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DENFORD MACHINE TOOLS LIMITED
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ORAC TROUBLE-SHOOTING GUIDE
MANY PROBLEMS WHICH ARE INITIALLY ATTRIBUTABLE TO AM
ELECTRONIC MALFUNCTION ARE USUALLY EXTERNAL TO THE
COMPUTER AND ASSOCIATED ELECTRONICS. THE FOLLO~ING LIST
SHOULD BE CHECKED BEFORE TROUBLE-SHOOTING IS STARTEDi1) IS THE A.C. POWER INPUT GOOD?
2) ARE ALL THE FUSES GOOD AND SECURE ?
3) IS THE MACHINE ON AN AXIS LIMIT SWITCH ?
4) HAS THE STOP LOCK PUSH BUTTON BEEN RELEASED ?
5} HAS A p.e.B. OR A RIBBON CABLE VIBRATED LOOSE DURING
TRANSIT ?
6) HAVE THE TOOL OFFSETS AND TOOL "0" BEEN SET CORRECTLY?
ORAC 85 FAULT FINDING CHART
CAUSE
FAULT
MACHINE WILL NOT POWER UP
AND COOLING FAN AT REAR OF
HACHINE IS NOT RUNNING
ACTION
(i)
INCOMING SUPPLY HAS
FAILED
CUSTOMER TO MAKE GOOD
(ii)
MAINS INPUT FUSE BLOWN
REPLACE FUSE FSl 6.3A ANTI SURGE
IF FUSE CONTINUES TO BLOW REFER
TO DENFORD SERVICE DEPARTMENT
MACHINE WILL NOT POVER UP
(COOLING FAN RUNNING BUT
NO V.D.U, AXIS MOVEMENT
OR SPINDLE ROTATION)
REFER TO DIAGRAMS M2105, 2123
POWER SUPPLY FAULTY IN THE
COMPUTER RACK
REMOVE POVER SUPPLY CHECK FUSE.
IF BLOWN REPLACE - IF FUSE
BLOWS AGAIN REPLACE POWER
SUPPLY
AXIS/AXES WILL NOT RUN OR
ERRATIC
(ALSO REFER TO DIGIPLAN
SD2 & 3 USER GUIDE)
(i)
MACHINE AXIS ON LIMIT
PRESS LiS OVER-RIDE PUSH BUTTON
AND JOG AXIS OFF LIMIT
(ii)
AXIS FUSE FS2
REPLACE WITH 3.1SA
(iii)
AXIS DRIVE FAILURE
REMOVE DRIVE BO~RD AND CHECK
FUSE LOCATED ON DRIVE BOARD IF
GOOD INTERCHANGE AXIS DRIVES
(REFER TO DIAGRAM 2105) IF
FAULT TRANSFERS TO THE OTHER
AXIS REPLACE DRIVE BOARD.
(iv)
LOGIC FAILURE
IF PROBLEM STILL EXISTS:-
BLO~N
X AXIS REPLACE TIOB
Z AXIS REPLACE TIOA
IF PROBLEM STILL PERSISTS
REPLACE INTERFACE PCB PC 1965 REFER TO DIAGRAM M210S
FAULT
SPINDLE WILL NOT RUN (ALSO
REFER TO FAULT FINDING
CHART IN DRIVE HANDBOOK
CAUSE
ACTION
MACHINE ON AXIS LIMIT
PRESS L/S OVER-RIDE PUSH BUTTON
AND JOG AXIS OFF LIMIT
NO SUPPLY AT DRIVE MAINS
INPUT TERMINALS
SHOULD BE 240 VOLTS SINGLE
PHASE CHECK SUPPLY BACK TO
MAINS INPUT REFER TO DRAWING
NUMBER H2050
START CIRCUIT NOT MAKING OR
STOP CIRCUIT OPEN
CHECK OPERATION OF START AND
STOP RELAYS ON PC 1965
INTERFACE BOARD. R6 STOP,
R5 START. IF RELAYS ARE Nor
SYITCHING PROBLEM COULD BE:1. KEYBOARD, 2. TIOB BOARD,
3. TIOA BOARD, 4. 1965 BOARD.
REPLACE AS NECESSARY, IF R6
AND R5 ARE SWITCHING CHECK
AT TB1 1951 PCB (REFER TO
DRAWING NUMBER S2109) AT
TERMINALS 6 & 7, THAT START
CIRCUIT IS MADE AND 7 & 8
STOP CIRCUIT IS HADE IF GOOD
CHECK TB2, 3 & 4 START
CIRCUIT IS MAKING IF NOT
CHANGE 1951 PCB.
NO DC CONTROL VOLTAGE
CHECK OUTPUT VOLTAGE AT T82, 1
, 2 (O-lOV-DCl IF NOT PRESENT
CHANGE 1951 PCB IF VOLTAGE
STILL NOT GOOD CHANGE TIOC PCB
IN COMPUTER RACK
FAULTY DRIVE UNIT
IF STOP CIRCUITS ARE FUNCTIONAL
TH£ SIGNAL OUTPUT VOLTAGE IS
GOOD, THE DRIVE UNIT HAS 240V
MAINS SUPPLY AND THERE IS NO
OUTPUT SUPPLY TO THE MOTOR, THE
DRIVE UNIT IS FAULTY, REPLACE
DRIVE UNIT. FIRST CHECK MOTOR
HAS NO SHORT CIRCUITS BETWEEN
WINDINGS AND TO EARTH
FAULTY 110TOR
IF VOLTAGE IS PRESENT AT THE
MOTOR TERMINAL AND IS NOT
TURNING CHECK MOTOR WINDINGS
AND REPLACE HorOR
---------------,--------------------,------------------CAUSE
FAULT
DATA ENTRY
UNABLE TO LOAD PROGRAMME
FROM CASSETTE OR WRITE
TO CASSETTE
ACTION
(i)
FAULTY TAPE CASSETTE
TRY NEW TAPE
(i i)
DATA TIMING OUT OF
SPEC.
SET FOR 83 HICRO SEes, AT TIOB
PCB
(iii)
FAULTY CASSETTE DRIVE
REPLACE CASSETTE UNIT
(iv)
WRITE ENABLE PINS
HISSING ON TAPE
CASSETTE
INSERT PINS
UNABLE TO LOAD FROM
KEYBOARD
FAULTY TIOB
FAULTY KEYBOARD
REPLACE
REPLACE
AXES MISPOSITIONING
EXCESSIVE BACKLASH
CHECK GIB STRIPS BALLNUT AND
LEADSCREW BEARING END FLOAT
EXCESSIVE MOTOR TORQUE
REDUCE CURRENT LIMIT. REMOVE
DRIVE UNIT FROM COMPUTER RACK
AND ADJUST DIP SWITCHES IN
ACCORDANCE WITH TABLE, DIGIPLAN
USER GUIDE.
NOMINAL SETTINGS 2.4A
HORIZONTAL VERTICAL DRIFT
REMOVE MONITOR AND ADJUST
HORIZONTAL AND VERTICAL
POTENTIOMETERS
FAULTY GDM PCB
FAULTY MP09 PCB
REPLACE
REPLACE
FAULTY CRT
REPLACE V.D.U. UNIT
V.D.U.
1. SCROLLING
2. PICTURE BREAKING AND
DISPL~YING
ERRONEOUS
CHARACTERS
3. V.D.U. DISPLAYS
CONTINUOUS LINE
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