Kenwood KA 7050 R Service Manual

Page 1

WEBOR KENWOD

SERVICE MANUAL

© 1992-10 PRINTED IN JAPAN
BS1 4553410 (8) 2606

Metalllc cabmel Knob Panel assy Knob
(A01 2952-01} (K294415434) (ASOJJZSQOZ) (K294414704)

H, Hm lff'rwu

Phones lack FOO! Knob Knob Knob
(Enroeows) 0024072415) (K294412704) X3 (K291341204) x2 (K296405704)
Phone Jack Phone lack adaptm Power cord bushmg Slide swilch Sllde sthch
(Elia-063605) (Em-0536705) X2 (HZ-008305) (5312131705) (331 232205)

Phonojack Screw termlnal board speakers' Miniature phone lack AC outlet' AC power cord'
, (Em-0253705) (E20-0839-15)2EP,Y,M x T (EH-OBS-OS) (503-) (230')
i (E7070029-05), L

Relev (0 parts list on page 29,

PRECAUTIONS FOR REPAIR

Handle the power MOS-FETs carefully. They are easily destroyed by static electricity.

Page 2

KA-7050R
CONTENTS

NOTES .................................................................... 2 PC BOARD ......................

CIRCUIT DESCRIPTION ....3 SCHEMATIC DIAGRAM

ADJUSTMENT ...... ...9 EXPLODED VIEW....

REGLAGE .......... PARTS LIST .............

ABGLEICH ................... REMOTE CONTROL OPERATION ,,,,,,,

WIRING DIAGRAM ...... SPECIFICATIONS .............................. BACK COVER

INSTRUCTION MANUAL

860-0882-00 ENGLISH E, P, Y, M, x, T,L
Boo-oesa-oo FRENCH E, F', L
360-0884-00 SPANISH E, M, L
EGO-0885700 CHINESE M

NOTES

Handle the power MOS-FETs carefully. They are
easily destroyed by static electricity.

When soldering, use a high-insulation
soldering iron.

When soldering, solder the gate (G) first.

When replacing the power MOS-FET, there are
differences according to the ranks, so please
replace Pch (or Nch) as a pair of identical rank.
The parts stock for parts of the same rank as Pch
(or Nch) come in packs of pairs.

When ordering a quantity of 1, one pack
(containing 2) will be delivered in one bag.

Please order as (23K1530-LBP2, 2SJ201-LBP2).
LBP2 means one pack containing one pair.

There is no need to adjust the ranks of Pch and
Nch, and there is no need to adjust the ranks of the
left channel and right channel either.

Since the KA-7050R is a FET amp, even with no
signal, nearly as much heat is generated as for
maximum output.

When piling sets on top of each other, put this amp
at the top. Placing any other unit on top of this amp
interferes with the heat release and can cause
harm, so do not do this,