Crown Audio 800CSL Checkout Procedures, Standard Initial Conditions, Test 1 DC Offset

Page 13

Power Base-2 & 800CSL Amplifier Service Manual

Checkout Procedures

GENERAL INFORMATION

The following test procedures are to be used to verify operation of this amplifier. DO NOT connect a load or inject a signal unless directed to do so by the proce- dure. These tests, though meant for verification and alignment of the amplifier, may also be very helpful in troubleshooting. For best results, tests should be performed in order.

All tests assume that AC power is from a regulated 120 VAC source. Test equipment includes an oscillo- scope, a DMM, a signal generator, loads, and I.M.D. and T.H.D. noise test equipment.

STANDARD INITIAL CONDITIONS

Level controls fully clockwise. Stereo/Mono switch in Stereo.

Sensitivity switch in 26 dB fixed gain position.

It is assumed, in each step, that conditions of the amplifier are per these initial conditions unless other- wise specified.

TEST 1: DC OFFSET

Spec: 0 VDC, ±10 mV.

Initial Conditions: Controls per standard, inputs shorted.

Procedure: Measure DC voltage at the output connec- tors (rear panel). There is no adjustment for output offset. If spec is not met, there is an electrical malfunc- tion. Slightly out of spec measurement is usually due to U104/U204 out of tolorance.

TEST 2: OUTPUT BIAS ADJUSTMENT

Spec: 300 to 320 mVDC.

Initial Conditions: Controls per standard, heatsink tem- perature less than 40°C.

Procedure: Measure DC voltages on the output module across R02, adjust R26 if necessary. Measure DC voltages on the output module across R21, adjust R23 if necessary. Repeat for second channel.

TEST 3: ODEP VOLTAGE ADJUSTMENT

Spec: Cold Bias Per Charts Below ±0.1V DC.

Initial Conditions: Controls per standard, heatsink at

room temperature 20 to 30°C (68 to 86°F). Note: This adjustment should normally be performed within 2 minutes of turn on from ambient (cold) conditions. If possible measure heatsink temperature, if not mea- sure ambient room temperature. Use this information when referencing the chart below. The following is a list of ODEP Bias Voltages VS. Temperature.

°F

°C

V–ODEP

V+ODEP

66

18.9

–10.31

11.41

68

20.0

–10.26

11.36

70

21.1

–10.20

11.30

72

22.2

–10.14

11.24

74

23.3

–10.09

11.19

76

24.4

–10.03

11.13

77

25.0

–10.00

11.10

78

25.6

–9.97

11.07

80

26.7

–9.91

11.01

82

27.8

–9.86

10.96

84

28.9

–9.80

10.90

86

30.0

–9.74

10.84

88

31.1

–9.69

10.79

90

32.2

–9.63

10.73

92

33.3

–9.57

10.67

94

34.4

–9.51

10.61

–ODEP Procedure: Measure pin 6 of U100 and, if necessary, adjust R121 to obtain V–ODEPas specified above. Measure pin 6 of U200 and, if necessary, adjust R221 to obtain V–ODEPas specified above.

+ODEP Procedure: Measure pin 6 of U103 and, if necessary, adjust R132 to obtain V+ODEP as specified above. Measure pin 6 of U203 and, if necessary, adjust R232 to obtain V+ODEP as specified above.

13

Page 12 Page 14
Image 13
Page 12 Page 14
Contents Power BASE-2& 800CSL Avis Table of Contents Introduction WarrantyScope Parts Power SpecificationsPerformance MechanicalBLU Voltage ConversionTheory FeaturesOverview Front END OperationVoltage Translators Error AmpHigh Side HS Grounded Bridge TopologyLow Side LS Output Device Emulation Protection OdepPositive Test 2 Output Bias Adjustment Checkout ProceduresTest 3 Odep Voltage Adjustment Standard Initial ConditionsTest 5 Common Mode Rejection Test 4 AC Power DrawTest 7 Phase Response Test 12 Output PowerTest 14 Odep Limiting Test 16 Signal to Noise RatioTest 15 LF Protection Test 17 Turn on TransientsPost Testing Mechanical Non-Module Parts Back Panel Assembly Output Assembly ONE PER ChannelChassis Front Assembly Main Chassis Assembly Module History Module InformationOutput Modules Main ModulesQ42647-0 Output Module Parts List P10137-1 Board Q42717-1 Output Module MT/MA #2 for PB-2 Q42717-1 Output Module Parts List P10233-8 BoardQ42871-6 Output Module MT/MA TO-3P Driver for PB-2/ 800CSL Q42871-6 Output Module Parts List P10305-4 BoardQ42966-4 Output Module TO-3P Driver #2 for PB-2/ 800CSL Q42966-4 Output Module Parts List P10305-4 BoardQ43015-9 Output Module Parts List P10341-9 Board Q43203-1 Output Module Parts List P10397-1 Board Network Resistors Q42665-2 Main Module Parts List D 6910-0 BoardQ42665-2 Main Module Original for PB-2 IC’S SwitchesQ42683-5 Main Module #2 for PB-2 Q42683-5 Main Module Parts List D 6910-0 BoardZero OHM InterconnectsQ42818-7 Main Module 3rd Gain for PB-2/800CSL Q42818-7 Main Module Parts List D 7251-8 BoardDpdt Side Header 5 PIN Q43059-7 Main Module Parts List D 7993-5 Board Jumper UPA75

800CSL specifications

Crown Audio has long been a respected name in professional audio equipment, and the 800CSL amplifiers are a testament to their unwavering commitment to quality and performance. Designed for professional sound reinforcement applications, the Crown 800CSL offers an impressive blend of power, reliability, and versatility, making it a popular choice among audio engineers and event coordinators.

At the heart of the Crown 800CSL is its robust power output. This amplifier delivers an impressive 800 watts per channel at 4 ohms, ensuring that it can drive even the most demanding speakers with ease. It features a Class D design, which not only maximizes efficiency, allowing for more power with less heat generation, but also contributes to a lightweight chassis that is easy to transport and install. This makes the 800CSL a versatile option for both permanent installations and mobile events.

One of the key technologies employed in the Crown 800CSL is its comprehensive built-in protection circuitry. This includes advanced short circuit protection, over-temperature protection, and current limiting. Such features ensure that the amplifier operates reliably in challenging conditions, reducing the risk of damage to both the amplifier and the connected speakers. The inclusion of a low-frequency filter further enhances performance, providing clean, powerful bass without distortion.

The Crown 800CSL also offers a range of connectivity options, including XLR and ΒΌ-inch inputs, making it compatible with a wide variety of audio sources. This flexibility, combined with user-friendly front panel controls, allows audio professionals to set up and adjust the system quickly and efficiently.

Additionally, the amplifier features a robust and compact design with a lightweight aluminum chassis. This not only contributes to its portability but also aids in heat dissipation, further enhancing performance during prolonged use. The included handles on the chassis make it easy to transport the unit between gigs, while its durable components ensure longevity.

In summary, the Crown Audio 800CSL stands out for its power, efficiency, and reliability. From its Class D amplification technology to its comprehensive protection features, this amplifier is designed to meet the needs of professionals in the audio industry. Whether for concerts, events, or installations, the 800CSL is poised to deliver exceptional sound quality and performance, making it a valuable addition to any audio toolkit.
Top Page Image Contents