Dm Atsc2 Test; Ca Atsc2 Test; Midi Test; Rs 232C/422 Test - Yamaha DME24N Service Manual

DME24N/DME64N
(2) Display Screen at NG
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06. CA DSP7
[DIAGNOSTICS FOR DSP7]
＞ CPU I/F (DATA BUS)...NG !
DSP7-7
X X X X X X X X X X X X X X X X
＞ CPU I/F (ADR BUS)...NG !
DSP7-7
X X X X X X X O
＞ CPU I/F (CHIP SEL)...NG !
X : abnormal bit
O : normal Bit
Fig. 19. CA DSP7 Test Screen (2)
Scroll display at NG is the same as in "1-4. DSP6" and
"1-5. DM DSP7".

1-7. DM ATSC2 Test

1-8. CA ATSC2 Test

Content: Writes, reads, and displays each register of
ATSC2.
Checking targets are as follows for specific sheets and
models.
Circuit
ATSC2No.
Board
ATSC2#1 (IC202)
ATSC2#2 (IC203)
DSP
ATSC2#3 (IC302)
ATSC2#4 (IC303)
ATSC2#1 (IC404)
ATSC2#2 (IC405)
CA
ATSC2#3 (IC502)
LCD screen
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07. DM ATSC2
DSP ATSC2 #1 : OK!
DSP ATSC2 #2 : OK!
DSP ATSC2 #3 : OK!
DSP ATSC2 #4 : OK!
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07. DM ATSC2
CA ATSC2 #1 : NG!
MODE REG. NG
adrs: 0x00 W: 0x00 R:0x0F
CA ATSC2 #2 : NG!
OUT TDIF CH STS REG. NG
adrs: 0xA8 W: 0x20 R:0x0F
Fig. 20. DM ATSC2 Test Screen
106
∗∗∗
DME24N DME64N
○ ○
− ○
○ ○
○ ○
− ○
− ○
− ○
∗∗∗
EXIT: [ENTER]
Indicated in case of O.K.
∗∗∗
Indicated in case of NG.
Detailed contents at NG are as follows:
· NG register name "MODE REG.NG"
· NG address W/R data "adrs: 0x00 W:0x00 R:0x0F
When the results are not displayed in one screen, the
display scrolls. Use the encoder to scroll the test results
and check for normality.
When NG, a register name and its port address where
NG was detected first are displayed along with the W/
R data contents.

1-9. MIDI Test

Content: Transmits and receives data "DDh, 33h, 55h
and CCh" from MIDI OUT → MIDI IN at 31.25 Kbps
and checks for identity.
Connect MIDI OUT and the MIDI IN connectors of the
main unit with a general-purpose MIDI cable.
LCD Screen
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09. MIDI
OK !
NG: DATA ERROR. !
EXIT: [CANCEL]
Fig. 21. MIDI Test Screen
Messages
· Data disagreement error: NG: DATA ERROR.!

1-10. RS 232C/422 Test

Content: Loops back the COM terminal, transmits and
receives data "DDh, 33h, 55h and CCh", and checks
for identity. The test is performed continuously in the
order of RS232C → RS422.
Setup: Connect a RS232C connector test jig (for loop
back) with the COM terminal of the main unit.
LCD screen
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10. RS232/422
RS232 OK !
RS422 OK !
NG: RS232 DATA ERROR !
NG: RS422 DATA ERROR !
EXIT: [ENTER]
Fig. 22. RS232C/422 Test Screens
Indicated in case of O.K.
∗∗∗
Indicated in case of NG.
Indicated in case of O.K.
∗∗∗
Indicated in case of NG.