Zenith H-100 - Page 92

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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

-+--+-

Related product manuals

Zenith Z-100 Series