— 39 —
Q110
Q110
Q129
IC115
Q128
IC117
L106
Q123
CR2032
VIN
EXT
VOUT
IC108
D103
L103
Q108
SHDN
EXT
CS
V+
MAX608 (IC106)
Primary Circuit
V3SYS
V3RAM
VSUB
V3ROM
(To ROM)
ONSTATUSB
OFF: H
ON: L
V3IRDA
(To IrDA)
PIRB
(Normally H)
3.4 V Regulator
PDMMYM
(Normally L)
Q122
Q121
Q112
V3MAIN
PRECB
V3REC
DC-DC converter
IVR2430
VSS
LH
OUT
3 V Circuit
DC/DC converter MAX608ESA (IC106) gen3.77 V and it makes up 3 V system.
V3MAIN :
The reference voltage for the detector.
V3SYS :
+3.4 V source for IC1,IC3,IC5.
V3RAM :
+3.4 V source for DRAM (RAM5 ~ RAM8).
V3ROM :
+3.4 V source for ROM (U301,U302).
ONSTATUSB :
Controls ON/OFF of V3ROM. From pin 99 of CPU.
V3IRDA :
+3.4 V source for IrDA Transceiver CIM-10S (IC4).
PIRB :
Controls ON/OFF of V3IRDA. From pin 75 of MB87A915 (IC3).
VSUB :
+2.7 V source for detecting memory backup battery.
V3AUD :
+3.4 V source for MB87A195 (IC3).
PDMMYM :
Controls ON/OFF of the load at detecting voltage.
Содержание PA-2400U
Страница 1: ...Handheld Personal Computer PA 2400U PX 686 R MAR 1998 without price PA 2400U ...
Страница 25: ... 22 7 Restoring starts 8 Click OK ...
Страница 77: ... 74 P668 MROM MASK ROM for OS for dictionary ...
Страница 78: ... 75 from MAIN PCB P686 LED LED ...
Страница 79: ... 76 from MAIN PCB from MAIN PCB P686 PWKEY POWER KEY P686 2KEY EL CALB KEY ...
Страница 80: ... 77 from MAIN PCB from MAIN PCB P686 ADP AC ADAPTOR P686 3PIN 3PIN I F ...
Страница 81: ...CASIO TECHNO CO LTD Overseas Service Division 8 11 10 Nishi Shinjuku Shinjuku ku Tokyo 160 0023 Japan ...