Pioneer m 80 service manual

Page 1

Sefiicc

CIRCUIT DESCRIPTIONS
' REPAIR & ADJUSTMENTS

STEREO POWER AMPLIFIER

(U) PIONEER

ORDER NO.
ARP1 185-A

M-SOCBKJ

MODEL M-90 (BK) COMES IN FIVE VERSIONS DISTINGUISHED AS FOLLOWS:

Typo Power requirement Export destination
KU AC120V only USA.

HE ACZZOV, 240V (swixchable) ' European continent

HEZ ACZ20V 240V (switchable! " West Germany

HB AC220V, 240V (switchable) " United Kingdom

S/G ACIIOV, 120V, 220V, 240V (switchabie) U,SI Military

0 This service manual is applicable to the HEZ type.

Change the primary wiring of the power transformer.

0 As to the HE, HB, KU and 8/6 types, please refer to the additional service manual (ARP1206).

CONTENTS

SPECIFICATIONS ...................
PANEL FACILITIES
PARTS LOCATIONS
EXPLODED VIEWS AND PARTS LIST ......
P.C. BOARDS CONNECTION DIAGRAM

SCHEMATIC DIAGRAM ................
ELECTRICAL PARTS LIST ..............

FPPPWN?

11
15
20

10.
III
12.

BLOCK DIAGRAM ................... 25
CIRCUIT DESCRIPTION ............... 27
IC DESCRIPTIONS ................... 28
PACKING .......................... 29
SAFETY INFORMATION ............... 29

PIONEER ELECTRONIC CORPORATION 4-1 Magma 1-Chome, MegurO-ku. Tokyo 453. Japan
PIONEER ELECTRONICS SERVICE INC. P O. Box 1760, Long Beamx Cairornxa 90501 L; SA

TEL [213} 420-5700
PIONEER ELECTRONIC [EUHDPE) N.v. Keet.bevgaan I, 2740 Have-mam. BeIgum rEL, 03/775 2808

PIONEER ELECTRONICS AUSTRALIA PTY. LTD.

1 787184 BGLIHJary Head, BraesIde, VICEDYIB B195, Auscraha

TEL [DB] SEDEBBII

YG ©IUNE1986 Printed in Japan

Page 2

M- 90 (BK)

1. SPECIFICATIONS

Amplifier Section

Continuous average power output is
200 watts*per channel,min., at 80th
from 20 Hertz to 20,000 Hertz with no
more than 0.003% total harmonic dis-
tortion.

DIN power (both channels driven)

1kHz,O.7%,8§2 ......... ..250W+250W
Dynamic power IEIA test signal)

8 $2 ................................................. 300 W + 300 W

4 $2 .. .. 550W + 550W

2 $2 .. .. 800W + 800 W
Harmonic distortion

20 Hz - 20 kHz, 200W,8S2 ............................ 0.003%
Cross modulation distortion (50 Hz: 7 kHz : 4:1)

During effective output .................................. 0.002%

Input terminals (sensitivity/input impedance)
CONTROL AMP IN, CD DIRECT IN, LINE DIRECT IN .......
1 V/50 RS2
Frequency response
CONTROL AMP IN, CD DIRECT IN, LINE DIRECT IN,
20Hz-20kHz ................................. +OdB/ -0.1dB
SN ratio (short circuit, A network)
CONTROL AMP IN, CD DIRECT IN, LINE DIRECT IN .......
125 dB

Power section, etc.
Power requirements
European model .......................... AC 220 VN, 50/60 Hz
U.K., Australian models ., AC 240 V), 50/60 Hz
U.S. , Canadian models. AC 120 V, 60 Hz
Other destination models . NAC 110 V/120 V/
mV/240 V (switchable), 50/60 Hz

Power consumption
European, U.K., Australian models ..
U.S., Model ................... ,
Other destination models . .. 430 W
External dimensions ...... 457 (W) x 430 ID) x 154 (H) mm.
18IW)x16-7/8IDIX 6-1/16 (H) in
Weight ......................................... 22.6 kg I49 lb 13 oz)

...1,300W

Accessories

Operating Instructions .
Pin-plug cord ............

NOTE:

- Specifications and des/gn subject [0 possible modificarron
without notice due to improvements.

. Measured pursuant to the Federal Trade Comm/ssrons Trade
Regular/an rule on Power Claims for Amplifier.

Precautions for installation

To ensure optimum sound quality, observe the following

precautions,

~ This unit is heavy. Be sure to install it on a firm base which
can support its weight. Also, to prevent the flow of cooling
air from being blocked off, do not place the unit on soft
material such as a carpet or cushion, or install it in a
confined space. When installing the unit in a rack, provide
adequate space around it to allow heat to dissipate.

- To prevent the control amplifier from picking up noise due
to leakage flux from the power amplifier when the control
amplifier and power amplifier are installed adjacent to each
other, install the control amplifier on the right of the power
amplifier. Also, if you install the control amplifier above or
below the power amplifier, place a partition between them
to separate them by at least 10 cm from each other.

0 Install the unit on a level surface so that the feet of the unit
are all touching the installation surface.