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This is exactly the service manual I needed.
Complete with all schematics, partslists, PCB layouts and alignment instructions.
This manual covers both the T-4970 en T-488F Onkyo tuner.
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IF PRINTED CIRQUIT BOARD WIRING VIEW WAS ONE TONE LIGHTER, THEN 5 STAR RANK HAS TO BE MY CHOISE.
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Very usefull, good quality drawings !
Muito útil encontrei todas as informações necessárias.
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Wanting to repair a neighbours tape recorder I needed the necessary information, it makes it easier. Although the service manual is described as "Language : English" To my dismay I found that it is entirely written in German, a language I do not understand. At least I now have the schematics which will help of sorts. I may not use this service again due to the laguage difficulty after all when it states English you do not expect it to be entirely in another language.
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GOOD SERVICE MANUAL.I ALWAYS BUY THERE IF I FIND WHAT I AM LOKING
Performance Specifications
FREQUENCY RESPONSE + 0, -0.5dB from 20Hz to 20,000Hz RATED OUTPUT 2.5V at MAIN and SWITCHED 1 and 2, and BALANCED OUTPUTS MAXIMUM VOLTAGE OUTPUT More than 8V at all outputs TOTAL HARMONIC DISTORTION 0.002% maximum IHF, 0.2% maximum from 20Hz to 20,000Hz at rated output SENSITIVITY Phono: 2.2mV for 2.5V rated output, (0.45mV IHF) High Level: 250mV for 2.5V rated output, (50mV IHF) SIGNAL-TO-NOISE RATIO, A-WEIGHTED Phono: 80dB below 10mV input High Level: 90dB below rated output VOLTAGE GAIN Phono To Tape: 41 dB at 1000Hz Phono To Main: 61 dB at 1000Hz High Level To Tape: 0dB High Level To Main: 20dB INPUT IMPEDANCE Phono: 47K ohms and 65pF Capacitance High Level: 22K ohms TONE CONTROLS Bass and Treble stepped, 20dB boost to 20dB cut AC POWER OUTLETS 4 switched and 1 unswitched, Total capacity 1400 watts POWER REQUIREMENTS 120V, 50/60Hz, 37 watts DIMENSIONS Front Panel: 16 inches (40.6cm) wide by 5-7/16 inches (13.8cm) high. Chassis depth behind mounting panel, including clearance for connectors: 14 inches (35.6cm). Knob clearance required in front of mounting panel: 1-1/2 inches (3.8cm). FINISH Anodized gold and black front panel, chassis is black. WEIGHT 16 pounds (7.3Kg) net, 25 pounds (11.4Kg) in shipping carton
Notes
1. The four types of heavy lines on the schematics denote the primary signal path in the following manner: = LEFT CHANNEL = RIGHT CHANNEL = LEFT BALANCED = RIGHT BALANCED 2. Unless otherwise noted, all voltages indicated on the schematics are measured under the following conditions: a. AC input at 120 volts, 50/60Hz. b. All voltages are ±10% with respect to ground. A high impedance (10 megohm) voltmeter must be used. 3. Unless otherwise specified: a. Resistor values are in ohms. b. Capacitor values are in microfarads (uF). 4. The voltages enclosed in a box are signal voltages that are measured with a 2.2mV, 1kHz signal connected to both channels at the PHONO 1 INPUT JACKS.
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FRONT PANEL CONTROLS are set at: BALANCE CENTER DETENT BASS and TREBLE CENTER DETENT INPUT SELECTOR PHONO 1 LOUDNESS NORMAL MODE STEREO POWER ON VOLUME CLOCKWISE TAPE MONITOR 1 and 2 NORMAL RUMBLE and HF FILTERS FLAT SPEAKERS 1&2 5. On PC Board Drawings, Square Pad Indicates: a. Polarized Capacitors - Positive b. Diode - Cathode c. Others - Pin 1 6. WARNING: Parts marked with the symbol have critical characteristics. Use ONLY replacement parts recommended by the manufacturer.
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