Sony RM-450 - Page 14

{M-450/RM-450CE
6) Press @ [EJECT].
‘44-" and “232c” appear on the left and right
displays respectively.
Again
press
the
@
key,
“Error”
must
appear
on
the
right
display.
(At
this
time
,
if
pins
@,@ of
CN207
on
CPU-3
board
are disconnected,
then
shorted
instead,
“OH”
is displayed.)
7) Press the @ twice.
“66-+*" appears on the left display. “OH” must appear on the right display.
3-2. Backup function check in keyboard
1)
Turn
OFF
the
POWER.
switch,
:
2) Turn ON the POWER switch while pressing @ |LEARN
and © at the same time,
3) Turn OFF the POWER switch,
4)
About
5
minutes
past,
turn
ON
the
POWER
switch
while
Neeeeeeee
”
and
“XXXKXXXXX”
must
appear
on
pressing
@
[LEARN]
and
©
keys
at
the same time,
the left
and
right
displays
respectively.
3-3.
Bottom
case
check
(available
only
when
7-segment
display
is
active)
3-3-1, Preparation
1) Remove the keyboard,
. Insert the 8-bit DIP switch (J-4, 1-570-623-11)
into the IC socket labelled S202 (CHECKER)
on the CPU board,
(Remove this switch after checking.)
(3)
Turn
ON
7
bits
on
the
left
side
and
turn
OFF
1
bit
on
the
right
side,
(4) Mount the connectors J-1, J-2, and J-3 of the
service tools.
(5) Connect the VIDEO signal to the REF.
VIDEO IN terminal,
(6) Install the keyboard,
(
(2
8-3-2, Procedure
(1) Turn ON the POWER switch while pressing “450” and “XX-X” must appear on the left
@® in Fig. 1 and @ in Fig, 2 at the and right displays respectively. :
same time, Ql, 02, ++ 18 must appear sequentially on the
(2) Press @ in Fig. 2, left display, then, “-------- "and “-------- i
appear on both displays finally, followed by
beeps, :
(8) Remove the DIP switch from $202.
3-3-8, Fault identification
If a fault is found, operation is stopped immediately,
Display example for faulty place:
Left display: 07 Right display: 01 01
4 J J
STEP Error No, Error code
in STEP
To confirm whether additional error codes are present in the same step, press @ |STDBY| key in Flg, 2,
Unchanged error No. in the step indicates there is no additional error in the step.
To proceed to the next step, press @ [EJECT] key in Fig.2,
For the meaning of error code, see the Error Code List,
4-5 (E)