Yamaha RX-397 Service Manual page 10

RX-397
Starting DIAG
Press the "STANDBY/ON" key of the main unit while simul-
taneously pressing the "FM/AM" key and the "8" key to acti-
vate the DIAG function.
Turn on the power while pressing these keys.
Starting DIAG in the protection cancel
mode
If the protection function works and causing hindrance to
trouble diagnosis, cancel the protection function as de-
scribed below and it will be possible to enter the DIAG mode.
(The protection functions other than the excess current
detect function will be disabled.)
Press the "STANDBY/ON" key while simultaneously press-
ing those two keys indicated in the figure above. At this
time, keep pressing those two keys for 3 seconds or longer.
In this mode, the "SLEEP" segment of the FL display of the
main unit flashes to indicate that the mode is DIAG mode
with the protection functions disabled.
CAUTION!
Using this product with the protection function disabled
may cause damage to itself. Use special care for this point
when using this mode.
Canceling DIAG
1
Before canceling DIAG, execute setting for PRESET of
DIAG menu No.2 (Memory initialization inhibited or
Memory initialized).
* In order to keep the user memory stored, be sure to se-
lect PRESET INHIBITED (Memory initialization inhibited).
Protection history will remain in memory.
2
Turn off the power by pressing the "STANDBY/ON" key
of the main unit.
10
Display provided when DIAG started
On the FL display of the main unit, an opening mes-
sage (including the version and the protection history)
appears for a few seconds followed by the diagnostic
menu display (1. VFD CHECK).
When there is no history of protection function:
Opening message
When there is no protection history.
NO PROTECT
Version (1 alphabet)
DIAG menu display
1. VFD CHECK
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 excessive current
through the amplifier. The protection function activates im-
mediately to turn off the power, with no history display at
turn-on, if the amplifier is defective.
I PROTECT
The protection function worked due to a defect or overload
in the power supply. The abnormal voltage is displayed in
% based on 5V as 100%. If the power is turned on with the
abnormality unsolved, the protection function works in about
1 second to turn off the power.
PS PRT :000 Z
Z
After a few seconds.
Z