Sanyo KH2442 / CH2442 Service Manual page 180

Important
Never press
the procedure below only when erasing is necessary.
To erase accessed data, press the
When erasing is finished,"----" mark appears on the controller's display.
CAUTION
After checking the alarm messages, be sure to press the
(D) Check the remote controller itself for correct operation
The remote controller has a self-diagnostic function to check for problems in the remote
controller itself.
Section
In order to check, the shorting plug (2P) inserted in the socket (4P) on the back of the remote
controller circuit board should be moved from RCU.Main to RCU.CK. (Ref. Fig. IV-6)
1
NOTE
1) Be sure that the shorting plug is inserted onto RCU.Main during normal operation.
2) The remote controller self-diagnostic function can be run on a remote controller
independently if power of 9–16 VDC is supplied to plug 2P as shown in Figure IV-6.
(A 12- 1/4-W resistor must be placed in between.)
Checking serial communications
2
The remote controller's own serial communications sending and receiving circuits can be
checked by moving the shorting plug. The indicators will respond as follows for approximately
10 seconds, then turn off:
Correct : All indicators light up.
Incorrect : All indicators flash on and off.
Checking I/O circuits
3
After completing the serial communications check (for 10 seconds), operate each switch on
the remote controller. If the LCD display responds, then the remote controller is normal.
4
5
(clear) button unless you want to erase the accessed data in memory. Follow
12 •1/4W
DC9
~16V
RCU.Main
RCU.CK
RCU.Sub
RCU
TMNL.
button.
TIMER
TMNL.
RCU.ADR
Fig. IV-6
IV - 24
4. Service procedures
button.
D u r i n g n o r m a l
o p e r a t i o n
S h o r t i n g p l u g
i s m ove d .
D u r i n g s e l f -
d i a g n o s t i c c h e ck
2079_M_I
SM830082