Sony STRNX-300 Service manual

STR-NX300

SERVICE MANUAL

• STR-NX300 is the Tuner and Amplifier section in MHC-NX300AV.

• STR-NX300 is almost the same as STR-NX3 Singapore model. The difference portion and the difference parts from STR-NX3 Singapore model are described in this service manual. Please refer to STR-NX1/NX3 service manual (9-928-980-S) previously issued for other information.

SPECIFICATIONS

Amplifier section

The following measured at AC 120/220/240 V, 50/60 Hz

Front Speaker:

DIN power output (rated) 95 + 95 watts

Continuous RMS power output (reference)

Centre Speaker:

DIN power output (rated) 25 watts

Continuous RMS power output (reference)

Rear Speaker:

DIN power output (rated) 25 + 25 watts

Continuous RMS power output (reference)

Inputs VIDEO IN: voltage 250 mV, (phono jacks) impedance 47 kilohms MD IN: voltage 450 mV, (phono jacks) impedance 47 kilohms DVD INPUT:

FRONT IN: voltage 450 mV, (phono jacks) impedance 47 kilohms REAR IN: voltage 450 mV, (phono jacks) impedance 47 kilohms CENTER IN: voltage 450 mV, (phono jacks) impedance 47 kilohms WOOFER IN: voltage 450 mV,

(phono jacks) impedance 47 kilohms MIC1/2: sensitivity 1 mV, (mini jack) impedance 10 kilohms

Outputs MD OUT: voltage 250 mV (phono jacks) impedance 1 kilohms VIDEO OUT: max. output level 1 Vp-p, (phono jack) unbalanced,

S-VIDEO OUT: Y: 1 Vp-p, unbalanced, (4-pin/mini-DIN jack) Sync negative,

(6 ohms at 1 kHz, DIN)

120 + 120 watts (6 ohms at 1 kHz, 10% THD)

(8 ohms at 1 kHz, DIN)

35 watts (8 ohms at 1 kHz, 10% THD)

(8 ohms at 1 kHz, DIN)

35 + 35 watts (8 ohms at 1 kHz, 10% THD)

Sync negative, load impedance 75 ohms

C: 0.286 Vp-p, load impedance 75 ohms

Chinese Model

PHONES: accepts headphones of 8 (stereo mini jack) ohms or more FRONT SPEAKER: accepts impedance of 6 to

REAR SPEAKER: accepts impedance of 8 to

CENTER SPEAKER: accepts impedance of 8 to

SUPER WOOFER: Voltage 1 V, impedance

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz Aerial FM lead aerial Aerial terminals 75 ohm unbalanced Intermediate frequency 10.7 MHz

AM tuner section

Tuning range 2 Band type: 531 – 1,602 kHz

3 Band type: MW: 531 – 1,602 kHz

SW: 5.95 – 17.90 MHz

Aerial AM loop aerial Aerial terminals External aerial terminal Intermediate frequency 450 kHz

16 ohms

1 kilohms

(with the interval set at 9 kHz) 530 – 1,710 kHz (with the interval set at 10 kHz)

(with the interval set at 5 kHz)

– Continued on next page –

TUNER/AMPLIFIER

E Model

MICROFILM

General

Power requirements Thai and Chinese models: 220 V AC, 50/60 Hz Other models:

Power consumption 300 watts

Dimensions (w/h/d)

Mass

Design and specifications are subject to change without notice.

120 V, 220 V or 230 – 240 V Adjustable with voltage selector

Approx. 225 x 202 x 356 mm

Approx. 8.1

AC, 50/60 Hz

1. SERVICING NOTES

• MODEL IDENTIFICATION (Page 3)

– Rear Panel –

PART No.

MODEL PART No.

Malaysia, Singapore and Hong Kong models 4-221-391-5[] Thai and Chinese models 4-221-391-7[]

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

2. GENERAL

• LOCATION OF CONTROLS (Page 4)

– Front Panel –

3 4 5

– Rear Panel –

–

qa qd

wl e; ea

qf qh

–

1 DISPLAY button 2 ?/1 button and indicator 3 POWER SAVE/DEMO (STANDBY) button

qj qk

4 – m button 5 + M button 6 FILE SELECT button 7 VIDEO/DVD button 8 EDIT button 9 MD button

w; wa

0 REPEAT button qa TAPE button qs PLAY MODE button qd CD button qf DBFB button qg TUNER button

qh DSP button qj TUNER BAND button qk STEREO/MONO button ql TUNER MEMORY button w; KARAOKE PON button wa GROOVE button and indicator ws ECHO LEVEL knob wd MIC LEVEL knob wf MIC 1 jack wg MIC 2 jack wh PHONES jack wj Remote sensor wk Jog dial wl ENTER button and indicator e; DVD 5.1CH button and indicator ea PRO LOGIC button and indicator es VOLUME knob

4 5

212

1 AM ANTENNA terminals 2 FM ANTENNA terminal 3 SYSTEM CONTROL connector 4 VIDEO (AUDIO) IN jacks 5 MD IN jacks 6 MD OUT jacks 7 DVD 5.1CH INPUT jacks 8 SUPER WOOFER OUT jack 9 VOLTAGE SELECTOR switch

(Malaysia, Singapore and Hong Kong models)

q; FRONT SPEAKER terminals qa REAR SPEAKER terminals qs CENTER SPEAKER terminals

(Page 5)

Step 3: Setting the time

You must set the time before using the timer functions.

Press CLOCK/TIMER.

The hour indication flashes.

Press V or v repeatedly to set the hour.

Press ENTER.

The minute indication flashes.

Press V or v repeatedly to set the minute.

2,4

3,5

Press ENTER.

The clock starts working.

Tips

• If you make a mistake, start over from step 1.

• Setting the time deactivates the demo mode. If you want to display the demo mode, press DEMO (STANDBY) when the power is off.

To change the time

The previous explanation shows how to set the time while the power is off. To change the time while the power is on, do the following:

1 Press CLOCK/TIMER. 2 Press V or v repeatedly to select the SET

CLOCK.

3 Press ENTER. 4 Perform steps 2 through 5 above.

Note

The clock settings are cancelled when you disconnect the mains lead or if a power failure occurs.

3. DIAGRAMS

3-1. IC PIN FUNCTION DESCRIPTION (Page 24, 25)

(STR-NX1/NX3)

• MAIN BOARD IC501 M30622MA-A12FP (SYSTEM CONTROLLER )

Pin No. Pin Name I/O

Key input terminal (A/D input)

93 KEY1 I

(STR-NX300)

• MAIN BOARD IC501 M30622MA-A29FP (SYSTEM CONTROLLER )

Pin No. Pin Name I/O

93 KEY1 I

S615 to S617, S619 to S624 (TUNER BAND, STEREO/MONO, TUNER MEMORY, GROOVE, + M, – m, ENTER, DVD 5.1CH, PRO LOGIC) keys input (S623 DVD 5.1CH, S624 PRO LOGIC keys: used for the STR-NX3 only)

Key input terminal (A/D input) S615 to S624 (TUNER BAND, STEREO/MONO, TUNER MEMORY, KARAOKE PON, GROOVE, + M, – m, ENTER, DVD 5.1CH, PRO LOGIC) keys input

Description

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