Sharp MZ-700 manual Playback, Fast, Forward, Rewind

Mechanical adjustments

RECORD/FAST FORWARDjREWIND torque measure- ments

1.Set the torque measuring instrument on the cassette tape recorder.

2.Torque value under each mode must be as follows:

Position	Torque measuring		Value
	cassette
PLAYBACK	TW-2111	30	'" 70gram·cm
FAST	TW-2231	60	'" 160gram·cm
FORWARD
REWIND	TW-2231	60	'" 160gram·cm

Record/playback head azimuth adjustment

1.Set the instrument as shown in Fig. 4-2.

2.Playback the test tape (Teac's MTTlll, recorded with 3KHz signals).

3.Adjust the head azimuth adjusting screw so that the reading on the digital voltmeter is at its maximum value.

Cleaning of head

The head is critical for a proper performance of the tape recorder. Dust on the head, capstan, pinch roller, etc. impedes proper recording and playback. Open the cassette holder, take out the tape, push down the PLAYBACK pushbutton, then clean those components. If you can see any oxide deposit, clean them using a cotton bud damped with alcohol.

RECORD pushbutton can not be pushed in

The RECORD pushbutton can not be pushed in, if the erasure protect tab of the cassette tape is broken. Forcible depression of the button may result in machine failure.

Tape speed adjustment

1.Connect the wow-flutter measuring instrument to :f#!, pin of the CNW3001 connector.

2.Playback the test tape (UKOG-0119CSZZ, MTT-1l3 recorded with 8KHz signals). Use the middle part of the tape for the test.

3.Adjust the semi-fix~resistor located on the Motor Board so that the playback frequency should become 8000 ± 250Hz.

Collector of transistor 03003 Digital voltmeter

Test tape,

MTT-113

Figure 4-2.

Pinch roller Head

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