Kenwood AA 5 Service Manual

Page 1

FM/AM STEREO RECEIVER KENWOOD
A-A5/A5 L

SERVICE MANUAL
(83%?ISEOHIE'NiY§$§¥EM UD-EOO/SOOM)

Knob Mmallic cabine From glass Knob aSSV
«(294427-044 ' (A017) ~ (810-1 92803) IK29-4358-04I

Knob Knob
Phone jack {E1 1-0234-05) (K29-4426-OI) (K29-4427-04!
Miniature phone jack AC d"
(E1 1-0200-05) (Esgjwer cor
Lock terminal board Power cord bushing
(E20») AZ-008305)

< K.P.T,E type>

m m m

Rectangular receptacie Lock terminal! board Fhano jack
(EOE-150805) (E20-0475-05) {E19-01 38-05]

Rectangular receptacle
(E08~0411-05) * Refer to parts list on page 53.
Phom is A-AS.

[A-As : K.P,Y,M,X type

5 1,5 We ] Refer to the SERVICING NOTES on page 2 before repair.

Page 2

NA-A5/A5L

CONTENTSISERVICING NOTES

Luck terminal board
(E20-0476'05)

IxENJ/OOD

Slide switch
(53172132-05)

Rectangular receptacle Rectangular receptacle

(E08~1508-05) (E58-0001705)

Contents
CONTENTS/SERVICING NOTES ...................................
ACCESSORlES...
PACKlNG .........
CONTROLS AND INDICATORS ..
DISASSEMBLY FOR REPAIR ......
BLOCK DIAGRAM .........
CIRCUIT DESCRIPTION,

N

(D-NUl-bb)

Servicing notes

(D This unit does not contain a selector IC. However, as IN-
PUT SELECTOR IC is in corporated into the graphic equaliz-
er (GE-A5), signal system goes through the graphic equalizer.
Since each speaker relay of this unit is operated according
to the data that is serially transmitted from the graphic
equalizer (GE-A5), the receiver cannot output sound alone.
To output a tuner signal to each speaker terminal, follow
the following procedures.

Procedure 1)

Direct the tuner output to the main amplifier input. Connect the
test pin on the right (lower right of the tuner board) of the main
amplifier board (X09, A/6l (Fig. 1 or 2)

Front amplifier

K,P,T,E type [ Pins 8 and 9 (Left channel)
(Fig. l) Pins 6 and 4 (Right channel)

Y,M,X type [ Pins 3 and i (Left channel)
(Fig. 2) Pins 4 and i7 (Right channel)

After turning power ON in this setting, front l. & R channels
are output.

Slide switch
(531-301m05l

Power cord bushing
(J42-0083-05)

ATTEHTlilN
I

~ AC Power ooro'
(E30-)

Phano jack

(E63»0013705)
Lock terminal board

(Em-0459705) * Refer to parts list

on page 53.

ADJUSTMENT ........................................................ 22
WlRRING DIAGRAM ...................... 25
PC BOARD (Component side view).. 27
SCHEMATIC DIAGRAM . 33
EXPLODED VIEW ......... 49
PARTS LlST ........ 53
SPECIFICATIONS. .. 68

Procedure 2)

Enter the test mode. (Hold down the CHARACTER key, and in-

sert the AC plug into the outlet.)

All fluorescent displays light.

1) Press the LD/AUX key. (The front speaker outputs sound.)

2) Press the CHARACTER key. (S.W. OUT outputs sound.)
* Normally, S.W.OUT is operated by Remote control unit.

® Be sure to use the designated part (parts no. F20-1284-05)
for the isolation of the power (final) transistor.

® Y,M,X type only.

The cooling fan of the Main board (X09) is usually rotating
at a low speed but, when the heat sink temperature rises
above 80°C, temperature assurance switch Si opens and
the (an starts high-speed rotation. When the temperature
further rises above l05°C, temperature assurance switch
82 also opens and the protection circuitry is activated to stop
the output. (To release the protection, turn power OFF. To
check the highespeed rotation operation of the fan, short-
cirouit test pOInts W67 and W92.)

Page 28

PC BOARD (Component side view)

(Y,M,X type only)

(Y,M type only)

s W cm

a
.x.
x

on
2
§

0- |20V<-> 220- 240V

28

1

VIDEO 825

.RQ'EIL ZQS, ,

Refer to the schematic diagram for the vaues of registers and capacitors