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Marantz 2250B Service Manual

Marantz 2250B
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Marantz 2250B Specifications

General IconGeneral
Power Output50 watts per channel into 8Ω (stereo)
Total Harmonic Distortion0.1%
Damping Factor45
Input Sensitivity2.2mV (MM), 180mV (line)
Speaker Load Impedance4Ω to 16Ω
Tuning RangeFM

Summary

AM Alignment Procedures

AM IF Alignment

Align AM IF transformer L153 for maximum height and flat top symmetrical response.

AM Frequency Range and Tracking Alignment

Align AM oscillator coil L152 and ferrite rod antenna/RF coil L151 for maximum audio output.

AM Signal Strength Meter Alignment

Adjust R178 for 90% signal strength meter reading at 1000 kHz.

FM Alignment and Audio Adjustments

FM Oscillator and Trimmer Alignment

Align FM oscillator coil L104, C106, L101, L102, L103, L105 for max output and min distortion.

Discriminator and Tuning Meter Alignment

Align discriminator transformer L201 for center tuning meter indication.

FM Signal Strength Meter Alignment

Adjust R374 for 90% signal strength meter reading at 98 MHz.

Stereo Separation Alignment

Align R311 for 19 kHz reading and R301 for maximum stereo separation.

Muting Circuit Alignment

Align R363 for 0.75V DC and R362 for proper muting circuit frequency shift.

Dolby FM Tape Output Setting

Set RC01, RC02 for 580mV output at TAPE OUTPUT terminals for Dolby FM.

Voltage Adjustment

Adjust R806 for 35V DC between pin terminals 804 and 805.

Main Amplifier DC Off-set Alignment

Adjust R707 for 'zero' DC output on speaker terminals.

Idle-Current Adjustment

Adjust R719 for 10mV DC between pin terminals 708 and 710.

Phono-Amplifier Adjustment

Adjust R408, R409 for equal clipping level during 1 kHz signal input.

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