SHARP XEA202U, XE-A202 Service Manual

q SERVICE MANUAL

CODE : 00ZXEA202USME

ELECTRONIC

CASH REGISTER

MODEL XE-A202

(U and A version)

CONTENTS

CHAPTER 1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

CHAPTER 2. OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

CHAPTER 3. MASTER RESET AND PROGRAM RESET. . . . . . . . . 5

CHAPTER 4. HARDWARE DESCRIPTION . . . . . . . . . . . . . . . . . . . . 6

CHAPTER 5. TEST FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

CHAPTER 6. IPL (INITIAL PROGRAM LOADING) FUNCTION. . . . 15

CHAPTER 7. CAUTION TO BE USED WHEN

CONNECTING THE RS-232 CABLE . . . . . . . . . . . . . 16

CHAPTER 8. CIRCUIT DIAGRAM AND PWB LAYOUT . . . . . . . . . 17

Parts marked with "!" are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

	This document has been published to be used
SHARP CORPORATION	for after sales service only.
	The contents are subject to change without notice.

CHAPTER 1. SPECIFICATIONS

1. APPEARANCE

	Front view	Rear view
	Operator display	Customer display
		(Pop-up type)
	Printer cover
	Receipt paper
		Power cord
		Mode switch
		Keyboard
	Drawer lock	RS-232C connector
	Drawer
	Printer
	Take-up spool
		Paper roll cradle
	Print roller arm	Paper positioning guides
	Print roller
	release rever
	Inner cover

2. RATING

	XE-A202
Weight	16.3lb (7.4kg)
Dimensions	13.0 (W) x 16.9 (D) x 11.0 (H) inches
	(330 (W) x 428 (D) x 280 (H) mm)
Power source	AC 120V (m10%), 60Hz
Power consumption	Stand-by 7.7W, Operating 30W (max.)
Working temperature	0°C~40°C (32°F to 104°F)

3. KEYBOARD

1) KEYBOARD LAYOUT

Type	Normal keyboard
Key position	STD/MAX 53
Key pitch	19 (W) x 19 (H) mm
Key layout	Fixed type

2) KEY LIST

■Keyboard layout

	CONV	@/FOR	•	CL	PLU		DEPT		DEPT		CLK#		TAX	AUTO
					/SUB			#	SHIFT
						A		F		K		P	U	X
RA	%1	7	8	9		20		24		28		32	TAX1	TAX2
					4		8		12		16		SHIFT	SHIFT
						B		G		L		Q	V	Y
RCPT	%2	4	5	6		19		23		27		31	CHK	CH
/PO					3	C	7	H	11 M		15	R
–	NUMBER												W	Z
VOID RFND		1	2	3		18		22		26		30	MDSE	#/TM
					2		6		10		14
DC	SHIFT					D		I		N		S	SBTL	SBTL
ESC			0	00		17		21		25		29	CA/AT/NS
					1	E	5	J	9	O	13	T
BS	SPACE

Note: The small characters on the bottom or lower right in each key indicates functions or characters which can be used for character entries for text programming.

■Key names

KEY TOP	DESCRIPTION
2	Paper feed key
RA	Received-on account key
RCPT/PO	Receipt print/Paid-out key
VOID	Void key
ESC	Escape key
CONV	Conversion key
%1, %2	Percent 1and 2 key
RFND	Refund key
-	Discount key
@/FOR	Multiplication key
•	Decimal point key
CL	Clear key
0-9,00	Numeric Keys
PLU/SUB	PLU/Subdepartment key
DEPT#	Department code entry key
DEPT SHIFT	Department shift key
CLK#	Clerk code entry key
Dept1-32	Department keys
TAX	Tax key
Tax 1 SHIFT	Tax 1 shift key
Tax 2 SHIFT	Tax 2 shift key
AUTO	Automatic sequence key
CHK	Check key
CH	Charge key
MDSE SBTL	Merchandise subtotal key
#/TM/SBTL	Non-add code/Time display/Subtotal key
CA/AT/NS	Total/Amount tender/Non Sale key

4. MODE SWITCH

1) LAYOUT

• Rotary type

Manager key (MA)

MA

	OP		MA
	OPX/Z	REG
		MGR
	OFF	X1/Z1	Operator key (OP)
	VOID	X2/Z2
	PGM		OP

The mode switch can be operated by inserting one of the two supplied mode keys - manager (MA) and operator (OP) keys. These keys can be inserted or removed only in the “REG” or “OFF” position.

XE-A202U SPECIFICATIONS

– 1 –

The mode switch has these settings:

OFF: This mode locks all register operations. (AC power turns off.) No change occurs to register data.

OP X/Z: To take individual clerk X or Z reports, and to take flash reports.

It can be used to toggle receipt state “ON” and “OFF” by pressing he [RCPT/PO] key.

REG: For entering sales.

PGM: To program various items.

VOID: Enters into the void mode. This mode allows correction after finalizing a transaction.

MGR: For manager’s entries. The manager can use this mode for an override entry.

X1/Z1: To take the X/Z report for various daily totals.

X2/Z2: To take the X/Z report for periodic (weekly or monthly) consolidation.

5. DISPLAY

1) OPERATOR DISPLAY

Display device:	LED numeric display
Number of line:	1 line
Number of positions: 10 positions numeric display
Color of display:	Yellow / Green
Character form:	7 segment + DP
Character size:	Numeric 14.2 (H) x 7.9 (W) mm
Layout:
0 . 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 .
2) CUSTOMER DISPLAY
Display device:	LED
Number of line:	1 line
Number of positions: 7 positions
Color of display:	Yellow / Green
Style:	Pop up type
Character form:	7 segment + Dp
Character size:	14.2mm (H) x 7.9mm (W)

Layout:

3 . 4 . 5 . 6 . 7 . 8 . 9 .

Operator display							Customer display (Pop-up type)
	PLU/SUB
	DEPT REPEAT						Clerk code
	RCPT			DC			SHIFT NUMBER
	OFF

Amount: Appears in the far-right eight (max.) positions. When the amount is negative, the minus symbol “-” appears before the amount.

Number of repeats for repetitive registrations:

The number of repeats is displayed, starting at “2” and incremental with each repeat. When you have registered ten times, the display will show “0.” (2 3 3 ..... 9 3 0 3 1 3 2 ... )

Receipt function status:

The indicator “_” appears in the RCPT OFF position when the receipt function is in the OFF status.

Time: Appears in the far-right six positions (hour-minute - ”A” or hour-minute - ”P”) in the OP X/Z, REG, or MGR mode. “A” is displayed in the morning (AM), and “P” in the afternoon (PM). In the REG or MGR mode, press the [#/TM/SBTL] key to display the time.

■Machine state symbols

: Appears during programming.

: Appears when an error is detected.

: Appears when the subtotal is displayed or when the amount tendered is smaller than the sales amount.

: Appears when the [CONV] key is pressed to calculate a subtotal in foreign currency.

: Appears when a transaction is finalized by pressing the [CA/AT/ NS], [CHK] or [CH] key.

: Appears when the change due amount is displayed.

: May appear in the far-left three positions at the timing of key entry when the electronic journal (EJ) memory is full. (Depending on programming.)

: Appears when the voltage of the installed batteries is under the required level. You must replace with new ones within two days.

: Appears when the batteries are not installed, or the installed batteries are dead. You must replace with new ones immediately.

: May appear right below the eighth and ninth places at the timing of finalization of a transaction when the electronic journal (EJ) memory is nearly full.

Also appears right below the tenth place when power save mode is effective.

: Appears when the print roller arm is not locked.

: Appears when the paper is not set or out.

XE-A202U SPECIFICATIONS

– 2 –

Segment

	Display	Description
	position
Amount	1-8
Minus sign	2-10	-: Floating
Error	8-10	Exx:xx = error code
PGM Mode	10	P
CASH, CHECK,	10	F: Light up when a registration is
CHARGE		finalized by depressing CASH,
		CHECK, CHARGE key
S U B T O T AL /	10	o
short tender
Change	10	C: Light up whenever the change
		due amount appears in the display.
Currency	10	c: Light up whenever the foreign
Conversion		amount appears in the display.
Department	9-10	No zero-suppressed
PLU	7-10	No zero-suppressed
Repeat	8	Endless count, starting from 2.
Receipt OFF	9	_
DC		_: Double size character entry status
SHIFT		_: Shift character entry status
NUMBER		_: Number character entry status
Clerk No.	2, 3	-xx-: clerk number
EJ FULL	8-10	E-E: Light up when EJ memory is
		FULL at the timing of key entry (by
		PGM selection).
Low Battery	10	L:
No Battery	10	L:

Decimal Point

	Display	Description
	position
Decimal point	7-1
TAB	4-1
EJ near full	8, 9	(by PGM selection)

6. PRINTER

1) Printer

• Part number	: M-T53II
• NO. of station	: 1 (Receipt or journal)
• Validation	: No.
• Printing system	: Line thermal
• No. of dot	: 288 dots
• Dot pitch	: Horizontal	0.167mm
	Vertical	0.167mm
• Font	: 10 dots (W) u 24 dots (H)
• Printing capacity	: max. 24 characters/Line
• Character size	: 1.67mm (W) u 4.00mm (H) at 10 u 24 dots
• Print pitch	: Column distance		2.0mm
	Row distance		5.21mm
• Print speed	: Approximate 60mm/s (Approximate 12 l/s)

• Paper feed speed : Approximate 60mm/s (Approximate 12 l/s)

(Manual feed)	: Approximate 60mm/s (Approximate 12 l/s)
• Reliability	: Mechanism LIFE 6 million lines used to high-
	quality thermal paper
• Paper end sensor : Set up
• Cutter	: Manual Cutter
• Near end sensor	: No

2) Paper

•Paper rolldimension: 2.25 m 0.02 inch

57.5m 0.5mm in width

Max. 3.15 inch

Max. 80mm in diameter

• Paper quality:	High-quality thermal paper
	paper thickness:	0.06 to 0.08mm
	Nihon seisi thermal paper	TF50KS-E2C
	KANZAN thermal paper:	KF50
	KSP thermal paper:	P350

3) Logo stamp

• No

4) Printing area

Number of thermal head heater elements 288 dots

(4.75)	48 (288 dots)	(4.75)
	print area
	(max.24 characters)
	0.167
	57.5±0.5	(units : mm)
	(Paper dimension)

XE-A202U SPECIFICATIONS

– 3 –

7. DRAWER

[OUTLINE]

•Standard equipment: Yes (1)

•Max. number of additional drawers: 0

•The drawer consists of:

1)Drawer box (outer case) and drawer

2)Money case

3)Coin case

4)Lock (attached to the drawer)

[SPECIFICATION]

1) DRAWER BOX AND DRAWER

Version		U version		A version
Model name of		SJ415		SJ423
the drawer box
Size	(mm)	330(W) x 418(D) x 98(H)		420(W) x 426(D) x 114(H)
	(inch)	13(W) x 16.5(D) x 3.9(H)		16.5(W) x 16.8(D) x 4.5(H)
Material		Metal
Bell			—
Release lever		Standard equipment: situated at the bottom
Drawer open			—
sensor
Separation from			—
the main unit

2) MONEY CASE

Version	U version	A version
Separation from the drawer	Disallowed	Allowed
Separation of the bill compartments	Allowed	Allowed
from the coin compartments
Bill separator	—	Allowed
Number of compartments	4B/5C	5B/6C

Layout:

4B/5C (U version)

5B/6C (A version)

8. BATTERY

1) MEMORY BACK UP BATTERY

For memory back up, the dry battery AA (3 pieces) are needed.

1.Memory holding time:

Approx. 1 year after New dry batteries are installed.

2.Battery exchange method:

When the low battery symbol “L” lights up, replace the batteries (3 AA) by the following method;

1)Power on the ECR.

2)Mode switch turn to “REG” mode.

3)Remove the OLD dry batteries (3 pieces).

4)Insert the NEW dry batteries (3 pieces).

5)Confirm the low battery symbol “L” is off.

2)LOW BATTERY

Low battery indication will appear on the left side of display when the battery voltage is low.

CASE 1: When any numeric entry & any item entry is not done or just after finalization.

The machine can indicate the low battery condition. (Always)

CASE 2: When numeric entry or item entry is done.

Battery condition will not appear.

Exceptionally, when the power is restored after a power failure, the low battery condition will appear on the display only when the battery is low.

And the indicator will disappear after any key entry.

[Display sample]

“0.00”: Battery is OK.

“L 0.00”: Low battery (You have to change the batteries.)

“L 0.00”: No battery (You have to change the batteries immediately.)

After finalization

“F 12.34”: Battery is OK.

“L 12.34”: Low battery. (“L” indicate instead of “F”.)

“L 12.34”: No battery. (“L” indicate instead of “F”.)

Note: “NO BATTERY”: When the “NO BATTERY” is display, the master reset is executed at the timing of “POWER ON” after the “POWER OFF”.

3) LOCK (LOCK KEY : LKGIM7331BHZZ)

Location of the lock: Front

Method of locking and unlocking:

To lock, insert the drawer lock key into the lock and turn it 90 degrees counter clockwise.

To unlock, insert the drawer lock key and turn it 90 degrees clockwise.

Key No:	SK1-1
	SK1-1

L

k oc

un

l

k c o

XE-A202U SPECIFICATIONS

– 4 –

CHAPTER 2. OPTIONS

1.	OPTIONS (NO)
2.	SERVICE OPTIONS (NO)
3.	SUPPLIES
	NO	NAME	PARTS CODE	PRICE	DESCRIPTION
				RANK
	1	Thermal roll paper	TPAPR6656RC05	BA	5 ROLLS/PACK 70 φ

4. SPECIAL SERVICE TOOLS

NO	NAME	PARTS CODE	PRICE		DESCRIPTION
			RANK
1	RS-232 Loop-back connector	UKOG-6705RCZZ	BC
2	POS tools3 (IPL Software)	—	—		Supplied by software

CHAPTER 3. MASTER RESET AND PROGRAM RESET

1. MASTER RESETTING

Master resetting clears the entire memory and resumes initial values.

Master resetting can be accomplished by using the following procedure:

Procedure A: 1) Plugin the AC cord to the wall outlet.

2)Set the mode switch to REG position.

3)Let the ECR be witout the memory backup battery.

4)Unplug the AC cord from the wall outlet.

5)Wait over 1 minute for discharging.

6)Plugin the AC cord to the wall outlet.

The master reset can also be accomplished in the following case.

In case power failure occurs when the machine has no battery attached to it, the master reset operation is automatically performed after the power has been restored.

(This is because if power failure occurs with no battery attached to the machine, all the memories are lost and the machine does not work properly after power recovery; this requires the master reset operation.)

2.PROGRAM RESETTING (INITIALIZATION)

This resetting resumes the initial program without clearing memory.

This resetting can be operated at below sequence in PGM mode.

Procedure: 1)	Unplug the AC cord from the wall outlet.
2)	Wait over 1 muinite for discharging.
3)	Set the mode switch to the PGM position.
4)	While holding down the FEED key, plugin the AC
	cord to the wall outlet.

Note: In case power failure occurs when the machine has no battery attached to it, the master reset operation is automatically performed after the power has been restored.

XE-A202U OPTIONS

– 5 –

CHAPTER 4. HARDWARE DESCRIPTION

1. HARDWARE BLOCK DIAGRAM

POWER SUPPLY

STANDARD

DRAWER.

	CPU
		Data bus
	ROM : 256K Byte	Address	RAM
DRIVER , SENSOR	RAM : 20K Byte	bus	128K Byte
				POPUP
PRINTER			Seg. DRIVER
				FRONT
M-T53II				LED
		4 to 16
			Dig. DRIVER
		DECORDER
PAPER TAKE
UP MOTOR
			KEY SCAN SIGNAL	KEYBOARD
				MODE SWITCH
		KEY RETURN SIGNAL

RS232C

RS232

DRIVER

XE-A202U HARDWARE DESCRIPTION

– 6 –

TRANSFORMER	PQ1CG2032	V0 24V
		Drawer

/POFF detect point

PQ1CG2032VLED 5.7V

VCC 5V

VDD 5V

Battery

ON/OFF Control (MODE SW)

VH, VP (8V)

LM2574

+ Tr.

PRINTER HEAD, MOTOR

PAPER TAKEUP MOTOR

ON/OFF Control (MODE SW,

/POFF, CPU P105)

2. DESCRIPTION OF MAIN LSI’S

2-1. CPU (M30624FGAFP)

1) Pin configuration

P97

VDD

VDD

TH

GND

P101

Vref

P103

P104

P105

LATCH

DTS

D0

D1

D2

D3

D4

D5

D6

D7

P10

P11

P12

P13

PH1

100

99

98

97

96

95

94

93

92

91

90

89

88

87

86

85

84

83

82

81

80

79

78

77

76

SIN4

AVCC

VREF

AN0

AVSS AN1

AN2

AN3

AN4

AN5

AN6

AN7

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

D10

D11

D12

P96

1

SOUT4

D13

75

PH2

P95

2

CLK4

D14

74

PH3

P94

3

TB4IN

D15

73

PH4

P93

4

TB3IN

A0

72

A0

P92

5

SOUT3

A1

71

A1

P91

6

SIN3

A2

70

A2

P90

7

CLK3

A3

69

A3

VDD

8

BYTE

A4

68

A4

GND

9

CNVss

A5

67

A5

XCIN

10

XCIN

A6

66

A6

XCOUT

11

XCOUT

A7

65

A7

/RESET

12

/RESET

VSS

64

GND

XOUT

13

XOUT

M30624FGAFP

A8

63

A8

GND

14

Vss

VCC

62

VDD

XIN

15

XIN

A9

61

A9

VDD

16

Vcc

A10

60

A10

VDD

17

NMI

A11

50

A11

CTCRL

18

INT2

A12

58

A12

/FRDY

19

INT1

A13

57

A13

P-OFF

20

INT0

A14

56

A14

MOTOR

21

TA4IN/U

A15

55

A15

BUZ1

22

TA4OUT/U

A16

54

A16

P77

23

TB3IN

A17

53

A17

P76

24

TBEOUT

A18

52

NC

P75

25

TA2INW

A19

51

NC

TA2OUTW

TA1IN/V

TA1OUT/V

TB5IN

TB5OUT

TXD1

RXD1

CLK1

CLKS1

TXD0

RXD0

CLK0

/RTS0

/RDY

ALE

/HOLD

/HLDA

CBCLK

/RD

/BHE

/WR

/CS3

/CS2

/CS1

/CS0

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

P74

P73

CLK

P71

DAT

P67

P66

/FRES

P64

FSD

FRD

FSCK

DR1

/RDY

/HOLD

VCC

NC

NC

/RD

NC

/WR

/CS3

/RAS1

BUSY

/ROS1

2) Pin description

	Pin	SYMBOL	SIGNAL	In/	Function
	No.		NAME	Out
	1	SOUT4	P96	In	Key IN
	2	CLK4	P95	In	Key IN
	3	TB4IN	P94	In	Key IN
	4	TB3IN	P93	In	Key IN
	5	SOUT3	P92	In	Key IN
	6	SIN3	P91	In	Key IN
	7	CLK3	P90	In	Key IN
	8	BYTE	VDD	In	VDD
	9	CNVss	CNVss	In	Normal : L Booting : H
	10	XCIN	XCIN	In	Calender clock :32.768KHz
	11	XCOUT	XCOUT	In	Calender clock :32.768KHz
	12	/RESET	/RESET	In	Reset
	13	XOUT	XOUT	Out	Open
	14	Vss	Vss	In	Vss
	15	XIN	XIN	In	System clock
	16	Vcc	VDD	In	VDD
	17	NMI	P85	In	Not used
	18	INT2	P84	Out	PRINTER/STB2
	19	INT1	/RDY	In	NU FMC (/RDY)
	20	INT0	P-OFF	In	Power off
	21	TA4IN/U	MOTOR	Out	Paper take up motor drive
	22	TA4OUT/U	BUZ1	Out	Buzzer drive
	23	TB3IN	P77	In	RS232 :DR
	24	TBEOUT	P76	In	RS232 :CS
	25	TA2INW	P75	In	RS232 :CD
	26	TA2OUTW	P74	Out	RS232 :ES
	27	TA1IN/V	P73	Out	Drawer drive 2
	28	TA1OUT/V	CLK2	Out	Printer data clock
	29	TB5IN	P71	Out	NU FMC (BUSY)
	30	TB5OUT	TXD2	Out	Print data
	31	TXD1	P67	Out	RS232 :SD
	32	RXD1	P66	In	RS232 :RD
	33	CLK1	/FRES	Out	NU FMC (/FRES)
	34	CTS1/RTS1	P64	Out	RS232 :RS
	35	TXD0	FSD	Out	FMC :Send data
	36	RXD0	FRD	In	FMC :Receive data
	37	CLK0	FSCK	Out	FMC :Shift clock
	38	/RTS0	DR1	Out	Drawer drive 1
	39	CLKOUT	/RDY	In	/RDY (CGROM)
	40	ALE	NC	Out	NOT USE
	41	/HOLD	/HOLD	In	/BOOT MODE
	42	/HLDA	NC	Out	NOT USE
	43	CBCLK	BCLK	Out	BCLK
	44	/RD	/RD	Out	Read
	45	/BHE	NC	Out	NOT USE
	46	/WR	/WR	Out	Write
	47	/CS3	CS3	Out	Display segment latch
	48	/CS2	/CS2	Out	Chip select :for RAM
	49	/CS1	/CS1	Out	EPM Control
	50	/CS0	/CS0	Out	Chip select : for ROM
	51	A19	A19	Out	Address bus :19
	52	A18	A18	Out	Address bus :18

XE-A202U HARDWARE DESCRIPTION

– 7 –

	Pin	SYMBOL	SIGNAL	In/	Function
	No.		NAME	Out
	53	A17	A17	Out	Address bus :17
	54	A16	A16	Out	Address bus :16
	55	A15	A15	Out	Address bus :15
	56	A14	A14	Out	Address bus :14
	57	A13	A13	Out	Address bus :13
	58	A12	A12	Out	Address bus :12
	59	A11	A11	Out	Address bus :11
	60	A10	A10	Out	Address bus :10
	61	A9	A9	Out	Address bus :9
	62	VCC	VDD	In	VDD
	63	A8	A8	Out	Address bus :8
	64	VSS	VSS	In	VSS
	65	A7	A7	Out	Address bus :7
	66	A6	A6	Out	Address bus :6
	67	A5	A5	Out	Address bus :5
	68	A4	A4	Out	Address bus :4
	69	A3	A3	Out	Address bus :3
	70	A2	A2	Out	Address bus :2
	71	A1	A1	Out	Address bus :1
	72	A0	A0	Out	Address bus :0
	73	P17	ENA2	Out	Paper feed motor :ENA2
	74	P16	ENA1	Out	Paper feed motor :ENA1
	75	P15	IN2	Out	Paper feed motor :IN2
	76	P14	IN1	Out	Paper feed motor :IN1
	77	P13	P13	Out	Key/Display
	78	P12	P12	Out	Key/Display
	79	P11	P11	Out	Key/Display
	80	P10	P10	Out	Key/Display
	81	D7	D7	InOut	Data bus :7
	82	D6	D6	InOut	Data bus :6
	83	D5	D5	InOut	Data bus :5
	84	D4	D4	InOut	Data bus :4
	85	D3	D3	InOut	Data bus :3
	86	D2	D2	InOut	Data bus :2
	87	D1	D1	InOut	Data bus :1
	88	D0	D0	InOut	Data bus :0
	89	AN7	STB1	Out	Printer head strobe
	90	AN6	LATCH	Out	Printer data latch
	91	AN5	P105	Out	Printer head voltage ON
	92	AN4	P104	Out	CG ROM Bank
	93	AN3	P103	In	VBAT
	94	AN2	Vref	In	NU Vret
	95	AN1	P101	In	Printer head voltage check
	96	AVSS	VSS	In	VSS
	97	AN0	TH	In	Print head temperature check
	98	VREF	VDD	In	VDD
	99	AVCC	VDD	In	VDD
	100	SIN4	P97	In	Key IN

3. CLOCK GENERATOR

1) CPU

15
XIN
13
XOUT
12MHz
CPU
	R
11	330
XCOUT
	X1
	32.768KHz
10
XCIN
C	C
18P	27P

Two oscillators are connected to the CPU.

The basic clock X2 is supplied from a 12MHz oscillator.

If the CPU was not operating properly, the signal does not appear on this line in most cases.

The sub-clock X1 generates 32.768KHz which is primarily used to update the internal RTC (real time clock).

During the standby mode, it keeps oscillating to update the clock and monitoring the power recovery.

4. RESET CIRCUIT

	VDD	VDD	CPU
MODE SWITCH		IC
SRV' position
	R S-80928ANMP R
			11
R			/RESET
	C	C

(1)When the mode switch is placed in the “SRV” position, the reset signal is sent to the CPU to reset the hardware.

(2)When VDD t2.8V, a reset signal is outputted from the reset IC. (S- 80928ANMP)

5. P-OFF CIRCUIT
			VCC	VLED
R15	R16
2.7K	9.1KG
				R20
				2.7K
			R19
C14		R17	56K
1uF/50V
		0
			8
		3		5	8
			1		7	/POFF
		2		6
		IC4A	4	IC4B	4
	R18	BA10393		BA10393		C15
	3.9K					0.1uF
ZD4			P-OFF
MTZJ5.1B

XE-A202U HARDWARE DESCRIPTION

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