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The manual is an excellent reproduction with complete schematics, made troubleshooting and repair a simple process.
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Up to now you are the BEST! Prompt-efficient and so reasonable ! I have been after SONY service manual for quite some time !Thank you very much ! I can recomend your service to
all my collegagues ! V.Bergfield .
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This is a very good quality print (scan) of the original SONY service manual. The original from Sony is on very thin paper. Nevertheless it is very clear and sharp and excellent readable. I'm very satisfied to have now this rare document. I've looking for it many years (infrequent). It contains very detailed circuit diagrams, exploded views, part lists, PCB view with good readable connection lines. Very recommended.
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A complete manual with all the needed details of calibrations and service instructions about the radio receiver.
A big deal.
Many thanks !
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Fast delivery and good quality copy. To be recommended
CPU (LSI1: MSM6755B-17)
The CPU reads sound data from the ROM in accordance with the pressed key and the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then it provides the left and the right channels� waveforms separately, by converting the data into the waveforms with two built-in DACs. The CPU also controls key and button input. The following table shows the pin functions of LSI1.
Pin No. 1 2, 3 4 ~ 19 13 17 20 ~ 27 28, 29 30 31 32, 33 34 35 36 37 38 39 40 41 42, 43 44 45 46 47 48 49 50 51 52 53 54 55, 56 57 58 ~ 64 65 66 ~ 73 Terminal MA14 NCO MA0 ~ MA13 MRDB MCSB MD0 ~ MD7 NC1, NC2 DGND DVCC XTLO, XTLI NC3 RSTB P24/RXD P25/TXD NMI APO NC4 REFH NC5, NC6 DAOR NC7 AVdac DAOL REFL AGdac AGadc ANI AVadc NC8 MOD0 MOD1, MOD2 P40 KI0/P30 ~ KI7/P36 KI7/P37 KO0/P50 ~ KO7/P57 In/Out Out � Out Out � In/Out � In In In/Out � In � � In Out � Out � Out � In Out Out In In In In � In In � In � Out Function Address bus Not used Address bus Read enable signal Not used Data bus Not used Ground (0 V) source +5 V source 20 MHz clock input/output Not used Reset signal input Not used. Connected to +5 V. Not used Power ON signal input. Connected to +5 V. APO (Auto Power Off) signal output Not used Terminal for the internal DAC Not used Right channel sound waveform output Not used +5 V source for the internal DAC Left channel sound waveform output Terminal for the internal DAC and ADC Ground source for internal DAC Ground source for internal ADC APO cancellation signal +5 V source for the internal ADC Not used Mode selection terminal. Connected to +5 V. Mode selection terminal. Connected to ground. Not used Terminals for key/button input signal Not used Terminals for key scan signal
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