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Marantz SR4021 Service Manual

Marantz SR4021
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2
2. SOFTWARE VERSION CHECK
A version of microprocessor is confirmed by the following.
1. Press the POWER ON/STANDBY button to turn on the unit.
2. Press MUTE and the SOURCEDIRECT buttons more than 3 seconds, while pressing the SLEEP button.
3. The front display shows “yymmdd-x” of software version for 4 seconds, while press those buttons.
REMARK : yy is two digits of year. mm is month. dd is date. x is version of release date.
INDICATION EXAMPLE : 060419-1
3. ABOUT REPLACE THE MICROPROCESSOR WITH A NEW ONE
When replaced of the U-PRO (Microprocessor) or the Flash ROM, confirm contents of the following.
PWB
Name
Pos.
No.
Description
After
replaced
Remark
FRONT IC91 TMP87PM78FG, SR4021 A OTP
After replaced
A : Mask ROM (With software). No need write-in of software to the microprocessor.
B : Flash ROM (With software). Usually, no need write-in of software. But, when the software was updated, you should be
write-in of the new software to the microprocessor or flash ROM. Please check the software version.
C : Empty Flash ROM (Without software). You should be write-in of the software to the microprocessor or flash ROM.
Refer to "Update procedure" or "writing procedure", when you should be write-in the software.

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Marantz SR4021 Specifications

General IconGeneral
BrandMarantz
ModelSR4021
CategoryReceiver
LanguageEnglish

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