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Service Manual 400RB-III Series

1. LTR ECO No APPROVED _ DATE N _ lt _1 60V 10 R33 cg 1 65V 1 6v 47 apy C16 R14 R16 RU R25 102 1 00K 1 00K 100K 470 um 50v si Xo RIS 2SA1380 150 2 09 03 2SA1376 1 1 2SA1376 a 3 3 1N4004 4 5 56 B B 54V 2564793 2 2 2 02 R3 5 10 1 EM 50 Bava is 3 V 022 021 020 FAULT PGND R45 22565242 25C5242 2 2SC5242 5 10K 1 1 1 5 van 07 3 3 P RI9 Cy Q4 INPUT 1kHz SINE 100mV 19 9dBV 28C3381 R52 R51 R50 2 2K 3 es 2 6 C24 PGND bj 22 22 di i ND HI CURENT pit 50 ae S 10 2W 2W 2W u ZEE TA 105 00 7 500v R55 R54 R53 TT 1 3 22 22 22 RIB 4 525 R41 R49 2W 2W 2W 1 27 212 ok R3 100 25y 1 0 OHM 50V 2 55 E 680 1 4W R20 R35 2 2K 4 3 74K PGND CURRENT L 15 RIO RH 2 104 MUTE 75 12 1 1 00K 018 B Ces 20v cn 104 R46 1 107 025 024 023 100V ae 290 5 52541962 3 2541962 2541962 IL AGND PGND 5 SESS pH 2 6V P 1 57 016 1 00k PGND ge nj e 184148 5 1 AGND
2. CON TIED Ero 5A 120V 5AT 100V 2 5AT 230V P6 FUSESMM 1 1 1 2 BLACK BLACK BLACK 3 4 A x 1 T2 WHITE WHITE cso 2 103 1 vioLer 120 250V 2 T VIOLET VIOLET VIOLET A rt 3 2 3 1 22 5 5 BLACK feren Ic BLUE 2 GREEN 120 1 no TS WHITE BLUE YELLOW orange 100 2 1 T6 ORANGE YELLOW 2 z 1 T7 YELLOW YELLOW GREEN BROWN AT 2 1 T8 ORANGE NC ORANGE 2 1 T9 BLUE BLUE NC 2 1 TIO RED RED RED 2 1 Brown BROWN BROWN 2 15 lt R22 RI 10k 100k R2 100k R4 amp gt 10 0K l 14 m EET 105 1 0 50v 5 56 j 356 25v S aE es 2 3 Wi i MUTE R23 MPSAO6 06 gt lt MPSAO6 1N755A e 2 1 vw 1N4148 cs 850 1 50V 104 R24 103 50v 750 08 1N4148 m 470 1 4W GRN PGND 1 4W RED POWER ON PROTECT zs FAULT lt 6ov 35V R58 e e P2 1 2 49K 98 15V 2SC4793 R43 2 2 2 27 R29 n 129 20K 14148 141748 say D3 D4 I I Be 1 965 107 T Ree hs 10 0 AGND 2 AGND R57 10 0 AGND PGND co tL D6 1N965B 107 50v m 50v Dn D5 e 1N4148 1N4148 R30 D 20K 1 63V 016
3. 3 a Low Noise Operation The 400RB Series uses a high gain high headroom low noise input stage It has such a large dynamic range 60 p p that very few instruments overdrive it Even most basses with active electron ics do not need the input attenuator to be set The benefit to you is less hiss from your horn and overall less noise In Closing should now have a thorough understanding of how your new 400RB Series amplifier works and what advantages it can offer you in getting your sound VE thank you for reading the Owner s Manual and wish you the best of times Please send us your comments wwwgallien krueger com or email us at sales gallien com 400RB Series Block Diagram WOOFER MASTER 0 1 RETURN SPEAKER OUTPUTS E E E 8 400RB Series Specifications Output Power 240W Amplifier Input Section Maximum Input Level With 10dB pad Input Impedance Send output impedance Return input impedance Tuner Output Impedance Direct Output Impedance Equalizer Bass Lo Md Hi Md Treble Vicing Hlters String Bass Button Contour Presence Noise Cooling Amplifier Protection 150W 8 Chms 240W 4 Chms 0 6V Rms 1 6VRms Om 220 Ohm 50k Ohm 10k Chm 500 Ohms 10db 60Hz 6db 10dB 250Hz 6db 10dB 1kHz 14db 7kHz 11db 20Hz 2db S0Hz JOdb 2500EZ 3db 7kHz 9db 10kHz 90db referenced
4. 405 0120 D TOP SIDE SILKSCREEN 145 0120 D REV D 5120D sst0126 pho GERBER FILE NAME 8 00 01 07 IIAN IP 555 QE sr 159 OOOO OOO e 59289 Ga y 2240 PARAGON DRIVE TECHNOLOGY SAN JOSE 95131 LAYER DESCRIPTION m Sz 400RB PRE AMP BD DESIGNED R G 1 6 98 SIZE DRAWING NO 405 0120 D REV TOP SIDE ROUTING Seys PART NO 145 0120 D D ELEC KR 6 9 98 FILENAME GERBER FLE 07101 5120D P RENE SCALE KESET JiYooloMos MIAO J2 e e 31v9S s i 10015 ame 3 04000110 mw 38439 0Z10 Sy CEE EE 4 0N ldyd Ad 0 0010 507 0N 9NIMYSQ g sn uu ONILNO 2015 011098 08 dAV 33d 88009 0119142530 33AV1 16166 Y3 3S0f NYS 125191 HE H NOOVEVd 0922 7 2 C46 C48C49 e 75 015 014 2 s nee me J e nee e
5. Turning up the Boost control will add a little grow to your tone This is an unmistakable GK trade mark sound that you will grow to appreciate Raising the Boost while lowering the Master will add more grow while keeping the sound level the same Grow is actually a small amount of even order harmonic distortion that sounds great through a woofer For most playing situations the Master is set between 12 amp 3 o clock The cleanest sound is obtained by setting the Master above 12 o clock and going above 3 o clock for maximum power situations Direct Out The 400RB provides a low noise high quality balanced direct out for connection to PA and record ing consoles With the Pre Post switch set to Pre Out the direct output signal is fed directly from our low noise high headroom FET input stage providing a low noise output superior to external direct boxes and impedance transformers The Direct Output signal is only effected by the 10dB Pad and Tuning Mite controls This allows you to adjust your tone and volume on stage without changing the Direct Out signal level and confusing your sound man Changing the Pre Post switch to Post In sends the GK sound and preamp response to the Direct Out jack This gives you complete control over the Direct Qut s tone and volume In addition Ground Gnd Lift switch is included to remove hum and buzz when connecting to equipment powered by a different ground s
6. 54 2 15 P2 4 27 35V R59 P2 5 2 49K lt 50v PGND 60V TEMP SENSOR is 025 0 33 1 35 OU Q26 2SA1837 5 15V gt RED P4 2 1 PGND FAN P4 1 R31 BLK 100 PGND PGND 400RB Ill POWER AMP BOARD TITLE DRAWN DATED CHECKED DATED CODE SIZE DRAWING NO REV QUALITY CONTROL DATED RELEASED DATED SCALE SHEET 2 OF 2 REVISION RECORD LTR NO APPROVED DATE 95 0 63 4 SS 959 000 829 ial 194 0 ocd 2 vea a 624 42 r 929 029 619 sa Ty 49 aS 19 lo ay a 19 su Q yia 00 OLY 894 Ord se 22 En 209 ocd 129 2 za 90 aly 393nd N3mTY9 2240 PARAGON DRIVE SAN JOSE CA 95131 R DESCRIPTION BD
7. For some playing styles you may vant it in even with a four string instrument at least now you have a choice G LV E Technology As in all GK pre amps the 400RB Series pre amp incorporates what we call GI VE Gate Induced Valve Effect Technology W use field effect devices with the gate biased in a way that emphasizes the optimum harmonic content of the signal 13 Cool Running Reliability To cool the 400RB we ve designed a temperature sensi tive fan cooling system When the amp is under a light load the fan is off or running at a low speed reducing fan noise As the amp works harder the fan speed increases to keep everything cool Smart Protection Circuitry 400RB s protection circuitry constantly monitors for unsafe operating conditions such as short circuits miswred speaker cables blown speakers improper ventilation and incorrect speaker configurations In addition protection is provided during power up power down If the 400RB senses any unsafe operat ing conditions the output signal is immediately muted and the power light changes from Green to Red The amplifier will remain muted until the fault is removed If the protection circuit activates while playing turn the amplifier off and check the ampli fier speaker output connections Be sure that you are not exceeding the maximum recommend load described in this manual the problem persists contact GK directly for technical advice
8. T1072 PRE POST R2 AGND 106 R75 13mV 212 6 o3 R10 MV 1 fsa 100K rook 5 I MASTER ou 4 1 lt 15V C49 gt g PRE 472 sov 7 D14 012 12V 12V 1 759 1N759A NOTES UNLESS OTHERWISE SPECIFIED R55 470 35V MH 125NP 125 125 i 1 1 Caps marked with an are Nos uis 04 1 t UX Qu YX xs 12V 2 12V not loaded into the PCB C14 15 and 16 14759 Pasa C37 335 220 AGND AGND A 6 50v 50V Di 2 test point voltages are in RMS 57 e lt 2 PGND m A with 200 Hz 2 mV 55 9 dBV sine wave input zg 7 PROTECT MHAZ5NP MA ZEND J4 3 UX X5 3 CONTOUR and PRESENCE on zero off py pono s e Switches out all tones boost and volume on 10 8 8 has COMPANY GALLIEN KRUEGER c5 220 50v 406 0122 aa doc 0 400RB PRE AMP ASSEMBLY 51 DRAWN DATED 4 5 1 2 1 ae ee ied J CALLAGHAN 5 19 99 3 4 11 2 CHECKED DATED CODE SIZE DRAWING NO REV FOR POWER SWITCH BOARD QUALITY CONTROL DATED C De Tes D RELEASED DATED 6120D SCALE SHEET 1 OF 4 5 9 10 Lc nui 0S 0002 9 1 REVISION RECORD
9. On when tuning up No signal will be sent to the speakers or the PA system 5 Volume Sets pre amp gain after the input stage It is used in conjunction with the input pad to optimize the amplifier s headroom 6 Voicing Filters String Bass Setting this button voices the pre amp for basses with B tuning Leave it out and the amp is voiced like the 800RB for 4 string basses Contour Drops the mid range frequencies while boosting lows amp highs Presence Adds edge and definition to higher frequencies Active Equalization 7 Treble Boost and cut at 7kHz 14dB shelving type Add or remove edge and definition 8 Hgh Md Boost and cut at 1 kHz 6dB 10dB Optimized band pass type Works on lover string harmonics and effects the punch of your sound 9 Low Mid Boost and cut at 250Hz 6dB 10dB Optimized band pass type Works on the main body of your sound 10 Bass Boost and cut at 10dB shelving type Controls low end push Outputs 11 Boost Apost EQ gain stage using GIVE technology which adds as it is turned up 12 Master Controls output level of the amplifier 13 Effects Loop Send and return jacks provided for the insertion of effects after the but before the boost section Some effect units have gain turning the BOOST down will compensate for this 14 Tuner Output Output to tuner 15 Power Switch Turns the amplifier on or
10. s 4 Q2 01 D8 9 GREEN ml 100k MPSA56 13 SIDE VIEW R66 BOTTOM VIEW LED AGND c19 50V 50V 104 TUNER t HI MID LOW MID J6 100K 50KB 2mV R3 R38 y R28 35V J9 3 a 54 4 S K AGND e C18 E m RIT 12K 152 M C29 472 47K 5 6K 1 PRESENCE 101 Toov 5 6K AGND MESA C36 S C32 25V 1 106 12 2 Q2 m CONTOUR 106 0 1106 J406 1406 104 2KB il seul c44 1 Q3 A D 2 5 D 50 5 6 Ree M 104 25V 43mV 3 50V C30 50V 106 3 43mV 2p sr 1 VOLUME 47K 519 055 u3 40mV s SE 210mV 3 6 100K R61 C16 106 d see Us ie c39 SOKA C28 H Opt TLO72 56K TLO72 6 8K C24 12V caz pa m sov ud CH lt us 17594 11 11 NA A 3 v sek 222 R71 P assasi 50V 10PF 1 759 M 50V 100V Dii 15K 190 50mV E 12 v R68 e 15 1N759A 928 3 A R69 12V r 07 p 1 759 M C43 R58 gt Sr st TREBLE E 226 4148 i per 50V 561 15V 1N414B TE 27 5 Somy 3 43 zi 6 11072 9 2 4 2 R64 590 2 04 7198mV 4 C4 4 5 d T 2 2 RETURN L_1 2 Sa SEND RAS 224 R44 9 50V 2 2K RB R47 12K 1 0K t 7 CLIP R4 RED 12K RIS 09 1 35mV 11 106 220 25V PGND R7 N xc BT R2 1506 106 c9 3 D 2 2K 104 25V GROUND LIFT DIRECT OUT Gy os soe ap a 35mV 106 UI A gt 5 6 2 Eu R76 R74 R73 1986 RS 2 s t t 100 1 022 2 CIO 336 1 x 4 1 00K 12 1K 12 1K 25v 56 TLO72 6 55 AGND C46 13 L 5 8
11. 1 R50 1 R62 1 R64 2 R75 76 2 R73 74 1 R37 1 R61 volume pot 6 R14 21 28 38 43 51 boost presence EQ s 2 R6 56 master contour pots 1 S1 power swich 5 S2 3 4 5 6 all switches 2 J1 2 4 J6 7 8 9 tuner input send return jacks 1 J5 direct out jack 1 J3 1 J4 3
12. PERSONNEL The lightning flash with arrowhead The exclamation point within an symbol within an equilateral triangle is equilateral triangle is intended to intended to alert the user to the alert the user to the presence of presence of uninsulated dangerous voltage important operating and maintenance within the product s enclosure that may be of servicing instructions in the literature sufficient magnitude to constitute a risk of accompanying the appliance electric shock to persons WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE CAUTION TO PREVENT ELECTRIC SHOCK MATCH WIDE BLADE OF PLUG TO WIDE SLOT FULLY INSERT ATTENTION POUR EVITER LES CHOCS ELECTRIQUES INRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU AU FOND Gallien Krueger 2240 Paragon Dr San Jose CA 95131 phone 408 441 7970 fax 408 441 8085 www gallien krueger com 400RB Series Congratulations Your purchase of a new Callien Krueger 400RB Series product is surely the result of much careful consider ation on your part For our part we at Gallien Krueger are pleased that you chose us and are determined that you will be a satisfied customer In choosing a 400RB Series product you own an amplifier with many unique features that can take you where you have never been before get the most out of your new purchase please take a few minute
13. TERM CRIMP 1 22GA 093 0509 HEAT SHRINK 3 16 IN INSULATOR TAPE 1 X7MIL ADHESIVE BACK INSULATOR 9MIL TO 126 GRY GREASLESS BOLT 4 40 1 3 8 PHP ZINC WASHER 4 SPLIT WASHER 4 FLAT CAD TR BOLT 4 40 3 8 PHP CAD TR BOLT 4 40 1 2 PHP CAD 700 400RB HEAT SINK LABEL BLANK 9 X 25 WIRE ASSY 14GA GRN 3 CHASSIS GROUND 400RB IIl POWER AMP BOARD ASSY 206 0120 D 400RB III Preamp Assembly DESCRIPTION TLO72CP LOW NOISE JFET OPAMP QTY QTY QTY REF DESIG R35 R41 R24 R21 L1 J1 J2 T1 2 3 4 5 6 7 8 9 10 11 J3 4 P4 P1 P5 P2 F3 REF DESIG 014 013 For fan wires for 093 0508 0 Around fan cable Q13 14 Fan to heat sink 4 fan heat sink 14 transistors bd fan to heat sink output transistors board to IEC ground terminal REF DESIG U1 2 3 4 5 LVL PART 2 010 1013 0 2 010 2010 0 2 010 2040 0 2 020 0120 0 2 020 1000 0 2 025 0012 0 2 025 0101 0 2 025 0116 0 2 030 2102 0 2 030 2103 0 2 030 2104 0 2 030 2221 0 2 030 2222 0 2 030 2224 0 2 030 2470 0 2 030 2472 0 2 030 2561 0 2 030 4100 0 2 030 4101 0 2 031 0106 1 2 031 0107 0 2 031 1336 0 2 031 2106 0 2 031 2227 0 2 031 2335 0 2 050 1001 0 2 050 1002 0 2 050 1003 0 2 050 1004 0 2 050 1005 0 2 050 1203 0 2 050 1503 0 2 050 2201 0 2 050 2202 0 2 050 2203 0 2 050 2204 0 2 050 2205 0 DESCRIPTION MPSA56 PNP 80V 500MA TO 92 J113 N J
14. gt 2 Q28 500 3 MPSAOS 017 184148 5 012 12V 1 i 012 T 2 5 3 20 014 C23 2 144004 151 Q19 500V 2SA1837 V 6v R48 PGND R42 R39 180 10K 470 24 253478 2 Vw Q10 3 2835022 1 m PGND 3 D13 R27 1N4148 150 1 55V xov 3BV C21 R26 RAT R38 102 ook 470 47 SOV e R40 x is PGND POWER GROUND NOISY NOTES UNLESS OTHERWISE SPECIFIED sell RONDE EN ALOE GROUND AED FOR PANEL 1 TEST CONDITIONS 100mV 1kHz SINE MHI2SNP MH 25NP COMPANY 1 1 xn cc M 04 400RB lll POWER BOARD PCND uj x4 ESN 125NP Tm H x X1 Af x X2 i 2 DENOTES RMS AC VOLTAGE B 9 DRAWN DATED MH 125 220 BIAS ADJUSTMENT PROCEDURE UX X3 CHECKED DATED CODE SIZE DRAWING NO REV WITH POWER OFF ADJUST POT R21 TO FULL COUNTER CLOCKWISE POSITION 8 X7 TURN ON POWER AND WAIT 5 SECONDS FOR TURN ON DELAY e e ieee MH 200V MH 200V TURN R21 CLOCKWISE UNTIL VOLTAGE ACCROSS P3 READS 5 mVDC 154 100 X5 RELEASED Shieh SCALE SHEET 1 OF 2 1 N WARNING Z DANGEROUS VOLTAGES PRESENT IN THIS AREA REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS 2 UL 7 5 2 5 125 C32 0 1UF 250V
15. to 240W weighted Continuously Variable Speed fan Full short circuit thermal amp RF protection Stable into reactive and mismatched loads Hive second muted warm up Wight US A Canada Europe Japan 14 Dimensions HxWxD Power Requirements 3 V2 x IP x8 2 Rack Spaces 15165 120V 60Hz 410W at full power 230V 50Hz 410W at full power 100V50Hz 410W at full power 400RBIII BASS AMPLIFIER TURN ON PROCEDURE SETUP 1 on zero 2 cover of amplifier removed for easy access to the amplifier outputs 3 Oscilloscope probe GND to chassis ground and to tip of 4 output jack 4 Set the volts div of the oscilloscope to 20V and the time base to 1115 5 Turn bias pot R21 on the power amp board all the way down counter clockwise 6 Connecta DMM set to 20mV scale DC to the 2 pin BIAS header on the power amp 7 Setthe VOICING FILTERS and the main VOLUME to zero all other controls to 10 and all switches OUT 8 Setthe function generator to output a 200 Hz 5mV 46 dBV sine wave POWER AMP BIAS AND OUTPUT TEST 1 With the amplifier power switch on slowly raise the Variac voltage to 60V the power LED should switch from RED to GREEN Observe the ammeter for excessive current draw idle current should not exceed 2A 2 Raisethe Variac to 120V 3 Adjusttrim pot R21 to obtain a steady 5mV reading on the DMM 4 Connect the amp output to a 4 ohm n
16. 0 2 050 4701 0 2 050 4702 0 2 050 4703 0 2 050 6801 0 2 050 6802 0 2 051 0270 0 2 051 1001 0 2 051 1003 0 2 051 4701 0 2 051 4703 0 2 054 330 0 2 055 220 0 2 055 0101 0 2 056 0100 0 2 060 1000 0 2 060 1001 0 2 060 1002 0 2 060 1003 0 2 060 1213 0 2 060 2492 0 DESCRIPTION CAP ELEC RAD 129 20 63V CAP ELEC RAD 476 20 63V 104 10 100 CAP PE 104 20 250V CAP CERAMIC DISK 103 10 X 250V CAP MICA 10PF 5 500V CAP MICA 130PF 5 500V RES CF 10 1 8W 5 RES CARBON FILM 47 OHM 1 8W 5 RES CARBON FILM 100 OHM 1 8W 5 RES CARBON FILM 10K OHM 1 8W 5 RES CARBON FILM 100K OHM 1 8W 5 RES CARBON FILM 150 OHM 1 8W 5 RES CARBON FILM 180 OHM 1 8W 5 RES CARBON FILM 20K OHM 1 8W 5 RES CARBON FILM 2 2K OHM 1 8W 5 RES CARBON FILM 3 3K OHM 1 8W 5 RES CARBON FILM 470 OHM 1 8W 5 RES CARBON FILM 4 7K OHM 1 8W 5 RES CARBON FILM 47K OHM 1 8W 5 RES CARBON FILM 680 OHM 1 8W 5 RES CARBON FILM 6 8K OHM 1 8W 5 RES CARBON FILM 2 7 OHM 1 4W 5 RES CARBON FILM 100 OHM 1 4W 5 RES CARBON FILM 10K OHM 1 4W 5 RES CARBON FILM 470 OHM 1 4W 5 RES CARBON FILM 47K OHM 1 4W 5 RES WIRE WOUND 33 OHM 1W 5 RES CERAMIC WW 22 OHM 2W 5 RES METAL OXIDE 10 OHM 2W 5 RES WIRE WOUND 1 0 OHM 5W 10 RES METAL FILM 10 0 OHM 1 8W 1 RES METAL FILM 100 OHMS 1 8W 1 RES METAL FILM 1 00K 1 8W 1 RES METAL FILM 10 0K OHM 1 8W 1 RES METAL FILM 12 1 1 8 1 RES ME
17. 2 r ee e R28 e Bee DT R43 m Ini a m a E gt E 24 a RISK OF FIRE REPLACE FUSE AS MARKED R 120V UL CSA SAL 125V 220 240V EUROPE 250V GALLIEN KRUEGER 206 0121 D L L L Gal lien 2240 PARAGON DRIVE SE ME SAN JOSE CA 95131 LAYER DESCRIPTION Wu EPROVALS TITLE 400RB POWER AMP BD DESIGNED ML 12 1 99 SIZE DRAWING NO 405 0121 D REV TOP SIDE SILKSCREEN DAME es D PARTNO 45 0121 0 LEA GERBER FILE NAME sst0126 pho RISK OF FIRE REPLACE FUSE AS MARKED 100 120V UL CSA SAL 125V 220 240V EUROPE 2 5AL 250V F3 eo 96 GALLIEN KRUEGER 206 0121 D z c e e E 1 1 1 2240 PARAGON DRIVE Ga ER SAN JOSE CA 95151 TECHNOLOGY LAYER DESCRIPTION TOP SIDE ROUTING GERBER FILE NAME QT TO T pho APPROVALS INIT DATE TITLE 400RB POWER AMP BD DESIGNED ML 12 1 99 SIZE DRAWING NO 405 0121 D REV DRAWN ES 12 1 99 ML 12 1 99 PART 145 0121 D MECH LEASED Serm e Sy Ra Je B o m pq Ga en 2240 PARAGON DRIVE TECHNOLOGY SAN JOSE CA 95131 LAYER DESCRIPTION BOTTOM SIDE ROUTING GERBER FIL
18. 210RBS 4 ORBS 115RB5 in addition to the combo detailed description of the maximum loads the combos can drive internal speaker configurations in compact enclo One 8 Ohm 12 The 400RB combo electronics are identical to the sures Speaker Configurations 400RB 112 400RB 115 ded load with the internal Maximum recommen speaker connected 8 Chm cabinet th the internal i ded load w speaker disconnected Maximum recommen Che 4 Ohm or To 8 Chm cabinets 11 x S 400RB Series Tech Talk Characteristics of the 400RB The 400RB Series is a flexible state of the art bass amplifier designed to deliver maximum performance and simple operation This is accomplished through these important features e Extremely high current power supply and power amp circuitry gets the sound out of your head Four bass specific bands of active equalization for precise tone control Three voicing filters for shaping customizing your sound Balanced direct output eliminates the need for a direct box e Continuously variable fan cooling Designed and Built in the US for years of reliability and quality service Current Output amp Bass Response When a pover amplifier is pushing several speaker cones and a high power transient like a string slap comes along the amp has to tap into a large power reserve to maintain cone control It s kind of like grabbing a swing at the b
19. 5 R2 44 58 60 R20 R40 53 R48 LVL PART 2 050 3302 0 2 050 3303 0 2 050 3904 0 2 050 4701 0 2 050 4702 0 2 050 4703 0 2 050 4704 0 2 050 5102 0 2 050 5602 0 2 050 5603 0 2 050 6802 0 2 050 8202 0 2 060 1002 0 2 060 1213 0 2 060 1274 0 2 070 1513 0 2 070 1514 0 2 070 1522 0 2 090 0007 0 2 090 0012 0 2 092 0010 0 2 092 0081 0 2 092 0084 0 2 093 0051 0 2 093 2005 0 2 100 0119 0 2 145 0120 D DESCRIPTION RES CARBON FILM 3 3K OHM 1 8W 5 RES CARBON FILM 33K OHM 1 8W 5 RES CARBON FILM 390K OHM 1 8W 5 RES CARBON FILM 470 OHM 1 8W 5 RES CARBON FILM 4 7K OHM 1 8W 5 RES CARBON FILM 47K OHM 1 8W 5 RES CARBON FILM 470K OHM 1 8W 5 RES CARBON FILM 5 1K OHM 1 8W 5 RES CARBON FILM 5 6K OHM 1 8W 5 RES CARBON FILM 56K OHM 1 8W 5 RES CARBON FILM 6 8K OHM 1 8W 5 RES CARBON FILM 8 2K OHM 1 8W 5 RES METAL FILM 1 00K 1 8W 1 RES METAL FILM 12 1 1 8 1 RES METAL FILM 127K 1 8W 1 POT 50K 15A 7MM KNURL 1W POT 50KB 7MM KNURL 1W POT 2KB 7MM KNURL 1W SWITCH 8A 128A 250V PP PCB SWITCH MINI PP DPDT 1A BRK MAKE PC TER FASTON M PC 25 JACK 1 4 MONO PC NON GROUNDING CON XLR MALE PC PL SCREW MNT HDR 2MMX2 VERT MALE LOCK HDR 2MMX7 VERT SSHROUDED SPACER LED NYLON 250 400RB III PRE AMP BOARD RAW REF DESIG 1 R46 2 R39 67 1 R52 4 R55 57 65 69 2 R13 49 5 R19 22 24 29 33 4 R18 23 26 32 1 R63 6 R9 16 17 34 36 42
20. E NAME art02 pho APPROVALS INIT DAT p TLE 400RB POWER AMP BD 12 1 99 DESIGNED ML DRAWN ES 12 1 99 ELEC ML 12 1 99 SIZE DRAWING NO 405 0121 D REV PART NO 145 0120 D MECH LEASED LVL NOTE PART 080 0043 A 091 0008 0 095 0005 0 100 0020 0 100 0029 0 100 0035 0 100 0042 0 100 0076 0 100 0098 0 100 0126 0 111 0041 0 111 0061 0 111 0101 0 111 4060 0 111 6001 0 111 7011 0 112 8060 0 112 9060 0 113 3060 0 113 8100 0 115 2220 0 115 6000 0 115 7008 0 137 0575 C 137 0593 B 137 0651 A 150 0001 0 150 0003 0 150 0019 0 150 0023 0 152 0002 0 153 0007 0 160 0012 A 400RB III INDENTED BILL OF MATERIALS Level 1 refers to main assembly numbers and level 2 refers to board level components Main asssembly numbers are in bold face while commonly used parts are italicized DESCRIPTION TRANSFORMER 400RB III 120V FUSE 5MM 5A 125V FAST UL CSA CORD IEC 3X18GA 10A 6 DOM BUMPER ROUND RUBBER 1 2 X 14 BUTTON CLYIN BLK CAP PUSH SWITCH CABLE TIE BLACK 4 18 LB HANDLE RUBBER 6 5 FOOT RUBBER ROUND 5 8DIA X 5 8 KNOB GRAY 6X15MM SPLINE SHAFT HOLDER CABLE 75 SQUARE ADHESIVE BK BOLT 4 40 1 4 PHP CAD BOLT 4 40 3 8 PHP CAD BOLT 4 40 5 8 PHP CAD SCREW 4AB 3 8 FHP 824 B Z NUT 4 40 KEP SMALL WASHER 4 TR BOLT 6 32 3 8 PHPB Z TR BOLT 6 32 3 8 FHPB Z SCR
21. EW 8AB 3 8 PHP B 0 TR BOLT 8 32 5 16 PHP B O BOLT 5 16 18 2 3 4 CARRIAGE B Z NUT 5 16 18 HEX CAD WASHER 8MM BELLEVILE SPRING STEEL 700RB 400RB RACK EAR 700RB 400RB TOP COVER 400RB CHASSIS 400RB Ill CARTON 700RB PACK BAG POLY 18X24XC 2 MIL BAG POLY 10 X 16 1 1 2 MILL BAG 4 X16 FOR PWR CORD LABEL GK SERIAL NO 400RB III OWNERS MANUAL 1 26 00 SW QTY REF DESIG 1 1 pwr switch board chassis pwr switch sink chassis xir direct out gnd terminal 2 pwr sw 3 bd chassis 4 sink chassis handle top cover pwr cord con feet transformer transformer transformer LVL PART 1 202 0050 A 1 206 0120 D 1 250 0121 D 1 602 0007 0 1 GK160 0000 1 HA202 0004 1 NI202 0100 1 NI202 0101 LVL PART 2 001 2060 0 2 010 0000 0 2 010 0001 0 2 010 0003 0 2 010 0012 0 2 010 1002 0 2 010 1003 0 2 010 1013 0 2 012 0002 0 2 012 0003 0 2 012 1002 0 2 012 1003 0 2 020 0004 0 2 020 0150 0 2 020 1000 0 2 020 1022 0 2 020 2106 0 2 023 0112 0 2 030 2102 0 2 030 2103 0 2 030 2104 0 2 030 2271 0 2 031 0106 1 2 031 1336 0 2 031 2105 0 2 031 2106 0 2 031 2107 0 DESCRIPTION WIRE ASSY 26GA BLK 17 2PIN 400RB III PRE AMP BOARD ASSY 400RB III POWER MODULE GK WARRANTY CARD GK SAFETY SHEET WIRE ASSY 26GA BLK 7 7PIN UL CSA WIRE ASSY 18GA BLK 17 5 250F 250F WIRE ASSY 18GA WHT 17 5 250F 250F 206 0121 D 400 PowerAm
22. FET 35V 2MA TO 92 J406 DUAL N CH JFET 8PIN DIP 1N759A ZENER 12V 5 400MW DO 35 1N4148 RECT FAST 200MA 100V 4NS DO 35 LED RED GRN 5MM 630NM 560NM 1 5MCD 15MCD LED GRN 3MM 565NM 6MCD 10MA 40DEG LED RED 3MM 635NM 6MCD 10MA 40 DEG CAP CER AX 102 10 50V X7R CAP CER AX 103 10 50V X7R CAP CER AX 104 10 50V X7R CAP CER AX 221 10 50V NPO CAP CER AX 222 10 50V X7R CAP CER AXIAL 224 20 50V Z5U AXIAL 47 PF 10 50V NPO CAP CER AXIAL 472 10 50V X7R CAP CER AXIAL 561 10 50V X7R CAP CER AXIAL 10 PF 10 100V CAP CER AXIAL 101 5 100 V COG CAP ELEC RAD 106 20 25V NP CAP ELEC RAD 107 20 16V LOW LEAKAGE CAP ELEC RAD 336 10 50 25V CAP ELEC RAD 106 10 50 50V CAP ELEC RAD 227 10 50 50V CAP ELEC RAD 335 20 50V RES CARBON FILM 100 OHM 1 8W 5 RES CARBON FILM 1K OHM 1 8W 5 RES CARBON FILM 10K OHM 1 8W 5 RES CARBON FILM 100K OHM 1 8W 5 RES CARBON FILM 1M OHM 1 8W 5 RES CARBON FILM 12K OHM 1 8W 5 RES CARBON FILM 15K OHM 1 8W 5 RES CARBON FILM 220 OHM 1 8W 5 RES CARBON FILM 2 2K OHM 1 8W 5 RES CARBON FILM 22K OHM 1 8W 5 RES CARBON FILM 220K OHM 1 8W 5 RES CARBON FILM 2 2M OHM 1 8W 5 REF DESIG Q2 Q1 Q3 D2 3 4 5 10 11 12 D6 7 D1 D8 D9 C1 C19 20 31 C7 13 23 28 36 44 C9 42 C21 22 24 C2 C17 C4 25 26 29 48 49 C27 C40 C18 45 C3 8 11 12 30 39 C43 C10 C32 33 46 47 C37 38 C6 34 R11 R8 R1 R3 5 7 10 59 66 67 R35 54 71 R4 12 25 27 30 31 R68 R1
23. Service Manual 400RB III Series Table of Contents Operating Instructions 3 Turn On Calibration Procedure 20 Schematics 21 Bill of Materials 22 Note As of 1 99 there are no Engineering Change Orders ECOs for this model New ECOs will be re leased as they are issued 400RB Series Owner s Manual T 24 gt gt 400RB 112 400RB 115 lt GALLIEN KRUEGER 2 8 400RB Series Table Of Contents IntroQuctiOn Quick Start Sound Lips A IN Safety Information Installation and Maintenance Front Panel Controls D Rear Panel Controls 10 400RB Series Combos 11 gt eee LZ Specifications 14 NOES LO All Features and specifications are subject to change without notice This list is subject to change without notice CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE
24. TAL FILM 2 49K 1 8W 1 REF DESIG C28 29 C1 2 18 19 C25 C31 32 C30 C24 C22 23 R32 40 R33 38 R8 9 R22 R1 2 R15 27 R48 R29 30 R19 20 R5 R25 34 39 47 R23 R3 R37 R18 R43 44 R49 R42 45 R12 13 R46 R28 R50 51 52 53 54 R60 61 R62 R56 57 R31 R6 11 14 16 17 R4 R7 10 R58 59 LVL LVL LVL PART 060 3742 0 060 4322 0 060 7501 0 070 0520 0 081 0055 0 091 1001 0 092 0001 0 092 0066 0 092 0082 0 093 0025 0 093 0051 0 093 0080 0 093 2005 0 094 0004 0 145 0121 D PART 010 0003 0 010 1003 0 086 0000 0 093 0506 0 093 0909 0 095 0006 0 105 0001 0 105 0005 0 111 0250 0 111 7011 0 111 7021 0 111 8061 0 111 8081 0 132 0024 B 153 0105 0 202 6000 A 207 0121 D PART 001 1030 1 DESCRIPTION RES METAL FILM 3 74K OHM 1 8W 1 RES METAL FILM 43 2K OHM 1 8W 1 RES METAL FILM 750 OHM 1 8W 1 POT 500 OHM TRIM VERT INDUCTOR 2UH 20A AIR CORE THRM 85C 5 0 DIFF PC CON IECX3 10A 250V PC TERM FASTON M PC 250 JACK 1 4 MONO PC GROUNDING HDR 1X2 VERT MALE LOCK GOLD HDR 2MMX2 VERT MALE LOCK HDR 156X3 VERT MALE LOCK SQR PINS TIN HDR 2MMX7 VERT SSHROUDED FUSE CLIP5MM P C MOUNT 400RB IIl POWER AMP BOARD RAW 250 0120 D Power Amp Module Assy DESCRIPTION 2SC3502 F NPN 200V 100MA TO 126 2SA1380 F PNP 200V 100MA TO 126 FAN 24V DC 160MA 80X80MM HIGH SPEED HSG 1X2 LOCKING CRIMP 093 0909
25. an AC voltmeter set to 1V scale Amp output noise level lt 225mV Set the VOICING FILTERS to zero the noise level should be 210mV Turn the BOOST to zero the noise level should be 25mV Turn the VOLUME to zero the noise level should be 1mV pF p END OF PROCEDURE 200Hz square wave at 46 dBV 5 mVrms input VOICING FILTERS at 0 all other knobs at 12 o clock halfway Look at output with scope set on 1ms div and 2V div 105 Fig 1 Tones center filters off Fig 2 String Bass IN Fig 3 Contour on 10 Fig 4 Presence on 10 Fig 5 Treble on 10 Fig 6 Treble on 0 Fig 7 Hi mid on 10 Fig 9 Low mid on 10 ig 11 Bass on 10 200Hz square wave at 46 dBV 5 mVrms input VOICING FILTERS at 0 all other knobs at 12 o clock halfway Look at output with scope set on 1ms div and 2V div 195 wa Fig 8 Hi mid on 0 Fig 10 Low mid on 0 Fig 12 Bass on 0 1 REVISION RECORD LTR ECO NO APPROVED DATE 52 TUNING 41V 2 20 R60 m STRING BASS D 53 50 AC KR D8 5 os PRE 6 5 2 CSD ae 2 5 2
26. d connect the supplied pover cable from the amplifier AC receptacle to an AC pover outlet of proper voltage and power rating see safety information on page 7 for details Next Connect your speaker cabinets to the amplifier outputs marked 240W Be sure not to exceed the recommended speaker load listed below Maximum Recommended Speaker Load 4 Chm or two 8 Ohm cabinets If you are using an RBH series cabinet set the crossover switch to full range Then Set all H controls and the Boost control to 12 o clock The Voicing Filters should be turned all the way down to get a flat response Set the Wlume and Master Volumes at 0 If you have a five string bass push the button marked String Bass in Next Using an instrument cable connect your bass to the Input jack and turn the power switch on and play If the clip LED flashes push the button marked 10db in This will prevent you from overdriving the preamp Now Set the master control to 12 o clock and slowy bring the Master volume up Do not turn the Wlume control in the input section past 12 o clock unless you want an overdrive effect If you have a bass with passive electronics make sure the controls are all the way up If you have a bass with active electronics turn all of the controls on the bass to the middle or flat position At This Point Yu should be hearing your bass quite well YOu can use the Volume and Master to achieve a comfortable sound l
27. ds repair a lt 5 Q S 8 5 2 5 400RB Series Installation and Maintenance Installation e To insure proper operation and to avoid potential safety hazards place the unit on a firm level surface When installing the unit in a rack be sure the mounting hardware can support the amplifier s weight To save space in your rack the 4 6 feet can be removed using a Philips head screwdriver Make certain that proper space is provided for ventilation The 400RB Series requires at least 2 inch clearance above for proper ventilation Never block the fan vent holes in the top or front of the amplifier If the amplifier will be installed in a rack or other enclosed area make sure that there is sufficient air movement within the enclosure to allow proper cooling Consult your dealer for more information e Avoid installation in extremely hot or cold locations and areas that are exposed to direct sunlight or near heating equipment e Avoid moist or humid locations Remember power amplifiers generate heat The heat sink fins and ventilation slots that form part of the enclosure are specially designed to remove this heat Placing other electronic equipment near these heat dissipation systems may possibly affect the long term reliability of both your amplifier and the other equipment Moving the Unit Before moving the unit be certain to disconnect any interconnection cord
28. evel Remember If you need more volume turn up the Master control first e gt Q S 7 Le 5 400RB Series Sound Tips The 400RB Series has several unique features which if used properly will obtain that sound you have been searching for The Equalizer The Equalizer is used to fine tune your sound When adjusting it do it just a little at a time These are active circuits and small changes can make a big difference in your sound With a little experimenta tion you will find that this equalizer is very easy to use never sounds weird and provides you with a large variety of great sounds unique to Contour Increasing the Contour level will scoop out mid range frequencies while boosting the highs and lows The sound once again is unique to GK and unavail able on any other Bass amp String Bass The way a Bass amp deals with the instrument low string is a critical part of it s sound In fact a five string instrument requires an entirely different low end response than a four string instrument No equalizer can make the necessary adjustments to accommodate both However the String Bass button on the 400RB Series does just that When it is out the 400RB is voiced like the 800RB the world s classic four string amp Push it in and the 400RB is voiced for five string instruments For some playing styles you may want it in even with a four string instru ment Boost Master
29. gs the way others have done them I also have not been very interested in following the latest fad I am a Stanford educated engineer who worked his way through school as a musician Like all musicians I have lugged amplifiers up stairways and into car trunks always wondering why these things had to be so heavy bulky and hard to handle As the principal innovator at GK our products reflect my attitudes and life experiences I don t model my designs after other manufacturer s products as some of our competitors are proud of reciting Instead I believe new and old problems are best solved with new solutions Having taken our own path products enjoy a unique unmatched sound allowing the artist using them every opportunity to make an original statement Having supported my products for over thirty years I have learned from the story they tell Gallien Krueger is a reflection of that story and has a commitment to support that legacy Just as the products I created thirty years ago are still telling their story the products we create today will be talking to us tomorrow be listening Robert Gallien 5 8 400RB Series Quick Start The 400RB Series is designed to be simple to operate Al controls have a well defined purpose and are vell behaved These directions will take you through the basics and give you a good start for setting up your sound First Set the power switch to Off an
30. off Should a problem occur during operation press this switch out first T 3 9 2 400RB Series NES E65 CANADA Qo SB c UL6500 USA l IEC65 EURO PE IRITIDADR SPEAKER LOADS CAUTION r CES O Rear Panel Controls E 8 E 1 AC Receptacle The power cord is detachable and plugs in here 2 240W Jacks 240W power amp output for Full Range operation only They deliver 240 watts into 4 Ohms Lower impedances should not be used Fach jack has a minimum of 8 Ohms each Higher impedances such as 8 Ohms 16 Ohms or No Load are acceptable No damage will result from operating the amplifier with the speakers disconnected 10 400RB Series 400RB Series Combos 400PB Seri es Combos S 5 5 8 Ohm 15 extension cabinet the combo s internal speaker can be disconnected by unplugging the speaker cable internal 8 Ohm speaker load To drive more than one connected to the combo s back panel Below is a The 400RB Series combos deliver the 400RB s unique features and distinct sound by using a variety of 400RB head and are rated for the same maximum power output and speaker load 240W into 4 Ohms Maximum pover is achieved by connecting one 8 Chm extension cabinet such as the
31. on inductive dummy load 5 Connect the function generator to the INPUT jack of the amplifier 6 Raisethe main VOLUME for slight clipping on the output approximately 33Vrms 7 Press the 10 dB switch IN The output should drop to approximately 13Vrms 8 Pressthe 10 dB switch OUT Turn the BOOST to zero Output should be 3 8Vrms 9 Turn the WOOFER MASTER to zero output should be 0 volts 10 Turn the main VOLUME back down to zero TONES AND FILTERS TEST 1 Set the VOICING FILTERS to zero all other controls to the center 12 o clock and all switches out 2 Disconnect the load from the amplifier output 3 Change the scope setting to 2V Div and 1ms time base 4 Set the function generator to output a 200 Hz square wave at 5mVrms 46 dB V 5 Turnthe CONTOUR to 10 and compare the output to Figure 3 on the waveforms page Turn the CONTOUR back to zero 6 Turnthe PRESENCE to 10 and compare the output to Figure 4 Turn the PRESENCE back to zero 7 One at a time turn each ACTIVE EQ knob all the way up and all the way down and compare the output to the corresponding figures on the waveforms page Remember to reset each knob to its center 12 o clock position before proceeding to the next tone control NOISE TEST Remove the function generator from the INPUT jack Connect a speaker to the amp output jack Turn all knobs to 10 and leave all switches out Listen for any unusual noise there should be no pops or crackling sounds Connect
32. ot Use Extension Cords To avoid safety hazards use only the power cord supplied with your unit If a replacement cord is used make certain that it is of consistent quality and gauge as the original W do not recommend using extension cords with this product As with all electrical devices do not run power cords under rugs or carpets or place heavy objects on them Damaged power cords should be replaced immedi ately with cords meeting factory specifications Handle The AC Power Cord Gently When disconnecting the power cord from an AC outlet always pull the plug never pull the cord If you do not intend to use the amplifier for a consid erable length of time disconnect the plug from the AC outlet Do Not Open TheAmplifier Enclosure There are no user serviceable components inside this product Opening the amplifier enclosure may present a shock hazard and modification to the product will void your warranty If liquid enters the unit or any metal object such as a paper clip wire or staple accidentally falls inside the enclosure disconnect the unit from the AC power source immediately and consult an authorized service station Unpacking The carton and packing materials used in shipping your new amplifier were specially designed to cushion it from the shocks and vibration that occur during transport W suggest that you save the carton and packing materials for use in shipping in the event you move or the amplifier nee
33. ottom of it s travel and trying to push it the other way it could knock you over If the amplifier doesn t have this ability the sound is unresponsive and less out front The amp loses it s punch and feel at higher playing levels Instead of responding to your every command the amplifier simply cuts those transients off leaving you with the feeling that something is missing in your sound Since most amplifiers have limited output current capacity they need current limiting circuits to protect against self destruction High power tran sients trigger these circuits which rob the amplifier of it s ability to control speaker cones This creates a mushy unresponsive feel to your sound The 400RB Series has an extremely high current capacity over fifty amps so it doesn t need current limiting circuits for over load protection 12 There is nothing in the 400RB Series power amp to come between you and your sound except faithful raw power Equalization The sound you want is in your head but you just can t get it You think it s you your bass or maybe your amp Y s your amp Standard tone controls and graphic equalizers don t get it Sure they give you plenty of variation but they don t provide what the instrument really needs The fact is graphic equaliz ers are intended for room equalization and are only put in bass amps because it s a no brainer for the designer The equalization in Gallien Kruege
34. p Assembly DESCRIPTION LM555CN TIMER 2SC3381BL NPNX2 80V 100MA 2 10M1B 2SC3478 NPN 180V 100MA 25 3502 200 100 126 5 06 NPN 80V 500MA 92 25 1376 180 100 92 25 1380 200 100 126 MPSA56 PNP 80V 500MA 92 2SC4793 NPN 200V 1 5A 2 10R1A 2SC5242 NPN 230V 15A 2 16C1A 2SA1837 PNP 200V 1 5A 2 10R1A 2SA1962 PNP 230V 15A 2 16C1A 1N755A ZENER 7 5V 500MW DO 35 1N965B ZENER 15V 5 500MW DO 35 1N4148 RECT FAST 200MA 100V 4NS DO 35 BAV20 DIODE RECT 200V 1N4004 RECT 1A 150V DO 41 BRIDGE 25A 200V VERT PC MP25S 02 CAP CER AX 102 10 50V X7R CAP CER AX 103 10 50V X7R CAP CER AX 104 10 50V X7R CAP CER AXIAL 271 10 50V NPO CAP ELEC RAD 106 20 25V NP CAP ELEC RAD 336 10 50 25V CAP ELEC RAD 105 10 20 50V CAP ELEC RAD 106 10 50 50V CAP ELEC RAD 107 10 50 50V REF DESIG REF DESIG 1 U1 10004 2 07 10 1 Q14 6 Q2 6 11 12 27 28 2 Q3 9 1 Q13 3 Q1 5 8 3 Q15 17 18 3 Q20 21 22 3 Q16 19 26 3 Q23 24 25 1 D7 2 D6 10 10 D1 3 4 5 8 9 11 2 D2 12 2 D14 15 1 BR1 4 C16 21 26 27 1 C3 3 C4 5 15 1 C7 1 C17 1 C10 1 C14 4 C6 12 13 20 3 C8 9 11 LVL PART 2 031 3129 0 2 031 3476 0 2 032 4104 0 2 032 7104 0 2 034 7103 0 2 035 8100 0 2 035 8131 0 2 050 0101 0 2 050 0471 0 2 050 1001 0 2 050 1003 0 2 050 1004 0 2 050 1501 0 2 050 1801 0 2 050 2003 0 2 050 2202 0 2 050 3302
35. r amplifiers reflects 30 years of continuous develop ment and refinement The GK equalizer is unique to the industry it s not just a normal four band equal izer each section is a special circuit optimized to perform a Bass specific job in its range of operation These sections are wired in Series so they add to one another creating a tremendously flexible equalizer that doesn t sound weird at any setting Now it is possible to obtain the sound you desire 400RB Series Tech Talk Voicing Filters Vicing filters are used to completely revoice the amplifier In the case of the Contour and String Bass controls the effect is dramatic The Contour control tunes between two different shaping circuits with greatly different response With the control all the way up the low end is slightly boosted the mids are dropped and the high end is pushed up This is a contour response not available with a normal equalizer and is only found in amplifiers The way a Bass amp deals with the instrument lowstring is a critical part of it s sound In fact a five string instrument requires an entirely different low end re sponse than a four string instrument No equalizer can make the necessary adjustments to accommodate both however the String Bass button on the 400RB Series does just that When it is out the 400RB is voiced like the 800RB worlds classic four string amp Push it in and the 400RB is voiced for five string instruments
36. s to read through this manual If you are in hurry we suggest you at least read through the Quick Start section before setting up your newrig This will help get you started and give you few quick tips but is not a substitute for reading the rest of the manual Yur amplifier should have come with the following items please check the contents of the box to ensure that you have everything Included with your 400RB Head 400RB Rack mount ears with hardware Power cord Owner s manual Warranty card Safety instructions sheet Ne Included with your 400RB Gombo 400RB 112 or 115 Power Gord Owner s Manual Warranty Card Safety Instructions Sheet ee If your 400RB Series amplifier or combo did not come with all the items listed or if you encounter problems while setting up your new equipment please contact your local dealer or us as soon as possible at Callien Krueger Inc 2240 Paragon Drive San Jose CA95131 phone 408 441 7970 fax 408 441 8085 Internet wwwegallien krueger com Email sales gallien com V wish you a lifetime of good playing and remem ber to always have fun HI MID ex GALLIEN KRUEGER ee SEND RETURN TUNER 4OOFREB III HI CURRENT BASS AMPLIFIER LJ 2 8 a Q 2 400RB Series Always Listening I have never seen the point in doing thin
37. s with other components and make sure that you disconnect the unit from the AC outlet Cleaning When the unit gets dirty wipe it with a clean soft and dry cloth If necessary first wipe the surface with a soft cloth slightly dampened with mild soapy water followed by a fresh cloth with clean water Wipe immediately with a dry cloth Never use benzene thinner alcohol or other volatile cleaning agents not use abrasive cleaners as they may damage the finish of metal parts Avoid spraying insecticides near the unit Maintenance Your new amplifier is rugged It was built to give you a lifetime of trouble free operation if it is operated in accordance with the instructions contained in this manual The only maintenance required is cleaning If you are going to move your amplifier around frequently we recommend a road case to protect it from scratches and road wear 400RB Series n ex GALLIEN KRUEGER TOW RETURN TUNER HI CURRENT BASS AMPLIFIER ME Front Panel Controls 1 Balanced Direct Out An electronically balanced output that you can run to your P A system 2 Pre Post EQ Button Selects the direct out signal from before or after the EQ 3 Input Astandard 14 input jack and input attenuator button The button is generally left out except in rare cases when the clip LED flashes 4 Tuning Mute Button Set this switch to
38. ystem 400RB Series Safety Information Verify Line Voltage and Amperage Before Use Our new 400RB Series Bass Amp has been factory configured for use with 120 20 Amp circuit for USA amp Canada 230 WOIt SOFZ 10 Amp circuit for Europe amp Australia e 100 V olt 50FZ 20 Amp circuit for Japan Proper AC circuit for all other countries Connecting the amplifier to a line with specifications other than indicated above can create a safety and fire hazard and may damage the amplifier If you have any questions about the voltage requirements for your specific model or about the line voltage in your area contact your dealer before plugging the unit into a vall outlet Verify AC Circuit Capacity Before Use The high power output of your amplifier may require heavy current draw under Full Load conditions insure proper performance and avoid potential safety hazards we recommend connection to line circuits with Amperage specified as above Connecting multiple amplifiers to the same circuit or connecting the ampli fier to the same circuit used by other heavy power devices such as high wattage lights may cause circuit breakers to trip It is always a good idea to avoid using any audio equipment on the same AC circuit as equip ment with motors such as air conditioners or refrig erators This will lessen to possibility of power variation and electrical start up noise affecting your sound Do N

Service Manual 400RB-III Series

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