Zenith H-100 - Page 18

3-144
U180-10 = H
U186-13
=H
U186-16
= H
U
186-17 = H
(MB1)
(MB1)
(MBl )
(MB 1 )
U186-17
U186 is defective.
t
U186 is defective.t
U186-13. U186-18
tNOTE:
Before replacing U186. check the continuity between
pins 6 and 15. and between pins 7 and 14. Also
check for ground at pins 2. 8. 9. 10. 11. 12. and 19.
===============;======================================================
SWAP TEST #4
1. Remove the jumper between ground and pin 5.
2. Connect the jumper from pin 5 to +5 volts.
CHECK
.U180-9 =H
End of tests.
U180-10 =H
U186-13
= H
U
186-17 = H
U186-18
= H
(MB1)
(MB1)
(MB1)
(MB1)
(MB1)
IF NOT OKAY. CHECK
U180-10
U180-17
U186 is defective.
t
U186-13. U186-18
U186 is defective.
t
tNOTE. Before replacing U186. check the continuity between
pins 6 and 15, and between pins 7 and 14. Also
check for ground at pins 2. 8, 9, 10. 11, 12, and 19.