Starting Diag; Starting Diag In The Protection Cancel Mode; Canceling Diag; Display Provided When Diag Started - Yamaha DSP-AX2700 Service Manual

RX-V2700/DSP-AX2700

• Starting DIAG

Press the "MASTER ON/OFF" key while simultaneously
pressing those two keys of the main unit as indicated in the
figure below.
Keys of main unit
Turn on the power while pressing these keys.
• Starting DIAG in the protection cancel
mode
If the protection function works and causes hindrance to
trouble shoot, cancel the protection function as described
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 "MASTER ON/OFF" key while simultaneously
pressing 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 when us-
ing this mode.

• Canceling DIAG

1 Before canceling DIAG, execute setting for PRESET of
DIAG menu No.11 (Memory initialization inhibited or
Memory initialized).
* In order to keep the user memory stored, be sure to
select PRESET INHIBIT (Memory initialization inhib-
ited).
2 Turn off the power by pressing the "MASTER ON/OFF"
key of the main unit or the "STANDBY" key of the re-
mote control.
22

• Display provided when DIAG started

The FL display of the main unit displays the protection
function history data and the version (1 alphabet) then the
DIAG menu (sub-menu of DIAG menu No.1
DA70Y-YSS930) a few seconds later.
When there is no history of protection function:
Opening message
When there is no history
of protection function
Version (1 alphabet)
DIAGNOSTIC
NO PROTECT F
When there is a history of protection function:
When there is a history of protection
function due to excess current
I PROTECT
Cause: An excessive current flowed through the power
amplifier.
Suppleementary information: As current of the power
transistor is detected, the abnormal channel can be identi-
fied by checking the current detect transistor.
Turning on the power without correcting the abnormality
will cause the protection function to work immediately and
the power supply will instantly be shut off.
Note)
• Applying the power to the main unit without correct-
ing the abnormality can be dangerous and cause
additional circuit damage.
• The output transistors in each amplifier channel
should be checked for damage before applying
power of the main unit.
• Amplifier current should be monitored by measuring
across the emitter resistors for each channel.
DIAG menu display
After a few seconds
1.DA70Y-YSS930
MARGIN
Version (1 alphabet)
F