Sharp DV-5145, Service Manual

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5. Key operation at each mode
1 10
10
Normal mode Preset mode
When one of “1” to “10” keys is pushed, the data
of the corresponding position is read out of the
memory so that the desired station is tuned in.
The currently selected station is stored as lastly
selected position in the memory.
When one of “1 to “10” keys is pushed, the
corresponding position is displayed on LED. But
the data in the memory remains as it is.
Not operative.
When FT(+) or key is pushed, APT is turned
off and the unit performs a sweeping of tuning
voltage. And when the key is touched off, the data
of tuning voltage is written in the memory.
Within 2 seconds after “10” key has been pushed,
when one of “I” to “6” keys is pushed, one of
to “16” positions is displayed and tuned in;
when one of “7” to “IO” keys is, however,
pushed, one of to “10” positions is displayed
and tuned in.
When or key is pushed, the unit performs
a sweeping of tuning voltage. And when the key is
touched off, the data of tuning voltage is written in
the memory.
When FT(+) or key is pushed, the unit
performs a sweeping of tuning voltage. And when
the key is touched off, the data of tuning voltage is
written in the
Within 2 seconds after “10” key has been pushed,
when one of “1” to “6” keys is pushed, one of
“11” to “16” positions is displayed but not tuned
in since the data in the memory is kept as it is.
6. Tuning operation
When one of “1” to “IO” keys is pushed in the normal
mode, the corresponding data is read out of the EA
ROM so that the band output and tuning voltage are set
up to allow the unit to tune in the desired station. Then
the currently tuned in station is stored as a lastly
selected position in the specified address of EA ROM.
During the tuning operation, AFT output and MUTE
output are caused in the following timing.
I
I
I
I
l
Figure 1-2