Advent 300 rec sm

This is the 17 pages manual for Advent 300 rec sm.
Read or download the pdf for free. If you want to contribute, please mail your pdfs to info@audioservicemanuals.com.

Page: 1 / 17
left right
Advent 300 rec sm

Extracted text from Advent 300 rec sm (Ocr-read)


Page 1

I
A DV E\ I Service Manual for Model 300
Beginning with Serial Numbers JO 07000 and Y0 01000

Table of Contents

I. GENERAL INFORMATION IV. POWER SUPPLY 120 VAC/12 VDC
l 1 Specifications , . 3 4.1 300/I2 VDC Board View . . . . . 10
1.2 Required Test Equipment . 2 42 300/12 VDC Schematic Diagram. . . 10
4.3 120 VAC and Amplifier
Schematic Diagram . . . . 1
II' AMPLIFIER SECTION 4.4 Tuner Schematic Diagram . . . . . ll
2.] Preparation . . . . . . 3
2.2 Power Supply and output Bias . . . . 3 V. PARTS LIST
2.3 Amplifier Test . . . . . . . . 3-4
2.4 Phono Pre-Amp . . . . . . . . 4-5 51 AmplifierPC Board . . . . . . 13
2.5 Amplifier Board View . , . . . , . 5 5-2 Heat Sink Mounting Hardware . . l3 l4
5-3 Power Supply 110 VAC . . . . . 14
54 Tuner Board . . . . . . 14-15
I . SECTION
II TUNER 5-5 Power Supply 12 VDC. . . . . . 15
3.1 Preparation. _ 6 5-6 Cosmetic Parts . . . . . . . . l5
3.2 Detector Alignment . . . . . . b
3.3 IF Alignment . , . . . . . 6-7
3.4 Local Oscillator ( alihratinn 7
35 RF Alignment 7
3.6 Stereo Alignment 7
3.7 Tuner Board View 8
3.8 Multiplex Filler Adjustment 9
3.9 Transistor Basing Diagrams 9

Page 2

GENERAL INFORMATION

1.1 SPECIFICATIONS

Amplifier section

Continuous power output, both channels driven, 8 ohms
40 Hz to 20 kHz: 15 watts + 15 watts
1 kHz: 18 watts + 18 watts

Total harmonic distortion, 40 Hz to 20 kHz
15 watts.per channel: less than 0.5%
7.5 watts per channel: less titan 0.1%

Intermodulation distortion
60/7000 Hz; 4: I: less than 0.15%

Preamp section
Maximum output: greater than 6V

Hum and noise, shorted input, A-weighted
Phone ref 10 mV @ 1 kHz: better than 80 dB
Aux, Tape monitor: better than 80 dB

Total Harmonic distortion
20 Hz to 20 kHz: less than 0.1% (2.5V)

lntermodulation distortion
60/7000 Hz; 4: 1: less than 0.1%(2.5V)

Tone controls

Bass: ilOdB @100 Hz
Treble: £10 dB @ 10,000 Hz

Infrasonic filter
Phone: 0 dB @ 25 Hz
-1 dB @ 20 Hz
-31 dB @ 4 Hz

FM tuner section

Mono sensitivity
ll-lF 30 dB: 2.5 uV'
IHF 50 dB: 3.5 uV

Stereo sensitivity
IHF 50 dB: 35 uV

Total harmonic distortion, 400 Hz, IHF
Mono: less than 0.15%
Stereo: less than 0.2%

Stereo separation, IHF
400 Hz: greater than 40 dB
30 Hz to 10 kHz: 28 dB

Alternate channel selectivity: 70 dB

Image rejection: 55 dB

IF rejection: 70 dB

Spurious rejection: 70 dB

AM suppression: 60 dB

Capture ratio: 1.6 dB

Antenna input: 300 ohms balanced

Power requirements
Model 300: 120 VAC, 60 Hz,

100 watts maximum

Model 300/12: 12 VDC, negative
ground, 7 amps maximum

1.2

REQUIRED TEST EQUIPMENT

The following list of test equipment is required to properly service the Model 300 stereo receiver.

1. Audio Oscillator, Hewlett Packard 204C or equivalent.
. Precision ACVM, Hewlett Packard 400 UL or equivalent.
. Oscilloscope, Tektronix T922 or equivalent.

aura-WM

Sound Technology Model 1000A or equivalent.

\l

8. AC line variac. General Radio W5MT3A or equivalent.

. Volt, Ohm Meter, Hewlett Packard Model 427A or equivalent.
. Distorligrmflyaehllcwlett Packard Model 333A or equivalent.
. FM Multiplex Generator, less than 0.2 THD and better titan -60 dB signal to noise.

. Two (2), Eight ohm load resistors, 1%, 25 watt minimum rating.

9. Frequency counter, 100 MHz, Data Precision Model 5740 or equivalent.