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Excellent just what I needed to replace the electrolytic caps and make this old gem a beauty again. Was as scan of the original photocopied service manual.
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It was helpful to get schematic with waveforms in important points and lot of service information. Manual is good quality, fast delivered. Of course it is hardcopy of paper one with all its disadvantages.
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I want to give you a real heads-up for your desire to enable such people as I to acquire the information I need to maintain the older types of equipment such as this Akai HXA351W. You do a swell job with all the processes you have to perform so I can have a legible, thus usable
document which does not send me crazy trying to figure out the blurry text of a bad copy.
Very well done, Thomas.
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This manual is very well presented and after printing out looks about as close to an original as I think you can get. The quality is second to none.
The content of the manual is comprehensive and I think it would be well suited to an audio repair professional which I'm not but I did find it very informative and helpful.
The cost of the manual is more than covered by the money I'll save when I change the keep memory battery now I have the relavant info.
Very pleased with my purchase and can recommend it wholeheartedly as I can other manuals I've downloaded from this site.
Regards
Limey Alex
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Complete manual including mechanical part in good pdf quality. Shaded greys of the pcb due to pdf not perfect but usable.
DAC (IC11: UPD6376GS)
The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into analog waveforms by each channel and output them separately. The following table shows the pin functions of IC11.
Pin No. 1 2 3 4 5 6 7, 8 9 10 11 12 13 14 15 16
Terminal SEL D.GND NC DVDD A.GND R.OUT A.VDD R.REF L.REF L.OUT A.GND LRCK LRSEL SI CLK
In/Out In In � In In
Function Mode selection terminal. Connected to ground. Ground (0 V) source for the internal digit circuit Not used. +5 V source for the internal digital circuit Ground (0 V) source for the right channel Right channel sound waveform output +5 V source for the internal analog circuit Right channel reference voltage terminal Left channel reference voltage terminal Left channel sound waveform output Ground (0 V) source for the left channel Word clock input Not used. Connected to ground. Sound data input Bit clock input
KEY CONTROLLER (LSI16: HG52E35P)
The key controller generates key scan signals and provides them to the keyboard. By counting the time between first-key input signal FI and second-key SI from the keyboard, the key controller detects key velocity. The note number and its velocity data are read at regular intervals by the CPU.
RDAB LSI17 HG52E35P WRAB CLKA HGB
Key Controller LSI16 HG52E35P CRDB CWRB CKI CCSB RESB CD0 KC0 KC7 Key scan signal
~
Out In In In
Out In In In In In
Keyboard
KC
~
RESET Data bus
First contact FI0 SI0 Key input signal FI9 SI9 FI SI Second contact
CD7 Address bus CA0 ~ CA2
� 10 �
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