DOWNLOAD Sharp ER-A770 (serv.man4) Service Manual ↓ Size: 17.65 MB | Pages: 94 in PDF or view online for FREE

Model
ER-A770 (serv.man4)
Pages
94
Size
17.65 MB
Type
PDF
Document
Service Manual
Brand
Device
EPOS / ERA770 V2 (With Circuit Descriptins)Service Manuals
File
er-a770-sm4.pdf
Date
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Sharp ER-A770 (serv.man4) Service Manual ▷ View online

No.
NAME
PARTS CODE
DESCRIPTION
1
1 hole clerk key
The key No.1 to No.6 ore supplied together with ER-A770.
Key No. 89
Key No. 90
Key No. 91
Key No. 92
Key No. 93
Key No. 94
Key No. 95
Key No. 96
Key No. 97
Key No. 98
Key No. 99
Key No. 100
Key No. 101
Key No. 102
Key No. 103
Key No. 104
Key No. 105
Key No. 106
Key No. 107
Key No. 108
Key No. 109
Key No. 110
Key No. 111
Key No. 112
Key No. 113
Key No. 114
Key No. 115
Key No. 116
Key No. 117
Key No. 118
Key No. 119
Key No. 120
Key No. 121
Key No. 122
Key No. 123
Key No. 124
Key No. 125
Key No. 126
5. Service tools
No.
NAME
PARTS CODE
PRICE
DESCRIPTION
1
Terminator(50  )
AZ
for SRN in-line system
2
MCR test card
BE
for UP-E12MR
3
RS232 loop back connector
BC
for RS232 connector
4
Expansion PWB
BX
6. Supplies : None
No.
NAME
PARTS CODE
PRICE
1
Blank key sheet
AQ
7. How to use service tools
7-1. Expansion PWB : CKOG-6724BHZZ
Extrenal view
Plain view
Connection diagram
7-2. MCR test card: UKOG-6718RCZZ
Used when executing the diagnostics of the UP-E12MR.
External view
Test pins : Used to check the bus signals.
Bus connector : Used to check the bus signals.
Connected to the UP-3300 Mother PWB.
ER-A770 bus connector
ER-A7RS
CHAPTER 3. SERVICE PRECAUTION
1. Adjustment for SRN (IN-LINE) interface
circuit
If transistor Q9 in the transmitter/receiver section has been replaced
or if the SRN level requires readjustment, the following alignment is
required:
1) Tools and Instruments Required
Oscilloscope (50MHz or better)............................................1
ER-A770 ..............................................................................1
2) Dummy Network Specifications
The oscillator should be connected to the points indicated by 
 and
.
: Connect the positive side of the oscillator.
: Connect the negative side of the oscillator.
3) Connections
Attach the BNC connector to the SRN connector (CN7) on the main
PWB.
4) Alignment Procedure
 When Using an Oscillator
a) Checking the 1MHz oscillator output
Using an oscilloscope check the 1MHz oscillator’s output waveform.
NOTE: The oscillator used should have an output impedance of
50 .
b) Connecting the oscillator and its adjustment
Connect a dummy network or branch-trunk network to the output of
the SRN connector (CN7), and connect the oscillator to the dummy or
branch-trunk network.
Waveform adjustment
Adjust VR1 until the signal waveform as shown in Fig. 4 is obtained
across TP1 and TP2 (GND).
Turning VR1 clockwise extends the interval of T1.
2. IPL (Initial program Loading) function
1) Introduction
The application software of the ER-A770 written in the flash ROM.
In the following cases, writing procedure of the application software
into the flash ROM is required
When the flash ROM is replaced with new one. The service part
flash ROM does not include the application software in it.
When IPL writing is required because of change in the software.
The service part ofthe main PWB unit includes the flash ROM with
the application software written in it, and there is no need for
writing the application software when replacing the main PWB unit.
2) IPL procedure
There are two ways of IPL procedures.
IPL from P-ROM via ER-A7RS
IPL from PC communication (Please refer the next section)
The detailed descriptions on the above procedures are given below.
R2
R1
C1
R1 100
Ω
J (1/4W carbon)
R2 150
Ω
J (1/4W carbon)
C1 0.01µF(mylar firm)
Fig. 1 Dummy network
BNC connector
Main PWB
Fig. 2
5V
0V
0.5µS
0.5µS
Fig. 3 1MHz oscillator output waveform
T1=580 to 620ms
T2=380 to 420ms
T1
T2
VOH
VOL
Fig. 4 Receiver regeneration waveform (with dummy network)
TP1
TP2
Fig. 5 Board location
3) IPL from P-ROM via ER-A7RS
(1) Install the two master ROMs to the IC socket (IC12 , IC13) on the
ER-A7RS.
Master ROM -1 : VHI27801RAHxx
Master ROM -2 : VHI27801RAIxx
(2) IPL sitch on the ER-A7RS : Set the IPL SW to ON position.
(3) Install the ER-A7RS to the ER-A770. (The ER-A770 power should
be turned OFF.)
(4) Turned on the power of the ER-A770.
(5) The buzzer sounds intermittently during the running of IPL and the
program finishes after the buzzer gives five beeps at short inter-
vals.
(6) Turn OFF the power of the ER-A770.
(7) Remove the ER-A7RS from the ER-A770.
(8) Perform the Master reset. 
3. ER-A770 Utility tools
1. Outline
This Specification document describes the explanation about "POSU-
TILITYTOOL.EXEhand "02FD.EXE".
"POSUTILITYTOOL.EXE"and "02FD.EXE" works on Windows 95/98
of PC and they have the following
Functions by connecting ER-A770 with RS232.
POSUTILITYTOOL.EXE  : IPL of ER-A770 Program Object
02FD.EXE
 : All RAM Data Upload/Download
(PC software tool instead of the current
ER-02FD.)
2. Environment
PC and ER-A770 are connected by RS232. 
Connect the CH2 port of the ER-A770 to the RS-232 interface of the
PC.
RS232 Cable Connecting:
3. Procedure
3.1 POS UTILITY TOOL
No
Procedure on P.C. side
No
Procedure on ER-A770 side
1
Install "POSUTILITYTOOL.EXE" on the P.C.
2
Turn OFF the power.
3
Select "IPL Mode".
Set "IPL Switch" of ER-A770 to "ON".
4
Turn ON the power.
5
Starting of "IPL Mode".
ER-A770 shows
"IPL from Serial I/O"
6
Connect P.C. and ER-A770 (CH2) via RS232. (Fig 1)
IPL  SW
OFF
ON
IC13 ROM2
IC12 ROM1
MASTER 
P-ROM -2
MASTER 
P-ROM -1
RS-232
PC
POS
CH2
Fig. 1 Connection between PC and ER-A770
[PC]
3  TXD
3  TXD
2  RXD
2  RXD
5  S.G.
5  S.G.
[ER-A770]
IPL  SW
OFF
ON
IPL from Serial I/O
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