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.

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