Am Alignment Procedure; Fm Alignment Procedure; Stereo Separation Alignment - Marantz 2270 Manual

11 AM Alignment Procedure
AM IF Alignment
1.
2.
Connect a sweep generator to the J151 and an alignment scope to the J162.
Rotate each core of IF transformer L153 and L154 for maximum height and flat top
symmetrical response.
AM Frequency Range and Tracking Alignment
1.
2.
6.
Set AM signal generator to 525 KHz. Turn the tuning capacitor fully. closed (place the tuning
pointer at the low end.) and adjust the oscillator coil L152 for maximum audio output.
Set the signal generator to 1650 KHz. Place the tuning pointer in the high frequency end and
adjust the oscillator trimmer on the oscillator tuning capacitor for maximum audio output.
. Repeat the Step 1 and 2 until no further adjustment is necessary.
. Set the generator to 600 KHz and tune the receiver to the same frequency and adjust a slug
core of AM ferrite rod antenna and RF coil L151 for maximum output.
. Set the generator to 1400 KHz and tune the receiver to the same frequency and adjust both
trimming capacitors of Antenna and RF tuned circuit for maximum output.
Repeat the step 4 and 5 until no further adjustment is necessary.
Note: During tracking alignment reduce the signal generator output as necessary to avoid AGC
action.
12 FM Alignment Procedure
1.
2.
Connect a FM signal generator to the FM antenna terminals and a oscilloscope and an audio
distortion analyzer to the tape output jacks on the rear panel.
capacitor C102, C103, C104 and C105 for minimum distortion.
13 STEREO Separation Alignment
a
2. Modulate the FM SG with stereo composite signal consisting of only subchannel signal (01
course a pilot signal must be included). Adjust the core of L301 for maximum audio output,
then, modulate the signal generator with a stereo composite signal consisting of only L channel
signal and again adjust the core of L301 for maximum audio output.
. Adjust the trimming resistor R365 for maximum and same separation in both channels.