Apple MB770 Service Manual download pdf (Page 126)

45641001TH Rev.1

5-43 /

Oki Data CONFIDENTIAL

5.3.6 Circuit related service call

[F090] SRAM abnormality on the SYS board

Classiﬁcation Contents

Circuit related service call SRAM abnormality on the SYS board

Check item Measure

SRAM Check the connection of SRAM

1. TurnthepowerOFF,andstartuptheSettingMode(08).

2. When“SRAMREQUIRESINITIALIZATION”isdisplayedonthe

LCD,checkthedestinationandthenpressthe[START]button.Ifthe

destinationisnotcorrect,keyinthecorrectoneandthenpressthe

[START] button. (SRAM is initialized.)

3. Aftertheconrmationmessageisdisplayed,pressthe[INTERRUPT]

button.

4. Performthepanelcalibration(08-9050).

5. Entertheserialnumber(08-9601).Matchitwiththeserialnumberon

thelabelattachedtotherearcoveroftheequipment.

6. InitializetheNICinformation(08-9083).

7. TurnthepowerOFFandthenstartupwiththeAdjustmentmode(05).

8. Perform“Automaticgammaadjustment”<PPC>(05-7869).(using[4]

[FAX]testpattern)

9. Perform“Automaticgammaadjustment”<PRT>(05-8008,8009).

(using[70][FAX]testpattern)

10. Turn the power OFF and then back ON.

SYS board Board check

Replacement part Messure

SRAM on the SYS board

SYS board

[F400] SYS board abnormality

Classiﬁcation Contents

Circuit related service call SYS board abnormality

Check item Measures

SYS board Board check

Replacement part Measure

SYS board

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Apple MB770 Service Manual Page 126