Rotel RT-955 Manual de usuario

Technical

Manual

AM/FM STEREO TUNER

RT-955

Table of Contents

Specification

Specification......................................1

Parts List ...........................................2~5

Adjustment........................................6~12

PCB Assembly ..................................13~15

Schematic Diagram ..........................16~22

FM Tuner

Usable Sensitivity: 12.2 dBf

50dB Quieting Sensitivity: 20.2 dBf (mono)

45.3 dBf (stereo)

Signal to Noise Ratio (at 65 dBf): 75 dBf (mono)

72 dBf (stereo)

Harmonic Distortion (at 65 dBf): 0.2 % (mono)

0.3 % (stereo)

Frequency Response: 10 Hz - 15 kHz, ±3 dB

Capture Ratio: 2.0 dB

Alternate Channel Selectivity: 47 dB (±400 KHz)

Spurious Response Ratio: 90 dB

Image Rejection Ratio: 80 dB

IF Rejection Ratio: 80 dB

AM Suppression Ratio: 55 dB

Stereo Separation (100Hz/1 KHz/10 KHz): 40 dB/45 dB/35 dB

Output level: 1.2V

Antenna Input: 75 ohms unbalanced

AM Tuner

Usable Sensitivity: 300 μV/m

Selectivity: 25 dB

Harmonic Distortion : 0.5 %

Image Rejection Ratio: 45 dB

Signal to Noise Ratio: 48 dB

Output level: 165 mV

Antenna Input: Loop Antenna

General

Power Consumption: 10 Watts

Power Requirements (AC): 120 volts, 60 Hz (USA version)

230 volts, 50 Hz (European version)

Weight: 3.7 kg/8.2 lb.

Dimensions (W x H x D): 440 x 72 x 286 mm

173/8" x 27/8" x 111/4"

SHINSEN-BLD. 4F 10-10 SHINSEN-CHO, SHIBUYA-KU,

TOKYO 150-0045, JAPAN

Serial. NO.

Beginning

Quality Uncompromised

Y-329A-00065C/S-S

Parts List-1

ANT200

ANT201

C201.202

C203

C204

C205.206

C207-210

C211.212

C213

C214

C215

C216

C217

C218

C219

C221

C222

C223-236

C237

C238-241

C242

C243

C245.246

C247

C248

C249

C250.251

C252

C253

C254

C255

C257

C259

C260

C261

C262

C263

C264.265

C266

C267

C268.269

C270

C271

C272

C273

C274

C275

C276

C278.279

C280

C281

C282-284

C285

C301

C302

X-1273-01 PCB ASSEMBLY

ANTENNA TERMINAL 1P

ANTENNA TERMINAL 3P

0.01UF

0.022UF

100UF/16V

33PF-CH

1000PF

0.022UF

0.01UF

3.3UF/50V

0.022UF

100UF/16V

0.022UF

47UF/16V

0.022UF

47UF/16V

0.022UF

100PF

0.047UF

150PF

0.022UF

1UF/50V

0.022UF

1UF/50V

0.022UF

100UF/16V

0.022UF

1UF/50V

0.047UF

0.022UF

0.047UF

680PF

0.47UF/50V

1UF/50V

0.047UF

1UF/50V

0.01UF

0.022UF

0.47UF/50V

4.7UF/50V

0.047UF

0.01UF

0.022UF

10UF/50V

68PF

330PF

10UF/50V

270PF

33UF/35V

100UF/16V

0.022UF

470PF-POLY

18PF-CH

ANTENNA-A

ANTENNA-B

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR(CH TYPE)

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

FILM CAPACITOR

CERAMIC CAPACITOR(CH TYPE)

C304

C306-308

C309

C311.312

C313

C314

C316

C317

C318

C319

C321

C322

C323.324

C325

C326

C327

C328

C329

C330

C401

C402-404

C405.406

C407.408

C409

C411

C412

C413

C414

C415.416

C417

C501

C502

C503

C504

C505

C506.507

C508

C509

C511

C512

C513.514

C515

C516

CL201.202

CL203

CL204

CL271

CL273

CL277

CR201.202

CR203

CR204

CR271

CR273

CR277

0.047UF

0.022UF

220PF

0.022UF

47UF/16V

0.022UF

1000PF

0.047UF-M

0.056UF-M

0.022UF

100UF/16V

0.01UF

0.022UF

3.3UF/50V

4.7UF/50V

1UF/50V

470PF

0.047UF

0.022UF-M

0.022UF

47UF/16V

0.0033UF

0.01UF

10UF/50V

4.7UF/50V

10UF/50V

4.7UF/50V

0.022UF-M

0.0033UF-M

0.0068UF-M

3300UF/35V

47UF/50V

0.068UF-M

4.7UF/50V

0.068UF-M

0.022UF

10UF/50V

0.022UF

47UF/16V

220UF/16V

47UF/16V

47UF/35V

2.2UF/50V

22UF/16V

0.0039UF-M

1000PF

270PF

120PF

100PF

22UF/16V

0.0039UF-M

1000PF

270PF

120PF

100PF

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

MYLAR CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

MYLAR CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

MYLAR CAPACITOR

ELECTRIC CAPACITOR

MYLAR CAPACITOR

ELECTRIC CAPACITOR

MYLAR CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

MYLAR CAPACITOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

MYLAR CAPACITOR

CERAMIC CAPACITOR

SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION

Parts List-2

CF201.202

CF203

CF204

CF205

CF301

D201

D202-205

D208

D209-212

D301.302

D303-305

D307.308

D401

D501-505

D506

D507

D508

D509

D510

D511

F501.502

FFE200

IC201

IC202

IC203

IC204

IC205

IC301

IC401

IC501

✰

ICM101

J321

JACK1

JACK2

L201-206

L207

L500

LFL200

LFR200

Q201.202

Q204

Q206.207

Q209

Q211

Q212

Q213-216

Q219

Q222

Q223

Q225

Q301

Q302

Q501

Q502

FM FILTER 10.7MM-A

FM FILTER 10.7MJA10-A

FM FILTER 10.7MM-A

CSB456F11

SFPS450H

1N4004

1N4148

ZENER 5.1V

1N4148

KV1236Z

1N4148

ZENER 5.1V

1N4004

ZENER 30V

ZENER 6.2V

ZENER 12V

1N4148

ZENER 5.6V

1N4004

036 5ST500

FTA4-460H

LC72191M

LA1235

LA3450

NJM072DE

LA1245

LA2230

NJM317F

HEAT SINK(24X17X30)

LTV817

4.7K

MINI JACK

RCA 2P

56UH

20.8MH

56UH

KLM5B2-T

KTC3198Y

DTA114Y

2SC1740S

2SK192GR

KTC3195Y

KTC3198Y

DTC114Y

2SK117

DTA114Y

2SK192GR

DTA114Y

DTC114Y

BKTA1267Y

FM IF CERAMIC FILTER

CERAMIC RESONATOR

FILTER FOR AM

SWITCHING DIODE

ZENER DIODE

SWITCHING DIODE

VARACTOR DIODE

SWITCHING DIODE

ZENER DIODE

SWITCHING DIODE

ZENER DIODE

SWITCHING DIODE

ZENER DIODE

SWITCHING DIODE

MINI FUSE 250V T500MA

FM FRONT-END

PLL IC

SIGNAL METER IC

FM IF IC

MPX IC

DUAL OP AMP

AM IF IC

RDS IC

REGULATOR IC

REG.IC HEAT SINKER

PHOTO COUPLER IC

RESISTOR 5%

MULTI-ROOM JACK

RCA JACK

INDUCTOR

FTZ COIL

INDUCTOR

MPX LPF COIL

TRANSISTOR

FET

TRANSISTOR

FET

TRANSISTOR

FET

TRANSISTOR

Q503

Q504

Q505

Q506

QL201

QR201

R201

R202

R203.204

R205

R207.208

R211-213

R214-218

R222

R223

R224

R225

R226

R231.232

R233

R236

R238

R239

R240

R241

R242

R243

R244

R245

R246

R247

R248

R249

R250

R257.258

R259

R260

R261

R262

R263

R264

R265.266

R271

R272.273

R274

R275

R276

R277

R278

R279

R281

R282

R283

R284.285

R286

KTC3198Y

DTC114Y

DTA114Y

KTC3198Y

KTD1303

4.7K

82R

100K

220R

560R

10K

5.6K

330R

220R

330R

27K

330R

150R

470R

330R

15K

390R

6.8K

3.3K

22R

390R

330R

4.7K

330R

6.8K

3.3K

39R

390R

330R

4.7K

330R

100K

18K

47K

10R(1W)

10K

3.3K

18K

10K

120K

3.3K

TRANSISTOR

RESISTOR 5%

WATT RESISTOR

RESISTOR 5%

SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION

Parts List-3

R288

R289

R291.292

R297

R298

R299

R300

R301.302

R303

R304

R305

R306.307

R308

R309

R311

R312

R313

R314

R316.317

R318

R319

R320

R321

R401.402

R403

R404

R405

R406

R407

R408

R409

R410

R411

R412

R413

R501

R502

R503

R504

R505

R506

R507

R508

R509

R511

R513

R514

R515

R516

R517

R518

R519

R520

RL201

RL202

5.6K

10K

100K

4.7K

22R

1.5K

100K

100R

820R

470R

220R

10K

100K

100R

4.7K

220R

82R

10K

100K

10K

560R

680R

5.6K

3.3K

10K

33K

10K

22K

4.7K

10K

82R

270R

200R

1.8K

330R(1W)

10K

270R(1W)

22K

10K

100R

12K

10K

4.7K

56K

47K

3.3K

6.8K

RESISTOR 5%

WATT RESISTOR

RESISTOR 5%

WATT RESISTOR

RESISTOR 5%

RL203

RL204

RL205

RL206

RL294

RL295

RM101

RR201

RR202

RR203

RR204

RR205

RR206

RR294

RR295

RLY201.202

TC301

TC302

TL201

TL202

TL301

TL302

TL303

TL304

VR201

VR203

VR204

VR205

VR206

VR301

VR401

XTL201

XTL401

C101-107

C110.111

C112

C113

C114.115

C116

C117

C118

C119

C121

D101-107

D118

ENC101

FL101

Q101

R101-135

R136

R137-143

R146-149

R150.151

8.2K

470R

100K

3.3K

180K

100K

270R

3.3K

6.8K

8.2K

470R

100K

3.3K

180K

100K

G5A-237P DC12V

TRIMER 10P(WHITE)

TRIMER 20P(RED)

FM-DET-A

FM-DET-B

AM-OSC1

AM-ANT2

AM-IFT1

AM-IFT2

VR.47K

VR.22K

VR.1M

VR.470K

VR.4.7K

VR.22K

VR.10K

XTAL 7.2MHZ

CSB456F15

X-1273-02 PCB ASSEMBLY

100PF

0.047UF

22UF/16V(SE TYPE)

0.1UF

820PF

0.1UF

820PF

1000PF

100PF

0.1UF

1N4148

EC16B24202

SVR-12MM18(35S/12G)

KTC3198Y

120K

10K

1K2

47K

2R2

RESISTOR 5%

RELAY

VARIABLE CAPACITOR

FM DET.COIL

AM OSC.COIL

AM ANT.COIL

AM IFT COIL

VARIABLE RESISTOR

CRYSTAL

CERAMIC RESONATOR

CERAMIC CAPACITOR

ELECTRIC CAPACITOR

CERAMIC CAPACITOR

SWITCHING DIODE

VR ENCODER

VFD FOR RDS/RBDS

TRANSISTOR

RESISTOR 5%

SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION

Parts List-4

R152

R155.156

R157

R158-163

R164

SW101-112

SW114-116

SW118-120

SW122-124

SW126-128

U101

U102

XT101

CM101

QM101

RM102

RM103

RM104

RMC201

C540

SW201

TF201

10K

47K

10K

1K2

TACT SWITCH(SKHVBH)

CXP82832-182Q

AT24C16

CST10.00MTW

X-1273-03 PCB ASSEMBLY

10UF/16V(SE TYPE)

KTC3198Y

100R

150R

4.7K

CRV1M352-00B

X-1273-04 PCB ASSEMBLY

0.0047UF/400V

POWER SW.TV-5

X-1273-05 PCB ASSEMBLY

022 T-1065N01

RESISTOR 5%

TACT SWITCH

CPU

EEP ROM

RESONATOR 10.0MHZ

ELECTRIC CAPACITOR

TRANSISTOR

RESISTOR 5%

REMOTE CONTROL SENSOR

SPARK KILLER(AC CERAMIC)

SWITCH

POWER TRANSFORMER

C601-605

D601-604

IC601

JACK3

X-1273-06 PCB ASSEMBLY

1UF/50V

ZENER 12V

MAX232CPE

DB9 JACK(MALE)

OTHERS

011 FP-504

012 SK4-06A00

012 4TQF-15

014 C-4550A02

014 4TQN-12B#5

015 RP-360

019 4TSH-19#2

021 RLA145A00

034 SEL1124R

069 C-4629A01

072 4TR-2489

072 4TR-2875

072 4TR-3228

072 C-4620A01

072 C-4622A01

072 C-4623A01

072 C-4624A01

081 SK4-10A00

081 TZ-164-1

092 RR-T91

ELECTRIC CAPACITOR

ZENER DIODE

RS232 DRIVER IC

DB9 JACK

FRONT PANEL ASSY

KNOB 33F

POWER BUTTON 14X14

UPPER COVER

BOTTOM BOARD

PRINTED REAR CHASSIS

PLASTIC FOOT 50F

AM LOOP ANTENNA

LED

AC INLET

3.5MM PLUG SHIELD CORD

RCA PIN CORD

T TYPE ANTENNA

AC CORD SET for STD

AC CORD SET for AUSTRALIA

AC CORD SET for UK

AC CORD SET for CEE

INSIDE CARTON

STYROL SIDE MOULDING

REMOTE UNIT

SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION

Adjustment

■ FM

* Necessary measurement equipment

RDS/STEREO Multiplexer 1 unit

FM/AM Signal Generator 1 unit

Audio Signal Analyzer 1 unit

Oscilloscope 1 unit

Digital Volt Meter (DVM) 1 unit

(A) Center adjust

❏ RDS/STEREO Multiplexer Setting

– MODE : MONO

– Audio Frequency : 1KHz

❏ FM Signal Generator Setting

– Deviation : 75KHz

– Radio Frequency : 98.0MHz

– Output Level : 66dB

❏ RT955 Setting

– FM Frequency : 98.0MHz

– Antenna Selection : A

– FM MODE : MONO

– IF MODE : WIDE

qTurn FM Signal Generator Modulation on

wConnect DVM (+)(-) terminals to both ends of resistor R282 and measure the volt.

eMake this measured volt '0' by adjusting TL201(FM-DET-A Coil).

(The adjustment should be within ±2mV)

rAfter this adjustment, measure THD(Total Harmonic Distortion) with Audio

Signal Generator.

tAdjust THD to minimum point with TL202(FM-DET-B Coil).

(THD should be within 0.5%)

Oscilloscope

Monitor Audio

Signal

Analyzer

L-CH

(or R-CH)

Jack 2 Ant-B

(ANT 201)

Ant-A

(ANT 200)

Signal

Generator

Stereo

Multiplexer

DVM

(+)

(-)

IC 203

BACK

FRONT

(FM-DET-B)

TL 202

TL 201

(FM-DET-A) R 282

(B) Channel Separation adjust

❏ RDS/STEREO Multiplexer Setting

– MODE : STEREO (ONLY L-CH Signal OUT)

– Audio Frequency : 1KHz

❏ FM Signal Generator Setting

– Deviation : 75KHz

– Radio Frequency : 98.0MHz

– Output Level : 66dB

❏ RT955 Setting

– FM Frequency : 98.0MHz

– Antenna Selection : A

– FM MODE : STEREO

– IF MODE : WIDE

qTurn FM Signal Generator Modulation on after modulating only L-CH

at STEREO Multiplexer.

wConfirm if 'STEREO' indicator is turned 'ON' on the display in the WIDE MODE.

eMeasure output level via Audio Signal Analyzer and make the level as standard.

rTurn FM Signal Generator Modulation on after modulating only R-CH

at STEREO Multiplexer.

tMeasure output level via Audio Signal Analyzer (measure per a dB)

yAdjust output level to minimum position with VR204 (WIDE MODE CH-SEPA. ADJ.).

(lower than -40dB)

uChange RT955 IF MODE to NARROW.

iRepeat the above q~t

oAdjust output level to minimum point with VR205(NARROW MODE CH-SEPA. ADJ).

(lower than -38dB)

Oscilloscope

Monitor Audio

Signal

Analyzer

L-CH

(or R-CH OPEN)

Jack 2 Ant-B

(ANT 201)

Ant-A

(ANT 200)

Signal

Generator

Stereo

Multiplexer

VR 204

(Wide) VR 205

(Narrow)

IC 204

BACK

FRONT

❏ RDS/STEREO Multiplexer Setting

– MODE : STEREO

– Audio Frequency : 1KHz

❏ FM Signal Generator Setting

– Deviation : 75KHz

– Radio Frequency : 98.0MHz

– Output Level : 26dB

❏ RT955 Setting

– FM Frequency : 98.0MHz

– Antenna Selection : A

– FM MODE : STEREO

– IF MODE : WIDE

qTurn FM Signal Generator Modulation 'ON' (confirm if output level is 26dB)

wmeasure volt while connecting DVM (-) terminal to GND (or Chassis) & connecting

(+) terminal to Jumper J615(S-METER).

eAdjust volt to 1.2V with VR201 (FM-ADJ1).

rAdjust VR206(FM-ADJ2) up to the moment where 'STEREO' & 'TUNED' indicator

turns OFF & ON again.

tConfirm if 'STEREO' & 'TUNED' turn OFF when decreasing the output level

slowly from 26dB to 25dB, 24dB~~~.

(Repeat the above e~rif not OFF in lower than 24dB.)

ySet RT955's Search by MODE to AUTO at Signal Generator Output Level 26dB and

start Auto search Tuning Encoder.

Confirm if search stops at FM Frequency 98.0MHz.

(Examine both of High Freq. ➝98.0MHz search, Low Freq. ➝98.0MHz search)

Oscilloscope

Monitor Audio

Signal

Analyzer

L-CH

(or R-CH)

Jack 2 Ant-B

(ANT 201)

Ant-A

(ANT 200)

Signal

Generator

Stereo

Multiplexer

VR 206

(FM-ADJ 2)

VR 201

(FM-ADJ 1)

S-METER

CP 201

J 615

DVM

(+) (-)

GND

(or Chassis)

IC 203

IC 202

BACK

FRONT

(D) RDS Level adjust

❏ RDS/STEREO Multiplexer Setting

– MODE : STEREO

– Audio Frequency : 1KHz

– RDS MODE : ON

❏ FM Signal Generator Setting

– Deviation : 75KHz

– Radio Frequency : 98.0MHz

– Output Level : 35dB

❏ RT955 Setting

– FM Frequency : 98.0MHz

– Antenna Selection : A

– FM MODE : STEREO

– IF MODE : WIDE

qMake sure that RDS/STEREO Multiplexer RDS Modulation is ON and

turn FM Signal Generator Modulation ON

wConnect oscilloscope terminal to low measuring point of C406(RDS ADJ)

and measure. Make sure that the following waveform is output.

eAdjust waveform to maximum level with VR401(RDS ADJ).

rConfirm if 'RDS' indicator is ON.

Oscilloscope

Monitor Audio

Signal

Analyzer

L-CH

(or R-CH)

Jack 2 Ant-B

(ANT 201)

Ant-A

(ANT 200)

Signal

Generator

RDS/Stereo

Multiplexer

VR 401

(RDS-ADJ)

C (406)

(RSD-ADJ)

(+)

(-)

GND

(or Chassis)

IC 401

BACK

FRONT

Turn VR 401 completely Clockwise

r Counterclockwise to Disable

he RDS Function.

■ AM

* Necessary measurement equipment

AM Signal Generator 1 unit

Audio Signal Analyzer 1 unit

DUMMY 1 unit

Oscilloscope 1 unit

Digital Volt Meter (DVM) 1 unit

(A) VT adjust

❏ AM Signal Generator Setting

qAdjust AM Frequency of RT-955 to 522KHz.

wConnect (-) terminal of DVM with GND (or chassis) and connect (+) terminal

with Jumper J288 (VT CHECK ) and measure voltage. (Low Freq. VT)

eAdjust VT to 1.1V with TL301 (AM-OSC Coil).

rAdjust AM Frequency of RT-955 to 1611KHz.

tMeasure VT and adjust VT to 7.5V with TC301 (WHITE Trimmer).

(High Freq. VT)

yRepeat above w~tsteps 2 or 3 times until VT becomes 1.1V at AM Freq. 522KHz,

and VT becomes 7.5V at 1611KHz.

*In case of USA version, AM freq. Range is 520KHz ~ 1710KHz, adjust as below.

at 520KHz, VT = 1.1V (Low Freq. VT)

at 1710KHZ VT = 8.5V(High Freq. VT)

Jack 2 Ant-B

(ANT 201)

Ant-A

(ANT 200)

Signal

Generator

DUMMY

TL 301

(AM-OSC)

DVM

(+)

(-)

GND

(or Chassis)

BACK

FRONT

TC 301

(White)

FFE 200

FFE

J 288

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