Fostex X-24 service manual Mixer Section, Recorder Section

Page 5

X-24

MIXER SECTION (continued)

Distortion

 

(With 400 Hz HPF & 30 kHz LPF)

0.05 % or less (Input: 1 kHz / 0 dBV signal, MIC GAIN: LINE, LINE

 

OUT: 0 dBV.)

 

0.2 % or less (Input: 1 kHz / 0 dBV signal, MIC GAIN: LINE,

 

PHONES: 3 mW / 16Ω.)

Fader Attenuation

70 dB or more at 1 kHz (from standard fader position)

Crosstalk

60 dB or more at 1 kHz (Input: MIC IN, MIC GAIN: LINE, OUT: SEND

 

OUT. Measure level at non-input channel.)

PAN Crosstalk

42 dB or more at 1 kHz (Input: MIC IN, MIC GAIN: LINE, OUT: LINE

 

OUT. Measure level at non-input channel.)

Click Noise

 

Power on / off

-20 dBVp-por less

Other switching

-30 dBVp-por less

Shock Noise

-30 dBVp-por less (Measure noise level when one side of appliance is

 

dropped 3 times from 5 cm height.)

RECORDER SECTION

Tape Speed

9.5 cm/s ± 1.5 % (3000 Hz ± 45 Hz when reproducing TCW-211 test

 

tape.)

 

 

Wow & Flutter

 

 

 

PLAY

0.25 % or less (TCW-211 test tape, ANSI WTD.)

 

REC & PLAY

0.30 % or less (AC-514 test tape, ANSI WTD.)

 

Pitch Control

 

 

 

MIN (PITCH VR: Fully CCW)

-45 % or less (TCW-211 test tape)

 

MAX (PITCH VR: Fully CW)

+12 % or more (TCW-211 test tape)

 

Fast Winding Time (FF / RWD)

150 ± 20 sec. (TAPE: C-60)

 

 

Tape Counter Deviation

0 ± 7 (FF from BOT to EOT and then RWD to BOT again.)

Standard Level

 

 

 

PLAY

-10 ± 1 dB (TCW-231 test tape)

 

 

REC & PLAY

-10 ± 1 dBV (AC-514 test tape, 1 dB or less of level difference between

 

channels is also required.)

 

 

Frequency response

 

 

 

PLAY

Test tape: SCW-977 / TCW-284F (NR: OUT)

 

 

+3 dB

 

 

 

-3 dB

 

 

 

40 Hz

400 Hz

12.5 kHz

REC & PLAY

Test tape: AC-514 (NR: OUT, recording level: 0 dB)

 

 

+3 dB

 

 

 

-3 dB

 

 

 

40 Hz

400 Hz

12.5 kHz

Test tape: AC-514 (NR: IN, recording level: -25dB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

dB

 

 

 

 

 

 

6 dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

250 Hz

10 kHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12.5 kHz

5

Image 5
Contents Model Safety Instructions Table of Contents Mixer Section DefinitionRecorder Section Mixer SectionRecorder Section CONTROLS, Indicators & Connectors Front Panel Routine Maintenance Cleaning HeadTest Equipment and Adjusting Tools Demagnetizing ProceduresCapstan and pinch roller DemagnetizingVolume & SW setting Tape Travel Check and AdjustmentCheck and Adjusting of Head Azimuth Tape Speed Check and AdjustmentCoarse Bias Adjustment Erase Current AdjustmentPlayback Frequency Response Calibration Record Level Calibration14. T.H.D. Measurement Overall Frequency Response AdjustmentErasure Measurement Cross Erasure MeasurementClick Noise Measurement Sync crosstalk measurement18. S/N Measurement Transport Exploded View & Parts List Table of Adjusting ItemsOverall Exploded View & Parts List Overall Exploded View Transport Exploded View PCB Pattern Drawing Regulator PCBs Mixer PCB Parts ListPCB Jack PCBVT, DSK10C-BT Abbreviation Regulator PCBMixer / Jack PCBs BlockPCB Regulator PCBsREC TRK Block Diagram