Assessments - 5, GPA: 4.4
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Because the direction of the current path has been reversed by releasing the "ON" push button, the motor will immediately start to run in reverse. B4 5.0 TROUBLESHOOTING (Continued) 5.1.1 Electrical Operation (Continued) When the "OFF / REV" push button is depressed, switch contacts F3 - E3 are opened to deactivate the relay and turn the shredder off. If this push button is depressed when the shredder is turned off, contacts F4 - E4 are closed and power is supplied to the motor. The motor will run in the reverse direction as long as this push button is depressed. 5.1.2 Mechanical Operation During operation the upper cutting shaft is gear driven by the lower cutting shaft. The lower cutting shaft is chain driven by the motor. The upper and lower cutting shafts are machined to a close tolerance so that when mated, there is a nominal gap of .001 of an inch between the cutting disks of the upper and lower shafts. Paper inserted between these rotating shafts is sheared. If after use, the gap between the cutter disks exceed .004 of an inch, paper may fold between the cutting disks without shearing. Cutter shaft adjustment is explained in Section 6.0. 5.2 General Troubleshooting Malfunction corrections are based on visual observation by the operator. The causes of the malfunctions are isolated by the symptom of the malfunction and noting at which point in the operating cycle the malfunction occurred. Malfunctions that occur during operation can be pinpointed to a defective electrical circuit or to a mechanical part by refering to the Principles of Operation in the preceding paragraphs and to the electrical schematic diagrams and the electrical wiring diagrams. B5 5.0 TROUBLESHOOTING (CONTINUED) 5.3 Troubleshooting Guide Chart The troubleshooting guide chart that follows is arranged in order of the normal operational sequence. When a malfunction occurs, read down the SYMPTOM column until you reach the appropriate description for your symptom. Read the corresponding PROBABLE MALFUNCTION, and then preform the recommended procedure in the CORRECTIVE ACTION column. When replacing electrical components having push on type terminals, tag the electrical leads that are removed to facilitate reconnecting them. Refer to the wiring diagram in figure 5.5 to resolve any wiring difficulties that may occur. Warnings Always unplug the shredder to avoid possible severe electrical shocks before attempting to preform any repair. 5,3 Troubleshooting Guide Chart SYMPTOM Motor does not run. No indication of power. Motor hums but does not run. Motor continues to run in reverse after a jam. PROBABLE CAUSE Power cord disconnected. Shred bag full Flap switch bad or misaligned. Main control switch bad. Relay bad. Reverse switch is bad. Cutting head jammed. Relay bad. Main control switch bad. Motor defective. Reverse - stop switch is bad. Reverse switch bad. CORRECTIVE ACTION Connect power cord to outlet. Replace shred bag. Perform continuity check ana replace or adjust flap switch as needed. Press ON switch and test for continuity across terminals A2-B2, A4-B4, and C2-D2. Replace Switch if defective. Perform continuity test, replace relay if defective. Test for continuity. Unjam cutting head. Perforin continuity test and replace relay if defective. Press ON switch and test for continuity across terminals A2-B2, A4-B4, and C2-D2. Replace switch if defective. Test and replace motor if defective. Perform continuity test and replace switch if bad. Perform continuity test and replace switch if bad. 5.3 TROUBLESHOOTING GUIDE CHART (Continued) SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION Motor does not reverse when jammed. Shredding capacity is diminished. Main control switch bad. Paper jammed in cutters. Cutting head is not properly aligned. Cutters out of adjustment. Perforin continuity test across switch terminals A3 - B3 and A1 - Bl. replace switch if bad. Unjam cutters. Properly align cutting head on base Adjust cutter locknut. B8 5.4 Electrical Schematic Diagram 115 VAC GRN WHT Rl si S2 i , , E3 1-^1»- S3 I F4 n E4 02 i A3 o C2 B3 J B9 5.5 Electrical Wiring Diagram 115 VAC 51 FLAP SWITCH --------------* BLK C H o N C > > PC > ORG > Rl-C> S2 REVERSE SWITCH ---------------+ pTO --->R1-H0> C N 0 N C WHT -->S3-D2> S3 CONTROL SWITCH 4 —+ I o 0 1 ♦-+■ I I ! I I I I o 3 + I 0 +— 1 o 2 +—* I 0 •+-■ 1 o I +- I o 0 1 B 0 1 +« J I I D + ■ 1 c 0 1 -o 1 WHT > RI >--- BRN ---> HI > BLO > Ml > ORG ---> Rl-C> WBT >S2-NC> GRY ---> Rl > TEL ---->Rl-KO> RED ----> MI > > PC > > Ml > Rl RELAY — PUR < S2-C< l