SONY RM-450A
Service Manual

3-3-1. Keyboard Check
1) Turn power ON while pressing the 2 LEARN key in Fig. 1 and the 7 ASMBL key in Fig. 2 at the same time. 2) Press the !] EJECT key. 3) Again press the !] EJECT key, and �11�� appears on the left 7-segment display. Press keys in the order of 1, 2, 3�#\ and #;. When mistake the operation, press keys in the order of 1, 2, 3�#\ and #; again. 4) Press the !] EJECT key. �22�� appears on the left 7-segment display while �P1 on� appears on the right 7-segment display. (1) Place all indoor switches #' to $= in Fig. 1 in upper position, and press the !] EJECT key. If a fault is found, �Error� is displayed. In this case, press the ![ STDBY key, then the number of error switch is displayed. If many error exist, the number of next error switch is displayed whenever press the ![ STDBY key. For switch number, refer to the following.
1
PLAYER
TC RTC CTL

All LEDs must come on.

All LEDs must go off.

01, 02�35, 0H must appear on the right 7-segment display. No error display allowed.

�P1_ _ _ _0H� must appear on the right 7-segment display. No error display allowed.

3
PREROLL
7 5 3

4
SYNCHRO
ON/CF ON OFF

6
RECORDER
TC RTC CTL

LEARN
7 6 5 4 3

SYSTEM PRESET
2 1 0

ON OFF

7

6

5

4

3

2

1

0

7

8 . . . . . 13 14 15 16 . . . . . 21 22

(2) Place the above switches in lower position, and press the !] EJECT key twice. (3) Place #', #,, #. and $/ switches in Fig. 1 in center position, and press the !] EJECT key twice. 5) Press the !] EJECT key. �33�� appears on the left 7-segment display. (1) Set both search dials to SHUTTLE. Place both search dials in the center position. (2) Check that left search dial display varies as shown to the right when turning left search dial clockwise. Check that display as shown to the right is obtained at fully clockwise rotation. The same change must appear also in counterclockwise rotation. (3) Check that turning of right search dial provides the same display change as left search dial. 3-4 (E)

�P2_Error� must appear on the right 7-segment display. Press the ![ STDBY key. � �P201_ _02� must appear. Press the ![ STDBY key. � �P202_ _05� must appear. Press the ![ STDBY key. � �P201_ _02� must appear. �P3_ _ _ _0H� must appear on the right 7-segment display.

The right 7-segment display must indicate �0000 0000�. (Left half for left search dial, and right half for right search dial.) 0000 � 0001 � 0010 � 0011 � 0100 � 0101 � 0110 � 0111 � 1000

RM-450A