McIntosh MAC1500 - SERVICE MANUAL 1

MAC 15 00 MULTIPLEX
STEPS
1
2
3
4
5
6
7
8
TUNER
DIAL
SETTING
Point of no
interference
or signal
SAME
100MC
SAME
SAME
SAME
SAME
SAME
SIGNAL GENERATOR
FREQ.
Audio gener-
ator set to 67KC
0.5 volts out-
put or less
MPX generator
with 19KC pilot
attenuated to
approx. 5%
level. (5% level
is ½ of normal
10% level).
19KC pilot
MUST be at-
tenuated for
correct align-
ment
100MC modu-
lated by MPX
generator.
19KC pilot at
normal output
SAME
SAME
SAME
SAME
Tune to a strong
mono FM
station
COUPLING
TP#2
SAME
300 ohm
antenna termi-
nals with
matching net-
work. (See *
previous page)
SAME
SAME
SAME
SAME
SAME
MODULATION
1KC 100% modu-
lation (34 KC
deviation) modu-
lating left or
right only
SAME
SAME
SAME
Turn off 1 KC audio
modulation
INDICATOR
TYPE
Audio
VTVM
DC
VTVM
Audio
VTVM
Audio
VTVM
and
scope
SAME
SAME
SAME
MPX
stereo
indi-
cator
light on
receiver
CONNECTED
TO
L or R tape output
Pin 9 of 6EA8
Pin 1 or 2 of T-7
L or R tape output
SAME
SAME
SAME
4