Alto MAC 2.3 Service Manual

CH1
CH2
CH3
POWER
V
A
11 0
NORL
SHORT
220
NORL
110V
220V
LOAD SEL.
LOAD OUT
LOAD
S.P.
AC
UNSWITCH
DC IN
DC OUT
+
+
_
ADR-245
-
+
INPUT
OUTPUT
+
-
-
+
SET LEVEL
POWER
OUTPUT (600 )
+
-
POWER
AUDIO GENERATOR GAG-810
0-90dB
0-10dB
0-1.0dB
INPUT
+
-
OUTPUT
+
-
EXT
INT
600 LOAD
POWER
LABORATORY DC POWER SUPPLY
DUAL TRACKING WITH 5V FIXED
MODEL: GPC-3060D
-
+
GND
-
+
GND
-
+
5V 3A
CURRET
VOLTAGE
CURRET
VOLTAGE
4
8
16
LINK
LINK
CH-B
CH-A
LF 30Hz
FILTER
OFF
ON
OFF ON
BA LA NC E 1.15V/20K
INPUT
INPUT
CONNECTION
BREAKER
AC IN 50/60HZ
SHOCKHAZARD
RISQUEDE CHOCELECTRIQUE
ELECTRIC SHOCK HAZARD. DO NOT REMOVE COVER.
REFER SERVICING TO QUALIFIED PERSONNEL. SEE
INSTRUCTION MANUAL.
AVIS RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
CLIP LIMIT
7.1. S t ereo mode
7.1.1 I nput 1KHz s i gnal , l oad 4 Ohm , out put v olt age should be m ore t han 32V(MAC2.2)/
44V (MAC2.3)/ 55V(MAC2.4) , (CH -A &CH-B)
7.1.2 Set the SW on the rear panel to the STEREO position .
7.1.3 Turn o n t he uni t , t he S I G and C LI P -LE D should be light off w hen whitout s i gnal input .
T he S I G LED w i l l light on when input signal. I f t he C LI P -LE D lights on when the
7.1.4 B andw i dt h, di s t ort i on, S / N rat i o, pl eas e ref er t o t he s pec i f i c at i on .
7.1.5 Input 1KHz s i gnal , t urn on the C LI P -LI M I T SW, the output is not increase when the input
signal level increases gradually .
7.1.6 Input 30Hz s i ne w av e, output power i s 1W. After t urns on Fl i t t er , t he out put will attenuate 9 1.5 dB .
7.2. Paralle mode
7.2.1 Set the S W t o PA PA L LE L position, input signals from CHA; CHA,B have the output signal.
7.3. B ri dge d mode
7.3.1 Set the SW to bridged position ,input signal from CHA, the output should be more than 60V(MAC2.2)
/ 80V(MAC2.3 ) / 105V(MAC2.4).
28
Test Product
7. Test Procedure and Test Result
output level is too high

Alto MAC 2.3 Specifications

General

Brand	Alto
Model	MAC 2.3
Category	Amplifier
Language	English