Yamaha RX-V800 Service Manual page 12

RX-V800/RX-V800RDS/HTR-5280
When there is a history of protection function:
When there is a history of
protection function against
excess current
When there is a history of
protection function against
abnormal voltage in the
power supply section
Voltage display in %
When there is a history of
protection function against
abnormal DC output
Voltage display in %
* Besides above possible causes for abnormality, a cause may lie in disconnected connector, around CPU, etc.
* For the protection voltage value, refer to DIAG menu No.10 described later.
• 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 previously 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 RESERVED (Memory initialized) of
DIAG menu No.9 or when the backup data is erased.
• Display during menu operation
During the DIAG operation, the menu list described in the section of the startup screen appears on the superimposed screen
and the function at work is indicated on the FL indicator. The contents displayed during the function operation are described
in the later section on details of functions.
• Operation procedure of DIAG menu and SUB-MENU
There are No.1 to No.13 MENU items, each of which has some SUB-MENU
items.
DIAG menu selection
Main unit: Select the menu using • (Forward) and ¶ (Reverse) keys of
PRESET/TUNIG located in the sealing panel.
Remote control unit: Select the menu using
SUB-MENU selection
Main unit: Select the sub-menu using • (Forward) and ¶ (Reverse) keys of
PROGRAM located in the sealing panel.
Remote control unit: Select the sub-menu using • (Forward) and ¶
(Reverse)keys.
* Only the remote control keys indicated in the MENU List can be used to select
a sub-menu directly.
11
Cause: An excessive current flowed to the power amplifier.
Supplementary information: As current of the power transistor is detected, the
Version
(1 alphabet)
abnormal channel can be identified 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 soon be shut off.
Cause: The voltage in the power supply section is abnormal.
Version
Supplementary information: The abnormal voltage is displayed in % based on
(1 alphabet)
5V as 100%.
Turning on the power without correcting the abnormality will cause the protection
function to work 1 second later and the power supply will be shut off.
Cause: DC output of the power amplifier is abnormal.
Version
Supplementary information: The abnormal voltage is displayed in % based on
(1 alphabet)
5V as 100%.
Turning on the power without correcting the abnormality will cause the protection
function to work 3 seconds later and the power supply will be shut off.
(Forward) and (Reverse)keys.
DIR A
PRESET/
TUNING
DIAG menu selection
PROGRAM
SUB-MENU selection
Use these keys for
DIAG menu selection.
DIR B
SELECT
Use these keys for
SUB-MENU selection.