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There are currently no product reviews.
 ;
factory technician level - complete with board views :
( removing chassis from cabinet , only thing missing ) ;
on weekends , staff is not available so - be patient .
;
Good complete Service-Manual (SONY PVM6041QM)
A few graphics and waveforms not very clear! (-1*)
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Excellent manual. In addition to the information I needed was a complete description of both electronic and mechanical devices.
Excellent site.
Thank you very much.
;
very good and complete manual , it is in english and german is perfect for repair.
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This manual is complete and of high quality. I am very pleased with the purchase.
CPU (LSI101: MSM6387-22)
Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound waveform in accodance with the pressed key and the selected tone. The following table shows the pin functions of LSI101.
Pin No. 1, 2 3 4 5 6 7 8 9 10 11 ~ 18 19, 20 21 ~ 30 Terminal TEST1, TEST2 RESET AVDD OUT AGND GND COSI COSO VDD KI0 ~ KI7 KO11, KO10 KO9 ~ KO0 Out In In Out In In In � In In In/ Out Function Not used. Connected to ground. Power ON reset terminal. On: +5 V +5 V sorce for the built-in DAC Sound waveform output Ground (0 V) source for the built-in DAC Ground (0 V) source 21.725 MHz clock pulse input Not used +5 V source Input terminals from keys and switches Not used. Key and switch scan signal outputs Off: 0 V
Filter Block
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.
AVDD Q101 2SC1740SQ R2106 C106 C108
R107
R108
R105
From CPU
C109
AG
To power amp
R104
AG
C107
AG
Amplifier/Voltage Regulator (IC101: AN8053N)
The right figure shows the internal block of IC101.
VCC 16
NC 15
CONT 14
5V VREG 13
NC 12
NC 11
NC PRE GND 10 9
5V REG POWER
SP AMP + 1 SPO 2 NC 3 4 5 PC-2 6 SPI 7
VREF
8 VREF
SP GND PC-1
SPM
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