Pioneer a 90 service manual

Page 1

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CIRCUIT DESCRIPTIONS

REPAIR & ADJUSTMENTS ORDER NO.
ARP- 344-0
STEREO AMPLIFIER
O This service manual is applicable to the KU type.
1. SPECIFICATIONS .................... 2 a. SCHEMATIC DIAGRAM ............... 27
2. FRONT PANEL FACILITIES ............ a 9. ELECTRICAL PARTS LIST ............. 33
3. BLOCK DIAGRAM ................... 5 10. ADJUSTMENTS ..................... 40
4. CIRCUIT DESCRIPTIONS ------------- 7 11. SAFETY INFORMATION 41
5- PARTS LOCATION ------------------- 10 12. PACKING . . . . . . . . .................. 42
e. EXPLODED VIEWS
AND PARTS LIST .................. 13
7. RC. BOARDS CONNECTION
DIAGRAM ....................... 19

RECEIVED SEP ' 7 m

PIONEER ELECTRONIC CORPORATION 4-1.Megum 1-Chame, Meguloiku, Tokyo 153. Japan
alaNEEn ELEGmoulcq [USA] INC. 1925 E DDrrIII'IguEz 51;, Luv-lg Beach, Callfornua 90810 USA

PIONEER ELECTHDN": [EURDDE] N.V. Keetberglaan 1. 27413 Beveren. BeIQIDm

FIDNEER ELECTRONIC. AuaTnALIA PTV. LTD. 479-184 awndawy Fined. BPaesIfle. vIcwI-Ia 3195. Austrana

Yx © APR. 1983 Printed in lawn

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1. SPECIFICATIONS

Amplifier Section

Continuous Average Power Output is 200 watts
per channel, min., at 8 ohms from 20 Hertz to
20,000 Hertz with no more than 0.002 %

total harmonic distortion?

Continuous Power Output at 1kHz (both channel driven)

T. H. D. 0.002%, 8 ohms ....... 220watts per channel
Total Harmonic Distortion (20 Hertz to 20,000 Hertz,
8 ohms)

continuous rated power output

...................... " "No more than 0.002%

100 watts per channel power output

..................... No more than 0.002%
lntermodulation Distortion (50 Hertz: 7,000 Hartz=4: 1,
8 ohms)
continuous rated power output
...................... No more than 0.002%
Damping Factor (20 Hertz to 20,000 Hertz, 5 ohms)

................................... 100
Input (Sensitivity/Impedance)

PHONO MM ................ 2.5mV/50 kiiohms

PHONO MC ........... 150uV/100 ohms, 33 ohms

TUNER, CD/AUX1, AUXZ, TAPE PLAY 1, 2
........................ 150 mV/50 kilohms
Phono Overload Level (TJ-LD. 0.008%, 1,000Hz)

PHONO MM ....................... 300mV

PHONO MC ........................ 18mv
Output Level/impedance

TAPE REC 1, 2 ............. ISOmV/2.2 kilohms

Frequency Response
PHONO MM (HIAA Equalization)
................... 20Hz to 100,000H2102d8

TUNER, CD/AUXI, AUX2, TAPE PLAY 1. 2

..................... 5H2 to 100,000Hzigd3
Tone Control
BASS ........... tSdB (IOOHz) at 200Hz POsition
......... Turnover frequency: 100Hz/200Hz/400Hz
TREBLE .......... :GdB (10kHz) at 4kHz Position

Turnover frequency: 2kHz/4kHz/8kHz

Filter
LOW (SUBSONIC) ............. iSHz l-6dB/oct.)
Hum and Noise (IHF, short circuited A network)
PHONO MM ........................ BQdB
PHONO MC ......................... 74dB
TUNER. CD/AUXL AUXZ, TAPE PLAY 1,2 .. 113dB
Muting .............................. -20dB
Miscellaneous
Power Requirements ............... 120V, 50/60Hz
Power Consumption ................. 350 W (U L)
Dimensions .......... 420(W) x 150'(H) x 420(0) mm
16-9/16(Wl x 5-7/BlH) x 16-9/16lD) in
Weight (without package) ......... 19.6kg [43 lb 3 oz)
Furnished Parts
Operating Instructions ....................... 1

'Meuurad pursuant to M0 Fndrrll Trade Commissions Trade
Regulation rule on Power Output Claims for Amplifier.

Manned by Shibuoku 725 Automatic Dirtartr'an Analyzer.

NOTE:
Specifications and vesign subject to possible modification wirhaut
notice.