Yamaha HTR-5450 Service Manual page 10

RX-V520/RX-V520RDS/HTR-5450/HTR-5450RDS
• Starting DIAG
Press the "POWER " (STANDBY/ON) key of the main unit while pressing the
"FM/AM " key and the "INPUT MODE " key simultaneously, and DIAG will be
activated.
• Starting DIAG in the protection cancel mode
If the protection function activates and causes hindrance to trouble diagnosis,
disable the protection function as described below, and it will be possible to enter
the DIAG mode. (The protection function other than the excess current detect
function will be disabled.)
Press the "POWER" (STANDBY/ON) key while pressing the "FM/AM" key and
the "INPUT MODE" key simultaneously. At this time, keep pressing the "FM/AM"
key and the "INPUT MODE" for 3 seconds or longer.
In this mode, "SLEEP" in the FL display of the main unit flashes.
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
Turn off the power by pressing the "POWER" (STANDBY/ON) key of the main unit or the "STANDBY" key of the remote
control unit.
CAUTION: When canceling this function, check that DIAG menu No.10 PRESET (memory initialization inhibited/reserved)
has been set. [To keep the user memory, be sure to select "INHI" (initialization inhibited) from the No.10 PRESET menu
before canceling the DIAG function.]
• Display at the start of DIAG
On the FL display of the main unit, an opening message (including the version and the protection history) appears for a few
seconds followed by the diagnostic menu display of 1. ANALOG BYPAS.
Opening message
When there is no
protection history (*1)
(*1) If a protection function history has been recorded, the type of the protection function and the voltage value recorded last
are displayed.
If the protection function activates after DIAG has been started and the power is turned off;
When the protection function (*2) activates, the protection function history appears on the display and the power turns off.
Repair the faulty parts according to the displayed history.
(*2) When an excess current or any other faulty condition is found with the power source, DC, etc., the protection function
forces the power to turn off.
9
DIAG menu display
Version (1 alphabet)
After a few
seconds
I PROTECT display
(When the power is turned on without this abnormality corrected, the protection
function activates the moment the power relay is turned on to shut off the power relay.
The display will not light.)
Cause: There is an abnormal current flow to the power amplifier.
Supplementary information: As the current of the power transistor of each channel
is detected, the abnormal channel can be identified by checking the current detect
transistor.
Keys of main unit
INPUT MODE
FM/AM
Turn on the power while
pressing these keys.