Gallien-Krueger 200MB User manual

Service Manual
200MB

Table of Contents
Operating Instructions 3
Turn On / Calibration Procedure 6
Sc ematics 9
Engineering C ange Orders (ECOs) 18
Bill of Materials 19

200MB/RCB T/O Procedure Rev.B-3/7/88
1) Inspectboard.
2) Connectmains.
3) Observethefollowing:
A) noload E)volume on0 I) chorusdepth on0
B) variac at 0 F) master on 0 J) chorus rate on 0
C) trimpotshalfway G) switchesoutK) speaker on
D) tones on 5 H) sustain on0
4) Graduallyadjustvariac to 25Vrms.
U20/P4= -1.5V (+or-)-.5V. U20/P8= 3.2V (+or-) -.5V.
Regulated supplies = -.5 V (+or-) .5V./ 7.1V (+or-) -.5V.
5) Graduallyadjustvariacto70Vrmswhilelisteningto the speakerand watchingvariac (ACamps)
andscope. Outputshould go–8V then +10V, motora little andsettle at0 between50-60Vrms.
Regulated supplies = -14.3V (+or-) .5V/ 14.2V (+or-) .5V.
6) Adjustvariac to120Vrms andturn speakeroff.Supply voltage(+or-)46.5V (+or -).5V.
7) Set bias. Adjust R207 to get 5mV across R197, R208 ( most pos. of the two), and R223, R224
(themost neg. ofthe two).
8) Setthefollowing:masteron10.
9) Connectsineinput(400Hz 50mVrms)–26 dB.
10) Compressortest.
A) Volume on10.
B) Sustain on 0. U2/P6= 700mVp-p. U4/P7= 2.3Vp-p.
C) Engage compressor. U4/P7=1.2Vp-p.
D) Gradually adjust sustainto10. U4/P7shouldincrease to1.7Vp-p.
E) Disengage compressor andcontinue.
11) Limiteradjustment.Adjust R174togeta flatresponseatU21/P2 (comparefig.)
12) Set thefollowing:volume on 0;4ohm load.
13) SlowlyturnupvolumejustuntillimiterLEDbeginstolight.Atthispoint,output shouldbeatfull
power=20Vrms.
14) Currentlimiter test.Changetoa2 ohm load.Outputshouldbea cleansine wavewithoutclipping
and= 12Vrms (+or-) .5Vrms.
15) Turnmasterup anddownto checkifit works properly.
16) Setthefollowing: volume and masteron10,noload.
17) Check direct out (J5) pins 2 and 3 = 550mVrms (1.5Vp-p).
18) Checkbalance outleft( J8)and right (J9).Both should =5.5Vrmsin stereoandmono modeat pins
2 and 3.
19) Check send (J7). 1.7Vp-p, clean sine wave. Probe at R229.
20) Check headphonejack (J3).Tip = 3.4Vrms /Ring =3.4Vrms or13Vp-p clipped.
21) Test return.
A) Plug input intoreturn(6). (400Hz 50mVrms sine) –26.0dB.Output = 4Vrms.
B) Lineout (J10)= 80mVrms.
22) Changeto square signalatinput (400Hz –26.0dB).
23) Testtonesandfilters and comparefigures.
24) Chorustest.

Note:Triggeris onthe channel, thescopeprobe ison,and connecttoD.0 (J5)@1V/div. Thiswillmake it
possibletomakemeasurementswithouthavingtriggerproblems. An externaltrigger could alsobe used.
A) Volume at 9o’clock
B) Master at 10.
C) Tones on5.
D) Engagechorus.
E) Rate 0/ Depth 0. Deviation = 1.3 sec. / Rate = 1.5 sec.
F) Rate0/ Depth10. Deviation= 5.0sec.
G) Rate 10/ Depth 10. Rate = .25 sec.
H) Disengagechorus.
25) Balanceouttest. Sineinput (400Hz50mVrms) –26.0dB.
A) Volumeon5.
B) Master on 10.
C) Tones on5.Balance out leftpins2and 3andbalanceout rightpinsshouldlook different.Left
shouldswellup and downtoamin. and max.value.Rightshould do thesame,however
oscillaterightandleft.
D) Engagechorus.
E) Stereo switch out.
F) Pushinstereoswitch(monomode).Signalonleftandrightshouldlooksimilar, swelling upand
down.
G) Chorus off.
26) Checkspeaker cut-off switch.
27) Disconnectinput.
28) Proceedwith noiseand tap test.
A) Controls on 10, switch out = noise <60mVrms.
B) Controls on 10, contour in = noise <80mVrms.
C) Controlson10, comp.in, sustain0 = noise < 50mVrms.
D) Controls on 10,comp. in, sustain10= noise<250mVrms.
E) Controls on 10,comp. in, sustain10 = noise<300mVrms.
F) Contour in, chorus in = noise< 40mVrms.
G) Contour in, master on 0= noise< 2.5mVrms.
Noiseshouldbeclean withoutpopping orcracking.

SW- Rev. 8/27/99 200MBINDENTEDBILLOFMATERIALS
NOTE: Level 1 refers to main assembly parts.
Level 2 refers to board level components.
Main assembly numbers are in bold face, while commonly
needed parts are italicized.
LVL PART# DESCRIPTION QTY REF.DESIG.
1 010-0012-0 MPSA06NPN 80V 500MA TO-92 1
1 011-0023-0 TIP29C NPN 100V 1A TO-220 FP 1
1 011-1035-0 TIP30C PNP 100V 1A TO-220 1
1 012-0084-0 TIP33CFP NPN 100V 10A TO218 2
1 012-1085-0 TIP34CFP,PNP,100V,10A,TO-218,PECOR 2
1 025-0116-0 RED LED,1.5MCD,120DEG,T-1 2
1 080-0061-0 TRANSFORMER,100W,120V 1
1 082-0039-0 SPEAKER,12",80W,Z=8,PYLEFOAMEDGE 1
1 091-0003-0 FUSE, 3A,125V,1/4X1 1/4,SLB 1
2 799-TEST-0 TRY OUT 0
1 092-0009-0 XLR,MALE,PCTERMTRIANGLE 3
1 093-0014-0 RECEPTICAL AC,Q-TERM 1
1 093-0032-0 HOUSING,3X.156,FEMALE22GA,LOCK 2
1 094-0013-0 HOLDER,FUSE,1/4 X 1 1/4,Q-TERM 1
1 094-0019-0 SOLDERLUG,#6 1
1 095-0005-0 POWER CORD,117V PLUG,DETACH 1
1 100-0012-0 GROMIT,3/16X.100 1
1 100-0016-0 LOGO,3INCH,CAST 1
1 100-0027-0 BUTTON,ROUNDBLACKCAP-PUSHSWITCH 1
1 100-0030-0 BUTTON,RECTBLACKCAP-PUSHSWITCH 1
1 100-0037-0 HEATCLIP,TO-98 1
1 100-0042-0 HANDLE,RUBBER,6.5" 1
1 100-0044-0 BUMPER,1/2",SQUARE 2
1 100-0057-0 KNOB BODY 18 SPLINE SHAFT 9
1 100-0062-0 KNOB CAP GRAY,FOR 100-0057 9
1 100-0065-0 CAP FOR 6.5" HANDLE “BLACK” 2
1 100-0076-0 FOOT,RUBBER,ROUND,5/8DIA.X5/8" 4
1 111-0061-0 BOLT 4-40 3/8 PHPCAD 4
1 111-0081-0 BOLT 4-40 1/2 PHPCAD 6
1 111-3041-0 SCREW 4AB 1/4 PHPCAD 6

LVL PART# DESCRIPTION QTY REF.DESIG.
1 111-6001-0 NUT 4-40 KEP SMALL 4
1 111-6011-0 NUT4-40HEX SMALL CAD 6
1 111-7011-0 WASHER#4SPLIT 6
1 112-0051-0 BOLT6-32 5/16 PHP CAD 4
1 112-1050-0 BOLT 6-32 5/16 FHP 82^ B.O. 11
1 112-1120-0 BOLT 6-32 3/4 FHP 82^ B.O. 8
1 112-4080-0 SCREW 6AB 1/2 FHP 82^ B.O. 38
1 112-4081-0 SCREW 6AB 1/2 FHP 82^ CAD 1
1 112-4140-0 SCREW 6AB 7/8 FHP 82^ B.O. 1
1 112-6001-0 NUT 6-32 KEP LARG SIZECAD 8
1 112-7001-0 WASHER #6 FLAT CAD 12
1 113-0080-0 BOLT8-321/2PHPB.O. 4
1 113-6011-0 NUT 8-32 KEPCAD 4
1 114-0080-0 BOLT 10-32 1/2 PHP B.O. 2
1 115-7005-0 WASHER3/8FIBRE FLAT 1
1 115-7021-0 WASHER 3/8INTERNALCAD 12
1 115-7031-0 WASHER SMALL 3/8LOCK CAD 3
1 132-0349-A 200MK/MVTOPCOVER 1
2 120-0005-0 ALUM .100 98
1 132-0350-B 200MB-MKRIGHTSIDE 1
2 114-6046-0 NUT 10-32 CAPTIVE 1
2 120-0005-0 ALUM .100 164
1 132-0351-B 200MB-MKLEFTSIDE 1
2 114-6046-0 NUT 10-32 CAPTIVE 1
2 120-0005-0 ALUM .100 164
1 132-0352-B 200MBBAFFLE 1
2 120-0005-0 ALUM .100 384
1 132-0356-B 200MKGRILL 1
2 120-0003-0 STEEL,16GA,PERF,3’X10’X.060 0
2 120-0011-0 STEEL,18 GAUGE JETCOAT,.048 272
1 132-0384-B 200MBFRONTPANEL SERIES2 1
2 112-6016-0 NUT 6-32CAPTIVE 5
2 120-0007-0 ALUM .063 54