Read Sony ICD-MS1 (serv.man2) Service Manual online
NEW TECHNICAL THEORY
FOR SERVICING
ICD-MS1
OPERATION MANUAL
IC RECORDER
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TABLE OF CONTENTS
Section Title Page
1.
System Configuration..................................................................................... 3
1-1.
System Configuration .................................................................................... 3
1-2.
Microprocessor Interface............................................................................... 5
2.
Power Supply Circuit...................................................................................... 7
2-1.
Discriminating Power Supplies...................................................................... 7
2-2.
Over-discharge Protection Circuit ................................................................. 8
2-3.
Generated Power Voltages ........................................................................... 9
2-4.
Supplying Power and Controls in Each Block ..............................................11
♦
Supplying the Power to the System Controller IC and Timer (RTC) IC ...11
♦
Detection of Memory Stick and Supplying the Power............................. 12
♦
Supplying Power during WAKE UP Mode .............................................. 13
♦
Supplying Power during SLEEP Mode................................................... 13
♦
Transition from SLEEP Mode to WAKE UP Mode.................................. 15
♦
Key Matrix .............................................................................................. 16
2-5.
Reset Circuit................................................................................................ 16
3.
Signal Circuit................................................................................................. 17
3-1.
Operation during Recording ........................................................................ 17
3-2.
Operation during Playback .......................................................................... 19
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1. System Configuration
1-1. System Configuration
The system configuration of this unit is shown in Fig. 1-1.
Fig. 1-1 System configuration
MIC AMP
VOR DETECT
ADPCM
CODEC
CODEC
SYSTEM CONTROLLER
・ CONTROL OF ADPCM IC164
・ CONTROL OF POWER SUPPLY
・ CONTROL OF MEMORY STICK
・ LCD DRIVER
POWER AMP
MEMORY STICK
S RAM
MICROPHONE
LCD UNIT
EEP ROM
REAL TIME CLOCK
KEY & SW
RV161
IC161
IC163
IC164 IC168
IC723
IC721
IC722
IC727
AGC
IC162
SPEAKER / HP
Contents
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Signal flow during recording and playback, and the control by the system controller IC are briefly described based on Fig. 1-1.
Signal flow during recording is described as follows first. The audio signal input from the MICROPHONE INPUT is amplified by AMP IC161 and AGC IC162 and is input to
ADPCM IC164 where the input audio signal is converted to the ADPCM digital data by passing through the internal A/D converter, PCM compression circuit and ADPCM
encoder. The ADPCM digital data is output to the system controller IC722. The digital data receives the signal processing in the system controller IC722 and is saved in the
FLASH RAM area inside the MS (Memory Stick) through the connector CN723 of the MS insertion slot together with the data such as recording date, time, and others that are
output from the RTC (real time clock) IC721.
Signal flow during the playback is then described as follows. The audio data inside the Memory Stick are read by the system controller IC722, and are input to the ADPCM
IC164 through the system controller IC722. The digital data that are input to the ADPCM IC164, are output as analog signal through ADPCM decoder, PCM extension circuit,
LPF, and D/A converter. The output analog signals are input to the power amplifier IC168 through the sound volume VR161, and drives speakers or headphone. The data of the
recording date, time, and others can be displayed on the LCD in accordance with the display selection through the system controller.
Lastly, the system controller IC722 is described as follows. The system controller IC722 performs the entire system control and the following operation.
Signal flow during recording is described as follows first. The audio signal input from the MICROPHONE INPUT is amplified by AMP IC161 and AGC IC162 and is input to
ADPCM IC164 where the input audio signal is converted to the ADPCM digital data by passing through the internal A/D converter, PCM compression circuit and ADPCM
encoder. The ADPCM digital data is output to the system controller IC722. The digital data receives the signal processing in the system controller IC722 and is saved in the
FLASH RAM area inside the MS (Memory Stick) through the connector CN723 of the MS insertion slot together with the data such as recording date, time, and others that are
output from the RTC (real time clock) IC721.
Signal flow during the playback is then described as follows. The audio data inside the Memory Stick are read by the system controller IC722, and are input to the ADPCM
IC164 through the system controller IC722. The digital data that are input to the ADPCM IC164, are output as analog signal through ADPCM decoder, PCM extension circuit,
LPF, and D/A converter. The output analog signals are input to the power amplifier IC168 through the sound volume VR161, and drives speakers or headphone. The data of the
recording date, time, and others can be displayed on the LCD in accordance with the display selection through the system controller.
Lastly, the system controller IC722 is described as follows. The system controller IC722 performs the entire system control and the following operation.
The main controls and input administration are as follows.
Controlling ADPCM CODEC IC164 :
• Selecting mode (record/playback) of signal processing block
• Selecting sampling rate by recording mode (SP/LP)
• Selecting playback speed (fast/normal/slow)
Controlling Memory Stick :
Selecting mode of data recording/reading (record/playback))
Controlling POWER AMP IC168 :
• Selecting BTL/SE operation of record/playback mode
• Controlling muting circuit
Administrating key and switch :
• Input by each switch
• Selecting ON/OFF for setup by menu
Administrating clock information between system controller IC722 and RTC
IC721.
Driving the LCD
