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Great copy of the manual, has all information required for servicing,
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I work at an authorized service center and I can tell if a manual is as it should be. This one is. It may be a scan, but a very good one at that. The interesting part for me was the curcuit diagram which was scanned at high quality, making it as good as the original. I will definitely be back as a customer. I need not say this, but I will: the price was the best. Thank you owner-manuals.com .
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really a very good manual even sometimes the quality is no so good as before still very readible and very very useful!
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FAST very good and clear a great unexpensive job!!! very recomended for all people who are preofessional or hobbists as me!!!!!!
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Thank you very much for this Service Manual, it helped us a lot to repair the M-4318!
...BUT: The parts list is missing and the free parts katalog on web isn't complete, so now we don't know the part numbers of the defect parts :(
We had to build them out of a working machine, and need the numbers to reorder the missing parts now.
CPU (LSI1: MSM6521-13)
Containing a sound data ROM and a DAC (Digital to Analog Converter), the CPU provides sound waveform in accordance with the pressed key and selected tone. The CPU also drives LEDs in the illuminated keyboard directly. The following table shows the pin functions of LSI1.
Pin No. 1~7 8 9 10 ~ 13 14 ~ 17 18 19 20, 21 22 23 24 ~ 26 27 28 29 30 31 ~ 38 39 ~ 46 47 ~ 58 59 60
Terminal LY1 ~ LY7 LVDD1 LGND2 LX0 ~ LX3 LX4 ~ LX7 LVDD2 GND2 COSI, COSO VDD GND1 TEST1 ~ TEST3 RESET AVDD OUT AGND KI0 ~ KI7 KO0 ~ KO7 � LGND1 LY0
In/Out Out In In Out Out In In In/Out In In In In In Out In In Out � In In
Function Keyboard LED drive signal output +5 V source for the built-in LED driver Ground (0 V) source for the built-in LED driver Keyboard LED drive signal output Not used. +5 V source for the built-in LED driver Ground (0 V) source 21.725 MHz clock pulse input/output +5 V source Ground (0 V) source Not used. Connected to ground. Reset signal input. Power OFF: 0 V, Power ON: +5 V +5 V source for the built-in DAC Sound waveform output Ground (0 V) source for the built-in DAC Input terminal for keys and switches Key and switch scan signal input Not used. Ground (0 V) source for the built-in LED driver Keyboard LED drive signal output
C12
Filter Block
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.
AVDD
T2 2SC1740SQ R12 C9
R11 C10
R13
R14
C11
AG
AG
AG
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