Marantz MR235 - Multiplex Alignment Procedures; AM Alignment Procedures

3.2 MULTIPLEX ALIGNMENT PROCEDURES
(Selector switch in the “FM” position)
Signa! Source Signal
Connection Frequency
No
RF generator to FM modulation
antenna terminals
through matching
network (300 ohms,
balanced), with 1mV
FM stereo simulator
RE level and 100%
modulation (pilot 9%)
Stereo, left
(1,000 Hz)
Stereo, right
(1,000 Hz)
3.3 AM ALIGNMENT PROCEDURES
(Selector switch in the ““AM”’ position)
Signal Source Signal
Connection Frequency
Set Dial
Pointer to:
Indicator
Connection
R326 so that frequency
counter may precisely
read 19 kHz.
Frequency counter
to point (E) (J140)
VTVM to right
channel output
(W002, White)
R316 for maximum
output and same
separation in both
channels.
VTVM to left
channel output
terminal (H) (J123)
(W002, Red)
Repeat steps 2 and 3.
Set Dial
Pointer to:
Indicator
Connection
No connection No signal
Sweep generator to 455 kHz
point (F) marker
515 kHz
1,650 kHz
RF generator to
AM antenna terminals
through IHF dummy
600 kHz
1,400 kHz
AM IF ALIGNMENT
R228 to that signal
strength meter MOOt
may read 0.
L154 for maximum
and symmetric
response.
Oscilloscope to Quiet point on
point G) (J141) band.
AM RF ALIGNMENT
L153 for maximum
output.
515 kHz with
tuning gang closed.
1,650 kHz with
tuning gang open.
OSC, trimmer for
maximum output.
VTVM to Lor
R channel output
(W002)
LOO1 for maximum
output.
600 kHz
Ant. trimmer for
1,400
kHz
maximum
output.
Repeat steps 1 to 4 as necessary to obtain maximum sensitivity.