Service Manuals, User Guides, Schematic Diagrams or docs for : GALLIEN-KRUEGER Backline 100 gallienkrueger_backline100service

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gallienkrueger_backline100service


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Service Manual

 Backline 100
Table of Contents

Operating Instructions            3
Turn On / Calibration Procedure   7
Schematics                        9
Engineering Change Orders (ECOs) 17
Bill of Materials                24
                                                    Backline 100- Lead Amplifier
                                                         Turn-On Procedure
                                                     GK Document # 420-0093-C
                                      Board #'s: 206-0093-C (pre amp), 206-0094-C (power amp)
                                         Backline 100- all options 12/9/92 Rev. 11/23/99-SW

SETUP

1)    Variac on zero, power switch off- connect power cord.
2)    Connect output to load box with both sides connected together.
3)    Resistance loads open (switch in center), speaker on.
4)    1X probe to scope-A.
5)    Load box to scope-B and AC-VM.
6)    Set oscillator on 200Hz sine wave @5mVrms (-26dBV).
7)    DVM on 20mV range.
8)    AC voltmeter on 30V range.
9)    Scope-B on 10V/cm (or 5V uncalibrated ).
10)   Scope sweep on 1ms/cm, scope trigger on B.
11)   Connect reverb wires from preamp - red to output of reverb.
12)   On Backline Front Panel, set knobs to 0, switches out.

POWER SUPPLY ANY POWER AMP TEST

1)    With power switch on, gradually increase variac to 50V. Listen to speaker and watch scope for no  current draw.
2)    Check preamp supplies- +/- 16VDC (+/- 1V margin).
3)    Adjust variac to 120V and turn speaker off.
4)    Set bias. Hook DVM across collectors of Q6 and Q81 and adjust R50 (on '94 board) for 2mV across power resistors (R11, 24,57,79).
5)    Connect oscillator to return (200Hz @ -26dBV). Output = 9Vrms.
6)    Increase oscillator to



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