SONY RMAV2000T
Service Manual

SECTION 3 TEST MODE
TEST Mode (Operation Check)
Preform the following operation checks using the TEST Mode before starting the repair works.
LCD touch-key block COMMANDER OFF PROGRAM +
�+

1. All Keys Operation Check
Connection Method :
Regulated power supply (+6V constant voltage output)

+6V pin set

+ �

(See Fig. 3-1.) 1) While pressing the PROGRAM + key and the � + 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 touchkey 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.
Operation panel-key block

PROGRAM

�

+

+

While pressing both keys at the same time;

Turn ON the main power (DC 6V)

Fig. 1-1

�

Fig. 1-2

2.4mscc

2.4mscc

2.4mscc

600 µ sec

600 µ sec

Fig. 1-3

� 16 �