PTM~:3022
Figure 5-31. Control Panel Mounting.
FLUORESCENT COPY LAMP REPLACEMENT 1. Gently twist the lamp about 30° toward the front of the Printer.
2. Lift the lamp toward the front of the Pririter in a slightly upward direction until it is free of its sock-ets.
3. Remove the light shield and rubber grommets from the defective lamp.
4. Put the grommets on the new lamp and install the lamp.
5. Orient the shield in relation to the lamp so that light will be directed toward the platen, and install the shield.
Maintenance, Parts Replacement and Adjustments
HAMMER BANK AND PRINT BELT ASSEMBLY 1. Remove the Control Panel mounting hardware and drop the Control Panel forward.
2. Remove the ribbon from the Printer.
3. Remove the keyboard.
4. Remove the connector clamping bracket from under the Printer (see Figure 5-30).
5. Disconnect the connector cable plugs from the Hammer Driver Converter board (HDC), the Photo-cell board Plug and the fluorescent lamp plug.
6. Remove the left drive belt by pushing down on the belt at the lower front pulley and rotating the print belt.
7. Remove the three screws on each side of the frame holding the Hammer Bank Assembly. Notice that the rear screw on the left side holds the spring for the photocell preamplifier.
8. Grasp the pulley shaft and the lower portion of the casting and lift the assembly up and forward (see Figure 5-32).
9. Reverse steps 1 through 8 to install the assembly.
Make certain of the following things:
- The Spring Clip under the left rear Hammer Bank mounting screw must be in a vertical position after the hardware is tightened in place.
- The Hammer Bank must seat firmly in to the Hammer Bank alignment bar (Figure 5-33).
NOTE
Hammer bank alignment bar is factory ad-justed. DO NOT MOVE.
- After installing the Hammer Bank, check dis-tance between platen and hammer faces. Dis-tance should be 0. 180 to 0. 190 inches ( 4. 5 to 4. 75 mm). H distance is out of tolerance, loosen the screws holding the hammer bank and make sure hammer bank alignment bar is firmly seated in the mating parts of the frame.
Check distance again.
10. Reinstall the Left Drive Belt.
REMOVAL
CLEVIS AND PLUNGER (See Figures 5-34 and 5-35)
1. Raise cover and remove the platen.
2. Remove the paper pan and front pressure rollers.
Maintenance, Parts Replacement and Adjustments GEH-2185
PTM-3014
Figure 5-32. Hammer Bank Removal.
HAMMER BANK ALIGNMENT BAR ( FACTORY SET DO NOT ADJUST )
'
,/
..ail
PTM·3027
Figure 5-33. Hammer Bank Alignment Bar.
5-26
3. Loosen rear belt guide and remove the print belt.
4. Remove both front and rear belt guides.
5. Remove the rebound bar assembly.
6. Select the clevis to be removed and move the attached hammer forward until the clevis disconnects.
7. Twist the clevis 45 ° to 90° (in either direction) and pull the clevis and plunger assembly out of the hammer bank. Remove clevis assembly toward rear of Printer.
Be careful not to damage the adjacent clevis assemblies when removing the damaged clevis and plunger.
INSTALLATION
1. Insert the plunger into the appropriate coil po-sition from the rear side of the hammer bank .
2. Rotate the clevis until the pin drops through the metal tab on the hammer bank.
GEH-2185 Maintenance, Parts Replacement and Adjustments
Figure 5-34. Clevis Disconnect.
Figure 5-35. Clevis and Plunger Removal.
Maintenance, Parts Replacement and Adjustments
3. Rotate clevis assembly 45° to 90°.
4. Push the appropriate hammer forward and hook the clevis onto the hammer.
5. Install and adjust front belt guide.
6. Install print belt.
7. Install and adjust rear belt guide.
8. Install and adjust rebound bar.
9. Install rollers, paper pan, and platen.
10. Check hammer throw adjustment.
PHOTOCELL ADJUSTMENT PRELIMINARY SETTING (Figure 5-36)
The photocell is initially adjusted via the following procedure:
1. Loosen the vertical mounting screw.
2 flat washers (Large washer on slot. Small washer next to screw head. )
Two Photocells ,
Mounting Scre'.v
Photocell Block (Top View)
GEH-2185
2. Turn the horizontal adjusting screw approximately 2 1/2 turns until the required clearance, . 050 in. (1. 3 mm), is obtained between the photocell block and the left end of the Hammer Bank.
3. After this clearance is established, proceed with the final adjustment procedure.
FINAL SETTING
The final photocell timing is accomplished by using a timing gauge (44A410619-G01) as illustrated in Figure 5-3 7. The procedure is as follows:
1. Print out at least 23 random characters on the paper.
2. Turn off the Printer and place the timing gauge over the hammers on the left end of the hammer bank.
Position the slots on the underside of the gauge over the hammers. (The top part of the gauge should be against the printed characters on the paper. )
3. Check the centering of these characters appearing between the hairlines on the gauge. If these characters
.050 Initial Setting
Lamp
Adjusting Screw
Lamp
Hold down,
careful not to __)_....-=--~
Photocell Block
Positioning Screw
break lamp. l.'::=======~1
....
1--_ _ _ Mounting Bracket Left Pulley CastingPTM-3006
Figure 5-36. Preliminary Photocell Adjustment.
5-28
GEH-2185
are consistently to the right or the left of the distance between the hairlines, the timing should be adjusted as follows:
a. Loosen the vertical mowiting screw on the photo-cell block and turn the horizontal photophoto-cell ad-justing screw as required.
b. If the characters between the hairlines are too far to the left, turn the screw connterclockwise.
c. If the characters between the hairlines are too far to the right, turn the screw clockwise.
d. Tighten the vertical monnting screw on the photocell block.
e. Turn on the Printer and repeat Steps 1 through 3.
Figure 5-37. Final Photocell Adjustment.
ELECTRICAL ADJUSTMENTS
The TermiNet 300 Printer requires very few electri-cal adjustments. While various printed boards do contain coils and potentiometers, most of these vari-able components have been set in the factory and must not be readjusted in the field. Those controls which are considered field adjustable are detailed below:
PROC BOARD
lP - (Speed Protection). To adjust, set scope at . 5 msec/ cm. , sync positively with probe on TP2 (PCA). The observed signal width should be approximately 2. 7 msec. By applying a drag
Maintenance, Parts Replacement and Adjustments
on the print belt, the signal will expand. The Printer should cut off when the signal width is at 3. 0 msec. The pulse width can be increased by adjusting the control connterclockwise.
2P - (Voltage Protection). To adjust, the Printer must be typing at rate 30 (from tape) and be powered from a variable AC line source. An accurate voltmeter must be used; Starting at 117 volts, slowly decrease voltage. Printer should go to STANDBY at 100 ± 1 volts. The trip point voltage can be lowered by adjusting the control cowiterclockwise.
Pl-SPEED
PROTECTION P2-VOLTAGE PROTECTION
PTM-3039
Figure 5-38. PROC Board Adjustments.
T&ABOARD
lP - This control sets the loudness of the alarm beep. Adjust the control wiitl an alarm beep can be heard above any normal room back-ground noise.
2P - This control sets the loudness of the keyboard beep. Adjust the control witil a keyboard beep can be heard above any normal room back-ground noise.
OPTIONS
The following discussions do not cover all options available for the TermiNet 300 Printer. Only those
Maintenance, Parts Replacement and Adjustments
IP-ALARM 10NE
VOLUME PTM-3043
Figure 5-39. T&AC Board Adjustments.
options which require a special setting or critical adjustment are included in this subsection.
ANTI-SNAG DEVICE ADJUSTMENT (Figure 5-40) Printers which have the Forms Tractor paper advance option are equipped with an Anti-Snag assembly. Tc set this assembly for proper operation follow these steps.
1. Loosen the Allen screw in the bar adjustment slot.
2. Adjust the Paper Guide bar tension until the Paper Guide has a light contact fit with the Platen, over the entire use range of the Platen.
3. Seat the Allen screw but do not overtighten.
Once this adjustment is made the assembly can be detached from the Printer without disturbing the tension setting.
EXTERNAL PAPER HANDLING SYSTEM
WIDE ROLL PAPER HANDLER (See Figure 5-41) The clearance between the collar on the left side of the Printer and the inside of the bracket should be 0. 93 inches (23. 25 mm).
MOUNTING BRACKETS AND BUMPERS (See Figure 5-42)
1. The cross bars should be approximately 1. 06"
(26. 5 mm) above top of the bustle cover. If neces-sary, adjust mounting brackets.
ALLEN
SCREW PAPER