Toshiba RAS-18YKH-E Service Manual page 23

<Self-diagnosis by check codes>
1) The self-diagnosis by the check codes is con-
ducted under the block displays of item B-H in
Table 9-2-1.
2) Remote control key operation under the service
mode is conducted by ON/OFF or TEMP. The
remote control display by each key operation is
varied as shown below. Two digit number is
displayed in a hexadecimal number.
3) The self-diagnosis by the check codes is con-
ducted with procedures shown below.
a) Enter the service mode and make sure the
off timer display of the remote control shows
.
b) Operate the "ON/OFF" key and make sure
the timer lamp on the display section is
flashing (5 Hz).
Operating key
ON/OFF
TEMP. (Up)
TEMP. (Down)
"AUTO" LOUVER
"SET" LOUVER
Table 9-2-3
1 is added to data before operation.
(Example)
1 is subtracted from data before operation.
(Example)
10 is subtracted from data before operation.
(Example)
Data before operation is directly transferred.
(Example)
– 23 –
c) At the same time, also make sure the opera-
tion lamp is also flashing. This shows that
the protection circuit on the indoor P.C. board
is working.
d) Operate the TEMP.
the remote control display shows
flashing of the operation lamp. If the opera-
tion lamp is flashing, it shows the protection
circuits for connecting cable is working or
thermal fuse is blown.
e) In the same way, operate the TEMP.
key so that the display is increased one by
one to continue checks by the self-diagnosis
as shown in the next table. From
check operations of protection circuits
for each block, and
operations of the typical protection circuits.
Indication after operation
key and make sure
and
up to
to check