waveforms are dc with respect to ground

under no-signal conditions.

no mark : FM

< > :TAPE PLAYBACK

∗: Impossible to measure

(Page 22)

• VoltagesaretakenwithaVOM(Inputimpedance 10 MΩ).

Voltage variations maybe noteddue to normalproduction tol-

erances.

• Waveforms are taken with a oscilloscope.

Voltage variations maybe noteddue to normalproduction tol-

erances.

• Circled numbers refer to waveforms.

• Signal path.

F: FM

f: AM (MW)

E:TAPE PLAYBACK

– 27 –

6-6. IC PIN FUNCTION DESCRIPTION

• IC501 MASTER U-COM (MN101C12GTA1/MN101C12GTB)

Pin No.

1 AVREF- – Basic voltage (- side) ofAD conversion input

2 VSM I FM/AM common signal meter A/D conversion input terminal

3 KEYIN1 I

4 KEYIN0 I

5 DBAS IN I Position detecting AD input terminal of D-BASS

6 DSTSEL I Terminal for setting to select the value of destination

7 FUNC-SEL I Function selecting (AD conversion) input

8 NCO O Not used

9 RCIN0 I Rotary commander (AD conversion) input

10 AVREF+ I Basic voltage (+side) ofAD conversion input

11 VDD – Power supply

12 OSC OUT –

13 OSC IN –

14 GND – Ground

15 XT IN –

16 XT OUT –

17 GND – Ground

18 RCIN1 I Rotary commander shift input

19 SYSRST O SYSTEM RESET control output

20 BUSON O BUS ON control output

21 UNISO O Serial data output

22 UNISI I Serial data input

23 UNICKO O Serial clock output

24 UNICKI I Serial clock input

25 NCO O Not used

26 KEYACK I Key input acknowledge

27 NOSESW I Removing/attaching front panel detection input

28 BU_IN I BACK-UP detection input terminal

29 SIRCS I Remote control input

30 TELMUT I TELEPHONE MUTE detection input

31 TESTIN I Test mode setting input terminal

32 RAMBU I Reset detection input of RAM

33 RESET I Reset input terminal

34 VOLMUT O Not used

35 BEEP O Control output for buzzer

36 AMPMUT O Power amplifier mute control output terminal

37 AMPON O Power amplifier STANDBY control terminal

38 PLLCKD O PLL CLK output terminal

39 PLLCE O PLL CE output terminal

40 PLLSO O PLL DATA output terminal

41 PLLSI I PLL DATA input terminal

42 LCDSD O LCD serial data output

43 LCDCE O LCD chip enable output terminal

44 LCDCKD O LCD serial clock output

45 VOLSO O Electrical volume serial data output

46 NCO O Not used

47 VOLCKO O Electrical volume serial data output

48 ACCIN I Accessory power supply detection input

49 MUT O System MUTE control output

Pin Name I/O Function

KEY (AD conversion) input

Radiator (18.432 MHz) connecting terminal

Sub clock (for clock) radiator (32 kHz) connecting terminal

– 28 –

Pin No. Pin Name I/O Function

50 NCO O Not used

51 AMSON O “L” is output in AMS mode

52 NROUT O FOR/REV control output

53 MTLON I/O Metal control input/output

54 TAPMUT O Tape mute control output

55 DOLON I/O Dolby control input/output

56 AMSIN I Input to detect existence of song during AMS mode

57 to 75 NCO O Not used

76 ST I/O Combination stereo input and monaural output

77 SD_IN I SIGNAL DETECTOR input terminal

78 REIN 1 I

79 REIN 0 I

80 AD ON O Power supply control output of AD conversion

81 PW SEL I Power selection initialise

82 ILLON O Illumination power supply control output

83 REL I Input to detect rotation of reel table

84 POS3 I

85 POS2 I

86 POS0 I

87 POS1 I

88 LM LOD O Loading motor control output (to a direction of loading)

89 LM EJ O Loading motor control output (to a direction of ejection)

TAPE power supply control output

When ‘on’ is output, “H” is output, otherwise when ‘off’ is output, “L” is output.

91 CM ON O Capstan motor control signal output terminal of TAPE

92 PW ON O System power supply control output

93 FM ON O FM power supply control output terminal

94 TUNON O TUNER power supply control output terminal

95 DAVSS – Ground

96 to 99 NCO O Not used

100 DAVDD – Not used (Power supply for DA converter)

Tape position signal detection input

Rotary encoder input terminal

90 TAPON O

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