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MK-100
Mechanical Adjustments and Repairs
1. Head replacement and adjustment
Clean and demagnetize
the head and guide each time the
machine
is serviced,
If normal
fidelity
is not obtainable
head replacement is indicated.
Head replacement
1) R/P head
Remove two wires soldered to head.
*
Remove a screw and head nut.
Then replace head.
Solder as shown in Fig. 11.
2) Erase head
Remove two wires soldered to head.
Remove a screw and replace head.
Solder as shown in Fig. 11.
Location of heads
The R/P and Erase heads should be positioned as shown in
Fig. 13.
Azimuth adjustment of the head should be done according
to the following instructions.
Screw
7
'
:
nad
Screw
R/P Head
E. Head
Head nut
Fig. 11
Fig. 12
@
Screw
E. Head
R/P Head
Fig. 13
Azimuth adjustment
1) Plug a cord into the earphone jack (EAR) and connect a
6 ohm
resistor
(corresponding
to a loudspeaker)
in
parallel with the cord.
2) Connect
an oscilloscope or electronic voltmeter across
the terminals of the cord.
3) While
playing
back
a test 6.3kHz tape (VTT-651)
for
azimuth adjustment, adjust head nut (Fig. 13) so that
the maximum output can be obtained.
4) If no test tape is available, play back a music cassette
and adjust for maximum
output and clarity in the high
frequency range.
5) Be
sure
to
lock
the
head
nut
() with
paint
after
adjustment.
2. Pinch roller arm adjustment (Pressure of pinch
roller)
Pressing the pin indicated
by the arrow to the play back
mode. Fig. 12
Check to see that the gap between the stopper of head base
and the pinch roller arm should be within 0.3 to 0.7mm.
If it is beyond the limits, adjust it by bending the part @) of
pinch roller arm as shown in Fig. 14.
Head base (stopper)
@)
Pinch roller arm
Fig. 14
3. Timing of review action
Move slide control to play (start) position.
Press Review button as far as pin@hits the plastic cam).
Check clearance of ©) for idler pressure, and bend © so
that lid lock plate is kept in place.
Press
|
No. 0002
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