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- TANDBERG
PowerAmplifier
3003
Diagran
Circuit and
Alignment
lnstructions
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TANDBERG The European
Alternative
A L L B O A R D S R E S E E NF R O MT H E S O L D E R I D E
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Outputpoweramplifierboard
Adjustments
Ouiescent
current Peakclipping
Test condition: Connect an oscilloscopeto left/right speaker
Approx. 10 min. warming up time from cold con- output across8 ohms load.
dition without signal applied.
Apply a I kHz signaland drive the amplifier to
Connect a VT\M acrossR203/R204 for left/ just below clipping point.
right channelsrespectively,
i.e. between the top
terminals of R203 and R205/R204 and R206, Adjust R127/R128 (r ) r" that the PeakClipping
seefigure. indicators on the front lights up. Then fine adjust
the potentiometers down until the lights just goes
Adjust Rl17/R118 (t) for 40 mV readingon the off.
VTVM.
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rd> FRONT
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O Q u i e s c e nc u r r e n t
t O P e a kc l i P P i n q
xt. Circuit diagram
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E l - 9 L ALL TRANSISTORS
ARE SEEN FROM
2SA8l8Y MJE t5030/31
BF 381 U N O E R EA T H
N
Dismantling
o Top cover,rear (1) o Front panel (4)
o Top cover, front (2) a Bottom cover (5)
o Rear panel (3)
Dismantling the rear and top coaers-
5
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Dismantling the front and bottom coaers'
Servicehints
Checking the shortcircuiting protection circuit
Connect an oscilloscope acrossR203/R204 for Apply a signal of 0.1 V to the input terminals.
left/right channelsrespectively,i.e. between the
top terminalsof R203 and R205/R204 and R206 The oscilloscope
should then show the following
seerrgure. picture:
Shortcircuit the output terminals 1+ to -).
rI> FRONT
R207| 20a
nnnnnnnn
Checking the shortcircuiting protection circuit.
Checkingthe speakerprotection relay What to check after replacementof power
transistors
If some fault occurs in the output power circuits,
causingd.c.-voltages the speakeroutputs the
at After having replaceda defective power transistor
relay should disconnectthe speakers prevent
to the following components should be checked
damage. with an ohmmeter and replaced if necessary.
Disconnect white wire from the output transis- The component numbers refer to the left channel.
tors at terminalJ311, seefigure.
Disconnectspeaker
load. R157/159 Ql09
R 1 6 11 6 3
i Qr23lr25l1r5lrr7
Apply 6 to 8 V d.c. (+ and - alternately) to R20el21r 1213l2r5 cR109-117
J311. The relay shouldthen open. R201120312051207 cR121/123
The power supply board seen front
the combonentside.
TandbergPower Amplifier TPA 3003
Technical Data %dilonion ,-
ll:
0.1-o+ E
rminals. i + F
Pows. rgquiiemonts: 1 1 5 1 2 3V t
0 10%,50/60H2
0 , 0 5 - " { FL
5+
ollowing
't Ji
Powor con$mption: 50-770W
JT
0,02 - 1+ 1+
Dimonsiom: widrh: 17 1/8" ( 4 3 . 5c m ) I I:l
-tt I E T-
Deprh: 13 %" ( 3 5 . 0c m )
( 8.3cm) 0.0'l
Height: 3 7." . + +E
7+
Weight: 25 lbs ( 11. 3 k g l clr
o,oo5- l-
"t f
'T
'T
O,OO2-,i
l:
I
II
- ,+
o,oo1 +
TechnicafData accordingto IHF-A-2O2,1978 ttltr
250mw lw low loOW 15ow/8ohm.
Continuous Avs?agePower Output:
(8 ohms, 20 - 20.OOO z, THD ( O.OZ'6)
H 2 x 15OW
Total harmonic distortion uersusoutput pouer
Dynamic Headroom: 0 . 3 5d B
Frequoncy Response: 2 0 - 2 0 . 0 0 0H z ,+ O l - O . 2d B
RONT
Sensitivity:
A-wighted Signal-to.Noiss Ratio : Other Technical Data
(Ref.1W/8ohms) 98 dB
Frequsncy Besponr: 5 - 1 0 0 , 0 0 0 z .+ 0 i - I . 5 d B
H
Output lmpodance l2O - ld)O Hz): 0.04 ohms
Slew rate: ) zo v/us
A-woightod Signal-to-Noiso Ratio :
't dB
SecondaryDisclosures { R e f. 1 5 0 W / 8 o h m s ) 20
Clipping Haadroom: 1.O5
Output lmpedance (2(, - 2O,0OOHz): 0.O8 hms
o
lr O Specifications are subject to change for funher improvemenr
Wideband Damping Factor: 100 without notics.
Low Frequency Damping Factor: 200
transistor
necked SMPTE I ntermodulation Oistortion : o.o20/"
essary. lH F Intermodulation Disto.tion: o.o2%
Transiant Overload Becovery Time: lmmeasurable
t channel.
Boactivo Load Factor: 1.2
Roactivo Load Rating; 0.8dB Optional
Extras
'1151117 Saparation: )zsoe - Black acrylic side walls for freestanding units.
I
Differencs of Froguoncy Rasponse:. ( o . ro e - A t t a c h m e n t s s t sf o r i n s t a l l a t i o ni n 1 9 i n c h r a c k s
J
TANDBERG
TheEurooean
Alternatrve
Tandberg N-Oslo6, Norway
A/S, PostOffice Box 55, Bogerud,
1724-5 -80 PartNo. 714134
Printedin Norwayby Reclamo
A/S
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