Akai AA 1020 1020 L Service Manual

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Akai AA 1020 1020 L Service Manual

Extracted text from Akai AA 1020 1020 L Service Manual (Ocr-read)


Page 1

SECTION 1

SERVICE MANUAL

TAB LE OF CONTENTS

I. SPECIFICATIONS .................................................................. 2
II. DISMANTLING 0F UNIT ............................................................ 4
III. ARRANGEMENT 0F PRINCIPAL PARTS ............................................... 5
IV. FM TUNER SECTION ADJUSTMENTS ................................................. 6
V. AM TUNER SECTION ADJUSTMENT (Model AA-1020) ................................... 10
VI. AM (LW AND MW) TUNER SECTION ADJUSTMENT (Model AA-1020L) ..................... ll
1. LW SECTION ADJUSTMENT ....................................................... II
2. MW SECTION ADJUSTMENT ....................................................... 11
VIII MAIN AMPLIFIER ADJUSTMENT ..................................................... 12
VIII. TUNfl‘IG CORD THREADING ......................................................... 13
IX. CLASSIFICATION OF VARIOUS P.C BOARDS .......................................... I4
1‘ PC BOARD INTERCHANGEABILITY CHART ........................................ l4
2‘ COMPOSITION OF VARIOUS P.C BOARDS ........................................... 15

F01 basic adjustments, measun‘ng methods, and operating principles, refer to GENERAL OPERAT-
ING PRINCIPLES AND ADJUSTMENTS.

Page 2

I. SPECIFICATIONS

An asterisk next to a figure indicates the minimum guaranteed performance.

1. AMPLIFIER SECTION (Models AA—lO20 and AA-IOZOL)

RATED OUTPUT

20 watts per channel (both channels driven). Minimum RMS, at 8 ohms load
impedance from 20 to 20,000 Hz, with on more than 0.4% total harmonic
distortion.

POWER BAND WIDTH (IHF)

10 to 60 kHz at 8 ohms, distortion within 0.4%.

INPUT SENSITIVITY PHONO-l, 2 3 mV/50 k Ohms (~48 :15 dBm) with Output 24.3 dBm, 8 ohms as standard.
TAPE-l, 2 150 mV/80 k ohms (—14 :1.5 dBm) with output 243 dBm, 8 ohms as standard.
AUX 150 mV/80 k ohms (714 21.5 dBm) with output 243 dBm, 8 ohms as standard.
ESIDUAL NOISE Less than 1.4 mV (Less than A55 dBm)
SIGNAL TO NOISE RATIO PHONO-l, 2 Better than 80 dB (Less than 740 dBm, input shorted)
(IHF) TAPE-1. 2 Better than 90 dB (Less than -50 dBm, input open)
AUX 1 Better than 90 dB (Less than 750 dBm, input shunted at 5 k Ohms)
TONE CONTROL BASS 1 10 :1.5 dB, —10 :15 dB at 100 HZ
TREBLE 1 10 :1.5 dB, —10 :1.5 dB at 10 kHz
SSWNTROL 1 10 :1.57dBflart 100 Hi 7 '
- 7 "fl, ‘ 6:1,5dBat10kHz 7 7 7 7
FILTER LOW CUT —6 dB at 50 Hz *—8 11.5 dB at 50 Hz
,,,,, HIGH CUT —9 dB at 10 kHz *—9:1.5 dB at 10 kHz
FREQUENCY RESPONSE (PHONO) RIAA :1 dB 7 ' ' " 7’ V V '

EI-IANNEL SEARATION (II-171577
CTROSS @161??qung 7 '7
L-R gEyIATIONtPPIONO)

RECORDING'OUTPUfiPHONO) PIN
DIN

*13.11:1.0 dB at 100 HZ
*713.75 11.0 dB at 10 kHz

Better than 55 dB at 1,000 HZ
*Better than 50 dB at I‘OOQUZW:
Better than7507dB , ,

Within 341; V , 7'" ' ' T" 7' 7
150TI1V(714.3 :2 dBm)
26 mV (428.2 :2 dBm)

2. FM TUNER SECTION (Models AA—1020 and AA-IOZOL)

F REQUENCY RANGE

88 to 108 MHz
*87.4 to 109 :1 MHz

DIAL TRACKING ERROR :250 kHz
SENSITIVITY (IHF) 1 2.0 “V

*Less than 3.2 IN (10 dB)
SENSITIVITY DEVIATION 1 Within 3 dB

IMAGE REJECTION RATIO

IF REJECTION RATIO

Better than 65 dB at 98 MHZ
*Better than 50 dB (IHF)
Better than 90 dB at 98 MHz
*Better than 80 dB (IHF)

CAPTURE RATIO (IHF) Less than 2 dB

LIMITING SENSITIVITY Less than 8 dB (Audio output 71 dB)
MUTING SENSITIVITY 1 15 to 30 dB

SELECTIVITY (IHF) ‘ Better than 70 dB

7 *Better than 65 dB

AM SUPPRESSION RATIO Better than 45 dB

SIGNAL TO NOISE RATIO

Better than 68 dB
*Better than 50 dB (STEREO) including carrier leak
*Better than 60 dB (MONO)

DISTORTION FACTOR

FREQUENEY RESPONSE "

Less than 0.5% (STEREO)
*Less than 1.0% (STEREO)
Less than 0.3% (MONO)
*Less than 0.5% (MONO)
—13 :I dBTAtWTH’z (US-A)
710.5 :1 dB at 10 kHz (US—B)

STEREO SENSITIVITY 4.5 av (15 :3 dB) 7
EEO SEPAIJTIONWT” Better than 40 dB

L—R DEVIATION ’7 T Within 3 dB

RECORDING OUTPUT " PIN 390 mV (—6 :3 dBm)

DIN

70 mV (—21 :3 dBm)