Tandberg 14 15 Service Manual

Page 2

Contents

1.0

2.0

3.0

4.0

5.0

Technical Specifications
1.1 Standard Model
12 SL Model
1.3 GT Model .

Operating Controls .........................

Connections .................................
Mechanical Description and Adjustment Proce-

dures
4.1 The Operating Lever ...............
4.1.1 Eccentric Segment (990203) .
4.1.2 Pressure Wheel Arm (990202)
41 3 Operating Arm (248186) .....
Turntables
4.21 Supply Turntable for Series 14 (990226)
4.22 Supply Turntable for Series 15 (990226)
4. 2.3 Tape Tensioner ......
4 2. 4 Take- -Up Turntable (990227) for Serles 14
4.2.5 Adjustment of Turntables
Clutches
43.1 Neutral
43.2 Normal Forward Drive ..
4.3.3 Fast Forward Winding .. ..
4.3.4 Fast Reverse Winding ................
4.3.5 Free ................................
Motor Pulley (254040) for Series 14 ........
Motor Pulley (243940) for Series 15 ........
Drive Belt (213997) ........
Transfer Wheel (990233)
Lifting Arm (990201) Series 14 .
Lifting Arm (990201) Series 15 .....
Flywheel (990312) with Capstan . .
Speed Selector, Series 14
Speed Selector, Series 15
Instantaneous Start/Stop Mechanlsm

Pressure Pad Spring (Original Version)
Pressure Pad Spring (Modified Version)
End Stop Mechanism
4.16.1 Neutral
4.16.2 Normal Forward Drive
4.16.3 End Stop or Tape Break
4.16.4 Free
4.16.5 Tape Feeler Tension .......

4.2

4.3

4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
4.16

Electric Circuits
5.1 Line Amplifier .
5,2 Microphone Amplifier
5.3 Buffer Amplifier ......
5.4 Equalizing Amplifier
5.4.1 Equalizing Network for Recording

5.4.2 Equalizing Network in Playback Mode.
Playback Booster
Indicator Amplifier
Oscillator
Output Amplifier ..

Power Supply and Voltage Regulator

5.5
5.6
5.7
5.8
5.9

10

7.0

8.0

9.0

5.10 Heads and Track Selector .................
5.10.1 Position DUO
5.10.2 Position NORMAL
5.10.3 Position EXTRA

5.11 Function Selector

Alignment of Tape Path and Electric Circuits
6.1 Tape Guide Posts ..................
6.2 Record/Playback Head
6.2.1 Initial Lateral Adjustment
62.2 Height Adjustment
6.2.3 Azimuth Adjustment ..................
6.2.4 Final Lateral Adjustment
Erase Head
6.3.1 Height Adjustment ..
6.3.2 Azimuth Adjustment ..................
6.8.3 Lateral Adjustment
Track Control
6.4.1 Visual Track Control, 2-Track Model
6.4.2 Track Control with Test Tape, 4~Track
Model
Height Adjustment of Record/Playback
Head by Track Measurement on

4»Track Model

6.3

6.4

6.4.3

6.5 Bias Current ..
6.5.1 Oscillator Frequency, 2~Track Model ..
6.5.2 Oscillator Frequency, 4~Track Model ..

6.6 Record Current and-Record Level Indicator..

6.7 Verification of Frequency Curves

6.8 Distortion Check .............

6.9 Output Amplifier ..........................
6.9.1 Output Symmetry ....................
6.9.2 Quiescent Current ..................
Special Versions ...................
7.1 Model 15 SL
711 Playback Amplifier
7.1.2 Mechanical Interlock

Model 15 GT - Group Trainer
7.2.1 Input Amplifier .........
7.2.2 Output Amplifier ....................
7.2.3 Programme Amplifier ........
7.2.4 Adjustment of Signal Levels .
Model 15 F
7.31 Mechanical Operation .
7.3.2 Electrical Operation ..................

7.2

7.3

Modifications ................................
8.1 Circuit Modilication for Low Noise Tape
8.2 Modification of F~ModeI from Serial

No. 2 510 020 ............................

8.2.1 Microswitch for Oscillator Voltage

8.2.2 New Microswitch .

8.2.3 Rewiring ............................
8.3 Modification from 2-Track to Full-Track Model
8.4 Modifications 50 to 60 Hz or Vice Versa
Parts Lists ...................................

25
25
26
26
26

27
27
27
27
27
27
27
28
28
28
28
28
28

28

28
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28
28
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28
29
29
29
29

29
29
29
29
30
30
80
30
30
30
30
31

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Page 6

NORMAL: Record/playback upper track. Lower track to FREE HD.
EXT: Record/playback lower track. Upper track to FREE HD.
DUO: Mixing of upper and lower tracks in playback.
8. Start/stop lever. For instantaneous start or stop in normal forward drive.
9. Microphone socket
10. Record level meter.
11. Record level control for line input.
12. Record level control for microphone input.
13. Output level control.
14. Treble control.
15. Bass control.
16. Speaker selector with three positions:
INT: Internal speaker only.
EXT: External speaker only.
BOTH: Internal and external speakers.

17. Dust covers that can be removed for cleaning of heads and tape path.

3.0 Connections
3.1 ALL MODELS 3.2 MODEL 1SSL

MIC

1-

Shlelded microphone cable

-
To recorder or amplifier
\ D
\l
I From radio
=1-
3.3 MODELS 156T, MASTER AND 1-10
<-
\
:1 From pick-up
I
<-

Fig. 3.1.