Sharp ER-A330 Manuel d'utilisateur télécharger pdf (Page 16)

11. Clock generator circuit

X2: 4.19MHz is inputted as the CPU main clock.

X1: 32.768KHz is inputted as the time renewal clock.

12. Buzzer circuit

This circuit sounds buzzer with the BUS signal from the CPU.

13. Reset circuit

The reset signal is formed with VOC and VDD. The /RESET signal is

also outputted when the mode switch is at SRV position.

IC2

CPU

32.768KHz

C14

33P

C16

22P

R51

330K

R93

4.19MHz

XT2

P04

IC2

CPU

BUZ

IC6A

KID65003P

BZ1

VCC

IC2

CPU

/RESET

VDD

VCC

D24

1SS133

C18

22U/16V

C19

10U/50V

Q16

C3198

R59

MODE SWITCH

/RESET

C11

M104

R58

– 15 –

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 38 39

SERVICE MANUAL 1
CHAPTER 1. SPECIFICATIONS 2
1) Standard keyboard layout 3
2) Key top name 3
1) Operator display 4
3) Lamps 4
1) Printer specifications 5
2) Roll paper 5
29.4 29.4 6
CHAPTER 2. OPTIONS 7
1. Block diagram 8
2) ER-A330 9
3. RAM control 12
VP: +24V 13
6. Drawer drive circuit 14
7. Keyboard circuit 15
8. Display circuit 15
9. Power supply circuit 15
13. Reset circuit 16
11. Clock generator circuit 16
12. Buzzer circuit 16
Test command 17
1. 2. 3. 4. 5. 6. 7. 8. 9. 0 18
8. 8. 8. 8. 8. 8. 8. 8. 8. 8 18
6) Test No. 6: RAM test 19
1. Circuit diagram 20
CIRCUIT(ERA310/A330 POP) 21
CIRCUIT(ERA310) 22
CIRCUIT(ERA330) 23
2. PWB layout 24
ER-A310 25
ER-A330 25
Exteriors[ER-A310] 26
Exteriors[ER-A330] 28
Keyboard unit 30
Drawer box unit(SK423type) 32
6 Main PWB unit[ER-A310] 33
Main PWB unit[ER-A310] 34
Main PWB unit[ER-A330] 35
8 Pop-up PWB unit 36
9 Articles for consumption 36
10 Service route options 36
ER-A310U 37

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Sharp ER-A330 Manuel d'utilisateur Page 16

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