AB-900 Power Amplifier

8/3/2019 AB-900 Power Amplifier

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AB INTERNATIONAL

MODEL 900A / IIOOA

MODEL 9220A / 9420A

SERVICE INFORMATION

AB International Electronics1830-6 Vernon Street / P.O. Box 1105

Roseville, Ca 95678/916-783-7800





Professional Series Amplifiers

Circuit Description

To assure absolute long term reliability, the output section of each channel

incorporates multiple Motorola Power Transistors, which provide 3 times the

amplifiers rated power in watts of dissipation per channel. The output stage isarranged in a fully-complimentary format for class AB/2 operation. The bias

current is evenly distributed among all output devices. Bias thermal compensa-

tion is accomplished by thermally mating a bipolar semiconductor junction to the

heat-producing output device. Triple diffused high power driver transistors are

employed along with high speed, high voltage silicon annular devices for the pre-

driver and inverter stages. Utilization of these components provides the required

separation of Ftbreak points for absolute stability. Fully complimentary drive and

loading is utilized throughout. Only 20 dB of negative feedback is used to reduce

forward transfer distortion to minimum levels. VI type energy limiters are incorpo-rated for short circuit protection of the amplifier. Due to the unusually large safe

operating area of the output stage, the limiters do not actuate until driving a forty-

five degree reactive load of under 2 ohms at full power.

Construction

The amplifiers are designed on an all-modular concept permitting rigorous pre-

assembly module testing and maximum service accessibility. Each functionalmodule is fully tested before final assembly. Although components of the highest

quality are used throughout, each amplifier is burned in, prior to shipment, at the

worst case operating point to eliminate any possibility of component malfunction.

All chassis components are precision machined from high quality aluminum and

sheet steel stock. The entire package concept is directed toward maximum

efficiency of space and structure, accounting for the compact size and light

weight.




Thermal Protection

Certain conditions of operation (restricted airflow cooling, sustained high power

operation into low impedance loads) can result in a rise in output device casetemperature sufficient to affect the amplifiers performance.

Should the heatsink reach 95°C, the output will be automatically disconnected

from the load (loudspeaker) and will remain disconnected until the temperature

drops below 95°C. The action of removing the load has the effect of eliminating

output current. Which, in turn, results in an immediate and rapid drop in tempera-

ture. The load will automatically be reconnected when the temperature drops

below 95°C.

Fan Assist Cooling

All Professional Series amplifiers are equipped with a two level 24 Voc fan. The

fan speed is determined by the amplifier heatsink temperature. At maximum

speed, the fan has a 110 CFM output to assure proper cooling under severe

conditions.



AB International

Installation

All AB International amplifiers are designed for mounting in a standard 19-inch

equipment rack, or one of the many 19-inch rack-type portable cases available.

The amplifiers require 51/4 inches of vertical panel space, with 117/8 inchesrequired behind the panel. Total depth, including handles is 135/16 inches. Front

panels are machined from solid aluminum stock, with a black textured finish and

sturdy rack mount handles.

Placement of the amplifier is not critical for normal operating, provided sufficient

air flow is allowed to reach the heatsink array. Ifthe unit is to be placed on a shelf,

or a similar unenclosed area, allow four inches of clearance behind the heat-sink

to permit vertical air flow through the array. For installation in a cabinet, allow an

additional two inches above and one inch below the amplifier to permit air to bedrawn around the back. If the amplifier is to be mounted in an equipment rack or

cabinet with heat producing equipment, be sure that environmental operating

temperatures do not exceed 55°C (131°F). Should overheating occur because

of inadequate ventilation, the temperature protection circuitry will automatically

protect the amplifier. When a safe operating temperature is restored, the amplifier

will return to normal operation.

Because the amplifiers are capable of delivering high power from a relatively small

physical package, considerable heat can develop in cabinets containing severalinstruments. A good rule of thumb to adopt is to provide forced air cooling any

enclosure containing four or more instruments.

Power Connections

Professional Series power amplifiers are specified for operation from 120/240

Volt 50/60 Hz mains supply.

Equipment for domestic (USA) consumption includes a captive power cord witha three pin polarization plug. DO NOT REMOVE THE CENTER GROUNDINGPIN!

In new installations and portable sound systems, or any situation in which the

mains power is suspect, it is wise to confirm appropriate voltage and line polarity

BEFORE connecting the instrument to power sources.




Front and Rear Panel Controls

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1. POWERSWITCH

To turn the Amplifier ON or OFF, press the upper or lower portion of this

switch rocker.

2. POWER INDICATING LED

This LED indicates power is turned ON.



AB International

3. LEVEL CONTROLSEach channel has a separate low-noise 41 click detent rotary level control.

Rotate controls clockwise to increase level.

4. "PEAK LlM,IT"/"SOFT CLIP" CONTROLEach channel has a "Peak Limit" /"Soft Clip" switch. Prior to using your

amplifier you should first decide which feature best fits your application. If

you have need for peak power limiting, select the "LIMIT": "8 ohm","4

ohm" or "2 ohm" position that corresponds with your speaker load. Thiswill

limit the input signal approximately 3dB from rated output and no clip

overdrive will occur. Note: 3dB equals half power output. If you select the

"SOFT CLIP" position, the amplifier will reach rated output and no hard

clipping will occur. The "OFF" position will give no peak limiting or clip

protection. If the Red LED regularly illuminates, you should readjust theinput level to prevent Clipping or select "SOFT CLIP". Most applications will

use the "SOFT CLIP" feature since you get both maximum power and

protection.

5. SIGNAL STATUS DISPLAY

lWO "11 LED STRIP" output displays are normally off when no signal is

present and illuminate progressively as input signal increases. The Green

and Yellow LED's represent the amount of signal (in dB) present at the

outputs of the amplifier. The Red LEDwill illuminate when the output levelexceeds rated output and the amplifier has gone into "CLIP". Ifthis situation

occurs, you should readjust the output level to prevent any speaker dam-

age.

6. UNBALANCED INPUT CONNECTIONS

Unbalanced inputs connect directly to the channel one and channel two

quarter inch phone jacks. These inputs take priority over the XLR input

jacks.

7. BALANCED INPUT CONNECTIONS

XLR input connectors are provided for the balanced input circuit. Please

note that Pin 1: Ground, Pin 2: High, Pin 3: Low.




Front Panel and Rear Panel Controls (continued)

8. GROUND/LIFT SWITCH

The GROUND/LIFT SWITCH is provided to eliminate ground loops, be-

tween this amplifier and a preamplifier, that can occur in certain installa-tions.

9. DUAL/MONO SELECTOR SWITCH

Bridged mono operation is easily achieved by the supplied toggle switch.

The signal should be applied to channel one input only and the correspond-

ing front panel gain control is then used to set the level.

10. OUTPUT CONNECTIONS

Output connections are via five-way binding posts, identified as to polaritywith a red and black terminal. We suggest the use of dual banana plugs as

a convenient and reliable method of hook-up. They allow rapid removal for

polarity reversals. This feature is often necessary in the check out and

adjustment of multi-element biamplified and triamplified sound systems.

Heavy Class II wire may be used by unscrewing the large plastic portion of

the output terminal and inserting the wire into the hole provided. Note: It is

extremely important when making wire connections that no wire stand or

end touches an adjacent terminal!

11. FUSEHOLDER

The fuse holder contains the Primary AC Fuse. The fuse should only be

replaced with one of the same type. If fuses continue to blowout, stop

replacing the fuse and refer servicing to qualified personnel.

12. AC POWER CORD

Plug the Power Cord into an AC outlet that delivers the proper voltage and

current for amplifier operation.



Front Panel and Rear Panel Controls

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1. POWER SWITCH

To turn the amplifier ON or OFF, press the upper or lower portion of

this rocker switch.

2. POWER INDICATING LED

This LED indicates power is turned ON.



3. LEVEL CONTROLS

Each channel has a separate low-noise 41 click detent rotary level control.

Rotate controls clockwise to increase level.

4. SIGNAL STATUS INDICATORS

Two green LED indicators are normally off with no signal present and

illuminate when signal is present.

5. CLIP INDICATORS

Two red LED indicators illuminate when the input signal levels exceed 3 dB

above clipping. Adjust the level control to minimize clipping.

6. UNBALANCED INPUT CONNECTIONS

Unbalanced inputs connect directly to the channel one and channel two

quarter inch phone jacks. These inputs take priority over the XLR input

jacks.

7. BALANCED INPUT CONNECTIONS

XLR input connectors are provided for balanced input signals. Please

note; Pin 1: Ground, Pin 2: High, Pin 3: Low.

8. GROUND/LIFT SWITCH

To eliminate ground loops between this amplifier and a preamplifier in

certain installations, a GROUND/LIFT SWITCH is provided.

9. DUAL/MONO SELECTOR SWITCH

Bridged mono operation is easily achieved by the supplied toggle switch.

The input should be applied to channel one only and the corresponding

front panel gain control is then used to set level. Refer to Bridged Mono

Operation, page 9.



10. OUTPUT CONNECTIONS

Output connections are via five-way binding posts, identified as to polarity

with a red and a black terminal. We suggest the use of dual banana plugs

as a convenient and reliable method of hook-up. They allow rapid removal

for polarity reversals. This feature is often necessary in the check out and

adjustment of multilevel biamplified and triamplified sound systems. Heavy

Class" wire may be used by unscrewing the large plastic portion of the

output terminal and inserting the wire into the hole provided. It is EX-

TREMELY IMPORTANT, when making wire connections, that NO wire

strand or end touches the adjacent terminal, shorting the output.

CAUTION:

Never strap the two red output terminals together (in parallel). Never

connect either red output terminal to chassis ground.

11. FUSE HOLDER

The Fuse Holder contains the Primary AC Fuse. The fuse should only be

replaced with one of the same type. If the fuse continues to blowout, stop

replacing the fuse and refer servicing to qualified personnel.

12. AC POWER CORD

Plug the Power Cord into an AC outlet that delivers the proper voltage and

current for amplifier operation.



AB International

CAUTION:

The 9220A and 9420A amplifiers are a product of the most advance technology

and manufacturing techniques and is fully protected against overheating, input

overload and shorted or mismatched loads. As is the case with any precisioninstrument, some care should be taken in the unit's operation. The following

precautions should be noted and adhered to. Damage resulting from their

omission is not covered under the terms of the warranty.

DO NOT PARALLEL THE TWO OUTPUTS OF EACH CHANNEL BY CONNECT-

ING THEM TOGETHER OR PARALLEL THEM WITH ANY OTHER AMPLIFIER

OUTPUT. NEVER CHANGE A FUSE WITH AC POWER CONNECTED. UNDER

NO CIRCUMSTANCES SHOULD THE AMPLIFIER BE OPERATED WITH THE

COVER REMOVED. THERE ARE NO USER SERVICEABLE COMPONENTSINSIDE. AVOID POTENTIALLY DANGEROUS SHOCK HAZARDS, KEEP THE

COVER CLOSED AT ALL TIMES!

BRIDGED MONO OPERATION

1. Set the DUAL/MONO SWITCH to MONO.

2. Connect the input signal to channel one's input jack.

3. Connectthe speaker load to the two red terminals of each channel. Confirmthe (+ ) terminal of speaker to channel one and the (-) terminal to channel

two.

4. Do not use the black terminals of either channel.

5. Assure the speaker impedance is 4 ohms or above.

6. Adjust output using the channel one control. Set channel two level to "0".



CAUTION:

The 900A and 11O O A amplifiers are a product of the most advanced technology

and manufacturing techniques and are fully protected against overheating, input

overload and shorted or mismatched loads. As is the case with any precision

instrument, some care should be taken in the unit's operation. The following

precautions should be noted and adhered to. Damage resulting from their

omission is not covered under the terms of the warranty.

DO NOT PARALLEL THE TWO OUTPUTS OF EACH CHANNEL BY CONNECT-

ING THEM TOGETHER OR PARALLEL THEM WITH ANY OTHER AMPLIFIER

OUTPUT. NEVER CHANGE A FUSE WITH AC POWER CONNECTED. UNDER

NO CIRCUMSTANCES SHOULD THE AMPLIFIER BE OPERATED WITH THE

COVER REMOVED. THERE ARE NO USER SERVICEABLE COMPONENTS

INSIDE. AVOID POTENTIALLY DANGEROUS SHOCK HAZARDS, KEEP THE

COVER CLOSED AT ALL TIMES.

BRIDGED MONO OPERATION

1. Set the DUAL/MONO Switch to MONO.

2. Connect the input signal to channel one's input jack.

3. Connect the speaker load to the two red terminals of each

channel. Confirm the (+ ) terminal of the speaker to channel

one and the (-) terminal to channel two.

4. DO NOT use the black terminals of either channel.

5. Assure the speaker impedance is 4 ohms or above.

6. Adjust output using the CHANNEL ONE control and

Set CHANNEL TWO level to "0".



AB International

Rear Panel Connections

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MUL TI AM P SY ST EMELEcrRONIC CROSSOVER

SPE AKE R L




SPECIFICATIONS

Two Channel Audio Power Amplifierype:

Gain: 31dB (each channel) 9220A33dB (each channel) 9420A

Continuous Power:

Average Power:

Output:

(120 VAC Line, 1KHz,

single channel driven)

350 watts per channel at 8 ohms 9220A



925 watts bridged mono at 8 ohms 9220A


Continuous Power:Average Power:Output:



525 watts per channel at 8 ohms 9420A850 watts per channel at 4 ohms 9420A


1300 watts bridged mono 8 ohms 9420A

1700 watts bridged mono 4 ohms 9420A

Frequency

Response:Plus/Minus 0.5dB

20Hz to 20KHz

Distortion: No more than 0.25% THD or 1 M , 0.01Wto rated power, 20Hz to 20KHz (0.01% Typical)

Hum and Noise: 104dB below rated output

(unweighed 20KHz bandwidth)

Input Sensitivity: 1.7 VRMS for rated power

Input Impedance: 15K ohms, nominal

Transient Intermodulation

Distortion: less than 0.02%

Crosstalk: -86dB.

Damping Factor: 500:1 at 1KHz





Specifications PRlOR SEPT. 1987

Type: Two c ha nn el au dio power amplifier

Gain: 31 dB (each channel) 90 0A

3308 (each channe\) "" CCA

Continuous

A verage Pow er

O utput :

300 watts per channe l at 8 ohms 900A

500 watts per channel a t 8 ohms 1 1O O A

500 watts per channel a t 4 ohm s 900A

750 watts per channe l at 4 ohms 1 1O O A

Dimensions:

P lus /M inu s O . 5d B

20Hz-20kHz

No m ore than 0 .2 50/0 THO or 1 M ,0.01 W

to rated power, 2 0Hz to 2 0kHz

( typ ica ll y 0 .010 /0 )

1 01 dB below rated output

(unweighted

20 kHz bandw id th )

1 .6V RMS for ra ted .output

1 5 K ohms . nomina J

(2)114 - in chphQne ~ad< .sunbalanced )

(2 ) XLR (b ala nc ed )

Dua lS -way b in din g p os ts

(Front P anel) A C m ains pow er sw itch,pow er-on LE O ind icator, C hanne l O n e

and Tw o leve l contro ls , B ridge m ode

sw itch , G round lift switc h. 1 2 0 /2 4 0V

line sw itch . C hannel one and tw o signa l

s ta tu s in dic ato rs (g re en a ctiv e re d c lip )

1 0 0-1 3 0\JAC . SO -60Hz 9 0W tid le ),

1 000W (m axim um ) 9 00 A

1 500W (m axim um ) 1 1 O O A

5-1 /4" H (1 3.3cm ) 1 9" W (48.3cm )

1 1 -7/8" (3 0.2 cm) b eh ind pa ne l

13·318" ( 34cm) overal l

3 91b s (1 7 .7 1<g)

4 3 I bs (1 9 .6k g)

Frequency

Response:

Distortion:

Hum and Noise:

I npu t Sensit iv ity :

I np ut Impe da nce:

I nput Connec to rs :

O u tpu t Connecto rs :

Contro ls &Indicators:

Weight:



Precedent Series Amplifiers

SPECIFICATIONS

Two Channel Audio Power Amplifierype:

Gain: 31 dB (each Channel) 900A

33 dB (each Channel) 11OOA

Continuous Power:

Average Power:

Output:







1123 watts bridged mono at 4 ohm SOOA

Continuous Power:

Average Power:

Output:






1300 watts bridged mono at 8 ohms 11OOA

1700 watts bridged mono at 4 ohms 11OOA

Frequency

Response:

Plus/Minus 0.5 dB

20 Hz to 20 KHz

Distortion: No more than 0.25% THD or 1M , 0.01W to

rated power, 20 Hz to 20 KHz (0.01% typical)

Hum and Noise: 104 dB below rated output

(unweighed 20 KHz bandwidth)

Input Sensitivity: 1.6 VAMS for rated power

Input Impedance: 15K ohms, nominal

Transient Intermodulation

Distortion: less than 0.02%

Crosstalk -86 dB

Damping Factor: 500:1 at 1 KHz



Slew Rate: Closed loop response greater than 40 Volts

per micro second

Thermal Protection: Thermal sensor activates channel shut down

at 95° C.

DC Protection: DC sensor activates channel shut down if a

DC condition exists.

Turn-On Delay: 3 Seconds, solid-state actuated.

Heat Sink and

Cooling:

High efficiency, convection cooled with

"Venturi Style" fan assist providing extra

power handling utilizing massive heat sink

extrusions.

Input Connectors: (2) 1/4 Inch Phone Jacks (unbalanced)

(2) XLR (balanced)

Output Connectors: 5-way Binding Posts

Weight: 29 Ibs. (13.2 kg) 900A

34 Ibs. (15.4 kg) 11O OA

Controls and

Indicators:

(Front Panel) AC Mains Power Switch

Power-on LED Indicator, Channel One and Two

Level Controls. Channel One and Two Signal

Status Indicators (green active / red clip)

(Rear Panel) Dual/Mono Switch and

Ground Lift Switch.

Power (Input): 100-130 VAC, 50/60 Hz 90 W (idle)

1000 Watts (maximum) 900A

1500 Watts (maximum) 1100A

Dimensions: 5'/411 (13.3 cm) H, 19" (48.3 ern) W

117/811

(30.2 cm) 0, behind panel

133/811(34.0 ern) 0, over all



DC LATCH

TEST PROCEDURE

TEST POINT

Your AB International amplifier is equipped with a D.C. Latch Protection Circuitry.

In a case where a D.C. voltage of: 3 volts or greater exist at the output of the

channel, it will then trigger a relay at the power supply and shut the amplifier off.

Failure to test this circuitry, prior to use of the amplifier, may cause damage to a

speaker if a failure occures in the future.

The D.C. Latch Circuitry is made up of two parts:

1) Individual channel RC Network and Triac circuitry.

2) Power Supply Relay Network.

Note: The power supply relay network serves the function for all the channels

in the amplif ier.

Test these circuits by following theae procedures:

1) Take a 10K ~ watt resistor and apply it across two points- -

A) The junction of Rf4, an d InS (see sch_tic) and,

B) Any DC voltage point on the Power Supply.

Note: You are now forcing the triac to trigger by applying D.C. voltage tothe baae of the triac.

2) If step one worked properly your tnac should have triggered and now

coonected the latch line to ground. When the Power supply latch is connected

to ground, the relay (Kl) will engage and sbut the amplifier off bydisengaging the gate of the triac (Ql).

3) If step one and two worked properly, shut the amplifier off and discharge the

main power supply filter caps. This will engage the Triac Ql on the power

supply. The amplifier should now turn on and work properly.

Notes

1) If you are testing Power Supply PCB Revision B - F:

The amplifier will cycle on and off every few seconds when the

D.C. Latch circuit has been triggered.

2) If you are testing Power Supply PCB Revision G or Higher:

The amplifier will shut off When the D.C. Latch circuit bas been

triggered. To reset you ~t .&ut'the amplifier off and discharge

the power supply caps through a 100 ohm resistor.



AB INTERNATIONAL COMPONENT DATA

DIODES USA

, ; -.. : . , . . . . II I ZENIER VOLTS W/A

1.'<4733

1

ZENIER 5.1 1101

: :"N~73S ZEN!ER 6.2 1",·

lN4737 ZENIER 7.5 1101 I

L-<4742 ZENIER 12 1101j

r 1

! IN<:745 I ZENIER 16 1w I

1 I1N4749 ZENIER 24 lw

I1N47S2 ZENIER 33 101

-- -

11'14001 SW/DIODE 50 30 UPDATED TO 11'14004

11'1914 SW/DIODE 75 75ma

11'15196 SW/DIODE 200 200 UPDATED TO FR303,

IFR303 SW/DIODE 200 200 UPOATED TO FR604

lN4004 SOl/DIODE 400 30

FR604 SW/DIODE 400 j 3A

I AS! REG. & TRIACS USA

10. If TYPE VOLTS 1 AMPS lPOLLARITY PACKAGE[ REPLACEMENT

f780S REG. 8

~1.5 POS. TO-nO/

7908 REG. -S 1.5 NEG. To-no

7812 REG. 12 1.5 POS. TD-220

7912 REG. -12 1.5 NEG. TO-220

t7815 REG. 15 1.5 POS. TO-220

7915 REG. -15 1.5 NEG. TO-220

7818 REG. 18 1.5 POS. TO-220

7918 REG. -18 1.S NEG. TO-220

97A4 TRIAC TO-92 L201E3

L201E3 TRIAC 200 1 TO-92 Z0102DA

Q4015L5 TRIAC 400 15 TO-220

Q4025L6 TRIAC 400 25 TO-220

6027 PUT TO-92

Z01020A TRIAC TO-92

II

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AS INTERNATIONAL COMPONENT DATA

A81 TRANS1STER UPDATES USA

~rORIG. REV.l REV.2 REV.3 REV. 4 CASE TYPE

MPS8S99 AS6 2N5401 TO-92

MPSLOl 2NS550 2N5551 TO-92

MPSL51 2NS400 2NS401 TO-92

MPS6571 2N4401 2NS551 TO-92

710 2N4920

RCAIC12 2238 HJE15030 TO-220

2NS416 TOS

2N3440 T05

MJE340 TO-225

MJE3S0 TO-225

MJH1102i TO-218

TIP122 TO-220

I " " ' "TO-220

TIP318 TO-220

\TIP328 TO-220

TIP142 TO-220

TIP147 TO-220

2N340S

I 2N4920 TO-225

MJ1SOll MJ15022 HJ21194 T03

MJ15012 HJ1S023 HJ21193 T03

2S8554 MJ1S023 T03

2S0424 MJ15022 T03

---

~1804 HJ1SOll HJ15022 HJ21194 T03

1805 MJ1S011 HJ1S022 HJ21194 T03

MJ21l94 T03

MJ21l93 T03

MJ15023 HJ21193 T03

MJ1S022 HJ21194 T03

2SC2837 TO-218

23A1186 TO-218

MJL2119 TO-3P8L

MJL2119k

ITO-3P8L

23A15531 TO-3P8L

12SC40291 l l TO-3PBL

~

POLL.

------ICmax vceo I---

lS0 j40ma

---600ma 160

---240ma lS0

------600ma 160

------

------8a 120

1a 350

------lA 350

------.Sa 300

------.Sa 300

------lSa 2S0

------.Sa 100

---.5a 100

------3a 60

------3a 60

------lOa 100

------lOa 100

------

------

------

-----1la 80

------lOa 250

------lOa 250

------16a 200

------16a 200

------7a 250

------7a 250

--- ---16a 250

------16a 250

------16. 250

------16a 250

------lOa 150

---lOa 150

------16a 250

------

1~ 250

---lSa 230

1 15a

---230

---

PNP

NPN

PNP

NPN

PNP

NPN

PNP

NPN

NPN

PNP

PNP

NPN

PNP

NPN

PNP

NPN

PNP

PNP

NPN

PNP

PNP

NPN

NPN

NPN

NPN

PNP

PNP

NPN

NPN

PNP

PNP

NPN

PNP

NPN



T ria c D ia g ra m

MT·2

MT-1 Q-10' Gate

MT-2

MT-1 Gate



FAN CONVERSION 24V TO 48V

MODELS 1100A,9420A, SUB 1850

PO\VER SUPPLY REV. H

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STEP 1. REMOVE D3 (ZENER IN4742) 12V

2. REMOVE RI (RESISTOR 1.8 ohm 1/2W)

3. RFJ?LACED3 WITH (ZENER IN4749) 24V4. RFJ?LACERI W 1 J H (RESISTOR 3.6 ohm 1I2W)

NOTE: TIllS CAN BE ACCO~LISHED BY

SOLDERING FROM TIlE TOP SIDE OF

TIffiPCB.

5. REPLACE 24V FAN WIlli 48VDC FAN

NOTE: FOLLOW FAN INSTALLATION

INS1RUCTIONS.

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1) S1 (Switch One) must be placed in proper position. If you are replacingChannel One, S1 must be in the " u p " position. If you are replacing ChannelTwo PCB, Sl must be in the "DN" position.

*Note: Sl determines the function of S2; either "Ground/Lift" or "Mono/Dual".

2) When connecting the Power Supply Ribbon Cable up to the Power PCB's - -

*Note: DO NOT MISS PIN THE CABLE, even for a second. The Power Supply Capshave a charge and may damage the PCB circuitry.

3) Apply an even thin coat of white Silicon Thermal Compound to angle. Failureto do so may cause improper heat transfer.

NOTE: EXCLUDE STEP ONE FOR DUAL CHANNEL PCB



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Date post:	06-Apr-2018
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AB-900 Power Amplifier

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