Tape Speed Adjustment; Head Output Signal; Bias Oscillator Frequency And Level Adjustment - Kenwood RXD-M57MP-H Service Manual

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2. Insert a 10 kHz test tape (Teac MTT-1141V or Equivalent) into the tape mechanism and play it back.
3. While playing back the test tape, slowly turn the azimuth adjusting screw until the amplitude of both
channel output waveforms is maximum and in phase. Note: Reiteration adjusting Right, lift the screw,
until the amplitude of both channel output waveform is maximum. (See Figure 2.)
4. Secure the azimuth screw in place with glue or paint after making the adjustment.

Tape Speed Adjustment

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1. Set the function switch to TAPE.
2. Connect a frequency counter with a 32 ohm dummy load to the stereo headphone jack. (See Figure 3.)
3. Insert and play back a 3 kHz test tape (Teac MTT-111 or Equivalent) into the tape mechanism.
4. Insert an insulated alignment tool and adjust the tape speed potentiometer (MOTOR) until the
frequency counter indicates 2940 Hz to 3090 Hz.

Bias Oscillator Frequency and Level Adjustment

1. Set the function switch to TAPE and the record and play tape mechanism to RECORD.
2. Connect a VTVM and frequency counter to test point R/P HEAD.
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3. Adjust bias oscillator coil L203 until the frequency counter indicates 67 kHz ± 0.5 kHz.
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ADJUSTMENT
Figure 2. Head Output Signal
FREQUENCY COUNTER
DUMMY LOAD
Figure 3. Tape Speed Adjustment
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