Sharp ER-A770 Service Manual download pdf (Page 13)

CHAPTER4. SRV RESET (Program Loop Reset) and switch to SRV mode

In the ER-A770, the following reset switch (location No. : SW1) is

used to switch to the service (SRV) mode and to reset.

SRV. reset

Used to return the machine back to its operation state after a lock up

has occurred.

PROCEDURE

1) Turn off the AC switch.

2) Set the reset switch to "ON" position

3) Turn on the AC switch. (Wait one second)

4) Turn to "OFF" the reset switch.

5) The SRV mode is displayed as shown below.

DISPLAY:

Reset

switch

Rear side :"ON" position(Reset state)

ONOFF

Front side :"OFF" position(Run state)

ONOFF

RESET SW

SW1

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 88 89

SERVICE MANUAL 1
CHAPTER 1. SPECIFICATION 2
3. Display 4
CHAPTER 2. OPTIONS 5
ER-A770 bus connector 7
CHAPTER 3. SERVICE PRECAUTION 8
IPL from IR 10
Connected 115200 10
21 22 23 24 25 26 27 28 10
SENDING 00000 11
4. Note for handling of LCD 12
6. Others 12
SRV. reset 13
MRS-1 Key 14
Symbol/PartsCod) 15
MRS-3 Key 16
ENTER PASSWORD 16
1. General 17
2. System configuration 17
3. Diagnostics 17
3-2. RAM Diagnostics 18
UP-P02MB2 Check 19
Error Address xxxxxxH 19
Write Data xxxxH 19
Read Data xxxxH 19
3-5. RS232 I/F Diagnostics 20
RS232 CH1 Check 21
ER-DR : ERROR!! 21
Rear Display Check 23
• Satellite machine setting 24
• Master machine setting 25
Magnetic Card Reader Check 26
TRACK1:BUFFER EMPTY 26
TRACK1:MCR ERROR 26
TRACK2:BUFFER EMPTY 26
TRACK2:MCR ERROR 26
1. Hardware block diagram 27
2) Block diagram 29
3) Pin description 30
2-2. G.A.(MPCA8) 31
2-3. OPC2 35
1) Features 38
2) Pin configuration 38
3) General description 39
4) Pin description 39
2) General description 39
3) Pin configuration 40
4) Functional description 40
5) Pin description 40
DMA CONTROLLER 41
1) FEATURES 41
2-7. MB62H149 42
1) Pin Configuration 44
2-9. CKDC9 (HD404728B02FS) 46
(MAX4MB) 48
4. LCD display 49
5. Customer display 49
6. Pseudo SRAM (Standard) 50
7. NOR-type flash memory 50
8. SSP control 50
9. Interrupt control 50
10. WAIT control 51
11. CKDC9 51
12. Option RAM interface 51
13. Reset sequence 52
14. Drawer 52
16. RS232 53
CHAPTER 8. CIRCUIT DIAGRAM 54
FLASH ROM 56
ODD SIDE 57
EVEN SIDE 57
+24V/+5V POWER CIRCUIT 65
DC-DC CNV CIRCUIT 66
CONNECTOR 67
2. CKDC PWB 68
3. INVERTOR PWB 70
4. N/F PWB 71
2. Main PWB (Side-B) 73
3. Mother PWB 74
4. CKDC PWB 74
5. Inverter PWB 75
6. Noise filter PWB 75
PARTS GUIDE 76
1 Top cabinet etc 77
2 Bottom cabinet etc 79
4 Main PWB unit 81
5 Mother PWB unit 84
6 CKDC PWB unit 84
7 NF PWB unit 85
8 Inverter PWB unit 85
9 Service tools 85
10 Supply 85
PARTS CODE NO 86

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Sharp ER-A770 Service Manual Page 13

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