History Of Protection Function - Yamaha RX-Z9 Service Manual

RX-Z9/DSP-Z9
When there is a history of protection function:
The FL display appears as shown below depending on the
type of the protection function.
The protection function worked due to exces-
sive current through the amplifier. Causes
could be a short at the speaker terminal or a
defect in the amplifier. The protection func-
tion activates immediately to turn off the
power, with no history display at turn-on, if
the amplifier is defective.
The protection function worked due to a de-
fect or overload in the power supply. If the
power is turned on with the abnormality un-
solved, the protection function works in about
1.5 seconds to turn off the power.
The protection function worked due to a DC
voltage appearing at the speaker terminal.
A cause could be a defect in the amplifier. If
the power is turned on with the abnormality
unsolved, the protection function works in
about 4 seconds to turn off the power.
The protection function worked due to the
temperature limit being exceeded. Causes
could be poor ventillation or a defect related
to the thermal sensor. If the power is turned
on with the abnormality unsolved, the pro-
tection function works in about 2 seconds to
turn off the power.
For detection of each protection function (except I-PROTECT)
, refer to DIAG MENU No.19 AD/FAN (p.64).

History of protection function

When the protection function has worked, its history is stored
in memory with a backup. Even if no abnormality is noted while
servicing the unit, an abnormality which has occurred previ-
ously can be defined as long as the backup data has been
stored.
The history of the protection function is cleared when DIAG is
cancelled by selecting PRESET RESERVED (Memory initial-
ized) of DIAG menu No.18 or when the backup data is erased.
36
I PROTECT:xx
VER M/V/D=B/E/G
PSx PROTECT:xx
VER M/V/D=B/E/G
DCx PROTECT:xx
VER M/V/D=B/E/G
TMPx PROTECT:xx
VER M/V/D=B/E/G