Casio EG-5, Руководство по обслуживанию

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ADJUSTMENT
Equipments required
Oscilloscope
Frequency counter
Test tapes, MTT-111N (0004 5032) and MTT-113N (0004 5033)
Two 8-ohm resistors
Pre-adjustment procedure
1. Clean the head and all tape handling surfaces using standard cleaner and cotton swabs.
2. Connect an 8-ohm dummy load to headphone jack of each channel.
3. Set the main volume to the maximum.
4. Set the tape speed volume to the center position.
Head azimuth adjustment
Never use a magnetized screwdriver for this adjustment.
The head azimuth adjustment screw is located just under the notch which can be seen when opening the
cassette door.
1. Connect a oscilloscope to the dummy loads.
2. Set a tape MTT-113N holding the door open, and playback the tape.
3. By turning the adjustment screw slowly, adjust for amplitude of both channels at maximum and adjust for
the waveforms in the same phase reading on the oscilloscope.
8-ohm Dummy Load
Phone Jack
8-ohm Dummy Load
R-ch
L-ch
EG-5
Oscilloscope
Ch 1
Ch 2
OK
NG
NG
< Figure 2 >
Tape speed adjustment
The tape speed adjustment volume VR32 is located on M370-MA3M PCB.
1. Connect a frequency counter to the dummy load.
2. Playback a test tape MTT-111N.
3. By turning the volume, adjust for 3000 Hz
±
30 Hz reading on the frequency counter.
Phone Jack
8-ohm Dummy Load
EG-5
Frequency Counter
< Figure 3 >