B. STUDY POPULATION II
VI. RESULTS
6. EXPRESSION OF GENES RELATED TO THE INFLAMMATORY
6.4. JNK-1
MODEL ACTION
Emergency Shut-off Switch lamp
is flashing QT-750 6-Way Table Control Board AY40-030T
con-tains various status/error LEDs to indicate cur-rent operational status of the table and to identify particular error types. The steps that follow provide a description of each LED indi-cator and suggests an appropriate action in the event the indicator is lit.
Error LED D12 (OBS SENS #1) is lit and error LED D53 (EMERG.) is flashing
QT-750 This LED is lit when front left obstruction sen-sor is activated:
1. Remove obstruction.
2. Adjust front left obstruction sensor.
Error LED D16 (OBS SENS #2) is lit and error LED D53 (EMERG.) is flashing
QT-750 This LED is lit when rear left obstruction sen-sor is activated:
1. Remove obstruction.
2. Adjust rear left obstruction sensor.
Error LED D22 (OBS SENS #3) is lit and error LED D53 (EMERG.) is flashing
QT-750 This LED is lit when front right obstruction sen-sor is activated:
1. Remove obstruction.
2. Adjust front right obstruction sensor.
Error LED D24 (OBS SENS #4) is lit and error LED D53 (EMERG.) is flashing
QT-750 This LED is lit when rear right obstruction sen-sor is activated:
1. Remove obstruction.
2. Adjust rear right obstruction sensor.
Status LED D32 (DN LMT) is lit QT-750 This LED is lit when table top is at "normal"
down limit. No action is required; this is a nor-mal condition when table is in down position.
Status LED D36 (UP LMT) is lit QT-750 This LED is lit when table top is at "normal" up limit. No action is required; this is a normal condition when table is in up position.
Status LED D42 (PEDDIS) is lit QT-750 No action is required; this is a normal condi-tion when Foot Pedal/Operator Control Handle Disable Switch is activated.
Pedal/Operator Control Handle disabled = ON Pedal/Operator Control Handle enabled = OFF Status LED D48 (FLOAT) is lit QT-750 This LED is lit when table top "float" function is
not active. No action is required; this is a nor-mal condition when Float Foot Pedal or Opera-tor Control Handle FLOAT Push button is not pushed in.
Error LED D51 (BELTS) is lit and error LED D53 (EMERG.) is flashing
QT-750 This LED is lit when the Drive or Sync belt sen-sor is activated, or drive motor thermal sensen-sor is activated, or transformer A1T1 input voltage falls below required operational voltage. Per-form following checks:
1.Check if a drive belt fault condition occurred (i.e. snapped or disengaged belt), sensed by normally-closed MOTOR BELT switch S22.
2.Check if a sync belt fault condition occurred (i.e. snapped or disengaged belt), sensed by normally-closed SYNC BELT switch S23.
3.If no belt fault is found, a DC Motor over-temperature fault may have occurred (motor temperature exceeds 70°C), sensed by DC Motor thermal switch S21. Allow DC Motor to cool, then re-check table opera-tion. If still not operating, remove power from table and check S21 with ohmmeter. If open, replace S21.
4.If none of the above, the 20 VAC input from transformer T1 may have dropped below 15% nominal. Check for 110 VAC across ter-minals L1 and L2 on DC Motor Driver Board A2, and also on
6-Way Table Control Board A1 connector J1, across pins 15 and 16.
Error LED D53 (EMERG.) is lit steady and Emergency shut-off switch is activated.
QT-750 Release Emergency Switch, error light should extinguish.
Table 4-1. Troubleshooting Information
PROBLEM/INDICATION TABLE
MODEL ACTION
Error LED D56 (U/D LMT) is lit and error LED D53 (EMERG.) is flashing
QT-750 This LED is lit when table top redundant down limit switch S10 or redundant up limit switch S8 was activated, indicating excessive table up/down speed or a failure or mis-alignment of primary up limit switch S9 or primary down limit switch S7. To regain table movement, de-activate the de-activated redundant switch (i.e., S10 or S8) then move table up or down as required until table top height is within normal operating height range.
Check table speed and adjust as required (i.e., readjust MOTOR SPEED potentiometers A1R27 (Down Motion) and A1R78 (Up Motion) on 6-Way Table Control Board A1). It is recom-mended that the travel time (fully raised to fully lowered) remain in the range of between 8-14 seconds.
Status LED D31 (BRAKE) is lit QT-750 Power is applied to three fail-safe brakes (i.e., brakes are in released state). No action is required; this is a normal condition during table top up/down motion.
Table does not drive up or down; error LED D53 (EMERG.) is flashing.
QT-750 1. Check if the Emergency Shut-off switch is activated (Emergency Shut-off switch indi-cator light is illuminated, D53 is flashing).
2.Check Up foot pedal connections at connec-tor pins A1J2-1 and A1J2-15 and Down foot pedal connections at pins A1J2-11 and A1J2-15.
3.Check for loose pin connection on 6-Way Table Control Board A1 connector J1 (pins 10 and 2 to DC Motor, and pins 8 and 14 to Motor Brake).
Table 4-1. Troubleshooting Information
PROBLEM/INDICATION TABLE
MODEL ACTION
Table does not drive up or down; error LED D53 (EMERG.) not flashing.
QT-750 1.Verify the following:
a. AC supply to DC Motor Driver Board A2 is normal (110 to 120 VAC during standby; 100 VAC when driving up or down).
b. DC supply on DC Motor Driver Board A2 is normal (160 to 165 Vdc during standby; approx. 145 Vdc when driving up or down).
c. A normal "speed command" input volt-age as measured between S1(L) and S2(W) on the DC Motor Driver Board A2 (0 Vdc during standby; between 4.5 and 12.0 Vdc when driving up or down).
2. If above appear normal, and an insufficient sag in the DC occurs, do the following:
a. Disconnect the A+ and A- leads from the Minarik DC Motor Driver Board A2.
b. Measure Ohms across the leads you removed as you command a vertical motion. Once the control relays are activated, the motor armature's input impedance (Low Ohms) should appear on these leads.
c. If no change occurs, the problem is in the current path to the motor. If a low ohms reading does occur and no motion or a slow motion occurs, replace the defective DC Motor Driver Board A2.
Table 4-1. Troubleshooting Information
PROBLEM/INDICATION TABLE
MODEL ACTION
Table drives up and down, but
tabletop does not float. QT-750 1.Check if the Emergency Shut-off switch is activated (Emergency Shut-off switch indi-cator light is illuminated, D53 is flashing).
2.Check +24 vdc supply fuses A1F1 (8A) and A1F2 (10A) on 6-Way Table Control Board A1.
3.Verify 20 vac is present across 6-Way Table Control Board A1 connector J5 pins 1 and 3.
4.Verify +24 vdc is present across 6-Way Table Control Board A1 connector J3 pins 1 and 8 (for Transverse Magnet) and connector J3 pins 5 and 6 (for Longitudinal Magnet).
5.Check if transistors Q1 and Q3 on 6-Way Table Control Board A1 are shorted.
No Power to the Table QT-740,
QT-750 1.Check for correct incoming line voltage at terminal block TB1-1 and TB1-2.
2.Check line input fuses F1 and F2.
3.Check for 115 VAC across TB1-5 and TB1-9. If not present, replace line filter.
4.Check 115 vac and 20 vac outputs of AC Input Transformer T1: measure for 110 vac across 6-Way Table Control Board A1 con-nector J1-15 and Emergency Shut-off switch terminal 1. Measure 20 vac across 6-Way Table Control Board A1 connector J5 pins 1 and 3.
Image Receptor Cabinet lock
not working QT-740,
QT-750 1.Verify +24 vdc is present across 6-Way Table Control Board A1 connector J3 pins 2 and 9.
2.Check +24 vdc supply fuse A1F1 on 6-Way Table Control Board A1.
3.Check Bucky Switch S15 and bucky electro-magnet.
Table 4-1. Troubleshooting Information
PROBLEM/INDICATION TABLE
MODEL ACTION
Table drives up, does not drive down; status LED D36 (UP LMT) is lit, error LED D56 (U/D LMT) is not lit
QT-750 1.While activating Down Foot Pedal, monitor voltage across 6-Way Table Control Board connector J2 pins 11 and 15 to verify opera-tion of Down Pedal Switch S2. Replace switch if faulty. If switch is good, proceed with next step.
2.Check signal at TP6 on 6-Way Table Control Board A1 while activating DOWN foot pedal.
It should toggle between high (+15 vdc) when pedal is activated and low (approx. 0 vdc) when pedal is not activated. If not, replace A1 board.
Table drives down, does not drive up; status LED D32 (DN LMT) is lit, error LED D56 (U/D LMT) is not lit.
QT-750 1.While activating Up Foot Pedal, monitor volt-age across
6-Way Table Control Board connector J2 pins 1 and 15 to verify operation of Up Pedal Switch S1. Replace switch if faulty. If switch is good, proceed with next step.
2.Check signal on TP3 on 6-Way Table Control Board A1 while activating UP foot pedal. It should toggle between high (+15 vdc) when pedal is activated and low (approx. 0 vdc) when pedal is not activated. If not, replace A1 board.
Float Top Locking Magnets not
holding sufficiently. QT-740,
QT-750 Refer to "Float Top Locking Magnet Check"
procedure in this chapter for Float Top Locking Magnet adjustment instructions.
Table 4-1. Troubleshooting Information
PROBLEM/INDICATION TABLE
MODEL ACTION
REMOVAL/REPLACEMENT PROCEDURES
The following procedures provide step-by-step instructions for removal and replacement of the repairable components in the table.
Replacing the Drive Belt (Model QT-750 Tables Only) WARNING! Make sure to remove any objects from the tabletop before continuing.
1. Raise the table to the full up position and then turn power off.
2. Remove upper and lower table covers.
3. Install Service Safety Bracket.
4. Remove four (4) hex bolts securing the DC Motor to Table Base Plate (see Figure 4-5).
5. Remove Drive Belt from pulley.
6. Install replacement Drive Belt on pulley.
7. Install, but do not tighten, four (4) hex bolts securing DC Motor to the Table Base Plate.
8. Adjust belt tension by sliding DC Motor toward front end of Table Base Plate. When belt tension is set, tighten DC Motor mounting screws.
Figure 4-5. DC Motor Location
9. Verify Drive Belt Safety Switch is in open position (if not, motor will not operate).
DC MOTOR
DC MOTOR
MOUNTING SCREWS (4X)
DRIVE BELT
10. Remove Safety Bracket.
11. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation).
12. Turn on power. Perform an operational test and check table travel and positions.
Replacing the Sync Belt (Model QT-750 Tables Only) WARNING! Remove any objects from the tabletop before continuing.
1. Raise the table to the full up position and then turn power off.
2. Remove upper and lower table covers.
3. Install Service Safety Bracket.
4. Remove four (4) hex bolts securing the DC Motor to the Table Base Plate (see Figure 4-5).
5. Remove Drive Belt from pulley.
6. Loosen two (2) bolts securing Sync Belt Switch Bracket (see Fig-ure 4-6) and remove Sync Belt Switch Bracket and set aside. (Do not disconnect switch wires).
Figure 4-6. Location of Sync Belt Switch Bracket and Tensioner BELT
TENSIONER SYNC BELT
SWITCH BRACKET
7. Loosen nut on Belt Tensioner to create slack in belt (see Figure 4-6). If necessary, remove Belt Tensioner to achieve sufficient slack for belt removal.
8. Loosen two (2) 1/4-20 socket head cap screws securing Ball Screw Mounting Block at pulley end of Lead Screw to Base Plate (see Figure 4-7). Gently tap Block to remove it from Lead Screw.
9. Remove Sync Belt from pulleys.
10. Install replacement Sync Belt on pulleys.
11. Verify the distance between Ball Nut Blocks and center Ball Screw Mounting Blocks (see Figure 4-7) are equal (±0.003"). If not, rotate either shaft until distances are equal (within tolerance).
This is to ensure equal torque on both Lead Screws.
12. Install Ball Screw Mounting Block on pulley end of Lead Screw and secure to Table Base Plate using two (2) 1/4-20 socket head cap screws.
Figure 4-7. Ball Nut and Screw Mounting Block Locations
13. Re-install Belt Tensioner (if removed). Adjust belt tension as fol-lows:
a. If not already done so, loosen nut on Belt Tensioner.
b. Increase belt tension by adjusting Belt Tensioner downward.
The belt is properly tensioned when, at the midpoint of the longest belt span, there is approximately 1/4" deflection.
BALL SCREW MOUNTING BLOCK CENTER
BALL SCREW MOUNTING BLOCK BALL NUT
BLOCKS
c. When belt tension is set, tighten nut on Belt Tensioner.
14. Verify Sync Belt Safety Switch is in open position (if not, motor will not operate).
15. Remove Safety Bracket.
16. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation).
17. Turn on power. Perform an operational test and check table travel and positions.
Replacing the DC Motor (Model QT-750 Tables Only)
1. Raise the table to the full up position and then turn power off.
2. Remove upper and lower table covers.
3. Install Service Safety Bracket.
4. Cut the two DC Motor wires connected to 6-Way Table Control Board A1 connectors A1J1-12 and A1J1-10.
5. Remove four (4) hex bolts securing the DC Motor to the Table Base Plate (see Figure 4-5).
6. Remove Drive Belt from DC Motor pulley.
7. Loosen set screw securing pulley to motor shaft and remove pul-ley from shaft. Retain pulpul-ley (and key) for re-assembly.
8. Slide pulley (with key inserted) onto shaft of replacement DC Motor.
9. Reinstall Drive Belt on DC Motor Pulley.
10. Mount DC Motor to Table Base Plate using four (4) hex bolts.
11. Be sure pulley on DC Motor is aligned with pulley on Lead Screw to within ±1/16". After adjusting pulley position, tighten set screw on DC Motor pulley.
12. Connect replacement DC Motor wires to 6-Way Table Control Board connector A1J1-12 and A1J1-10.
13. Verify Drive Belt Safety Switch is in open position (if not, motor will not operate).
14. Remove Safety Bracket.
15. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation).
16. Turn on power. Perform an operational test and check table travel and positions.
Replacing the DC Motor Driver Board A2 (Model QT-750 Tables Only)
There are two different types of DC Motor Driver Boards used on QT-750 tables; Bodine-manufactured type and Minarik manufactured type. A key distinguishing characteristic to determine the type installed is the electri-cal connector; Bodine uses a DIN type connector having nine screw-down terminals, Minarik uses three separate "STACON" type terminals (see Fig-ures 4-8 and 4-9).
Bodine-Manufactured DC Motor Driver Board Removal/Replace-ment
.
Figure 4-8. DC Motor Driver Board A2 Layout (Bodine-manufactured) To replace the DC Motor Driver Board A2, proceed as follows:
1. Raise the table to the full up position and then turn power off.
2. Remove upper and lower table covers.
3. Install Service Safety Bracket (see Figure 4-1).
WARNING! To prevent electrical shock, make sure power is off and all capacitors are discharged before proceeding.
4. Disconnect plug from connector on DC Motor Driver Board A2.
POTENTIOMETERS
SPEED REG.
MAX. SPEED MIN. SPEED ACCEL.
TORQUE
5. Remove four (4) screws securing DC Motor Driver Board A2 to Board Mounting Bracket and remove board. Retain screws for re-assembly.
6. On replacement DC Motor Driver Board A2, adjust five potentiom-eters as follows (see Figure 4-8):
a. Set ACCEL pot. to mid-range (half-way) b. Set MIN. SPEED pot. to mid-range (half-way) c. Set MAX. SPEED pot. to mid-range (half-way) d. Set TORQUE pot. fully counter-clockwise e. Set SPEED REG. pot. fully counter-clockwise
7. Set DIP switches 1-8 on DC Motor Driver Board A2 as follows:
1 = OFF 5 = ON
2 = ON 6 = OFF
3 = ON 7 = OFF
4 = OFF 8 = ON
8. Position replacement DC Motor Driver Board A2 on Board Mount-ing Bracket and secure usMount-ing screws removed in previous step.
9. Connect plug into connector on DC Motor Driver Board A2.
10. Remove Safety Bracket.
11. Turn on power. Perform an operational test and check table travel and positions.
12. If necessary, readjust MOTOR SPEED potentiometer A1R27 (Down Speed Motion Control) and MOTOR SPEED potentiometer A1R78 (Up Speed Motion Control) on 6-Way Table Control Board A1. It is recommended that the travel time (fully raised to fully lowered) remain in the range of between 8-14 seconds. Also, the MIN. SPEED and/or MAX. SPEED potentiometers on DC Motor Driver Board A2 may be adjusted to increase/decrease accelera-tion, but do not increase either beyond half-way.
13. Reinstall upper and lower table covers (refer to Chapter 2, Assembly and Installation).
Minarik-Manufactured DC Motor Driver Board Removal/Replace-ment.
Figure 4-9. DC Motor Driver Board A2 Layout (Minarik-manufactured) To replace the DC Motor Driver Board A2, refer to Figure 4-9 and proceed as follows:
1. Raise the table to the full up position and then turn power off.
2. Remove upper and lower table covers.
3. Install Service Safety Bracket (see Figure 4-1).
TO ARMATURE via Control PCB (MEASURE AT TP1 & TP2) TOP
RED
RED/GRN
red black -DC IN
LINE VOLTAGE ACCEL/DECELIR COMP CURRENTLIMIT
MAX SPEED +DC IN A+ R504 between these two points
160-165 VDC (Sags to 145 VDC during
motor operation) when driving up/down)
C C W
WARNING! To prevent electrical shock, make sure power is off and all capacitors are discharged before proceeding.
4. Disconnect seven "STACON" type connectors from terminals on DC Motor Driver Board A2.
5. Remove four (4) screws securing DC Motor Driver Board A2 to Board Mounting Bracket and remove board. Retain screws for re-assembly.
6. On replacement DC Motor Driver Board A2, viewing each potenti-ometer as a clock-face, set the pointers to the following initial o'clock positions, where 12:00 o'clock is pointing straight up (see Figure 4-9), set each as follows:
• Max Speed 6:00 (fully clockwise)
• Current Limit 4:00
• Accel/Decel 3:30
• IR Comp 4:00
7. Position replacement DC Motor Driver Board A2 on Board Mount-ing Bracket and secure usMount-ing screws removed in previous step.
8. Re-connect seven STACON connectors to terminals on DC Motor Driver Board A2.
9. Remove Safety Bracket.
10. Turn on power.
11. On DC Motor Driver Board A2, measure the DC voltage across S1 (L) and S2 (W). Adjust the Motor Speed potentiometer A1R27 (Down) located on Table Control Board A1 (AY40-030T), to 10 seconds when driving table down. Use potentiometer A1R78 (Up) to adjust motor speed to 8 seconds when driving table up (recommended). Any speed between 8-14 seconds is acceptable.
Table 4-2. Minarik DC Motor Driver Board Normal Voltage Levels