Marantz MAR770 Electrical service diagnostics, Software versions, test for defective components

6.3Electrical service diagnostics

ELECTRICAL SERVICE DIAGNOSTICS

(software versions, test for defective components)

If power ON,

switch power OFF

Load CD-DA disc (SBC444A)

Press <PLAY> + <F FWD> simultaneously and switch ON unit

PLAYER

INFORMATION

Display :

"PLAYER ID"

"SW VERSION BACK END" "SW VERSION CDR LOADER"

(CDR775 "SW VERSION CD LOADER")

CDR MAIN

LOADER TESTS

ABORT TEST	CDR LOADER TEST
	CD-DA disc must be loaded
	Display shows current disc time

BOARD TEST

Display : "DTST1"	ABORT TEST
DRAM test (7702)
PASS OR FAIL		Press <F FWD>
Display : "DTST2"
	ABORT TEST
FLASH CHECKSUM test (7702)
PASS OR FAIL
		Press <F FWD>
Display : "DTST3"
FLASH ERASE test (7702)

Press <F FWD>

ABORT TEST

	NO	Display :		"BERR1"
Test OK?		or		"NO CDDA"
		or		"NO DISC"
YES
			Press <F FWD>
CD LOADER TEST *
CD-DA disc must be loaded
Display shows current disc time
	* FOR CDR775 ONLY

PASS OR FAIL
Display : "DTST4"
CODEC test (7702)			ABORT TEST
PASS OR FAIL
					Press <F FWD>
Display : "DTST5"
CDR LOADER			ABORT TEST
COMMUNICATION test
PASS OR FAIL
					Press <F FWD>
Display : "DTST6" *
CD LOADER			ABORT TEST
COMMUNICATION test
PASS OR FAIL	* FOR CDR775 ONLY
					Press <F FWD>
	NO
Tests OK?		Display :		"DERRn"
YES		n = failed test
			Display next
			failed test

	NO	Display :	"BERR2"
Press <F FWD>	Test OK?	or	"NO CDDA"
	YES	or	"NO DISC"

DISPLAY TEST

Press <F FWD>

DISPLAY TEST

Display segments blink at f=1kHz

KEYBOARD &	Press <F FWD>
RC TEST

KEYBOARD & RC TEST

Display shows name of pressed keys

To end test, switch OFF unit

CL 96532086_025.eps 080999

Figure 6-2

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