Instruction manual

Chapter 3 Troubleshooting Procedures

other troubleshooting procedures. When you have completed this

procedure, return to the procedure that sent you here.

1. Power off the printer. Open the rear cabinet door. Unload the power

stacker. Move the elevator up and down by hand, checking that it moves

smoothly and without chattering or shuddering.

Eliminate causes of chattering or shuddering. (E.g., loose, damaged,

or broken constant force springs, bent or misaligned rails,

obstructions, etc.)

NOTE: If the elevator assembly or the rails are bent or damaged, you must

replace the entire power stacker assembly.

2. Move the elevator up and down by hand. Check that the limit switches are

physically tripped when elevator reaches top and bottom of travel.

If necessary, gently bend the contact arms to adjust limit switches. If

you cannot adjust a switch that requires adjustment, replace it.

3. a) Unfasten the cable clamp holding the stacker control panel cables.

b) Disconnect stacker rail cable connector P107 from connector J3 on the

back of the stacker control panel. (See Figure 59, page 313.)

c) Locate pin 1 of connector P107. (See the cable assembly drawing in

Appendix A, page 263.)

d) Check the stacker rail cable and limit switches for continuity and shorts.

Check continuity of the switch when open and closed. (See the power

stacker control panel PCBA pinout drawing on in Appendix A, page 270.

STK FULL is the upper limit switch, STK LIMIT is the bottom switch.)

Replace the stacker rail cable if it is damaged or fails continuity test.

Replace any switch that fails continuity test.

Stacker motor check

NOTE: This procedure tests the four stacker motors and their cables. You will

usually be referred to this procedure from other troubleshooting

procedures. When you have completed this procedure, return to the

procedure that sent you here.

1. a) Power off the printer.

b) Open the rear cabinet door.

c) Unfasten the cable clamp holding the stacker control panel cables.

d) Disconnect stacker rail cable connector P107 from connector J3 on the

back of the stacker control panel. (See Figure 59, page 313.)

e) Disconnect stacker frame cable connector P102 from connector J4 on

the rear of the stacker control panel. (See Figure 59, page 313.)

f) Locate pin 1 of connector P102 and connector P107. (See the cable

assembly drawings in Appendix A, page 291 and page 294.)

g) Check both cables for pin damage, continuity, and shorts. Check all

motors for 15.2

± 1.5 Ohms on both phases. (Refer to the power stacker

control panel PCBA pinout drawing on page 270.)

Replace any cable that is damaged or fails continuity test.

Replace any motor that fails the resistance test.