F RIDEN 1155 PROGRAMMABLE CALCULATOR MAINTENANCE

3-2.10 PRINT QUALITY (Cont.)

(7) Check to see that the locknuts are tight on the Allen screws after adjustment.

NOTE: Machine speed will be affected if the carriage is dragging as a result of the allen screws being in too far. This can be checked by printing a full line of characters for exactly one minute, before and after adjustment. Then compare the number of lines printed before the adjustment and after the adjustment. If fewer lines are printed after adjustment, the carriage is dragging.

2. HAMMER DRIVE (Print Pulse Width) ,

Attach scope probe to the rear power trans~stor on the printer driver card. The pulse width must be: 750

±i80

micro seconds. Adjust by turning pot on driver card.

NOTE: Ideally, this control is adjusted by use of an oscilloscope, in the field how-ever, a practical and quick method of adjusting this control is accomplished by turning the control while observing repeated digit 8 printing until best print quality has been obtained without embossing the paper. The adjustment may effect the top or bottom of the character being printed, therefore, the adjustment should be accompanied by adjusting the Timing Eccentric.

3. TIMING ECCENTRIC (Magnetic Pickup Gap)

TIMING ECCENTRIC

FIGURE 3-10

The magnetic pickup gap adjustment (Adj. 3-2.6) can be varied by the eccentric nut (Figure 3-10) which moves the pickup coil mounting plate. Loosen lock nuts and rotate the eccentric nut to obtain full print with uniform impact. NOTE: Avoid pro-longed printing at out-of-time state, or it could cause physical damage to the hammer and print wheel.

6-15-73 3-15 TP-285

3-2.10 PRINT QUALITY (Cont.)

4. ECCENTRIC GUIDE SHAFT (Hammer-Print Wheel Distance)

FIGURE 3-11

The Hammer Print Wheel distance can be varied to obtain best print quality by the use of the Eccentric Guide Shaft (Figure 3-11). While observing the printout

(series of 8's) and with the eccentric lock nut loose, slowly turn the eccentric guide shaft once around 360 degrees (clockwise); then continue back to the position that gives the best print quality. Secure the lock nut.

The printed characters must appear dark and free of obvious ink starvation and must be distinct and uniformly detailed without flat or missing tops or bottom of characters. Also, the characters must not vary in intensity from one end of the line of print to the other.

If all characters do not print with close to the same degree of quality, it is most likely due to run-out caused by bad print wheel or print shaft, or improperly adjusted hammer assembly and these parts should therefore be replaced.

3-2.11 PAPER DEFLECTOR

If smearing print is observed during the print quality adjustments, it may be necessary to adjust the paper deflector. This is accomplished by gently tapping the paper deflector toward the paper until smearing stops. After adjusting, check t~ see that the locking screw is tight.

FRIDEN 1155 PROGRAMMABLE CALCULATOR

MAINTENANCE

3-3.0 POWER SUPPLY ADJUSTMENT

FIGURE 3-12

Adjust potentiometer R17 on the power supply card for an output of +5 volts +5%.

Connet VOM on pin 3.

Check each of the following outputs:

PIN 1 • -5 volts PIN 2 • -9 volts PIN 3 • +5 volts PIN 7 • -12 volts

PIN 15

•

^Ground

6-15-73 3-17 TP-285

FRIDEN 1155 PROGRAMMABLE CALCULATOR

MAINTENANCE

3-4.0 MAGNETIC CARD READER

The Model 511 Magnetic Card Reader is factory adjusted using various gages to set the Head position, the card drive shaft angle, etc., therefore, it is not intended that these critical adjustments be made in the field. Other adjustments and checks are as follows:

3-4.1 SWITCH ADJUSTMENTS

The two microswitches must be adjusted so that a magnetic card will operate them reliably. If adjustment is indicated, proceed as follows:

SWITCH 2 SWITCH I

ADJ.

FRONT REAR

.003 SHIM

FIGURE 3-13

(1) As shown in Figure 3-13, the screws designated "1" are to be tight, and the two adjustment screws are to be loose.

(2) Attach an ohmmeter to the

"c"

and "NC" pins of Switch 111.

(3) Set Switch 111 so it will be actuated by an 0.003" thick by 1.5" wide shim stock inserted in the card chute from the FRONT of the card reader. Tighten the adj-ment screw.

(4) Attach an ohmmeter to the

"c"

and "NC" pins of Switch 112.

(5) Set Switch 112 so it will be actuated by the same shim stock inserted in the card chute from the REAR of the card reader. Tighten the adjustment screw.

(6) Recheck the operation of both switches by the shim stock and by a magnetic card.

6-15-73 3-19 TP-285

1-4.0 MAGNETIC CARD READER ADJUSTMENTS (Cont.)

(1) Equipment required l.

1155 Programmable Calculator 511 Magnetic Card Reader Pre-programmed card #3.

Pre-programmed card #4.

Tektronix Model 547 Oscilloscope with 1Al Plug-in and Xl probe (or equivalent).

FRIDEN 1155 PROGRAMMABLE CALCULATOR MAINTENANCE

3-5.0 PC CARD COMPONENT LAYOUT

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SCHEMATICS

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6-15-73 3-22 TP-285

3-4.5 SIGNAL LEVEL CHECK (Cont.)

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3-4.6 CARD READER CLEANING

TYPICAL CROSSTALK WAVEFORM FIGURE 3-14

O.7V MINIMUM

The card chute should be cleaned periodically, using air pressure at approximately 15 psi.

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F RIDEN 1155 PROGRAMMABLE CALCULATOR

Dans le document SINGER BUSINESS (Page 115-137)