Mitsubishi HS-U778 Specifications download pdf (Page 47)

3-3. A/C HEAD Adjustment

3-3-1. Slant Adjustment of A/C HEAD

1. Play back a blank tape.

2. Slowly turn the slant adjustment Screw C shown in the

Fig. 3-3-1 counter-clockwise to slightly crease the

bottom of the tape at the Lower FLANGE of the

GUIDE POLE (TU).

3. Slowly return the slant adjustment Screw C to remove

the crease.

4. Slowly turn the slant adjustment Screw C counter-

clockwise again and stop just before the tape is

creased.

3-3-2. Azimuth and Height Adjustment of

A/C HEAD

1. If the height of the CONTROL HEAD is shifted from

the specified value in the Fig. 3-3-2, adjust it with the

Height Adjustment Screws A, B and C shown in the

Fig. 3-3-1.

2. After adjustment with the Screws A, B or C, repeat the

Item 3-3-1. "Slant Adjustment of A/C HEAD".

3. Connect the oscilloscope to the audio output terminal.

Play back an alignment tape (NM6KE2 : 859C339O90).

5. Turn the Azimuth Adjustment Screw B in the Fig. 3-3-1

to set the audio output level in the Fig. 3-3-1 at the

maximum. After the adjustment, remove the screw

driver and confirm that the audio output level is 4.6

divisions or more when the maximum audio output

level is set to 5. If the audio output level is less than

4.6, repeat steps 1 ~ 5.

6. Push the A/C HEAD to the right and left (in the

direction of A-A' in the Fig. 3-3-1) and release it. And

confirm that the audio output level does not change.

(Do not push the A/C HEAD until the audio output

level is reduced to 3/4 or less of its maximum level.)

7. Confirm that changes in the audio output level are 2dB

or less in the PLAYBACK mode.

8. If the change in the audio output level exceeds 2dB,

repeat the Item 3-3-1. "Slant Adjustment of A/C

HEAD".

9. If the above procedure steps 1 ~ 8 proves to be

unsatisfactory, replace the TAPE GUIDE ASSY (SP)

and the TAPE GUIDE ASSY (TU), according to the

Item 2-32. "TAPE GUIDE ASSY (SP), TAPE GUIDE

ASSY (TU)".

Tape

Screw C

Screw A

Screw B

0.0 mm

0.25±0.03 mm

AE HEAD

AUDIO HEAD

CONTROL HEAD

Reference Line

Maximum

6kHz Audio Output Signal

Fig. 3-3-3

Fig. 3-3-2

Fig. 3-3-1

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 83 84

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Mitsubishi HS-U778 Specifications Page 47

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