Marshall Amplification DSL40CR Service Manual

TO TEST VOLTAGES, SET AMPLIFIER TO:
1. Set all pots to maximum (10)
2. No tone shi
3. Output set to “Low”
4. No signal in inputs
5. Amplier plugged into an 16ohm load
6. Mains Switch “On”
7. Channel set to “Clean”
8. Loop set to “O”
Voltages 1 to 11 - Power Supply
Voltages 12 - BIAS Switching
Voltages 13 to 24 - PreAmp
Voltages 25 to 31 - PowerAmp
Voltages 32 to 33 - DXF1
Voltages 34 - Emulator
TO TEST SIGNAL, SET AMPLIFIER TO:
1. Set all pots to maximum (10)
2. Output set to “Low”
3. Amplier plugged into an 16ohm load
4. Signal generator set to 1kHz (9mV
rms or 25.46mV pp) sine wave
With signal 9mV rms or 25.46mV pp in
(T) JS206 (Return) signal on (T) JS201
(16ohm) = 941mV rms or 2.86V pp.
To get full output on (S) JS201 (16ohm)
Signal in Return (T) JS206 set to 90mV
rms or 255mV pp signal on (S) JS201
(16ohm)
= 9.1V rms or 25V pp (LOW)
= 19V rms or 58V pp (HIGH)
THROUGHOUT THIS SERVICE MANUAL
CL = CLEAN
CR = CRUNCH
OD = OVERDRIVE
B = BASE
E = EMITTER
C = COLLECTOR
TS = TONE SHIFT
MAINS TRANSFORMER SECONDARY WINDINGS
TEST POINT FEED(S) SUPPLIED VOLTAGE
CN 3/4 HT 1-5
CT, SCRN, HT6 “HIGH”
218V
CN 5/6 CT, SCRN, HT6 “LOW” 137V
CN 10/11 HEATERS (V2-8) 6.78V
CN 1/2 LT1, LT2, HEATER V1 15.2V
CN 21/22 BIAS1, BIAS2 108V
PLEASE NOTE: Due to possible variaons
in Mains voltages and component
tolerances, deviaon of up to 20% from
the readings is generally acceptable
parcularly with Waveform/signal
readings.
VOLTAGE AND WAVEFORM TESTING
TEST POINTS AND RELEVANT WIRING DIAGRAMS WITH RESULTS ALL DISPLAYED IN THE PAGES THAT FOLLOW.
Standby Switch O
Q
34
T
S
R
4
5
3
6
2
7
1
8
10DSL40CR service manual
BOOK-80015-01 | M3390.069

Marshall Amplification DSL40CR Specifications

General

Brand	Marshall Amplification
Model	DSL40CR
Category	Amplifier
Language	English