48
Test mode
Remove front panel and easy test can be performed by the operations below in the state that connector of switch jig for test is connected toCN1 mounted on the
microcomputer circuit board.
1. From the state that the power to the machine is turned OFF, shortcircuit the 1-2 pins of CN13 connector of the microcomputer circuit board and turn ON the power to the
machine.
Turn ON the switches below to perform the respective operations.
1
SW-A : Aging (Needle throwing pattern and disengaging pattern repeat.)
2
SW-B : Needle shifts to left position.
3
SW-C : Needle shifts to main shaft disengagement position.
4
SW-D : Right needle entry
2. From the state that the power to the machine is turned OFF, shortcircuit the 3-4 pins of CN13 connector of the microcomputer
circuit board and turn ON the power to the machine. Turn ON the switches below to perform the respective operations.
1
SW-A : Working of threading working body can be confirmed.
2
SW-B : Working of bobbin thread winding STM can be confirmed.
3
SW-C : Lateral feed STM shifts to the left position.
Feed STM shifts to the feed “0” position.
4
SW-D : Position of thread release 2
3. Tests below can confirm the functions on the microcomputer circuit board.
Turn OFF the power to the machine and from the state that 1-2 pins and 3-4 pins of CN13 mounted on the microcomputer circuit board are shortcircuited, turn ON the
power to the machine while the switches below are turned ON. Then tests below can be executed.
1
Turn ON the power while SW-A is ON. ............................. Test of SDRAM
2
Turn ON the power while SW-B is ON. ............................. Test of LCDRAM
3
Turn ON the power while SW-C is ON. ............................ Test of mask ROM
4
Turn ON the power while SW-D is ON. ............................ Test of flash memory
5
Turn ON the power while thread winding SW is ON ......... Test of smart media
6
Turn ON while presser lifting SW is ON. ........................... Test of serial communication
Two kinds of tests below can be performed for the test of serial communication.
1
Connect 9-pin connector of jig to CN23 mounted on the microcomputer circuit board to perform the test. (Test of circuit board)
2
Connect serial communication relay wire to CN23 mounted on the mocrocomputer circuit board and connect D sub-connector of jig to sub-connector to perform the
the test. (Test of circuit board and relay wire)
The result of test is displayed by the color of emitting light of LED.
Testing
Orange
OK
Green
NG
Red
Switch jig for test
SW–C
SW–D
SW–B
SW–A
CN1
Summary of Contents for E9020
Page 1: ...E9020 SERVICE MANUAL...