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SERVICE HINTS
1. When the magnetic head is serviced:
Make sure that the terminal connection is as shown in the
Fig. 2, Otherwise, the platter may turn reversely,
Adjust the space between the magnetic head and magneti-
cally coated surface of the platter to 0.2mm by inserting a
piece of paper and secure it. Take note that variation of .
.
this space causes variation
of stopping condition of the
platter, or the decay time of the rotation detection circuit.
Normal condition while the turntable mat being removed
is that there remains a slight forward glinding of platter .
when ea
ever allow reverse movement of P Piette _ pee
:
_. Damage of equipment because. of missetting of voltage
when stopping: ©
HOT
(Rea)
< .
2. Confirming regulator voltage:
An IC is employed for regulation voltage, allowing no fine"
adjustment. Confirm this voltage is SV.
3. Adjustment of speed (KU-351)
(1) Connect a dual trace oscilloscope to i 1 on KU al
P. W. board,
(2) Start 45 rpm rotation first.
| Adjust VR 2: sO that the sampling pulse comes at 60%
position from starting edge of the s saw tooth waveform.
(See Fig. 3. a
|
|
_ (3). Change. over to 33 rpm. and adlude VR 1 to sta the
__pulse to 60% position in the same-manner,
NOTE
~- {f a single trace oscilloscope is used for adjustment, connect
the
ground terminal
of the oscilloscope: 'to the sampling
< waveform output of TP-1 instead of connecting to ground
terminal thereof. Duplexed waveform can be observed:
Fig.3
Speed adjustment
CAUTION!
(Models with the voltage selector)
This equipment has been preset for a line voltage of 220V.
Before inserting the power plug, please check if this voltage
corresponds with the line voltage in your area. If it does
not, be sure to adjust the voltage. selector switch to the
.. Proper setting before operating this equipment. The voltage
selector switch is focated on the base surface below the
turntable.
platter.
Simply. insert a screw driver into. the
. "voltage selector switch and 'turn it in either: direction: so. that
~~ selector is not within the limit of DENON liability.
Voltage set at 220 V
Voltage Selector Switch
Fig. 4 Voltage Selector Switch
Set the voltage selector
in accordance
with the nominal
power supply voltage as shown in the table.
ACTUAL
(nominal)
}
LTAGE
SETTING
VOLTAGE (volt)
Table 1.
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