AB-900 Power Amplifier
Transcript of 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
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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.
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Professional Series Amplifiers
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.
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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.
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Professional Series Amplifiers
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.
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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.
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Professional Series Amplifiers
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.
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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.
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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.
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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.
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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".
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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".
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AB International
Rear Panel Connections
A UDIO M IXE R
:_- =;J 1C _ - r1.---•• ;-,-'-_-~:
MUL TI AM P SY ST EMELEcrRONIC CROSSOVER
SPE AKE R L
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Professional Series Amplifiers
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
590 watts per channel at 4 ohms 9220A
775 watts per channel at 2 ohms 9220A
925 watts bridged mono at 8 ohms 9220A
1123 watts bridged mono at 4 ohms 9220A
Continuous Power:Average Power:Output:
(120 VAC Line, 1KHz,
single channel driven)
525 watts per channel at 8 ohms 9420A850 watts per channel at 4 ohms 9420A
1100 watts per channel at 2 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
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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:
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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:
(120 VAC Line, 1KHz,
single channel driven)
350 watts per channel at 8 ohms 900A
590 watts per channel at 4 ohms 900A
775 watts per channel at 2 ohms 900A
925 watts bridged mono at 8 ohms 900A
1123 watts bridged mono at 4 ohm SOOA
Continuous Power:
Average Power:
Output:
(120 VAC Line, 1KHz,
single channel driven)
525 watts per channel at 8 ohms 1100A
850 watts per channel at 4 ohms 1100A
1100 watts per channel at 2 ohms 1100A
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
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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
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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.
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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
I
II
~ t-ifI! '. I
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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
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8/3/2019 AB-900 Power Amplifier
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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
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3. RFJ?LACED3 WITH (ZENER IN4749) 24V4. RFJ?LACERI W 1 J H (RESISTOR 3.6 ohm 1I2W)
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5. REPLACE 24V FAN WIlli 48VDC FAN
NOTE: FOLLOW FAN INSTALLATION
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PCB REPLACEMENT
GUIDE LINES
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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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