UNITRA ZK 246 - Page 2

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TECHNICAL

AND

PERFORMANCE

DATA

I.

MECHANICAL

PART

1.

General

2.

Disassembly

and

Reassembly

Procedures

2.1.

Replacement

of

Winding

and

Counter

Belts

2.2,

Replacement

of

Pushbuttons

2.3.

Removal

of

Bridge

2.4

Replacement

of

Speed

Control

Cam

2.5.

Removal

of

Printed

Circuit

Boards

2.6.

Design

and

Replacement

of

Drive

Mechanism

3.

Lubrication

4.

Adjustment

.1.

Adjustment

of

Pulley

on

Motor

Shaft

.2,

Adjustment

of

Flywheel

.

Height

Adjustment

of

Turntables

.4.

Mechanical

Measurements

.5.

Check

of

Overriding

Clutch

Moment

.

Check

of

Tape

Run

Uniformity

.

Adjustment

of

Tape

Run

.8.

Adjustment

of

Winding

System

.

Adjustments

to

Be

Made

with

Pushbutton

"START”

or

"FORWARD

WINDING”

Depressed

4.10.

Adjustments

to

Be

Made

with

Pushbutton

”"REWIND-

ING”

Depressed

4.11.

Adjustment

of

Main

Brakes

4.12.

Adjustment

of

"QUICK

STP”

Brake

4.13.

Correct

Winding

II],

ELECTRICAL

PART

5.

General

6.

Replacement

and

Adjustment

of

Heads

6.1.

Replacement

of

Universal

Head

6.2.

Adjustment

of

Universal

Head

6.3.

Assembly

of

Erasing

Head

7.

Adjustment

of

Bias

Signal

and

Erase

Current

Gene-

rator

7.1.

Adjustment

of

Generator

Frequency

7.2.

Erasing

Voltage

7.3.

Adjustment

of

Bias

Signal

Voltage

8.

Voltage

Amplifier

Checking

and

Adjustment

l.

Recording

Circuit

.L1.

Measurement

Set-Up

1

1

.1.3.

Frequency

Response

1.4.

Noise

Voltage

8.2.

Playback

Circuit

8.2.1.

Measurement

Set-Up

8.2.2.

Gain

8.2.3.

Frequency

Response

8.2.4.

Noise

Voltage

9.

Power

Stage

9.1.

Measurement

Set-Up

9.2.

Gain

and

Distortions

9.3.

Frequency

Response

10.

Check

and

Adjustment

of

Automatic

Tape

End

Stop-

ping

System

ll.

Tape

Measurements

11.1.

Measurement

Set-Up

11.2.

Gain

11.3,

Check

of

Erasure

Effectiveness

at

40

Hz

Frequency

11.4.

Frequency

Response

11.5.

Harmonic

Distortion

11.6.

Tape

Speed

and

Tape

Speed

Non-uniformity

12.

Transistor

Replacement

List

of

Transistors

and

Equivalents

8

8

8

8

8