Yamaha RX-797 Service Manual page 12

RX-797
1. DISPLAY CHECK
This program is used to check the FL display section. The
display condition varies as shown below according to the
sub-menu operation.
Initial display
All segments OFF
All segments ON
(dimmer 100%)
All segments ON
(dimmer 50%)
Lighting of segments
in lattice
Segment conditions of the FL driver and the FL tube are
checked by turning ON and OFF all segments. Next, the
operation of the FL driver is checked by using the dimmer
control. Then a short between segments next to each other
is checked by turning ON and OFF all segments alternately
(in lattice). (In the above example, the segments in the sec-
ond row from the top are shorted.)
12
Lighting in lattice
Short Normal
2. FACTORY PRESET
This menu is used to reserve/inhibit initialization of the back-
up RAM.
2.PRESET INHI
PRESET INHIBIT (Initialization inhibited)
RAM initialization is not executed. Select this sub-
menu to protect the values set by the user.
Note: The protection history will not be erased using
PRESET INHIBIT.
2.PRESET RSRV
PRESET RESERVED (Initialization reserved)
Initialization of the back-up RAM is reserved. (Actu-
ally, initialization is executed the next time that the
power is turned on.) Select this sub-menu to reset
to the original factory settings or to reset the RAM.
Use PRESET RESERVED to erase the protection
history.
CAUTION: Before setting to the PRESET RESERVED, write down
the existing preset memory
content of the Tuner in a table as shown below. (This is be-
cause setting to the PRESET RESERVED will cause ALL user
memory contents to be erased.)
Preset group
P1
A
B
C
D
E
Preset group
P5
A
B
C
D
E
P2 P3 P4
P6 P7 P8