Zenith H-100 Service Manual page 92

5-176
WAVEFORMS
The waveforms shown in this section are generated by a normally
functioning controller board in an idle state. Use these
wav efo rm s as a reference when checki ng waveforms on the board
you are servicing.
The waveform at .the right
was taken from U22-26.
This is the RCLK signal
that originates at U1-12.
In an idle state the
frequency of RCLK is
around 250 kHz.
2V/DIV
I -.......--_._-...t--- ._..._ ..... - - ..._.-
2,uS/D11J
The waveform at the right
was taken from U22-24.
This is the CLK signal
that originates from the
oscillator circuits. The
frequency of this signal
is 1 MHz when the board is
in an idle state.
2V/DIV
~
to •
1 .1
500nS/DIV
._._
. .
-
1--
..
-
'r-j
n-
r
or
.....
.J
~
U
.:.-t•. g'
ttl+
~
--..
- II
""=-
_.k
...
-
t - -
1--
The waveform at the right
was taken from CP1. This
is the VCO signal that
originates from the VCO,
U5-8. The frequency of
this signal is 4 MHz when
the board is in an idle
state.
ZV/DtV
I-~'-~-""-'
.._....
fOOn5/DIV
-+--+-