Zenith H-100 - Page 89

10-82
U 17-1
=
P
U34-18
U17-2
=
P
U34-16
U17-4
=
(H)
U20-6
U17-6
=
P
U34-14
U17-7
=
L
U19-1
U17-14
=
(H)
U 17-1,
U17-2,
U17-4,
U17-6
U17-15
=
(H)
U17-1,
U17-2,
U17-4,
U17-6
U19-1
=
(L)
U26-8
U19-14
=
L U19-1
U20-1
=
(L)
U28-13
U20-2
=
(L)
U28-13
U20-3
=
P U27-6
U20-5
=
(L)
U20-1, U20-2,
U20-3
U20-6
=
(H)
U20-1,
U20-2, U20-3
U21-1
=
(H)
U27-11
U21-2
=
(H)
U27-8
U21-3
=
(H)
U21-1,
U21-2
U21-4
=
(H)
U17-15
U21-5
=
(P)
U33-12
U21-6
=
(H)
U21-4, U21-5
U21-8
=
L
U21-10
U21-1O
=
L
U22 of data bus is defective.
U21-11
=
(H)
U21-12,
U21-13
U21-12
=
(H)
U27-11
U21-13
=
(P)
U 33-12
U22-39
=
(L)
Check the data bus at pins
7 through
14. These lines
pul se from a high impedance
state while" Read Completed"
is being printed.
If not,
then check the components
along the data bus.
U23-2
=
(L)
U30-16
U23-4
=
P
U34-18
U23-5
=
P
U34-16
U23-6
=
(H)
U23-2, U23-4,
U23-5
U23-8
=
H
U23-13
U23-13
=
L
U24-15
5-173