Sony STR-NX300 Service Manual
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Sony STR-NX300 Service Manual

Sony STR-NX300 Service Manual

Sony str-nx300 tuner/amplifier service manual
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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 de-
scribed in this service manual.
Please refer to STR-NX1/NX3 service manual (9-928-980-S) previously issued for other
information.
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:
(phono jacks)
MD IN:
(phono jacks)
DVD INPUT:
FRONT IN:
(phono jacks)
REAR IN:
(phono jacks)
CENTER IN:
(phono jacks)
WOOFER IN:
(phono jacks)
MIC1/2:
(mini jack)
Outputs
MD OUT:
(phono jacks)
VIDEO OUT:
(phono jack)
S-VIDEO OUT:
(4-pin/mini-DIN jack)
MICROFILM
STR-NX300
SPECIFICATIONS
PHONES:
(stereo mini jack)
FRONT SPEAKER:
REAR SPEAKER:
(6 ohms at 1 kHz, DIN)
CENTER SPEAKER:
120 + 120 watts
SUPER WOOFER:
(6 ohms at 1 kHz,
10% THD)
Tuner section
FM stereo, FM/AM superheterodyne tuner
(8 ohms at 1 kHz, DIN)
FM tuner section
35 watts
(8 ohms at 1 kHz,
Tuning range
10% THD)
Aerial
Aerial terminals
Intermediate frequency
(8 ohms at 1 kHz, DIN)
AM tuner section
35 + 35 watts
(8 ohms at 1 kHz,
Tuning range
10% THD)
2 Band type:
voltage 250 mV,
impedance 47 kilohms
voltage 450 mV,
impedance 47 kilohms
3 Band type:
voltage 450 mV,
MW:
impedance 47 kilohms
voltage 450 mV,
impedance 47 kilohms
voltage 450 mV,
impedance 47 kilohms
voltage 450 mV,
SW:
impedance 47 kilohms
sensitivity 1 mV,
impedance 10 kilohms
Aerial
Aerial terminals
Intermediate frequency
voltage 250 mV
impedance 1 kilohms
max. output level 1 Vp-p,
unbalanced,
Sync negative,
load impedance 75 ohms
Y: 1 Vp-p, unbalanced,
Sync negative,
C: 0.286 Vp-p,
load impedance 75 ohms
E Model
Chinese Model
accepts headphones of 8
ohms or more
accepts impedance of 6 to
16 ohms
accepts impedance of 8 to
16 ohms
accepts impedance of 8 to
16 ohms
Voltage 1 V, impedance
1 kilohms
87.5 – 108.0 MHz
FM lead aerial
75 ohm unbalanced
10.7 MHz
531 – 1,602 kHz
(with the interval set at
9 kHz)
530 – 1,710 kHz
(with the interval set at
10 kHz)
531 – 1,602 kHz
(with the interval set at
9 kHz)
530 – 1,710 kHz
(with the interval set at
10 kHz)
5.95 – 17.90 MHz
(with the interval set at
5 kHz)
AM loop aerial
External aerial terminal
450 kHz
– Continued on next page –
TUNER/AMPLIFIER

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Summary of Contents for Sony STR-NX300

  • Page 1 SERVICE MANUAL E Model Chinese Model • 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 de- scribed in this service manual.

  • Page 2: Servicing Notes

    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 PUB- LISHED BY SONY.

  • Page 3: Location Of Controls

    GENERAL • LOCATION OF CONTROLS (Page 4) – Front Panel – 7 9 qa qd qg 1 DISPLAY button qs qf 2 ?/1 button and indicator 3 POWER SAVE/DEMO (STANDBY) button 4 – m button 5 + M button 6 FILE SELECT button 7 VIDEO/DVD button 8 EDIT button 9 MD button...
  • Page 4 (Page 5) Step 3: Setting the Press CLOCK/TIMER. The hour indication flashes. time You must set the time before using the timer functions. Press V or v repeatedly to set the hour. Press ENTER. The minute indication flashes. Press V or v repeatedly to set the minute.

  • Page 5: Ic Pin Function Description

    S615 to S617, S619 to S624 (TUNER BAND, STEREO/MONO, TUNER MEMORY, KEY1 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) (STR-NX300) MAIN BOARD IC501 M30622MA-A29FP (SYSTEM CONTROLLER ) Pin No. Pin Name...

  • Page 6: Printed Wiring Board - Main Board

    STR-NX300 3-2. PRINTED WIRING BOARD – MAIN Board – : Difference portion. Page STR-NX1/NX3 STR-NX300 Location C – D, 6 – 8 (MY, SP, HK, CH) Location D – G, 2 – 5 (TH, CH) (CH) (CH) (CH) CN191 (CH)
  • Page 7 STR-NX300 3-3. SCHEMATIC DIAGRAM – MAIN Board (2/3) – (Page 13) : Difference portion. • Abbreviation : Chinese model : Singapore model : Hong Kong model : Thai model : Malaysia model...
  • Page 8 STR-NX300 3-4. SCHEMATIC DIAGRAM – PA Board – 3-5. PRINTED WIRING BOARD – PANEL Board – : Difference portion. : Difference portion. Page STR-NX1/NX3 STR-NX300 Page STR-NX1/NX3 STR-NX300 Location A – D, 9 – 12 Location D – E, 1...
  • Page 9 STR-NX300 3-6. SCHEMATIC DIAGRAM – PANEL Board – (Page 21) : Difference portion. IC702 M65850FP OSCILLATOR LPF2 1/2 VCC CLOCK AUTO MAIN 20KBIT RESET RESET CONTROL SRAM LPF1...
  • Page 10 STR-NX300 3-7. PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM – TRANS Board – EXPLODED VIEWS : Difference portion. • Abbreviation • Items marked “*” are not stocked since they The components identified by CH : Chinese model are seldom required for routine service. Some...
  • Page 11 Page STR-NX1/NX3 STR-NX300 supplied supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-4426-281-A PA BOARD, COMPLETE (NX3: E, AUS) A-4428-730-A PA BOARD, COMPLETE 0 104 1-575-651-11 CORD, POWER (NX: MY, SP) 0 104 1-777-071-51 CORD, POWER (HK, MY, SP)

  • Page 12: Electrical Parts List

    : Singapore model TH : Thai model When indicating parts by reference number, please include the board. Page STR-NX1/NX3 STR-NX300 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-4426-277-A MAIN BOARD, COMPLETE (NX3: MY, SP)
  • Page 13 Page STR-NX1/NX3 STR-NX300 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-4426-275-A PANEL BOARD, COMPLETE (NX3: E, AUS) A-4426-655-A PANEL BOARD, COMPLETE ********************** ********************** C704 1-162-306-11 CERAMIC 0.01uF C705 1-126-961-11 ELECT 2.2uF C714 1-162-282-31 CERAMIC 100PF...
  • Page 14 STR-NX300 Page STR-NX1/NX3 STR-NX300 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark MISCELLANEOUS MISCELLANEOUS ************** ************** 1-733-011-11 WIRE (FLAT TYPE) (15CORE) 1-751-688-11 WIRE (FLAT TYPE) (13CORE) (TH) (AEP, UK, MY, SP, JE) 1-733-011-11 WIRE (FLAT TYPE) (15CORE)

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