Aiwa CSD-MD50 Manual de servicio descargar pdf (Pagina 40)

< CD SECTION >

8. Tracking Balance Adjustment

Oscilloscope

(DC range)

–

TP2 (TB)

TP3 (VREF)

1) Connect an oscilloscope to the test points TP2 (TB) and

TP3 (VREF).

2) Turn on the power switch.

3) Insert test disc TCD-782 (YEDS-18) and press the CD

PLAY button.

4) Adjust SFR501 so that the waveform on the oscilloscope

is vertically symmetrical as shown in the figure below.

5) After the adjustment is completed, remove the connected

lead wires from the terminals.

A = B

VOLT/DIV: 0.2V

TIME/DIV: 1mS

< DECK SECTION >

9. Tape Speed Adjustment

Settings: • Test tape: TTA-100

• Test point: CN201

• Adjustment location: SFR1

Method: Playback the test tape by adjust SFR1 so that

the frequency counter reads 3000Hz±10Hz.

Check that the counter reading in the REV

mode is within the range of ±45Hz of that in

the FWD mode.

10. Azimuth Adjustment

Settings: • Test tape: TTA-300

• Test point: J201 (PHONES)

• Adjustment location: Head azimuth

adjustment screw

Method: Playback the 10kHz signal of the test tape and

adjust the adjustment screw so that the output

becomes the -0.5dB point below the maximum

reading. The adjustment must ends with the

clockwise rotation of the adjustment screw.

Perform this adjustment in both FWD and

REV directions. Fix the adjustment screw with

adhesive agent upon completion of adjustment.

< TUNER SECTION >

< FM SECTION >

IHF Sensitiviy: More than 20dB

(THD 3%) (at 88.0/98.0MHz)

More than 22dB

(at 108MHz)

Signal to noise ratio: More than 55dB

(at 98.0MHz)

Distortion: Less than 1.5%

(Input: 54dB) (at 98.0MHz)

Stereo separation: More than 20dB

(at 98.0MHz)

Intermediate frequency: 10.7MHz

< AM SECTION >

Sensitivity: 54dB±6dB (at 603kHz)

(S/N 20dB) 52dB±6dB

(at 999/1404kHz)

Signal to noise ratio: More than 36dB

(Input: 74dB) (at 999kHz)

Distortion: Less than 2.0%

(at 999kHz)

Intermediate frequency: 450kHz

< DECK SECTION >

Tape speed: 3000Hz±60Hz

Wow & flutter: Less than 0.21%

(W.R.M.S)

Take-up torque: 30-55g-cm (FWD, REV)

F.F torque: 75-160g-cm

REW torque: 75-160g-cm

Back tension: 3±4g-cm (FWD, REV)

PB Output level: 190mV±1dB (LINE OUT)

REC/PB Output level: 190mV±2dB (LINE OUT)

Distortion (REC/PB): Less than 3%

(NORM, CrO

Noise level (PB): Less than 3.5mV

(DOLBY NR OFF, NORM)

Noise level (REC/PB): Less than 3.5mV

(DOLBY NR OFF, NORM)

Erasing ratio: More than 55dB

REC bias frequency: 85kHz

Test tape: NORMAL TTA-100

CrO2 TTA-200

PRACTICAL SERVICE FIGURE

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Aiwa CSD-MD50 Manual de servicio Pagina 40

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