Tandberg-TPA-3003-Service-Manual电路原理图.pdf

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1、- TANDBERG Power Amplifier 3003 Circuit Diagran and Alignment lnstructions rr.Gw*Bs I .J .td ! a . t. trmti E TANDBERG - The European Alternative RadioFans.CN 收音机爱 好者资料库 I ili I;l fi J o*,.-o d JTTlTrl *, ro Fr 1n, grc l= t lElv rrIETgr c; Ftij lri,r *|t|fjff iir ; ,. I t :. l,H_*f fit hlf P ; HFtfT

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4、B .1_J R 20!t21 0 + - tt . T E I efQ FRONT l_J t_Ji t_i L_l Li r_i l-l r-l l-l l-lMeasuring p oint, quie s cent current. -l rtzr i w ; : R i z i I J 1 O 3 | l-.1., POWER AMP. LEFT : ll+rii ; o l - I T q d qq t l :l r- pA iI OT OT l l II :1V :34.6V/Bohms I ,1= ls f rt Tll I I OUTPUT I POWER t- - - -

5、A A 100s I I l : - i ogggn_ryP RIGHT _- -J I l_ ;= - 6 7 V I I I I I I I T It il il ll ri ll rl xt. Circuit diagram O Quiescent current O Peak cliPPinq a,- l*,0, :,: l=/g .ri- -+*r rli ri !-Ji ,;1 L_.1 POWER SUPPLY B E l - 9 L 2 S A 8 l 8 Y BF 381 c MJE t5030/31 ALL TRANSISTORS ARE SEEN FROM UNOER N

6、E ATH - - -,:9il Dismantling o Top cover, rear (1) o Top cover, front (2) o Rear panel (3) Front panel (4) Bottom cover (5) o a Dismantling the rear and top coaers- 5 4 4 lt- l= t- I-IIOH H Z 15 t L l I t - - - I_- = i,- _-F - l r I s, - - -/ - i . + l - =t-: Dismantling the front and bottom coaers

7、Service hints Checking the shortcircuiting protection circuit Connect an oscilloscope across R203/R204 for left/right channels respectively, i.e. between the top terminals of R203 and R205/R204 and R206 see rrgure. Shortcircuit the output terminals 1+ to -). Apply a signal of 0.1 V The oscilloscope

8、should picture: to the input terminals. then show the following rI FRONT R207 | 20a nnnnnnnn Checking the shortcircuiting protection circuit. Checking the speaker protection relay If some fault occurs in the output power circuits, causing d.c.-voltages at the speaker outputs the relay should disconn

9、ect the speakers to prevent damage. Disconnect white wire from the output transis- tors at terminalJ311, see figure. Disconnect speaker load. Apply 6 to 8 V d.c. (+ and - alternately) to J311. The relay should then open. What to check after replacement of power transistors After having replaced a de

10、fective power transistor the following components should be checked with an ohmmeter and replaced if necessary. The component numbers refer to the left channel. R157/159 R161i 163 R20e l21r 1213l2r5 R201120312051207 Ql09 Qr23lr25l1r5lrr7 cR109-117 cR121/123 The power supply board seen front the comb

11、onent side. rminals. ollowing RONT lr transistor necked essary. t channel. 1151117 I J Tandberg Power Amplifier TPA 3003 Technical Data Pows. rgquiiemonts: Powor con$mption: Dimonsiom: 1151230 Vt 10%,50/60H2 5 0 - 7 7 0 W widrh: 17 1/8 (43.5 cm) Deprh: 13 % (35.0 cm) Height: 3 7. ( 8.3 cm) Weight: 2

12、5 lbs (1 1 .3 kgl 2 x 1 5 O W 0.35 dB 20 - 20.000 Hz, + Ol- O.2 dB 98 dB %dilonion ,- l l : 0 . 1 - o + E i + F F 0,05- 5+ L t Ji J T 0,02 - 1+ 1+ I I:l I T- 0.0l -tt E . + E 7 + + c l r o,oo5- t l- Tf T l: O,OO2-,i I II o,oo1 - ,+ + Technicaf Data according to IHF-A-2O2,1978 Continuous Avs?age Powe

13、r Output: (8 ohms, 20 - 20.OOO Hz, THD ( O.OZ6) Dynamic Headroom: Frequoncy Response: Sensitivity: A-wighted Signal-to.Noiss Ratio : (Ref. 1W/8ohms) t t l t r 250mw lw low loOW 15ow/8ohm. Total harmonic distortion uersus output pouer Other Technical Data Frequsncy Besponr: Output lmpodance l2O - ld)

14、O Hz): Slew rate: A-woightod Signal-to-Noiso Ratio : Ref . 150 W/8 ohms) 5 - 100,000 Hz. + 0i -I .5 dB 0.04 ohms ) zo v/us t 20 dBSecondary Disclosures Clipping Haadroom: Output lmpedance (2(, - 2O,0OO Hz): Wideband Damping Factor: Low Frequency Damping Factor: SMPTE I ntermodulation Oistortion : lH

15、 F Intermodulation Disto.tion: Transiant Overload Becovery Time: Boactivo Load Factor: Roactivo Load Rating; Saparation: Differencs of Froguoncy Rasponse:. 1.O5 0.O8 ohms 100 200 o.o20/ o.o2% lmmeasurable 1 . 2 0.8 dB )zsoe ( o.r oe O Specifications are subject to change for funher improvemenr without notics. Optional Extras - Black acrylic side walls for freestanding units. - Attachment ssts for installation in 19 inch racks TANDBERG The Eurooean Alternatrve Tandberg A/S, Post Office Box 55, Bogerud, N-Oslo 6, Norway 1724 -5 -80 Part No. 714134 Printed in Norway by Reclamo A/S