SONY BKP-7933
Manual de Servicio

1-3. Self Diagnostics

6. The switches S2 and S4 can be diagnosed as follows. (1) Press the [Return] key once and confirm that the following message appears on display. Then set the switches S2 and S4 as shown below.
BKP-7933 IF-689 Board Check START !! S-BUS COMMUNICATION SYSTEM -----------------------M27C4002(IC6,7 EPROM) ----------------------------STK12C60-S45(IC501,502,503,504 NVRAM) ------------CY7C109-20VC(IC8,9,10,11 SRAM) -------------------HN58257AT(IC28,29,30,31 EEPROM) ------------------IDT7133/7144SA55J(IC301,302 D.P.RAM) Rport ---------------------------------------------------------UPD71055 (IC42,43 PIO) MODE SW CHECK-A(S2,S4) ----OK OK OK OK OK OK **

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(2) (3)

Pressing the [Return] key again starts diagnostics, and the result is displayed. Press the [Return] key once and confirm that the message �MODE SW CHECK-B (S2, S4)� appears on display. Then set the switches S2 and S4 as shown below.

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(4) Pressing the [Return] key again starts diagnostics, and the result is displayed. 7. The switch S12 can be diagnosed as follows. (1) Confirm that the message �S-BUS NO CHECK-A (S12)� appears. Set the switches in the same manner as step 6 -(1) and execute diagnostics. (2) Confirm that the message �S-BUS NO CHECK-B (S12)� appears. Set the switches in the same manner as step 6 -(3) and execute diagnostics. 8. The switch S3 can be diagnosed as follows. (1) Press the [Return] key once and confirm that the message �CNU GP NO CHECK-A (S3)� appears on display. Then set the switch S3 as shown below. S3 (CNU GP No) � 0 (2) Pressing the [Return] key again starts diagnostics, and the result is displayed. (3) Press the [Return] key once and confirm that the message �CNU GP NO CHECK-B (S3)� appears on display. Then set the switch S3 as shown below. S3 (CNU GP No) � F (4) Pressing the [Return] key again starts diagnostics, and the result is displayed.

1-4 (E)

BKP-7933