Yamaha DM 1000, Service Manual

Page: 117 / 307

DM1000/MB1000/SP1000
117
1-13. WORD CLOCK test
Contents: WORD CLOCK OUT
→
IN is counted by
PLLP2 and automatically checked (Fs =
44.1/48/88.2/96 kHz).
For the PLL LOCK check, Read the
UNLOCK signal and check when the clock
is stable after the FS change (after about
200 ms).
To confirm the UnLock, disconnect the
cable connected to WORD CLOCK IN and
check.
Preparation: Connect the IN to the WORD CLOCK OUT
of the unit with the BNC cable.
Example of execution screen
1-21. LCD test
Contents: Display the entire LCD screen in black and
white alternatively and visually check.
Example of execution screen
Check if the entire screen is displayed in black and white
respectively.
When the entire screen is displayed in black, check for
any dot flaws.
Check if the screen contrast changes when the contrast
volume is changed.
If the above is confirmed, press the [DEC] key and
select OK/NG.
Explanation of display when DSP6 and DSP7 are common
or NG
1-6. MIDI test
Contents: Send/Receive the character str ing
“SCI2:TEST¥n” (¥n = 0Ah) from/to MIDI
OUT
→
MIDI IN at 31.25 Kbps and check
that the sent and received strings are
identical.
Preparation: Connect the MIDI IN connector to the MIDI
OUT of the unit with a MIDI cable.
Example of execution screen
1-11. 2TR IN/OUT (DIO) test
Contents: Use the DSP SIO and check 2TR OUT
DIGITAL 1, 2
→
2TR IN DIGITAL 1, 2.
Preparation: Connect the 2TR IN DIGITAL 1,2 to the 2TR
OUT DIGITAL 1, 2 of the unit respectively.
Example of execution screen
EXIT ([DEC] Key->[ENTER] Key)
--- MIDI Loopback ---
OK MIDI Check
OK: SCI2
EXIT ([DEC] Key->[ENTER] Key)
--- 2TR IN/OUT ---
OK FS
OK OUT-->IN
OK DIR Lock (RERR)
OK DIT,DIR CDIN,CDOUT
NG: DIO_SIO 2TR1 [W:12485100 -> R:00000000]
1) CPU Interface (Data Bus) ...NG: IC201
0000 0000 XXXX 0000 0000 0000 0000 X00X
MSB X=Error bit LSB
2) SIO Connection (DSP7
→
DSP6) ...
NG: 1 IC201 S0[xx]
→
IC301 SI[xx]
IC number
EXIT ([DEC] Key->[ENTER] Key)
Good or bad
decision
--- LCD ---
OK Turn on LCD(white<-->black)
[ENTER] key to Start, [DEC] key to Stop
OK NG
EXIT ([DEC] Key->[ENTER] Key)
--- WORD CLOCK ---
OK OUT->IN
OK PLL (DIR2,DBL)
NG PLL UnLock
Disconnect BNC cable
NG:DBL_PLL_48K_COUNT=220
If this message is displayed,
disconnect the BNC cable
connected to the WORD
CLOCK IN and press the
[ENTER] key.
DSP6 test items DSP7 test items
1: CPU Interface (Data bus) 1: CPU Interface (Data Bus)
2: CPU Interface (Data bus) 2: CPU Interface (Chip Select)
3: CPU Interface (Chip Select, TXB) 3: CPU Interface (Address Bus)
4: CPU Interface (Address bus)4: E-RAM Interface (Data Bus)
5: CPU Interface (BUS W/R Reg.) 5: E-RAM Interface (Address Bus)
6: DRAM Interface (Data Bus) 6: SIO Connection (DSP7
→
DSP6)
7: DRAM Interface (Address Bus) 7: SIO Connection (DSP6
→
DSP7)
8: DRAM Interface (Address Bus & MPR) 8: SIO Connection (DSP7
→
DSP7)
9: SIO Connection 9: SIO Connection (ATSC
→
DSP7)
(DSP6
→
DSP6 SIO test) A: SIO Connection (DSP7
→
ATSC)