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Nakamichi ZX-7 Serviced & Restored

Produktdetails

Produktgruppe
Cassettenrecorder
Hersteller
Nakamichi
Funktion
einwandfrei
Alter
43 Jahre Nach Schätzung
Gebrauchszustand
gebraucht
Optik
neuwertig
Zubehör
ohne Zubehör
Farbe
Black
Preis
3.995,00 €
Weitere Informationen
http://www.nakamichi.com/
Seriennummer
07388

Beschreibung

Nakamichi ZX-7


Power Supply and Logic PCB, fully overhauled and upgraded

All operating voltages rectified, filtered, and stabilised.

Playback head & recording head & erase head - demagnetized

Reference voltage aligned:

Reference Voltage:

Stop: 0 V (-2.0 V)

Fast Forward & Rewind: -2.0 V (-2.0V)

Pause: -6.5 V (2.6 V)

Play: -9.1 V (2.6 V)


MECHANICAL ADJUSTMENTS

Offset of Control Motor Driver Adjusted

Fine Offset Control Motor Driver Adjusted

Reel Motor Speed in Play Mode Adjusted

Record Head and Playback Head Tilt Adjusted

Head Base Stroke Adjusted

Head Base Stroke in Cue Mode Adjusted

Erase Head Stroke and Tape Guide Height Adjusted

Supply Tape Guide Height Adjusted

Take up Tape Guide Height Adjusted

Erase Head Height and Tilt Adjusted

Tape Tension Adjusted

Playback Head and Record Head Adjusted and Azimuth Aligned

Record Head Stroke Adjusted

Tape Travelling Adjusted

Flywheel Holder Adjusted

Tape Speed Adjusted

Lubricated:

Capstan Shaft

Pinch Roller Shaft

Thrust Cap

Reel Hub Shaft

Thrust portion of the Capstan Shaft

ELECTRICAL ADJUSTMENTS, CALIBRATIONS and ALIGNMENTS

• Tone Level Calibrated

Auto Azimuth PCB. Tone level calibration, 400 Hz and 15 kHz.

Level Calibration button pressed to oscillate 400 Hz.

Obtained 350 mV (Left channel)

Adjusted and obtained same level as Left channel

Pressed the Bias Calibration button to oscillate 15 kHz

Adjusted and obtained 20 dB lower level than 400 Hz level.

• Meter Level Calibrated

Auto Azimuth PCB. 400 Hz to Input and Tone 400 Hz and 15 kHz.

400 Hz feed and adjusted the Input level and obtained 350 mV (-9 dB)

Adjusted so that 0 dB segment of the level meter starts illuminating

Level Calibration 400 Hz, adjusted and obtained 350 mV (-0.25 dB)

Adjusted so that 0 dB segment of the level meter starts illuminating

Bias Calibration 15 kHz, obtained 35 mV (-0.25 dB)

Adjusted so that 0 dB segment of the level meter starts illuminating

Re-adjusted the tone level.

• MPX Filter Adjusted

19 kHz to Inputs

Output level control to maximum position

Adjusted the Input Level controls and obtained 1 V

MPX Filter ON, and adjusted and obtained the minimum reading on the voltmeter

(less than -30 dB)

• Playback Head and Record Head Height Adjusted and Azimuth Aligned

1 kHz track alignment, 15 kHz Azimuth tape, 5 kHz (-20 dB) input, Tone 15 kHz

o Playback Head Height Adjusted

o Azimuth Reference Position Adjusted

o Playback Head Azimuth Aligned

o Phase Adjusted and Record Head Height Adjusted and Azimuth Aligned

• Playback Level Calibrated

400 Hz Level Tape

o Adjusted and obtained 350 mV

o Reverse Playback

o Adjusted and obtained 350 mV

• Playback Frequency Response Adjusted

400 Hz Level Tape, 10 kHz Playback Frequency Response Tape, 15 kHz Playback Frequency

Response Tape, 20 kHz Frequency Response Tape

o 400 Hz Forward Play

4 / 4

o 0 dB on Outputs

Frequency response Adjusted:

! 10 kHz
! 15 kHz
! 20 kHz

• Bias Oscillation Frequency and Erase Current Adjusted

• Record Amplifier Equalizer Adjusted

23 kHz (-20 dB) to the Inputs

• Bias Trap Adjusted (Record Amplifier)

• Bias Trap Adjusted (Playback Amplifier)

• Record Level Calibrated and Recording Bias Current Adjusted

Tone 400 Hz and 15 kHz, and 10 kHz/20 kHz (-20 dB) Inputs

• Overall Frequency Response Adjusted

400 Hz (0 dB) and 20 Hz to 20 kHz (-20 dB) Inputs

• Crosstalk Measurements

1 kHz to Inputs

• Channel Separation Measurements

1 kHz Inputs

• Signal to Noise Ratio Measurement

400 Hz Inputs

• Total Harmonic Distortion Measurements

400 Hz Inputs

• Wow & Flutter and Speed Adjusted

3 kHz Speed and Wow/Flutter Tape
Verkäufer:

Nak Central AudioLabs

Händler Benutzerprofil
Registriert seit 05/2024
Kontakt aufnehmen
Raam Raaj
Versandinformationen
- Versand aus Vereinigtes Königreich (IG63JM)
- Käufer zahlt Versand
- Kein internationaler Versand

Zahlungsmethoden

- Barzahlung bei Abholung
- Überweisung
- PayPal

Inserats-ID

6510020128

Angebotszeitraum
Start:
13.05.2024 - 19:50
Ende:
12.07.2024 - 19:50
Angesehen

57 mal in 9 Tag(en)