Sony RM-AV2000T, Service Manual

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SECTION 3

TEST MODE

TEST Mode (Operation Check)

Preform the following operation checks using the TEST Mode before
starting the repair works.

1. All Keys Operation Check

Connection Method :

1) While pressing the  P  key and the   

Á

  + k e y ,

ture ON the main power of the regulated power supply (DC
+6V). (Refer to Fig. 1-1.)

2) Remove all hands from pressing the all keys described in above

step 1). The all indications of the LCD must be turned OFF.
(Refer to Fig. 1-2.)

3) When  any  key  of  the  Operation  panel-key  block  (except

the  COMMANDER OFF  key), or any key of the LCD touch-
key block is pressed, the signal (carrier 40kHz) as shown in
Fig. 1-3 must be transmitted in accordance the pressed key, when
operation of the machine is normal.

4) Press all keys of the Operation panel-key block (except the

COMMANDER OFF   key, and of the LCD touch-key block
sequentially. When all keys are pressed, confirm that the long
buzzar sound and all LCD displays are turned off.

NOTE

 : Be careful that all data in S-RAM is cleared

when the above TEST mode is performed.

•

This TEST Mode can be terminated in its middle before testing
all keys by pressing the   COMMANDER OFF   key. However
the conduction check of the remairing keys cannot be checked.
(S-RAM is not cleared.)

•

P-ROM (IC8) is diagnosed to be free from defects when the
steps from 1) to 4) are performed correctly.

+

–

Regulated power supply
(+6V constant voltage output)

set

+6V pin

LCD touch-key block

COMMANDER OFF

P

Á

 +

Operation
panel-key block

+

+

PROGRAM

Turn ON the
main power (DC 6V)

While pressing both keys
at the same time;

Á

2.4mscc

2.4mscc

2.4mscc

600 

µ

 sec

600 

µ

 sec

Fig. 1-1

Fig. 1-2

Fig. 1-3

(See Fig. 3-1.)