Sony ICD-MS1 (serv.man2) Service Manual ▷ View online
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13
Supplying Power during WAKE UP Mode
The WAKE UP mode means the status that the main POWER switch is turned on when using the unit that is equipped with the POWER switch so that the unit can be operated.
1. During the WAKE UP mode, the system controller IC722 outputs the "H" signal from pin-41 [S POWER]. This signal sets all of the CE (Chip Enable) signal at pin-3 [CE] of
the DC-DC converter IC561, pin-3 [CE] of the +3.3 [V] REG IC562 and pin-3 [CE] of the +3.5 [V] REG IC564 to the "H" signal.
2. By the operation of the DC-DC converter IC561, the VCC 4.0 [V] is output to the cathode of the diode D561. This voltage is input to pin-2 [VIN] of the +3.3 [V] REG IC562
and pin-2 [VIN] of the +3.5 [V] REG IC564 so that the voltage output from pin-5 [VOUT] is sent to the ADPCM IC164 and DIVIDER IC165, respectively.
3. The VCC 4.0 [V] from the DC-DC converter IC561 is supplied to pin-2 [VIN] of the +3.3 [V] REG IC563, too. When the unit is in the recording mode, the system controller
IC722 outputs the "H" signal from pin-38 [MIC POW]. This output is input to pin-3 [CE] of the +3.3 [V] REG IC563 so that the MIC_VCC 3.3 [V] is output from pin-5 [V OUT]
of the REG IC563. The MIC_VCC 3.3 [V] is supplied to the AGC IC162, MIC AMP IC161 and VOR IC163 that are used as their power supplies.
of the REG IC563. The MIC_VCC 3.3 [V] is supplied to the AGC IC162, MIC AMP IC161 and VOR IC163 that are used as their power supplies.
41
38
3
4
2
2
5
3
2
5
3
2
5
3
IC722
SYSTEM
CONTROLLER
SYSTEM
CONTROLLER
UN REG 2.5[V]
(WAKE UP:H SLEEP:L)
(REC:H PB:L)
S. POWER
MIC POW
L561
D561
VOUT
LX
CE
VCC_4.0[V]
IC561 4V STEP-UP
DC-DC
CONVERTER
VIN
VIN
VIN
VOUT
IC563
+3.3V REG
+3.3V REG
VOUT
IC562
+3.3V REG
+3.3V REG
VOUT
IC564
+3.5V REG
+3.5V REG
DIVID_VCC 3.5[V]
PCM_VCC 3.3[V]
MIC_VCC 3.3[V]
CE
CE
CE
Fig. 2-6 Supplying power during WAKE UP mode
Supplying Power during SLEEP Mode
The SLEEP mode means the status that the unit has stopped its operations for saving power except for the required minimum functions.
1. If no operations are executed for three seconds or more while the unit is being stopped, the various information such as folder in use, recording mode, and others are stored
1. If no operations are executed for three seconds or more while the unit is being stopped, the various information such as folder in use, recording mode, and others are stored
in the RAM inside the system controller IC722, and the data such as memory/remaining amount of the battery, folder in use, recording mode, and others are displayed on
the LCD, and then the unit enters the SLEEP mode.
the LCD, and then the unit enters the SLEEP mode.
2. During the SLEEP mode, pin-41 [S POWER] of the system controller IC722 goes "L" so that the respective CE (Chip Enable) inputs such as pin-3 [CE] of the DC-DC
converter IC561, pin-3 [CE] of the +3.3 [V] REG IC562 and pin-3 [CE] of the +3.5 [V] REG IC564 that are connected to pin-41 [S POWER] of the system controller IC722, go
"L". All circuits that are operating on this power, stop all of the operations.
"L". All circuits that are operating on this power, stop all of the operations.
3. Because the VCC 4.0 [V] power supply from the DC-DC converter IC561 is stopped, the power to all circuits is stopped except for the timer (RTC) IC721 and system
controller IC722. At the same time, the system controller IC722 also stops its operations except for the power that is only supplied to a part of circuits to save power.
(Note : At this time, the crystal oscillator X721 also stops oscillation.)
(Note : At this time, the crystal oscillator X721 also stops oscillation.)
4. Furthermore, when the HOLD switch S761 is set to ON (HOLD), the message "HOLD" flashes on the LCD. After about three seconds, the LCD display is turned off and the
unit enters the SLEEP mode. Note that this unit enters the SLEEP MODE even when it is operated on AC adapter except while the unit is operating.
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14
Technical Tip
= Wake-up Mode and Sleep Mode =
This unit has the following three modes in the battery operation and the AC-adapter operation.
1. Wake-up Mode 2. Sleep Mode-1 (LCD “ON” sleep mode) 3. Sleep Mode-2 (LCD “OFF” sleep mode)
HOLD switch : OFF HOLD switch : ON
In the both sleep modes, only crystal inside TIMER IC721 is oscillating. X721 (3.7706MHz) connected to the System Controller IC722 is not
oscillating.
* During sleep mode-1, LCD module keeps displaying the above data before entering the sleep mode-1.
No display
The last information
is indicated.
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15
Transition from SLEEP Mode to WAKE UP Mode
When any operation is executed while the unit is in the SLEEP mode, the unit enters the WAKE UP mode by the system controller IC722 in accordance with the performed
operation.
1. The wake up detection is performed by Q721 and Q725. Q721 detects wake up when any of the function switches is operated. Q725 detects wake up at the events such as
operation.
1. The wake up detection is performed by Q721 and Q725. Q721 detects wake up when any of the function switches is operated. Q725 detects wake up at the events such as
when the Memory Stick is removed or inserted, the "HOLD" switch is turned ON/OFF, the external power supply is connected, and the TIMER (RTC) is operated. When any
operation is performed, pulse is output because Q721 or Q725 is turned "ON" momentarily.
operation is performed, pulse is output because Q721 or Q725 is turned "ON" momentarily.
2. The output pulse from the wake up detection circuit Q721 and Q725 is sent to pin-120 [WAKE UP] of the system controller IC722. When this signal is input, the "H" signal is
output from pin-41 [SPOWER] of the system controller IC722. Since the CE (Chip Enable) inputs of the power supplies IC561, IC562 and IC564 go "H" as they are
connected to the CE terminal, the power is supplied to each block of this unit so that the unit enters the wake up mode and starts the functions corresponding to the
operation. After the unit has entered the wake up mode, the system controller IC722 outputs the "H" signal from pin-31 [WAKE MSK2] and pin-32 [WAKE MSK1], and does
not accept the input pulse from the wake up detection circuit by masking it.
connected to the CE terminal, the power is supplied to each block of this unit so that the unit enters the wake up mode and starts the functions corresponding to the
operation. After the unit has entered the wake up mode, the system controller IC722 outputs the "H" signal from pin-31 [WAKE MSK2] and pin-32 [WAKE MSK1], and does
not accept the input pulse from the wake up detection circuit by masking it.
151
32
31
41
35 37
120
139
167 170
MS-EJ
S7
R763
R704
C724
C756
Q723
D722
R732
D723
Q725
Q721
R729
R726 R727
R730
R730
R764 R766
R767 R769
R702
R702
R744 R747
SYS_VCC 3.3[V]
TO
IC561
IC562
IC564
IC561
IC562
IC564
S POWER
SLEEP : L
WAKEUP : H
TO
RTC
HOLD
RTC
HOLD
WAKE
UP
UP
WAKE
MSK1
MSK1
WAKE
MSK2
MSK2
IC722
SYSTEM CONTROLLER
KEY
CTL
CTL
KEY
IN
IN
KEY
PUB
PUB
MS EJ
S1 S5, S721 S723, S725
RB721
[RTC INT]
[HOLD /XHOLD]
[HOLD /XHOLD]
Detection of Memory Stick
Function (Operation key) switch
CE (Chip Enable)
External power supply [XDCIN]
After WAKE UP, the "H"
signal is output.
signal is output.
In the practical circuit,
the key matrix is
constituted by resistors
and switches that are
connected to these pins.
the key matrix is
constituted by resistors
and switches that are
connected to these pins.
Fig. 2-7 WAKE UP detection circuit
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16
Key Matrix
The matrix that is constituted by the key-in/key control terminals of the system controller IC722, is shown in the following table.
2-5. Reset Circuit
1
121
72
15
87
6
76
3
SYS_VCC
3.3V
IC726
RESET SIGNAL GENERATOR
VIN
VOUT
IC722
SYSTEM CONTROLLER
XRST
XD PDN
XLCD RST
EP RST
IC164
ADPCM
PDN
IC723
EEP ROM
LCD720
LCD MODULE
RESET
RST
RESET
Fig. 2-8 Reset circuit
Fig. 2-8 shows the reset circuit.
As shown in the Fig. 2-8, when the SYS_VCC 3.3 V is input to pin-3 [VIN] of the RESET IC726 from the IC524, the reset release signal "H" is output from pin-1 [VOUT] and the
system reset is activated as the potential of pin-121 [XRST] of the system controller IC722 is changed from "L" to "H". Then the system controller IC722 outputs the reset
release signal "H" from pin-76 [XLCD RST] and pin-87 [EP RST] to pin-22 [RST] of the LCD720 and pin-6 [RESET] of the EEP ROM IC723. At the same time, the system
controller IC722 outputs the "H" signal from pin-72 [XD PDN] that is sent to pin-15 [PDN] of the ADPCM IC164 that resets ADPCM IC164.
C T L
I N
KEY CTL 0
(IC722 37 Pin)
KEY CTL 1
(IC722 36 Pin)
KEY CTL 2
(IC722 35 Pin)
KEY IN 0 (IC722 170 Pin)
S5 Erase
S6 Folder
S725 JOG (Play/Stop) (Enter)
KEY IN 1 (IC722 169 Pin)
S3 Menu
S4 Index
S725 JOG (Cue)
KEY IN 2 (IC722 168 Pin)
S2 Display
S723 A-B Repeat/Priority
S725 JOG (Review)
KEY IN 3 (IC722 167 Pin)
S1 Stop
S722 Record/Stop
S721 Pause
Contents
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