Tandberg 3300 X Schematic 3

Page 1

Service Manual

Tape recorders
3300X/ 3400X

TAN-BERG

Page 2

GENERAL INFORMATION

Note: All paragraphs in this manual are valid for both series 3300X and 3400X except for those who are
particularly marked for a special version, example 3.8 Output Amplifiers (3400X).

C Use only Low Noise High Output Tape for recording. A good head-to-tape contact is essential for ob-
taining satisfactory frequency response and signal/noise ratio. In order to obtain the best possible results
with new tapes, these should be run through approximately 5 times in drive mode in order to polish the
surface of the tape. Always check that heads and tape guides are clean. For cleaning purposes, use a
special liquid such as Tandberg Professional Tape Head Cleaner or pure alcohol or benzine.

0 In order to make magnetized parts of the tape visible, dip the tape in Magna-See, a mixture of iron
oxyde powder and alcohol. Iron oxyde powder can be obtained from our service department.

0 Heads, tape guides and capstan must be degaussed both before and after adjustment of heads and tape
guides. Move the degausser slowly past the head gaps at a very short distance, but without touching the
heads. Then hold the degausser close to the capstan for a few seconds. Start the tape recorder and hold
the degausser just above the flywheel.

Note: Do not switch off the degausser until it is at a distance of about 1 meter (3 feet) from the tape
recorder.

0 Perform the adjustments in the same sequence as explained, because some of the adjustment procedures
assume that the previous adjustments have already been performed. If not otherwise specified, make all
adjustments at 7V2 ips.

C For checking and adjustments of heads and tape guides, only the head covers need to be removed. For
electrical adjustments also the cabinet and the bottom cover must be detached. Removal of the top plate
will usually only be necessary for checking and adjustments of clutches and other parts in the drive
mechanism.

0 Removal of Cabinet and Bottom Cover
The cabinet is attached with 6 screws, 2 on each side and 2 on the front. When these are unscrewed, pull
the cabinet walls off the chassis. Removal of the cabinet walls is unaffected by the top and botton covers.
The bottom cover i attached with 6 screws which must be unscrewed before removal.

0 Removal of Top Plates

Remove the head covers by pressing the spring-
Ioaded buttons and lifting the covers off. Then re-
move the speed selector knob, knobs for input level
and output level, start/stop knob, sound on sound
knob, bass/treble, and the operating lever knob.
The knobs are retained by springs and can be pulled
straigth off. Unscrew the 10 screws shown in figure.

0 For ordering of parts see separate Illustrated
Parts List.

Fig. 1. Top plate screws.

Note: In any communication pertaining to the equipment, please specify type and serial number.