Brother International MD-817 Service Manual - Page 76
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Wiper operates. NO #113 YES TR 3B: OK #113-1 Thread NO trimmer operates. #112 TR 2B: OK #112- 1 YES NO Replace TR3. NO Replace TR2. CPU pin 61: OK #113-2 NO Replace the CPU. YES Replace HIC2. CPU pin 60: OK #112-2 NO Replace the CPU. D (P53) YES Replace HIC2. D (P53) Needle (lower) V 1 Needle (upper) #113-1 (TR3-B) #112-1 (TR2-B) #112-1 TR2-B TR2 base 1V or less #112-2 CPU pin 60 1.5±0.5 V 4.5V or more I )I TR TR6 o.-;•-:,3 ,5' .,. °FL'''1 '5 7ffg Ii• ,7.s-SA,qA. TR5 TR1 . .., .4. ri. 71" r, .. r.- ft Oq tA . :E LI ": 11 rri '''' 2 -"60 !IT 1,.,...irteir 5 4 _i L---za--- r la.95 ;CD- I__w_ _i 1,_.1 .. r '6. ''' t 7) - - BPD 2• 71 c7O. .1(ti.''' ' 4?' ...., r L Meerars-xces 91 Zer" # 113 - 2 (CPU-61) #112-2 (CPU-60) ti 117 ' n . '- : • j... $ ' O It1, ,_ • mai • low --- 1 •n flt t*ris, 0-,.. I -S5 0.5 V or less #113-1 PTR3 B PTR3 base T1 ' T2 k 1V or less 1.5±0.5 V #113-2 CPU pin 61 0.5V or less 4.5V or more #112, #113 related OV: Check pin OV TR 26: OK #112-1 Refer to figure above. CPU pin 60: OK #112-2 Refer to figure above. TR 3B: OK #113-1 Refer to figure above. -72- CPU pin 61: OK #113-2 Refer to figure above.