ICD-MS1 (serv.man2) - Sony Audio Service Manual (repair manual). Page 9

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Fig. 2-3 shows the generated power voltages of this unit. 
The eight different power voltages are generated in the ICD-MS1 as described below. 
 
c UNREG 2.5 [V] voltage 

→ IC522, L521, Q522, IC561, L561 

•  This is the voltage that is supplied from AC adapter and battery, and becomes VDD voltage when driving IC168 (POWER AMP). 

•  This voltage becomes the power source for the power voltages that are described in the following items 2 and 3. 

 
d VCC 3.5 [V] voltage

→ +3.5[V] generated by IC522, L521 and Q522. 

•  This voltage becomes the power source for the power voltages that are described in the following items 4 and 5. 

e VCC 4.0 [V] voltage 

→ +4.0[V] generated by IC561 and L561. 

•  This voltage becomes the power source for the power voltages that are described in the following items 6 to 8. 

 
f SYS_VCC 3.3 [V] voltage 

→ IC524 

•  This is the +3.3 [V] power voltage for driving the system controller IC722, timer (REAL TIME CLOCK) and others. 

•  This power voltage drives the LCD together with the +3.0 [V] power voltage after it has passed through IC728. 

 
g MS_VCC 3.3 [V] voltage 

→ IC523 

•  This is the power voltage that is supplied to the Memory Stick, and is +3.3 [V]. 

 
h PCM_VCC 3.3 [V] 

→ IC562 

•  This is the power voltage that drives ADPCM IC164, and is +3.3 [V]. 

 
i MIC_VCC 3.3 [V] voltage 

→ IC563 

•  This is the power voltage that is used in microphone amplifier IC161, AGC IC162, and the VOR detection circuit. This is the +3.3 [V] power voltage. 

 
j DIVID_VCC 3.5 [V] voltage 

→ IC564 

•  This is the power voltage that is used in DIVIDER IC165, and is +3.5 [V].