TANDBERG 64 series User Manual

January 1967
TANDBERG
TAPE.RECORDER
Models 64x
and 62x
Alignment
instruction
for
heads
and
electronics
Preface
The models 64x
and
62x
are improved versions
of has been introduced
to improve the frequency
re-
the earlier models
64-62
and this
alignment instruc-
sponse and the signal
to noise
ratio.
tion is
an appendix to
the
service
manual
for
model
The
oscillator has
been redesigned
and
fully transis-
64:-62.
lt
covers the special
head alignments
and torized. Certain minor
changes have been
introduced
electrical adjustments necessary for
model
64x
and
in the equalization circuits, mainly changes
of com-
62x.
ponent
values. A
microswitch
is
further introduced
in
the
bias
circuit
to
reduce
the
bias
in
1.7/e i.
p.s.
The models
64x and
62x
have the
same operation
tape speed. This switch
is
operated
automatically
by
facilities
as 64-62. A new,
and
separate
bias head
the
speed
selector
mechanism. See fig. 3.
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TANDBERGS
RADIOFABRIKK
A/S
OSLO
NORWAY

TANDBERG 64 series Specifications

General

Brand	TANDBERG
Model	64 series
Category	Voice Recorder
Language	English

Summary

2.0 Oscillator and Bias Head Circuit Adjustments

Oscillator and Bias Head Circuit Tuning

Adjust oscillator frequency and bias head circuits using test points and components like C610, L601.

3.0 Head Alignment with Test Tapes (Model 64x)

3.1 Playback Head Alignment

Align playback head height, azimuth, and lateral position using specified test tapes.

3.2 Record Head Alignment

Align record head height, azimuth, and lateral position using specified test tapes.

3.3 Bias Head Alignment

Align bias head height and horizontal position using specified test tapes.

4.0 Playback Amplifier Control and Adjustment (Test Tapes)

4.1 Playback Amplifier Control

Check playback amplifier frequency response and channel balance using test tape No. 3.

4.2 Playback Amplifier Adjustment

Adjust playback amplifier output levels to 1.3V using test tape No. 4.

5.0 Record Current and Indicator Adjustments

Record Current (A-B Test) & Indicator Calibration

Adjust record current and electronic beam indicators using A-B test procedures.

6.0 Head Alignment Without Test Tapes

6.1 Playback Head Alignment (No Test Tapes)

Align playback head height, azimuth, and lateral position using visual and meter checks.

6.2 Record Head Alignment (No Test Tapes)

6.3 Bias Head Alignment (No Test Tapes)

6.5 Track Control Procedures (Model 64x)

6.5.1 Record Head Track Control

6.5.2 Erase Head Track Control

6.5.3 Playback Head Track Control

6.6 Track Control Procedures (Model 62x)

6.6.1 Erase Head Track Control

6.6.2 Record Head Track Control

6.6.3 Playback Head Track Control

7.0 Amplifier Adjustments Without Test Tapes

Amplifier Gain and Indicator Adjustments

8.0 Total Frequency Response Control

Frequency Response Verification

8.1 Playback and Record Amplifier Control

8.1.1 Playback Amplifier Verification

8.1.2 Record Amplifier Verification

10.0 Microswitch Adjustment for Bias Circuit

Bias Microswitch Calibration