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MZ-80K

I

I

• Waveforms

of

Cassette Tape Recorder

1st stage

amp.

output

waveform

Operational

amp.

input

waveform

Operational amp.

input

waveform

CD

®

CID

_Iv

pp

L

6mV~

--

-

--

~-~-

pp

1.8V

T

DV

Operational

amp.

input

waveform

Operational

amp.

output

waveform

Output

waveform

@

@

®

T{

n

f1

-r-

e-

T

I

i

1.5Vpp

4Vpp

5Vpp

Lv

u V v v

,

~

"

v

---'-

L-

Record

input

waveform Record amp.

waveform

Record amp. waveform

CD

®

®

,1MB

2

v

r

l

r-

.-

.-

.-

T

-

e-

i

4.8Vpp

~PJ

I

i

~

_L

L-

--

c-

L-

'--

Head

input

waveform

Q9J

-,

~

1\

1\

!

\

\

i

6Vpp

I1

V

,

V

I1

-

The

figures encircled

byOcorrespond

to

those

of

"Wiring

Diagram"

-

"Check

Points

of

Waveforms".

KEYBOARD

SECTION

Problem 1: A

charactor

isn't

displayed even if a

key

is

pushed.

(1) Poor soldering

(2)

Mechanical key defective

(3)

Printed line

broken

If

there

is

nothing

abnormal

in

the

above checks,

proceed

with

the

checkings

of

"CPU Board

Section".

-24-