TM  55-4920-402-13&P Para/Step 4-13c  (3) 4-13c (6), (7) 4-13d (3), e(5), f(5), g(4). (6), (9),  (11) 4-14a 4-14b 4-14g 4-14h Table   4-18.   Troubleshooting   Procedures   (Strobex/Tester) Trouble mproper   Voltages Table 4-8 mproper  Voltage  at  TP6 mproper  Indications mproper   Indications   at TP9,  TP10,  Rear  Terminal C1201;  Junction  of CR1203 and L 1202 Probable  Cause Defective   Components Fuse  F1  blown High  Voltage  Power  Supply Defective Oscillator   Defective Oscillator  Defective  or Misadjusted Tester-Section Perform  4-14a  to  Determine  Operational  Capability  of  Tester Motor does not run Grinding  Noise Profile cam out of tolerance Rotor Disc hits Magnetic Pickup Probable  Remedy Associated   components (Fig C-5) and Perform Para  4-13  as  required or   Para/Step   below 1. F1  Fuse  (Fig  4- 11) 2. Q1, Q2, Q6 (Fig 4-11) A501, S501 (24, 11, Fig C-5) and  associated components   (Fig FO-3) Q4   (Fig   4-11),   A501 (24, Fig C-5) and associated   com- ponents  (Fig  FO-3) Q3, Q5 (Fig 4-11), S501B (11 Fig C-5) and  associated  com- ponents  (Fig  F03).  Ad- just  Strobex  (Para  4- 20c)as   necessary. Blown  Fuse  or  Defective Motor F101  Fuse  (39  Fig  C- 7), Motor  B1  (28  Fig C-7)  or  associated components  (Fig  C-7). Cam  follower  rubs  against Adjust  set  screw  (11 profile  cam Fig C-7). Worn  profile  cam 1. Replace   profile cam (12, Fig C-7). Rotor  hub  screws  rubs 2. Loosen  set  screw against   motor (11, Fig C-7) and adjust  height  of rotor  hub  and rotor  disc  as  re- quired. Rotor  disc  improperly  set Same  as  above  4-14g (2). Change 4 4-16.5