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ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
ALPHA 10/10P SERVICE MANUAL
CIRCUIT DESCRIPTION
The mother PCB is common for both the A10 and A10P with the exception of the input mode switch and pre-amp
output mute relay which are only fitted to the A10 and the power/standby LED and links to parallel the input
connections to what would otherwise be the pre-amp output for use with a mono link. The amplifier is based on the
D290/Alpha 9 design but with lower gain, a higher current and higher voltage driver stage and a high power output
stage. The current servo has been improved over the Alpha 9 to be output device independent. A micro supervises
the amplifier state, switch state and remote control functions. Provision is made for an additional 3rd channel PCB to
be added with power supply and protection circuitry access.
Input stage
The input connections are taken either from the pre-amp connector, LK12X, or the external power amp input on the
A10 depending on the position of SW1. On the A10P, the input is taken from the external power amp input only with
provision for a mono shorting link by having two parallel input connectors. On the A10, there is a mute relay on the
pre-amp outputs which are always connected to the pre-amp connector, LK12X.
The signal is passed through a low pass filter with a -3dB point of 550KHz at normal gain and 740KHz at low gain.
The gain is selected by SW2. C72 and C74 are d.c. blocking capacitors with a -3dB point of 0.7Hz. A d.c. error
correction current is injected into the base of Q19 and 26 from the voltage servo Z3 and 4, to null any voltage offset at
the amplifier output.
The input and voltage amplifier stages both run off regulated 15 Volt suppies. The input stage is an NPN differential
input, Q18, 19, 25 and 26, with an adjustable current source, Q21 and 28 which sets the quiescent current through all
the stages but specifically the output stage. C37, R58, C49 and R66 keep the input stage and voltage amplifier stable.
Q52, 53, 54 and 55 form a current mirror to ensure that the differential input is balanced during normal operation.
Voltage Amplifier
The voltage amplifier consists of another differential pair, Q48, 49, 50 and 51. Q48 and 50 are the positive pulling side
of the voltage amplifier output and Q49 and 51 pull negative via a current mirror Q8, 9, 10 and 11. The network C12,
36, R74 and 77 give the current mirror gain to compensate for the fact that Q49 and Q51 is only driven from the lowimpedance side of the input stage current mirror. The network ensures a fast, symmetrical slew rate of the voltage
amplifier stage.
Network C69, 70, R172, 174 ensure the overall stability of the amplifier by reducing the open loop gain at high
frequencies.
Second Voltage Amplifier and Driver Stage
Q33, 36, 41 and 44 are the next voltage amplifier stage with feedback applied from the output coupled to their
emitters. This stage runs on the full supply rail voltages and splits the level shifts the signal via Q2, 3, 5 and 6 to drive
the gates of the output MOSFETs, Q13, 14, 15 and 16. Q2 and 3 simply buffer the inverted signal at the collector of
Q36 to drive the low side MOSFETs, Q13 and 15. Q5 and 6 invert the inverted signal at the collector of Q41 and Q44
to drive the high side MOSFETs, Q14 and 16. To ensure that the high side drive is able to swing far enough to ensure
the high side MOSFETs can be driven to saturation, a bootstrap, C5, D41 R57, C78 and D22 boosts the driver stage
power supply during positive excursions of the amplifier output. This is inactive at low output voltage swings as any
distortion induced by the network would be more audible at such levels.
Output Stage
Both the high and low side output devices feature over-current protection, Q17, 23, 24, 30 which clamps the gate of
the MOSFET it protects. A high current is permitted through the MOSFET for a few milliseconds after which time the
current is throttled down to about 10A peak. A second current sensing network, Q32 and Q35 activates the
over-current protection cut-out if the low side is current limiting for too long, a few hundred milliseconds. The current
sensing resistors do not reduce the transconductance of the MOSFETs because the driver stage is referenced to the
MOSFET source. This means that the current through the driver stage is also sensed but this is insignificant as fas as
over-current protection sensing is concerned.
Auto-bias
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ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
Figure 1Block Diagram of Power Amplifier
The bias is regulated in two modes, one where these is no signal and one when signal is being split between the high
and low side MOSFETs when driving a alternating signal into a load.
Under static conditions, Z8 simply compares the sensed current, which includes the driver stage current, with a d.c.
mode reference of 13mV. The sense resistor is 0.11 so this corresponds to a current of about 120mA, some of which
is driver current. The current through the MOSFETs is about 80mA at this point. The comparator output is level shifted
to drive the integrating current servos Z3 and 4. This adjusts the amplifier current so that, on average, the bias level is
held at the reference point.
Under dynamic conditions, the low side drive will definitely be conducting more current than the reference (80mA) for
half the signal cycle and will be switched off for the other half. The result is a rectangle wave output from the
comparator, Z4.
When the output stage is biassed correctly (class AB operation) the comparator output toggles when the current
through the sense resistor for the -ve MOSFET is equal to the d.c. mode static reference level and at the half way
point of the signal. The result is a perfect square wave output from the comparator. Under these conditions, the +ve
MOSFET is also conducting the same amount of current at this point. If the bias level is lower than the reference, say,
at zero (class B operation) then the -ve MOSFET will spend slightly less than half the time conducting at or above the
reference level resulting in a rectangle wave output from the comparator at a duty cycle slightly less than 50%. If the
bias level is higher than the reference then the -ve MOSFET will spend slightly more than half the time conducting at
or above the reference level resulting in a rectangle wave output at a duty cycle slightly more than 50%. The change
in duty cycle away from 50% causes the integrator, Z3 and Z4 to adjust the bias level via the bias adjusting
transistors, Q22 and 29.
The integrator has a reference, the a.c. mode dynamic reference, for a bias point slightly higher than for a 50% duty
cycle. This eliminates the possibility of the bias being slowly throttled due to component tolerance mismatch resulting
in a reference which would pull the servo down. A high dynamic bias reference level simply stabilises the bias slightly
higher than the static reference but a low dynamic reference causes the bias to drift down to complete throttle.
This system works if the signal is a.c., symmetrical and is not a rectangle wave. Certainly, only a.c. signals are passed
Sense Resistor
Comparitor Output
-ve MOSFET
Measured Current (blue)
Other MOSFET
50%
Bias correct Under Biassed Over Biassed
49% 52%
Figure 2 Auto-bias under dynamic conditions
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ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
through the amplifier due to C72 and 74 d.c. blocking capacitors and on average the signal will be symmetrical. Any
short-term asymmetry will be ironed out by the long time constant of the integrator.
Main Power Supply
The main power supply is regulated in two stages. First it is pre-regulated by Q1 and 4 to about 11V less than the
main supply rails. This supply is made available to an option board. The maximum load on these supplies is 150mA
for less than 2W dissipation in Q1 and 4. These supplies are then regulated to +/-15V by Z1 and 2. These supplies are
used by the input stages of the power amplifiers including any 3rd channel board, the pre-amplifier board and an
optional phono amplifier board. The positive voltage regulator, Z1, has a larger heatsink than Z2 because the phono
board consumes much more current from the positive rail than from the negative rail.
Control Micro
The control micro performs the following functions...
‚ Switches the amplifier on or off,
‚ Mutes the speakers #1 or #2 or the pre-amp output,
‚ Monitors the heatsink temperature,
‚ Monitors RF content of speaker outputs,
‚ Handles the remote bus and infra red remote input,
‚ Reports fault conditions to the main display and LED,
‚ Reads the speaker and power switch positions.
The control micro runs of the constant power supply from standby transformer, TX2. This enables the amplifier to be
switched on or off remotely from the remote bus or, in the case of the integrated amplifier, from an infra red remote
control. This power supply is intended to supply all the digital circuitry in the amplifier including any option boards.
This is supplied at 8V to the other boards where it will be locally regulated to 5V as required.
The micro communicates with the display board via a multi-master I2C bus. This bus is used to report amplifier and
power status to the display micro and remote control commands received. It is also possible for the display micro to
control functions on the power amplifier board. The option board also uses this bus to receive any remote control
commands and communicate with the display micro.
The external remote bus handles raw information from infra red sensors with no demodulating. The remote bus input
can be echoed to the output through a buffer circuit. The incoming signal is demodulated by Z13. Raw signal is also
sent to the micro interrupt line, pin 12, for assessing the noise on the remote bus. In addition, any d.c. signal on the
remote bus is sensed on pin 2 of the micro in when it is not being used as an output to mute the hardware remote
echo buffer. The micro must modulate any output it sends to this bus with a carrier (37KHz). The output will drive one
or two series infra red LEDs directly.
The list below shows how various fault conditions can be deduced simply from the Power LED behaviour.
Figure 3 Micro Block Diagram
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ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
• On power up, the protection should be engaged. This is checked after 3 seconds on pin 9 of Z9. If it isn't
happening, the unit shuts down with flashing red.
• If the protection does not clear after about 16 seconds on power-up the unit shuts down to flashing red. This
is usually caused by a voltage offset.
• Any main amp power loss detected on pin 26 after power-up causes a shut down to flashing red.
• Any RF detected on pin 3 results on immediate shut down to flashing red.
• Any protection fault detected after power up on pin 9 results in a flashing amber LED for about 16 seconds
max. If it has not cleared by then the unit is shut down to flashing red. Protection faults are caused by voltage
offset or over-current. Over-current should latch resulting in a shut down after 16 seconds. Voltage offsets
should clear themselves if brief.
• A temperature fault on pin 25 results in the power LED flashing slow amber and can last indefinitely until it
clears. When it clears the flashing will speed up until the protection times back in.
ALPHA 10P POWER AMP MAIN BOARD PARTS LIST
Ref No. Description Part No
C1 ELST 100U 100V 2N710B
C2 ELST 100U 100V 2N710B
C3 MLC 100N 50V X7R 10% SM 2C410
C4 ELST 100U 100V 2N710B
C5 ELST 100U 100V 2N710B
C6 ELST 22U 63V 2N622
C7 ELST 10U 50V 2N610
C8 ELST 22U 63V 2N622
C9 ELST 10U 50V 2N610
C10 ELST 10U 50V 2N610
C11 ELST 1U0 50V 2N510
C12 PPRO 4N7 63V 5% RA 2D247N
C13 SUPPR CAP 4N7 250V 2K247
C14 PPRO 150P 5% 63V RA 2D115
C15 ELST 10U 50V 2N610
C16 ELST 10U 50V 2N610
C17 ELST 10U 50V 2N610
C18 ELST TNC 10m 63V RA 40mm 2N910A
C19 ELST TNC 10m 63V RA 40mm 2N910A
C20 PPRO 4N7 63V 5% RA 2D247N
C21 PPRO 4N7 63V 5% RA 2D247N
C22 ELST 100U 25V 2N710
C23 ELST 100U 25V 2N710
C24 ELST 100U 25V 2N710
C25 ELST 100U 25V 2N710
C26 ELST 100U 25V 2N710
C27 ELST 100U 25V 2N710
C28 MLC 470P 100V NPO 5% SM 2C147
C29 MLC 470P 100V NPO 5% SM 2C147
C30 MLC 470P 100V NPO 5% SM 2C147
C31 MLC 100N 50V X7R 10% SM 2C410
C32 ELST 22U 63V 2N622
C33 ELST 22U 63V 2N622
C34 MLC 100N 50V X7R 10% SM 2C410
C35 PPRO 150P 5% 63V RA 2D115
C36 PPRO 4N7 63V 5% RA 2D247N
C37 PPRO 1N0 5% 63V RA 2D210
C38 PPRO 680P 63V 5% RA 2D168
C39 PPRO 680P 63V 5% RA 2D168
C40 MLC 10N 50V X7R 10% SM 2C310
C41 MLC 10N 50V X7R 10% SM 2C310
C42 MLC 10N 50V X7R 10% SM 2C310
C43 MLC 10N 50V X7R 10% SM 2C310
C44 SUPPR CAP 4N7 250V 2K247
C45 ELST 10U 50V 2N610
C46 SUPPR CAP 4N7 250V 2K247
C47 SUPPR CAP 4N7 250V 2K247
C48 ELST 3M3 25V 2N833
C49 PPRO 1N0 5% 63V RA 2D210
C50 ELST 1U0 50V 2N510
C51 ELST 220U 16V 2N722
C52 ELST 220U 16V 2N722
C53 ELST 220U 16V 2N722
C54 ELST 220U 16V 2N722
C55 PCRB 100N 100V 10% RA 5mm 2H410
C56 PCRB 100N 100V 10% RA 5mm 2H410
C57 PCRB 100N 100V 10% RA 5mm 2H410
C58 PCRB 100N 100V 10% RA 5mm 2H410
C59 PCRB 100N 100V 10% RA 5mm 2H410
C60 PCRB 100N 100V 10% RA 5mm 2H410
C61 PPRO 100P 63V 5% RA 2D110N
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C62 PPRO 100P 63V 5% RA 2D110N
C63 PPRO 150P 5% 63V RA 2D115
C64 PPRO 330P 5% 63V RA 2D133
C65 PPRO 150P 5% 63V RA 2D115
C66 PPRO 330P 5% 63V RA 2D133
C67 PEST 15N 63V 5% 2K315
C68 PEST 15N 63V 5% 2K315
C69 PSTY 56P 160V ENCAP 1PF% 2F056
C70 PSTY 56P 160V ENCAP 1PF% 2F056
C71 ELST NON POLAR 10UF 35V 2U610
C72 ELST NON POLAR 10UF 35V 2U610
C73 ELST NON POLAR 10UF 35V 2U610
C74 ELST NON POLAR 10UF 35V 2U610
C75 PEST 47N 63V 10% 2K347
C76 PEST 47N 63V 10% 2K347
C77 PEST 47N 63V 10% 2K347
C78 PEST 47N 63V 10% 2K347
C79 ELST NON POLAR 10UF 35V 2U610
C80 ELST NON POLAR 10UF 35V 2U610
C81 MLC 22P 100V NPO 5% SM 2C022
C82 MLC 22P 100V NPO 5% SM 2C022
C83 ELST 100U 25V 2N710
C84 MLC 100N 50V X7R 10% SM 2C410
C85 MLC 100N 50V X7R 10% SM 2C410
C86 MLC 100N 50V X7R 10% SM 2C410
C87 MLC 100N 50V X7R 10% SM 2C410
C88 MLC 100N 50V X7R 10% SM 2C410
C89 MLC 100N 50V X7R 10% SM 2C410
C90 ELST 10U 50V 2N610
C91 PPRO 680P 63V 5% RA 2D168
C92 MLC 10N 50V X7R 10% SM 2C310
C93 MLC 1N0 50V X7R 10% SM 2C210
C94 MLC 10N 50V X7R 10% SM 2C310
C95 ELST 10U 50V 2N610
C96 ELST 10U 50V 2N610
C97 MLC 100N 50V X7R 10% SM 2C410
C98 MLC 10N 50V X7R 10% SM 2C310
C99 CERD 10PF 63V 10% 2A010
C100 CERD 10PF 63V 10% 2A010
D1 ZENER 15V 400MW 3C11504
D2 ZENER 15V 400MW 3C11504
D3 ZENER 10V 400MW 3C11004
D4 ZENER 10V 400MW 3C11004
D5 ZENER 10V 400MW 3C11004
D6 ZENER 10V 400MW 3C11004
D7 ZENER 10V 400MW 3C11004
D8 ZENER 10V 400MW 3C11004
D9 ZENER 10V 400MW 3C11004
D10 RECTIFIER 6A40 6A 400V 3B6A40
D11 RECTIFIER 6A40 6A 400V 3B6A40
D12 RECTIFIER 6A40 6A 400V 3B6A40
D13 RECTIFIER 6A40 6A 400V 3B6A40
D14 RECTIFIER 1N4003F 1A 200V 3B4003
D15 RECTIFIER 1N4003F 1A 200V 3B4003
D16 SSDIODE 1N4148 75V 3A4148
D17 SSDIODE 1N4148 75V 3A4148
D18 RECTIFIER 1N4003F 1A 200V 3B4003
D19 RECTIFIER 1N4003F 1A 200V 3B4003
D20 SSDIODE 1N4148 75V 3A4148
D21 RECTIFIER 1N4003F 1A 200V 3B4003
D22 RECTIFIER 1N4003F 1A 200V 3B4003
D23 RECTIFIER 1N4003F 1A 200V 3B4003
D24 RECTIFIER 1N4003F 1A 200V 3B4003
D25 RECTIFIER 1N4003F 1A 200V 3B4003
D26 SSDIODE 1N4148 75V 3A4148
D27 RECTIFIER 1N4003F 1A 200V 3B4003
D28 SSDIODE 1N4148 75V 3A4148
D29 ZENER 4V7 400MW 3C04704
D30 SSDIODE 1N4148 75V 3A4148
D31 SSDIODE 1N4148 75V 3A4148
D32 SSDIODE 1N4148 75V 3A4148
D33 SSDIODE 1N4148 75V 3A4148
D34 SSDIODE 1N4148 75V 3A4148
D35 SSDIODE 1N4148 75V 3A4148
D36 SSDIODE 1N4148 75V 3A4148
D37 SSDIODE 1N4148 75V 3A4148
D38 SSDIODE 1N4148 75V 3A4148
D39 ZENER 12V 3W SM 3C03C12
D40 SSDIODE 1N4148 75V 3A4148
D41 ZENER 12V 3W SM 3C03C12
D42 SSDIODE 1N4148 75V 3A4148
D43 ZENER 5V6 400MW 3C05604
D44 ZENER 24V 3W SM 3C03C24
D45 RECTIFIER 1N4003F 1A 200V 3B4003
D46 SSDIODE 1N4148 75V 3A4148
D47 SSDIODE 1N4148 75V 3A4148
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D48 ZENER 4V7 400MW 3C04704
D49 SSDIODE 1N4148 75V 3A4148
D50 ZENER 5V6 400MW 3C05604
F4 FUSE 20mm 2.5A AS C12256
F4 INS COVER PCB FUSEHOLDER F022
F4 FUSEHOLDER 20mm PCB 8S004
F5 FUSEHOLDER 20mm PCB 8S004
F5 INS COVER PCB FUSEHOLDER F022
HS1 HEATSINK CLIP TO220 13/8.6 DC/W F006
HS1 HEATSINK TO220 13 DEGC/W F005
HS3 HEATSINK TO220 CLIP 23DEG/W F004
HS5 CARBON THERMAL PAD E816MC
HS5 HEATSINK TO247 CLIP 2DEGC/W E803HK E803HK
HS5 HEATSINK CLIP TO220 13/8.6 DC/W F006
HS7 HEATSINK TO220 CLIP 23DEG/W F004
HS9 HEATSINK CLIP TO220 13/8.6 DC/W F006
HS9 CARBON THERMAL PAD E816MC
HS9 HEATSINK TO247 CLIP 2DEGC/W E803HK E803HK
HS10 HEATSINK TO220 CLIP 23DEG/W F004
HS11 HEATSINK TO247 CLIP 2DEGC/W E803HK E803HK
HS11 HEATSINK CLIP TO220 13/8.6 DC/W F006
HS11 CARBON THERMAL PAD E816MC
HS12 CARBON THERMAL PAD E816MC
HS12 HEATSINK TO247 CLIP 2DEGC/W E803HK E803HK
HS12 HEATSINK CLIP TO220 13/8.6 DC/W F006
HS13 HEATSINK TO220 CLIP 23DEG/W F004
HS14 HEATSINK TO220 CLIP 23DEG/W F004
L1 INDUCT 2U2 15x25mm AD2018 7D002A
L2 INDUCT 2U2 15x25mm AD2018 7D002A
L3 27mH INDUCTOR 7D327
LED1P LED RED/GREEN 5MM 3D002
LK9P JUMPER 4-WAY LEAD L836CA
O1 OPTO ISOLATOR 4N35 5T4N35
PCB PRINTED CIRCUIT BOARD L829PB
Q1 TRANS AUDIO DRIVER N 2SC5248 4B5248
Q2 TRANS AUDIO DRIVER N 2SC5248 4B5248
Q3 TRANS AUDIO DRIVER N 2SC5248 4B5248
Q4 TRANS AUDIO DRIVER P 2SA1964 4B1964
Q5 TRANS AUDIO DRIVER P 2SA1964 4B1964
Q6 TRANS AUDIO DRIVER P 2SA1964 4B1964
Q7 TRANS LF SS P SM BC856B 4A856B
Q8 TRANS LF SS N SM BC846B 4A846B
Q9 TRANS LF SS N SM BC846B 4A846B
Q10 TRANS LF SS N SM BC846B 4A846B
Q11 TRANS LF SS N SM BC846B 4A846B
Q12 TRANS LF SS N SM BC847B 4A847
Q13 TRANS POWER MOSFET IRPF360LC 4K360
Q14 TRANS POWER MOSFET IRPF360LC 4K360
Q15 TRANS POWER MOSFET IRPF360LC 4K360
Q16 TRANS POWER MOSFET IRPF360LC 4K360
Q17 TRANS LF SS N SM BC849B 4A849B
Q18 TRANS LF SS N SM BC849B 4A849B
Q19 TRANS LF SS N SM BC849B 4A849B
Q20 TRANS LF SS N SM BC849B 4A849B
Q21 TRANS LF SS N SM BC849B 4A849B
Q22 TRANS LF SS N SM BC849B 4A849B
Q23 TRANS LF SS N SM BC849B 4A849B
Q24 TRANS LF SS N SM BC849B 4A849B
Q25 TRANS LF SS N SM BC849B 4A849B
Q26 TRANS LF SS N SM BC849B 4A849B
Q27 TRANS LF SS N SM BC849B 4A849B
Q28 TRANS LF SS N SM BC849B 4A849B
Q29 TRANS LF SS N SM BC849B 4A849B
Q30 TRANS LF SS N SM BC849B 4A849B
Q31 TRANS LF SS N SM BC849B 4A849B
Q32 TRANS LF SS N 2SC2547 4A2546
Q33 TRANS LF SS P 2SA1085 4A1085
Q34 TRANS LF SS N SM BC849B 4A849B
Q35 TRANS LF SS N 2SC2547 4A2546
Q36 TRANS LF SS P 2SA1085 4A1085
Q37 TRANS LF SS N SM BC849B 4A849B
Q38 TRANS LF SS P 2SA1085 4A1085
Q39 TRANS LF SS N SM BC849B 4A849B
Q40 TRANS LF SS N 2SC2547 4A2546
Q41 TRANS LF SS N 2SC2547 4A2546
Q42 TRANS LF SS N SM BC847B 4A847
Q43 TRANS LF SS N 2SC2547 4A2546
Q44 TRANS LF SS N 2SC2547 4A2546
Q45 TRANS LF SS N 2SC2547 4A2546
Q46 TRANS LF SS N 2SC2547 4A2546
Q47 TRANS LF SS N 2SC2547 4A2546
Q48 TRANS LF SS P SM BC856B 4A856B
Q49 TRANS LF SS P SM BC856B 4A856B
Q50 TRANS LF SS P SM BC856B 4A856B
Q51 TRANS LF SS P SM BC856B 4A856B
Q52 TRANS LF SS P SM BC859B 4A859B
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ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
Q53 TRANS LF SS P SM BC859B 4A859B
Q54 TRANS LF SS P SM BC859B 4A859B
Q55 TRANS LF SS P SM BC859B 4A859B
Q56 TRANS LF SS P SM BC859B 4A859B
Q57 TRANS LF SS P SM BC859B 4A859B
Q58 TRANS LF SS P SM BC859B 4A859B
Q59 TRANS LF SS N SM BC849B 4A849B
Q60 TRANS LF SS P SM BC859B 4A859B
Q61 TRANS LF SS N SM BC849B 4A849B
Q62 TRANS LF SS N SM BC849B 4A849B
R1 RES MF FU W3 1R0 5% NFR25 1G810
R2 RES MF FU W3 1R0 5% NFR25 1G810
R3 RES MF FU W3 1R0 5% NFR25 1G810
R4 RES CF 1W 330R 5% 1E133
R5 RES CF 1W 330R 5% 1E133
R6 RES CF W2 100R 5% 1D110
R7 RES MF FU W3 470R 5% NFR25 1G147
R8 RES MF FU W3 470R 5% NFR25 1G147
R9 RES MF FU W3 220R 5% NFR25 1G122
R10 RES MF FU W3 220R 5% NFR25 1G122
R11 RES MF FU W3 1K0 5% NFR25 1G210
R12 RES MF FU W3 470R 5% NFR25 1G147
R13 RES MF FU W3 470R 5% NFR25 1G147
R14 RES MF FU W3 220R 5% NFR25 1G122
R15 RES MF FU W3 220R 5% NFR25 1G122
R16 RES MF FU W3 1K0 5% NFR25 1G210
R17 RES MF FU W3 470R 5% NFR25 1G147
R18 RES MF FU W3 470R 5% NFR25 1G147
R19 RES MF FU W3 1K0 5% NFR25 1G210
R20 RES MF FU W3 1K0 5% NFR25 1G210
R21 RES MF FU W3 1K0 5% NFR25 1G210
R22 RESISTOR SM W8 220R 1% 1A122A
R23 RESISTOR SM W8 220R 1% 1A122A
R24 RESISTOR SM W8 2K4 1% 1A224A
R25 RESISTOR SM W8 2K4 1% 1A224A
R26 RESISTOR SM W4 22K 2% 1A322
R27 RESISTOR SM W4 22K 2% 1A322
R28 RESISTOR SM W4 10K 2% 1A310
R29 RESISTOR SM W4 1K5 2% 1A215
R30 RESISTOR SM W4 120K 2% 1A412
R31 RESISTOR SM W4 120K 2% 1A412
R32 RESISTOR SM W4 100K 2% 1A410
R33 RESISTOR SM W4 12K 2% 1A312
R34 RESISTOR SM W4 11K 2% 1A311
R35P RESISTOR SM W4 0R0 2% 1A000
R35 RESISTOR SM W4 1K0 2% 1A210
R36 RESISTOR SM W4 47K 2% 1A347
R37 RESISTOR SM W4 22K 2% 1A322
R38 RESISTOR SM W4 47K 2% 1A347
R39 RESISTOR SM W4 47K 2% 1A347
R40 RESISTOR SM W4 22K 2% 1A322
R41 RESISTOR SM W4 47K 2% 1A347
R42 RESISTOR SM W4 47K 2% 1A347
R43 RESISTOR SM W4 47K 2% 1A347
R44 RESISTOR SM W4 47K 2% 1A347
R45 RESISTOR SM W4 47K 2% 1A347
R46 RESISTOR SM W4 47K 2% 1A347
R47 RESISTOR SM W4 68K 2% 1A368
R48 RESISTOR SM W4 180R 2% 1A118
R49 RES CF W2 100R 5% 1D110
R50 RES MF FU W3 100R 5% NFR25 1G110
R51 RES MF FU W3 10R 5% NFR25 1G010
R52 RES MF FU W3 10R 5% NFR25 1G010
R53 RES CF 2W 220R 5% 1C122
R54 RES MF FU W3 100R 5% NFR25 1G110
R55 RES MF FU W3 10R 5% NFR25 1G010
R56 RES MF FU W3 10R 5% NFR25 1G010
R57 RES CF 2W 220R 5% 1C122
R58 RESISTOR SM W4 47R 2% 1A047
R59 RESISTOR SM W4 1M0 2% 1A510
R60 RESISTOR SM W4 1M0 2% 1A510
R61 RESISTOR SM W4 2M2 2% 1A522
R62 RESISTOR SM W4 1M0 2% 1A510
R63 RESISTOR SM W4 1M0 2% 1A510
R64 RESISTOR SM W4 2M2 2% 1A522
R65 RESISTOR SM W4 220R 2% 1A122
R65P RESISTOR SM W4 0R0 2% 1A000
R66 RESISTOR SM W4 47R 2% 1A047
R67 RESISTOR SM W4 47R 2% 1A047
R68 RESISTOR SM W4 10K 2% 1A310
R69 RESISTOR SM W4 10K 2% 1A310
R70 RESISTOR SM W4 10K 2% 1A310
R71 RESISTOR SM W4 4K7 2% 1A247
R72 RESISTOR SM W4 100R 2% 1A110
R73 RESISTOR SM W4 100R 2% 1A110
R74 RESISTOR SM W4 100R 2% 1A110
7
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ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
R75 RESISTOR SM W4 1K0 2% 1A210
R76 RESISTOR SM W4 100R 2% 1A110
R77 RESISTOR SM W4 100R 2% 1A110
R78 RESISTOR SM W4 100R 2% 1A110
R79 RESISTOR SM W4 1K0 2% 1A210
R80P RESISTOR SM W4 0R0 2% 1A000
R80 RESISTOR SM W4 10K 2% 1A310
R81 RESISTOR SM W4 180R 2% 1A118
R82 RESISTOR SM W4 180R 2% 1A118
R83P RESISTOR SM W4 0R0 2% 1A000
R83 RESISTOR SM W4 100R 2% 1A110
R84 RES MO 3W 5% 0R22 KOASPR3 1Q922
R85 RES MO 3W 5% 0R22 KOASPR3 1Q922
R86 RES MO 3W 5% 0R22 KOASPR3 1Q922
R87 RES MO 3W 5% 0R22 KOASPR3 1Q922
R88 RES MO 3W 5% 0R22 KOASPR3 1Q922
R89 RES MO 3W 5% 0R22 KOASPR3 1Q922
R90 RES MO 3W 5% 0R22 KOASPR3 1Q922
R91 RES MO 3W 5% 0R22 KOASPR3 1Q922
R92 RESISTOR SM W4 47R 2% 1A047
R93 RESISTOR SM W4 47R 2% 1A047
R94 RESISTOR SM W4 150R 2% 1A115
R95 RESISTOR SM W4 47R 2% 1A047
R96 RESISTOR SM W4 47R 2% 1A047
R97 RESISTOR SM W4 150R 2% 1A115
R98 RESISTOR SM W4 27K 2% 1A327
R99 RESISTOR SM W4 470R 2% 1A147
R100 RESISTOR SM W4 4K7 2% 1A247
R101 RESISTOR SM W4 470R 2% 1A147
R102 RESISTOR SM W4 68K 2% 1A368
R103 RESISTOR SM W4 68K 2% 1A368
R104 RESISTOR SM W4 120K 2% 1A412
R105 RESISTOR SM W4 68K 2% 1A368
R106 RESISTOR SM W4 68K 2% 1A368
R107 RESISTOR SM W4 120K 2% 1A412
R108 RESISTOR SM W4 1K2 2% 1A212
R109 RESISTOR SM W4 1K2 2% 1A212
R110 RES CF 1W 1R5 5% 1E815
R111 RES CF 1W 1R5 5% 1E815
R112 RES CF 1W 5R6 5% 1E856
R113 RES CF 1W 5R6 5% 1E856
R114 RESISTOR SM W4 47R 2% 1A047
R115 RESISTOR SM W4 1K5 2% 1A215
R116 RESISTOR SM W4 10K 2% 1A310
R117 RESISTOR SM W4 1K5 2% 1A215
R118 RESISTOR SM W4 33K 2% 1A333
R119 RESISTOR SM W4 33K 2% 1A333
R120 RESISTOR SM W4 33K 2% 1A333
R121 RESISTOR SM W4 33K 2% 1A333
R122 RESISTOR SM W4 33K 2% 1A333
R123 RESISTOR SM W4 33K 2% 1A333
R124 RESISTOR SM W4 33K 2% 1A333
R125 RESISTOR SM W4 33K 2% 1A333
R126 RESISTOR SM W4 33K 2% 1A333
R127 RESISTOR SM W4 33K 2% 1A333
R128 RESISTOR SM W4 22K 2% 1A322
R129 RESISTOR SM W4 220R 2% 1A122
R130 RESISTOR SM W4 220R 2% 1A122
R131 RESISTOR SM W4 220R 2% 1A122
R132 RESISTOR SM W4 220R 2% 1A122
R133 RESISTOR SM W4 220R 2% 1A122
R134 RESISTOR SM W4 220R 2% 1A122
R135 RESISTOR SM W4 220R 2% 1A122
R136 RESISTOR SM W4 220R 2% 1A122
R137 RESISTOR SM W4 100K 2% 1A410
R138 RES MF FU W3 220R 5% NFR25 1G122
R139 RES MF FU W3 100R 5% NFR25 1G110
R140 RES MF FU W3 100R 5% NFR25 1G110
R141 RES MF FU W3 220R 5% NFR25 1G122
R142 RESISTOR SM W4 4K7 2% 1A247
R143 RES MF FU W3 220R 5% NFR25 1G122
R144 RES MF FU W3 100R 5% NFR25 1G110
R145 RES MF FU W3 100R 5% NFR25 1G110
R146 RES MF FU W3 220R 5% NFR25 1G122
R147 RESISTOR SM W4 470R 2% 1A147
R148 RES MF FU W3 1K0 5% NFR25 1G210
R149 RES MF FU W3 1K0 5% NFR25 1G210
R150 RES MF FU W3 470R 5% NFR25 1G147
R151 RES MF FU W3 1K0 5% NFR25 1G210
R152 RES MF FU W3 1K0 5% NFR25 1G210
R153 RES MF FU W3 470R 5% NFR25 1G147
R154 RESISTOR SM W4 2K2 2% 1A222
R155 RESISTOR SM W4 2K2 2% 1A222
R156 RESISTOR SM W4 2K2 2% 1A222
R157 RESISTOR SM W4 2K2 2% 1A222
R158 RESISTOR SM W4 1K5 2% 1A215
8
Page 10
ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
R159 RESISTOR SM W4 1K5 2% 1A215
R160 RESISTOR SM W4 100R 2% 1A110
R161 RESISTOR SM W4 100R 2% 1A110
R162 RESISTOR SM W4 100R 2% 1A110
R163 RESISTOR SM W4 100R 2% 1A110
R164 RESISTOR SM W8 560R 1% 1A156A
R165 RESISTOR SM W8 560R 1% 1A156A
R166 RESISTOR SM W4 2K2 2% 1A222
R167 RESISTOR SM W4 2K2 2% 1A222
R168 RESISTOR SM W4 220R 2% 1A122
R169 RESISTOR SM W4 220R 2% 1A122
R170 RES MF W4 22K 1% 1H322
R171 RES MF W4 22K 1% 1H322
R172 RESISTOR SM W4 10R 2% 1A010
R173 RESISTOR SM W4 470R 2% 1A147
R174 RESISTOR SM W4 10R 2% 1A010
R175 RESISTOR SM W4 4K7 2% 1A247
R176 RESISTOR SM W4 470K 2% 1A447
R177 RESISTOR SM W4 470K 2% 1A447
R178 RESISTOR SM W4 470K 2% 1A447
R179 RESISTOR SM W4 470K 2% 1A447
R180 RESISTOR SM W8 47K 1% 1A347A
R181 RESISTOR SM W8 47K 1% 1A347A
R182 RESISTOR SM W8 2K7 1% 1A227A
R183 RESISTOR SM W8 2K7 1% 1A227A
R184 RESISTOR SM W4 100K 2% 1A410
R185 RESISTOR SM W4 100K 2% 1A410
R186 RESISTOR SM W4 120K 2% 1A412
R187 RESISTOR SM W8 8K2 1% 1A282A
R188 RESISTOR SM W8 8K2 1% 1A282A
R189 RESISTOR SM W4 27K 2% 1A327
R190 RESISTOR SM W4 1M0 2% 1A510
R191 RESISTOR SM W4 27K 2% 1A327
R192 RESISTOR SM W4 470K 2% 1A447
R193 RESISTOR SM W4 22R 2% 1A022
R194 RESISTOR SM W4 22R 2% 1A022
R195 RESISTOR SM W4 22R 2% 1A022
R196 RESISTOR SM W4 22R 2% 1A022
R197 RESISTOR SM W4 100K 2% 1A410
R198 RESISTOR SM W4 4K7 2% 1A247
R199 RES MF FU W3 1R0 5% NFR25 1G810
R200 RES CF 1W 2K7 5% 1E227
R201 RESISTOR SM W4 22K 2% 1A322
R202 RESISTOR SM W4 100K 2% 1A410
R203 RESISTOR SM W4 2K4 2% 1A224
R204 RESISTOR SM W4 10K 2% 1A310
R205 RES CF 1W 5% 6K8 1E268
R206 RESISTOR SM W4 100K 2% 1A410
R207 RESISTOR SM W4 100K 2% 1A410
R208 RESISTOR SM W4 470R 2% 1A147
R209 RESISTOR SM W4 4K7 2% 1A247
R210 RESISTOR SM W4 1K5 2% 1A215
R211 RESISTOR SM W4 4K7 2% 1A247
R212 RESISTOR SM W4 1K5 2% 1A215
R213 RESISTOR SM W4 47R 2% 1A047
R214 RESISTOR SM W4 4K7 2% 1A247
R215 RESISTOR SM W4 4K7 2% 1A247
R216 RESISTOR SM W4 1K0 2% 1A210
R217 RESISTOR SM W4 10K 2% 1A310
R218P RESISTOR SM W4 220R 2% 1A122
R218 RESISTOR SM W4 120K 2% 1A412
R219 RESISTOR SM W4 10K 2% 1A310
R220 RESISTOR SM W4 100K 2% 1A410
R221 RES CF 1W 470R 5% 1E147
R222 RESISTOR SM W4 100K 2% 1A410
R223 RESISTOR SM W4 10K 2% 1A310
R224 RES MF FU W3 10R 5% NFR25 1G010
R225 RESISTOR SM W4 10K 2% 1A310
R226 RESISTOR SM W4 10K 2% 1A310
R227 RES MF W4 10R 1% 1H010
R228 RES CF 1W 2K7 5% 1E227
R229 RES CF 1W 2K7 5% 1E227
R230 RESISTOR SM W4 47K 2% 1A347
R231 RESISTOR SM W4 47K 2% 1A347
R232 RESISTOR SM W4 1K0 2% 1A210
R233 RESISTOR SM W4 3K3 2% 1A233
R234 RESISTOR SM W4 3K3 2% 1A233
R235 RESISTOR SM W4 100K 2% 1A410
R236 RESISTOR SM W4 10K 2% 1A310
R237 RESISTOR SM W4 1K5 2% 1A215
R238 RESISTOR SM W4 1K8 2% 1A218
R239 RESISTOR SM W4 1K8 2% 1A218
RLY1 RLY SPST 24V SPKR A213
RLY2 RLY SPST 24V SPKR A213
RLY3 RLY SPST 24V SPKR A213
RLY4 RLY SPST 24V SPKR A213
9
Page 11
ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
RLY6 RELAY MAINS 24V 10A A212
RLY7 RELAY MAINS DPDT 12V 5A A211
SH1 MAINS EMC SHIELD E5402
SH2 PHONO EMC SHIELD E808MC
SK1 PHONO SKT 4-WAY EMC GOLD 8D225
SK2 CAMCON BINDING POST 4WAY GOLD 8D417G
SK3 CAMCON BINDING POST 4WAY GOLD 8D417G
SK4 IEC MAINS CONN PCB INS PX 8A001
SK5 STEREO JACK PCB 8D301
SK6 22-WAY FFC CONN 8K8022
SK7 CAGE CLAMP 16A 3 WAY 8Q001
SK8 CAGE CLAMP 16A 4 WAY 8Q002
SK9 CAGE CLAMP 16A 1 WAY ARC003-236 8Q003
SK10 MIN JACK DUAL 3.5mm HSJ1002-01-1020 8D302
SKT1 JST 6 WAY HEADER 8K709
SW2 SW PUSH 2PCO A1008
SW3 SW PUSH 2PCO A1008
SW4 SW PUSH 2PCO A1008
SW5 SW PUSH 2PCO A1008
TH2 THERMISTOR MAINS SURGE 1T004
TH3 THERMISTOR MAINS SURGE 1T004
TX1 ALPHA10 AMP POWER TX 230V L831TX
TX2 ALPHA 10 AMP 230V/115V TRANSFORMER L825TX
X1 CER RESON 4.00MHz 7W005
Y1 TX WIRE RESTRAINT F185
Y2 TX WIRE RESTRAINT F185
Z1 IC VREG POS LM317T 5D317T
Z2 IC VREG POS LM337T 5D337
Z3 IC AUDIO SM DUAL TL072 5B072D
Z4 IC AUDIO SM DUAL TL072 5B072D
Z5 IC COMPARITOR TA7317P 5M7317
Z6 IC VREG POS 7805 5D7805
Z7 IC VREG POS 7808 5D7808
Z8 IC COMPARITOR SM DUAL LM393A 5M393AD
Z9 IC SOCKET 28 NARROW 8S028N
Z9 IC CMOS MICRO HT48R30 28-DIP-B-0 5B483028
Z10 IC THERMOSTAT SM LM56CIM 5M56
Z11 IC THERMOSTAT SM LM56CIM 5M56
Z12 IC CMOS EPROM 24C02 SM 5G2402
Z13 IC COMPARITOR SM DUAL LM393A 5M393AD
ALPHA 10 PREAMPLIFIER BOARD PARTS LIST
Ref No. Description Part No.
C1 ELST NON POLAR 10UF 35V 2U610
C2 ELST 22U 63V 2N622
C3 ELST NON POLAR 10UF 35V 2U610
C4 ELST 22U 63V 2N622
C8 MLC 1N0 50V X7R 10% SM 2C210
C9 MLC 1N0 50V X7R 10% SM 2C210
C10 PPRO 680P 5% 63V RA 2D168
C11 PPRO 680P 5% 63V RA 2D168
C13 MLC 47P 100V NPO 5% SM 2C047
C14 MLC 47P 100V NPO 5% SM 2C047
C15 MLC 47P 100V NPO 5% SM 2C047
C16 MLC 47P 100V NPO 5% SM 2C047
C17 MLC 47P 100V NPO 5% SM 2C047
C18 MLC 47P 100V NPO 5% SM 2C047
C19 MLC 47P 100V NPO 5% SM 2C047
C20 MLC 47P 100V NPO 5% SM 2C047
C21 MLC 47P 100V NPO 5% SM 2C047
C22 MLC 47P 100V NPO 5% SM 2C047
C23 MLC 47P 100V NPO 5% SM 2C047
C24 MLC 47P 100V NPO 5% SM 2C047
C25 MLC 47P 100V NPO 5% SM 2C047
C26 MLC 47P 100V NPO 5% SM 2C047
C31 ELST 22U 63V 2N622
C32 ELST 22U 63V 2N622
C33 MLC 1N0 50V X7R 10% SM 2C210
C34 MLC 1N0 50V X7R 10% SM 2C210
C35 MLC 1N0 50V X7R 10% SM 2C210
C36 MLC 1N0 50V X7R 10% SM 2C210
C37 MLC 1N0 50V X7R 10% SM 2C210
C38 MLC 1N0 50V X7R 10% SM 2C210
D1 ZENER 6V8 400MW 3C06804
D2 ZENER 6V8 400MW 3C06804
LK1 JUMPER 8-WAY LEAD FOR A10 PRE-AMP L823CA
LK2 JUMPER 8-WAY LEAD FOR A10 PRE-AMP L832CA
PCB PRINTED CIRCUIT BOARD L832PB
PL6 16 WAY DIL PIN HEADER 8K6316
R1 RESISTOR SM W4 1K0 2% 1A210
R2 RESISTOR SM W4 1K0 2% 1A210
R3 RESISTOR SM W4 56R 2% 1A056
10
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ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
R4 RESISTOR SM W4 56R 2% 1A056
R5 RESISTOR SM W4 1K8 2% 1A218
R6 RESISTOR SM W4 100K 2% 1A410
R7 RESISTOR SM W4 100K 2% 1A410
R14 RESISTOR SM W4 10K 2% 1A310
R17 RESISTOR SM W4 1K0 2% 1A210
R18 RESISTOR SM W4 1K0 2% 1A210
R19 RESISTOR SM W4 1K0 2% 1A210
R20 RESISTOR SM W4 1K0 2% 1A210
R21 RESISTOR SM W4 1K0 2% 1A210
R22 RESISTOR SM W4 1K0 2% 1A210
R23 RESISTOR SM W4 1K0 2% 1A210
R24 RESISTOR SM W4 1K0 2% 1A210
R25 RESISTOR SM W4 1K0 2% 1A210
R26 RESISTOR SM W4 1K0 2% 1A210
R27 RESISTOR SM W4 1K0 2% 1A210
R28 RESISTOR SM W4 1K0 2% 1A210
R29 RESISTOR SM W4 1K0 2% 1A210
R30 RESISTOR SM W4 1K0 2% 1A210
R31 RESISTOR SM W4 1K0 2% 1A210
R32 RESISTOR SM W4 1K0 2% 1A210
R33 RESISTOR SM W4 1K0 2% 1A210
R34 RESISTOR SM W4 1K0 2% 1A210
R38 RESISTOR SM W4 100K 2% 1A410
R39 RESISTOR SM W4 100K 2% 1A410
R40 RESISTOR SM W4 100K 2% 1A410
R41 RESISTOR SM W4 100K 2% 1A410
R44 RESISTOR SM W4 22K 2% 1A322
R45 RESISTOR SM W4 22K 2% 1A322
R46 RESISTOR SM W4 22K 2% 1A322
R47 RESISTOR SM W4 22K 2% 1A322
R48 RESISTOR SM W4 22K 2% 1A322
R49 RESISTOR SM W4 22K 2% 1A322
R50 RESISTOR SM W4 22K 2% 1A322
R51 RESISTOR SM W4 22K 2% 1A322
R52 RESISTOR SM W4 22K 2% 1A322
R53 RESISTOR SM W4 22K 2% 1A322
R54 RESISTOR SM W4 22K 2% 1A322
R55 RESISTOR SM W4 22K 2% 1A322
R56 RESISTOR SM W4 22K 2% 1A322
R57 RESISTOR SM W4 22K 2% 1A322
R58 RESISTOR SM W4 47R 2% 1A047
R59 RESISTOR SM W4 47R 2% 1A047
R60 RESISTOR SM W4 47R 2% 1A047
R61 RESISTOR SM W4 47R 2% 1A047
R62 RESISTOR SM W4 47R 2% 1A047
R63 RESISTOR SM W4 47R 2% 1A047
R64 RESISTOR SM W8 1K5 1% 1A215A
R65 RESISTOR SM W8 1K5 1% 1A215A
R66 RESISTOR SM W8 6K8 1% 1A268A
R67 RESISTOR SM W8 6K8 1% 1A268A
R68 RESISTOR SM W4 100K 2% 1A410
R69 RESISTOR SM W4 100K 2% 1A410
R70 RESISTOR SM W4 100K 2% 1A410
R71 RESISTOR SM W4 100K 2% 1A410
R72 RESISTOR SM W4 100K 2% 1A410
R73 RESISTOR SM W4 100K 2% 1A410
R74 RESISTOR SM W4 100K 2% 1A410
R75 RESISTOR SM W4 100K 2% 1A410
R76 RESISTOR SM W4 100K 2% 1A410
R77 RESISTOR SM W4 100R 2% 1A110
R80 RESISTOR SM W4 22K 2% 1A322
R81 RESISTOR SM W4 22K 2% 1A322
SK1 PHONO SKT 4-WAY EMC GOLD 8D225
SK2 PHONO SKT 4-WAY EMC GOLD 8D225
SK3 PHONO SKT 4-WAY EMC GOLD 8D225
SK4 PHONO SKT 4-WAY EMC GOLD 8D225
SK5 PHONO SKT 2-WAY EMC GOLD 8D226
SK7 22-WAY FFC CONN 8K8022
SK8 32-WAY FFC CONN VERT 8K8032
Z3 IC OPAMP DUAL SM OPA2134PA 5B2134
Z4 IC OPAMP DUAL SM OPA2134PA 5B2134
Z6 IC HCMOS SM MAX 4051 5K4051M
Z7 IC HCMOS SM MAX 4051 5K4051M
Z8 IC HCMOS SM MAX 4051 5K4051M
Z9 IC HCMOS SM MAX 4051 5K4051M
Z10 IC HCMOS SM MAX 4051 5K4051M
Z11 IC HCMOS SM MAX 4051 5K4051M
Z12 IC AUDIO SM DUAL TL072 5B072D
Z13 IC AUDIO SM DUAL TL072 5B072D
Z14 IC AUDIO DUAL VOLPOT LM1972 5C1972
ALPHA 10 DISPLAY BOARD PARTS LIST
11
Page 13
ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL
Ref No. Description Part No.
C1 CERD 100N 63V 20% RA 2A410
C2 ELST 470U 25V RA 2N747
C3 CERD 100N 63V 20% RA 2A410
C4 CERD 100N 63V 20% RA 2A410
C5 CERD 100N 63V 20% RA 2A410
C6 ELST 220U 16V 2N722
C8 CERD 100N 63V 20% RA 2A410
D1 SSDIODE 1N4148 75V 3A4148
D2 SSDIODE 1N4148 75V 3A4148
D3 SSDIODE 1N4148 75V 3A4148
D4 SSDIODE 1N4148 75V 3A4148
D5 SSDIODE 1N4148 75V 3A4148
D6 SSDIODE 1N4148 75V 3A4148
D7 SSDIODE 1N4148 75V 3A4148
D8 SSDIODE 1N4148 75V 3A4148
D9 SSDIODE 1N4148 75V 3A4148
D10 SSDIODE 1N4148 75V 3A4148
D11 SSDIODE 1N4148 75V 3A4148
L831PB PRINTED CIRCUIT BOARD L831PB
LED1 LED GREEN 5MM 3D001
LED2 LED GREEN 5MM 3D001
LED3 LED GREEN 5MM 3D001
LED4 LED GREEN 5MM 3D001
LED5 LED GREEN 5MM 3D001
LED6 LED GREEN 5MM 3D001
LED7 LED GREEN 5MM 3D001
LED100 LED RED/GREEN 5MM 3D002
LK1 LINK PLAIN 10mm 1X010A
LK3 JUMPER 3 WAY x 125mm L815CA
M1 NORITAKE ITRON CU20025RCPB-U1J B1010
Q1 TRANS LF SS P BC557B 4A557
Q2 TRANS MOSFET SW ZVNL120A 4K120
R1 RES MF FU W3 3R3R 5% NFR25 1G833
R2 RES MF W4 150R 1% 1H115
R3 RES MF W4 150R 1% 1H115
R4 RES MF W4 150R 1% 1H115
R5 RES MF W4 150R 1% 1H115
R6 RES MF W4 150R 1% 1H115
R7 RES MF W4 150R 1% 1H115
R8 RES MF W4 150R 1% 1H115
R9 RES MF W4 4K7 1% 1H247
R10 RES MF W4 4K7 1% 1H247
R11 RES MF W4 10K 1% 1H310
R12 RES MF W4 10K 1% 1H310
R13 RES MF W4 150R 1% 1H115
R14 RES MF W4 330R 1% 1H133
R15 RES MF W4 4K7 1% 1H247
R16 RES MF W4 4K7 1% 1H247
R17 RES MF W4 10K 1% 1H310
R18 RES MF W4 100R 1% 1H110
R19 RES MF W4 100R 1% 1H110
R20 RES MF W4 100K 1% 1H410
R21 RES MF W4 100R 1% 1H110
R22 RES MF W4 100K 1% 1H410
RP1 RES NETWORK 100Kx8 COMMON 1V410
RX1 REMOTE CONTROL RECEIVER SBX1610-62 38KHZ B2103
SK1 22-WAY FFC CONN HORIZ 8K8122
SK2 22-WAY FFC CONN HORIZ 8K8122
SK3 EC16B2414 A1211
SW1 TACT SWITCH 2-PIN LOW PROF A1504
SW2 TACT SWITCH 2-PIN LOW PROF A1504
SW3 TACT SWITCH 2-PIN LOW PROF A1504
SW4 TACT SWITCH 2-PIN LOW PROF A1504
SW5 TACT SWITCH 2-PIN LOW PROF A1504
SW6 TACT SWITCH 2-PIN LOW PROF A1504
SW7 TACT SWITCH 2-PIN LOW PROF A1504
SW8 TACT SWITCH 2-PIN LOW PROF A1504
SW9 TACT SWITCH 2-PIN LOW PROF A1504
SW10 TACT SWITCH 2-PIN LOW PROF A1504
SW11 TACT SWITCH 2-PIN LOW PROF A1504
X1 CER RESON 4.00MHz 7W005
Z1 IC VREG POS 7805 5D7805
Z2 40 PIN IC SOCKET 8S040
Z2 IC CMOS MICRO PIC16C65 5H16C65
12
Page 14
87654321
Replace with same
type component only
Pre-Amp Audio Input
SK11
1
2
3
4
5
6
7
D
SW1NC
C
2PCO_VERT
8
WTRAP2.5X8V
SCREENSCREENSCREENSCREEN
!
Chassis Connection
SH1
EMC Shield
L
B
A
SK4
IEC3
FD_2
FIDUCIAL
FD_1
FIDUCIAL
SJB
S.J.B.
SJB
DDM
PCB MATERIAL
FR4, 2 OZ Cu
FR4_2OZ
Kit Masks:
E
N
N E L
EMCMAINS
PD5
TOOLING
PD7
TOOLING
1) For Integrated Amp use...
N, F inclusive
2) For Power Amp use...
P,S,F inclusive
1 2 3 4 5 6 7 8
+15V
-15V
Pre_Outputs
SK1A
F
EMC
N
PHONO4G
C28
470P SM
RLY5NA
RLY 51SB12T
RLY5NB
RLY 51SB12T
LIVE
ATE_PAD
PD8
TOOLING
Fault
1
FIX1
FIX3
FIX8 FIX9
C46
4N7 MAINS
C47
4N7 MAINS
TH3
TH2
Q60
BC859B
R208
470R SM
SW1NA
2PCO_VERT
2
3
R35P
0R0 SM
PRE1
ATE_PAD
RLY6A
RLY SPDT 24V
PTHMAINS
PTHMAINS
Y1
TX WIRE CLIP
L&R Inputs
PRE2
ATE_PAD
R65P
0R0 SM
6
SW1NB
2PCO_VERT
3rd Ch. Power
SKT1
JST 6W HEADER
FIX4 FIX5 FIX6 FIX7
Y2
TX WIRE CLIP
AS4A_115V
F4
DDH
DD_A2H
DDV
DD_A2V
AS2A5
A2 Horizontal
Paper Marker
A2 Vertical
Paper Marker
BARCD
BARCODE
1
R80P
SK1B
4
5
1
ACDet
+SUP
2
3
4
5
6
-SUP
NEUTRAL
ATE_PAD
TXN
ATE_PAD
Dark Grey
Orange
CAGECLAMP3
F5
DD1
Drilling Detail
Issue Box
DD_ISSUE
BARCODE LABEL
Q7
BC856B
R128
22K SM
R26
22K SM
0R0 SM
F
N
PHONO4G
R83P
0R0 SM
PCB
L829PB
+15V
-15V
SK9
1
Green
CAGECLAMP1
TX115
ATE_PAD
SK7
Blue
C13
DDD
Drilling
Detail
DRILL_DWG
+
C95
R27 22K SM
R201 22K SM
PCB
ORANGE
230V
BROWN
115V
BLACK
0V
GRN/YEL
RLY DPDT 12V
1
2
3
TX230
ATE_PAD
4N7 MAINS
C22
R36
47K SM
10U EL
PWRAMPL
l829ct3_6.SCH
VI Latch VI Cut
ABiasRef
Input
R47
68K SM
PWRAMPR
l829ct4_6.SCH
VI Latch VI Cut
ABiasRef
Input
R48
180R SM
TX1
L831TX
BLUE
GREEN
BLUE
RLY7A
C44
4N7 MAINS
RLY7B
RLY DPDT 12V
UPDTBX
Update Box
UPDATE_BOX
PS
Photo Strip
PHOTO_STRIP
VI Cut-out latch
ROut
SGND1
ATE_PAD
ACDet
Fault
C96
D49
BAS16W SM
ACD1
ATE_PAD
D18
1N4003F
10R MF
LOut
RLY3A
RLY SPST SPKR
RLY1A
RLY SPST SPKR
+
10U EL
Q_48
+
7
5
115V
10U EL
VIRESET1
ATE_PAD
ABSUP
-SUP
SH2
0V
Output
Output
EMC Shield
EMCPHONO
TX2
L825TX
11V
13
0V
D115V
ATE_PAD
2
230V
D240V
ATE_PAD
12
11V
11
D19
1N4003F
ACD2
ATE_PAD
Designators ending in...
N - For integrated amp only,
P - For power amp only,
R - For power amp with remote only,
S - For power amp with no remote
only,
X - Other end of wire link.
R224
RLY4A
RLY SPST SPKR
RLY2A
RLY SPST SPKR
SPKA1
ATE_PAD
SPKA2
ATE_PAD
LVProt
RVProt
ACDet
Fault
RESET
CONTROL
l829ct2_6.SCH
R202
100K SM
D42
BAS16W SM
R216
1K0 SM
UREG1
ATE_PAD
C48
FIX2
SK5
LHC
RHC
HPSKT
Top+
Top-
Top+
Top-
R
C43
10N SM
C41
10N SM
SPKB2
ATE_PAD
Powerup
SPKB1
ATE_PAD
CAMCON_G
SK2A
C42
SK3A
C40
CAMCON_G
FAN
Reset Circuit
+
10U EL
I
C85
R217
100N SM
Digital Supply
C90
+UREG
+
3M3 EL
C94
10N SM
DRAWING TITLE
Alpha 10 Amp Main
23425
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
4
5
L
2
3
1
6
7
CAMCON_G
SK2B
Bot+
10N SM
Bot-
SK3B
Bot+
10N SM
Bot-
CAMCON_G
Fan
R71
D50
10K SM
HS2NA
TO220HS08REG
Vin
Z7
7808
R49
100R W2 CF
SK2C
CAMCON_G
C29
SK3C
CAMCON_G
C30
4K7 SM
Q_57
R29
5V6 400MW
D44
24V 3W SM
Vout
GND
G
HP1
HP2
R6
CHASS
470P SM
CHASS
470P SM
1K5 SM
HS
R4
330R 1W CF
R5
330R 1W CF
100R W2 CF
R82
180R SM
D16
Q42
BC847B
R35
1K0 SM
O
C86
100N SM
LOut
ROut
+UREG
BAS16W SM
RLY7C
D45
1N4003F
+8V
PDIG1
ATE_PAD
+
C45
+PRE
C101
47N PE
R81
180R SM
RLY DPDT 12V
-PRE
Q12
BC847B
10U EL
Circuit Diagram
Notes:
Filename
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\L829ct1_6.prj
! !
R1
1R0 FU
R3
Z1
LM317T
I
Vin
C32
ATE_PAD
+
PPRE1
C20
4N7 PP
C21
4N7 PP
C33
ATE_PAD
I
R2
1R0 FU
Fan
D46
LOut
HS3A
!
R230
Q_30
NPRE1
Q_55
!
R7
1R0 FU
Q1
2SC5248
HS6N
TO220HS23TR
+15V Regulator
Vout
ADJ
A
HS1A
TO220HS13REG
22U EL
+
C6
22U EL
+
C8
+
22U EL
A
Z2
LM337T
ADJ
Vin
TO220HS23REG
-15V Regulator
Q4
2SA1964
HS8N
TO220HS23TR
R199
1R0 FU
R232
1K0 SM
R231
47K SM
Q_47
BAS16W SM
D47
ROut
97_1086
D1
15V 400MW
O
HS
R22
220R SM1%
PAN1
C7
R24
2K4 SM1%
R25
R23
C88
100N SM
2K4 SM1%
220R SM1%
100N SM
22U EL
Vout
D2
15V 400MW
!
Q_56
C87
47K SM
BAS16W SM
O
22-9-9797_1085
SJB
26-9-97
SJB No Change
22-10-9797_1096
+15V
+
C9
NAN1
-15V
Q39
BC849B
470R FU
D3
+
+
10V 400MW
C18
10M EL 63V
C1
100U EL 100V
TXGND
ATE_PAD
ATE_PAD
10U EL
ATE_PAD
+
10U EL
+
ATE_PAD
C2
100U EL 100V
+
D4
10V 400MW
!
R8
470R FU
+UREG
Q59F
2SC5248
FANOUT
ATE_PAD
SKT2
SKT3
1
2
2
C89
1
MOLEX2MV
100N SM
MOLEX2MV
+8V
C31
Hardware Remote RX
C6 & C8 change from 10u to 22u
SJB HS2N change to larger size11-11-9797_1102
SJB PCB Issue 2 to 3 changes9-7-9898_1042
ECO No. DESCRIPTION OF CHANGE
Date Printed
INITIALS
10-Jul-1998
DATE
Drawn by:
SJB
PSUP1
ATE_PAD
PGND1
R229
C19
10M EL 63V
NSUP1
ATE_PAD
Z3C
TL072 SM
I
100N SM
1 5Sheet of
6A40
D10
R228
2K7 1W CF
Light Green
Light Green
AC1
ATE_PAD
ACDet
2K7 1W CF
D12
6A40
+15V
84
Control Supply
Vin
84
Z4C
TL072 SM
-15V
Z6
7805
GND
G
DRAWING NO.
D11
D13
Vout
Grey
Grey
+SUP
1N4003F
D14
6A40
SK8
1
2
3
4
AC2
ATE_PAD
6A40
D15
C38
680P PP
C39
680P PP
O
C10
L829CT1
CAGECLAMP4
-SUP
+5V
PMPU1
ATE_PAD
+
ISSUE
1N4003F
10U EL
2SJB
3
4
5
6
D
C
B
A
Page 15
D
Replace with same
type component only
Gain 29dB or 28.3x
INPUT1
Input
ATE_PAD
C
C64
R180
47K SM1%
B
R39
4K7 SM
ISERVO1
ATE_PAD
A
7
Auto-Bias Servo
1 2 3 4 5 6 7 8
R182
2K7 SM
R137
100K SM
R59
330P PP
R38
VSERVO1
Voltage Servo
Z3B
TL072 SM
C79
10U NP
1
C72
1M0 SM
47K SM
C71
10U NP
ATE_PAD
Z3A
TL072 SM
C67
10N SM
5
6
1
2
3
R187
Q_29
QPAD
SW2A
2PCO
8K2 SM1%
10U NP
Q19
BC849B
C75
47N PE
2
3
Q_3
R177
R184
100K SM
BSRef
R30
120K SM
QPAD
470K SM
R61
2M2 SM
Q53
Q_13
QPAD
22R SM
Q_4
QPAD
R176
470K SM
Q21
BC849B
R166
BC859B
Q_7
QPAD
Q_6
2K2 SM
R161
100R SM
Q_12
QPAD
Q52
BC859B
C37
1N0 PP
Q_58 Q_59
R193
R120
D31
R58
47R SM
Q20
BC849B
33K SM
BAS16W SM
R160
D32
Q_50
R194
100R SM
Q_11
QPAD
BAS16W SM
Q18
BC849B
22R SM
R119
33K SM
Q_5
QPAD
C99
Q_60
R164
560R SM1%
10P SM#A
R73
Q49
BC856B
C68
100P PPS SM
C69X
56P PS
R170
22K MF
R60
1
3 4
O2 TLP181 SM
Q9
BC846B
Q_8
QPAD
100R SM
Q_49
+15V
R72
100R SM
C106
100P PPS SM
R172
10R SM
R115
10K SM
Q_19
R168
1K8 SM
C104
100N SM
Q8
BC846B
C12
R67
!
Q_10
QPAD
Q22
BC849B
2K4 SM
4N7 PP
47R SM
6
R74
-15V
Q48
BC856B
!
R12
Q_43
R13
!
100R SM
470R FU
R158
R99
470R FU
Q33
2SA1085
Q41
2SC2547
C63
150P PP
R154
1K5 SM
C14
150P PP
R155
470R SM
Q2
2SC5248
!
R149
R75
1K0 SM
!
C61
R148
100P PP
DRAWING TITLE
Alpha 10 Amp L Ch.
23425
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
!
HS7
TO220HS23TR
2K2 SM
2K2 SM
1K0 FU
1K0 FU
R150
470R FU
R130
TO247HS2.8DEGC/W
R52
10R FU
R139
100R FU
R129
100R FU
!
D5
220R SM
+VI Protection
Q17
BC849B
10V 400MW
!
Q23
BC849B
R92
C51
R93
C52
R102
47R SM
+
R103
68K SM
R50
100R FU
R10
220R FU
47R SM
+
220U EL
68K SM
220U EL
R140
Q5
2SA1964
HS10
TO220HS23TR
R138
220R FU
!
R141
220R FU
220R SM
Circuit Diagram
Notes:
Filename
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\l829ct3_6.SCH
HS5
Q14
IRFP360LC
R131
220R SM
R132
220R SM
D6
10V 400MW
R85
220R FU
!
!
0R22 3W MO
HS9
Q13
IRFP360LC
R87
0R22 3W MO
R9
-VI Protection
D21
1N4003F
C76
47N PE
Bootstrap
R53
220R 2W CF
D39
12V 3W SM
R84
0R22 3W MO
C4
R104
120K SM
TO247HS2.8DEGC/W
R86
0R22 3W MO
IQ1
ATE_PAD
97_1085
97_1086
+
100U EL 100V
STABLE1
ATE_PAD
R112
5R6 2W CF#A
L1
R110
1R5 1W CF
VI Cut-out
R94
150R SM
+
R11 1K0 FU
!
R51
10R FU
C23
!
C57
SJB
SJB R50 change from 10R to 100R
100U EL
100N PC
22-9-97
26-9-97
22-10-9797_1096
R108
1K2 SM
ABiasRef
D17
BAS16W SM
Bias Level detector
Hardware Remote RX 2SJB
C64 change from 220P to 330P
2U2H LAC
R37
22K SM
Q32
2SC2547
2
3
C55
100N PC
Z8A
LM393A SM
C102
1N0 SM
SJB R61 & 168 changed. C99 added.11-11-9797_1102
SJB PCB Issue 2 to 3 changes9-7-9898_1042
ECO No. DESCRIPTION OF CHANGE
Date Printed
INITIALS
10-Jul-1998
DATE
Drawn by:
SJB
2 5Sheet of
OUTPUT1
ATE_PAD
VI Latch
VI Cut
ABSUP
R68
1
R240
DRAWING NO.
10K SM
Q_41
QPAD
100R SM
+SUP
Output
87654321
C56
100N PC
Q40
2SC2547
-SUP
L829CT3
R118
D
C
B
33K SM
A
3
4
5
6
ISSUE
Page 16
D
Replace with same
type component only
Gain 29dB or 28.3x
Input
C
B
ATE_PAD
R181
47K SM1%
R42
INPUT2
C66
4K7 SM
R183
2K7 SM
R197
100K SM
R62
330P PP
R41
VSERVO2
Voltage Servo
1
C74
1M0 SM
47K SM
C73
10U NP
ATE_PAD
Z4A
TL072 SM
4
5
6
R188
SW2B
2PCO
8K2 SM1%
10U NP
Q26
BC849B
C77
47N PE
2
3
Q_16
R179
R163
100R SM
Q_25
QPAD
Q54
BC859B
C49
1N0 PP
Q_61 Q_62
R195
22R SM
QPAD
470K SM
Q_26
QPAD
Q_17
QPAD
R178
470K SM
Q28
BC849B
R167
Q55
BC859B
R66
47R SM
Q_20
QPAD
Q_44
2K2 SM
D34
Q_52
Q27
BC849B
R162
R196
R122
100R SM
Q_24
QPAD
BAS16W SM
Q25
BC849B
22R SM
33K SM
Q_18
QPAD
C100
Q_63
R165
560R SM1%
10P SM#A
R77
Q51
BC856B
C107
100P PPS SM
C70X
56P PS
R171
22K MF
R63
1
3 4
O3 TLP181 SM
Q11
BC846B
Q_21
QPAD
100R SM
Q_51
+15V
R76
100R SM
C108
100P PPS SM
R174
10R SM
R117
10K SM
Q_45
R169
1K8 SM
C105
100N SM
Q10
BC846B
C36
R114
Q_23
QPAD
Q29
BC849B
2K4 SM
4N7 PP
47R SM
6
R78
-15V
Q50
BC856B
!
Q_46
!
Q_22
QPAD
100R SM
R17
R18
470R FU
R159
R101
470R FU
Q36
2SA1085
Q44
2SC2547
C65
150P PP
1K5 SM
C35
150P PP
470R SM
R79
C62
R156
R157
!
R152
1K0 SM
!
R151
100P PP
2K2 SM
2K2 SM
Q3
2SC5248
1K0 FU
1K0 FU
!
! !
R145
R153
470R FU
Q6
2SA1964
HS13
TO220HS23TR
HS14
TO220HS23TR
!
R134
220R SM
100R FU
R143
220R FU
R146
220R FU
R133
R144
100R FU
!
D7
220R SM
+VI Protection
Q24
BC849B
10V 400MW
!
Q30
BC849B
R95
C53
R96
C54
HS11
TO247HS2.8DEGC/W
R56
10R FU
R135
220R SM
R136
220R SM
D8
10V 400MW
R14
R105
68K SM
220R FU
47R SM
+
220U EL
R106
68K SM
R54
100R FU
R15
220R FU
!
!
47R SM
-VI Protection
+
220U EL
Q16
IRFP360LC
R89
0R22 3W MO
HS12
Q15
IRFP360LC
R91
0R22 3W MO
R57
D41
R88
0R22 3W MO
C5
R107
120K SM
TO247HS2.8DEGC/W
R90
0R22 3W MO
IQ2
ATE_PAD
C78
Bootstrap
220R 2W CF
12V 3W SM
+
100U EL 100V
VI Cut-out
!
R55
10R FU
D22
1N4003F
47N PE
R16 1K0 FU
!
C60
STABLE2
ATE_PAD
R97
+
C24
100N PC
150R SM
R109
100U EL
D26
R113
5R6 2W CF#A
L2
R111
1R5 1W CF
1K2 SM
ABiasRef
BAS16W SM
Bias Level detector
2U2H LAC
R40
22K SM
Q35
2SC2547
6
5
C58
100N PC
OUTPUT2
ATE_PAD
Z8B
LM393A SM
C103
1N0 SM
VI Latch
VI Cut
ABSUP
7
R69
R241
10K SM
Q_42
QPAD
100R SM
+SUP
Output
87654321
C59
100N PC
Q43
2SC2547
-SUP
R121
D
C
B
33K SM
ISERVO2
ATE_PAD
A
7
Auto-Bias Servo
1 2 3 4 5 6 7 8
Z4B
TL072 SM
C80
10U NP
R123
D33
33K SM
BAS16W SM
DRAWING TITLE
Alpha 10 Amp R Ch.
23425
!
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
Notes:
Filename
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\l829ct4_6.SCH
Circuit Diagram
97_1085
97_1086
SJB
SJB R54 chage from 10R to 100R
SJB R64 & 169 changed. C100 added.11-11-9797_1102
SJB PCB Issue 2 to 3 changes9-7-9898_1042
ECO No. DESCRIPTION OF CHANGE
Date Printed
INITIALS
10-Jul-1998
22-9-97
26-9-97
22-10-9797_1096
DATE
Hardware Remote RX 2SJB
C66 change from 220P to 330P
Drawn by:
SJB
3 5Sheet of
DRAWING NO.
A
3
4
5
6
ISSUE
L829CT4
BSRef
5
6
R64
2M2 SM
Page 17
87654321
Replace with same
D
Fit Jumper to PL1 for
test power-up from
external d.c. supply
R218
120K SM
PL1
C
2WVERTJUMPER
RVProt
LVProt
Lout
R44
VFault
R186
B
120K SM
+
C27
A
!
type component only
1 2 3 4 5 6 7 8
1
2
-SUP
47K SM
100U EL
Pwrok
R31
27K SM
R185
27K SM
C26
R45
Rout
47K SM
2
3
+
IN1
IN2
100U EL
R235
1
Z5
TA7317P
5
PRTSUP1
100K SM
PWR
V-
R124
-SUP
Power-off Auto-Bias defeat
R127
8
4
33K SM
D43
33K SM
R32
+
RC
0V
R125
5V6 400MW
R126
100K SM
100U EL
C25
9
V+
O
FB
7
33K SM
C16
33K SM
C50
1U0 EL
ABSUP1
+
10U EL
D23
Q45
2SC2547
6
+
Fault
RLY2B
1N4003F
RLY SPST SPKR
RLY1B
Speakers 1
R43
Z8C
LM393A SM
-SUP
RLY SPST SPKR
Prot
ACDet
47K SM
Speaker/Amp Protection
Fault
Q38
2SA1085
R205
6K8 1W CF
Auto-Bias supply
ABSUP
84
LED PCB
R
STBY/POWER
RLY6B
R200
D25
RLY4B
1N4003F
RLY SPDT 24V
RLY3B
2K7 1W CF
RLY SPST SPKR
D26N
RLY SPST SPKR
D24
1N4003F
Speakers 2
Soft Start
Q47
2SC2547
Q46
2SC2547
D35
BAS16W SM
R70
10K SM
R19
1K0 FU
D27
1N4003F
D36
BAS16W SM
!
Mains/VI Fault detection
+
R219
10K SM
C15
10U EL
R46
47K SM
R204
10K SM
Designators ending in...
N - For integrated amp only,
P - For power amp only,
R - For power amp with remote only,
S - For power amp with no remote
only,
X - Other end of wire link.
LK9X
4
3
2
1
L836CA
LED1P
LED RED/GRN
G
+SUP
1N4003F
RLY5NC
R201N
D38
BAS16W SM
RLY 51SB12T
2K7 1W CF
C11
Pre-Amp Out
!
R20
1K0 FU
D9
10V 400MW
Q56
BC859B
THTESTR
ATE_PAD
Q_28
RF Protection
Lout Rout
R147
470R SM
Q_14
C81
22P SM
Q_53
D20
BAS16W SM
R100
4K7 SM
D30
R190
1M0 SM
+
1U0 EL
D37
R21
BAS16W SM
R206
100K SM
Q_64
R34
11K SM
R233
10K SM
R189
22K SM
R192
1K0 FU
R203
2K4 SM
Q_33
Q34
BC849B
470K SM
R207
100K SM
Q_9
1
2
3
Thermal Protection
DRAWING TITLE
Alpha 10 Amp Power Ctrl
23425
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
D28
BAS16W SM
BAS16W SM
!
Q58
BC859B
D29
4V7 400MW
Z11
VREF
VCC
Vt2
OUT1
Vt1
OUT2
GND4Vtemp
LM56CIM
R173
470R SM
Q_27
C82
22P SM
Q_54
R142
4K7 SM
D40
+5V
C34
PREMTN1
C17
100N SM
+5V +5V
8
7
6
5
Q_1 Q_15
RemMute
BAS16W SM
+
10U EL
RFProt
Therm
PreMuteN
THTESTL
ATE_PAD
R234
Q_32
Cutout
SP2MuteN
SP1MuteN
ProtStat
SP1SW1
SW3A
2PCO
C3 100N SM
SW3B
2PCO
SP 1 SP 2 STANDBY
R33
12K SM
1
10K SM
2
3
R191
22K SM
n.b. R33 & R34 are supposed to be different!
REMOTE
L829CT5_6.SCH
PWR Amp Control
Z9
1
PB5
2
PB4
3
PA3
4
PA2
5
PA1
6
PA0
7
PB3
8
PB2
9
PB1
10
PB0
11
VSS
12
(TMR)/INT
13
PC0
14
PC1
3
2
1
6
5
4
Q_31
Z10
VREF
VCC
Vt2
OUT1
Vt1
OUT2
GND4Vtemp
LM56CIM
Break
Raw
Demod
3
2
1
6
5
4
Circuit Diagram
Notes:
Filename
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\l829ct2_6.SCH
Send
X1
CST4.00
PB6
PB7
PA4
PA5
PA6
PA7
OSC2
OSC1
VDD
RES
PC5
PC4
PC3
PC2
SP2SW1
STBYSW1
Powerup
28
27
26
25
24
23
22
21
20
19
18
17
16
15
3
2
1
SW5A
6
5
SW5B
4
Powerup
HT48R30 28-DIP-B-0
SW4A
2PCO
SW4B
2PCO
8
7
6
5
97_1086
ECO No. DESCRIPTION OF CHANGE
Date Printed
Power Supply Detection
Pwrok
RESET
5
6WP7
SCL
VSS
SDA
3
22-9-9797_1085
26-9-97
22-10-9797_1096
VDD
A01A12A2
Z12
24C02 SM
FAN
Q59
BC849B
Hardware Remote RX
No Change
4
2PCO
2PCO
+5V
R116
10K SM
SJB
SJB No Change
SJB No Change11-11-9797_1102
SJB PCB Issue 2 to 3 changes9-7-9898_1042
INITIALS
10-Jul-1998
DATE
Drawn by:
SJB
8
D48
C84
100N SM
Powerup
4V7 400MW
+UREG
R214
+5V
R175
4K7 SM
R215
R65
220R SM
4K7 SM
4K7 SM
4 5Sheet of
SK6
FFC22V
+5V
Q58R
BC859B
+SUP
R98
27K SM
Option PCB
Display PCB
SK9N
+PRE
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
LK9P
4
3
2
1
L836CA
3
2
1
R225R
1K0 SM
-PRE
8
Rmin
9
RemOut
10
11
SP2MuteN
12
SP1MuteN
13
Prot
14
15
16
ThermX_RST
17
SP3_PWR
18
VFault
19
STBYLED
20
REQ
21
SDA
22
SCK
FFC22V
LK10R
L815CA
ATE IR RX Disable pad
REMKILL1
User IR RX Disable Link
DRAWING NO.
Fault
+8V
R218P
LED PCB
Remote PCB
Rmin
L829CT2
FAULT1
REMI1
REMO1
SP2
SP1
PROT1
THERMX1
SP3_PWR
VFAULT1
STBYLED1
REQ1
SDA1
SCK1
220R SM
2SJB
3
4
5
6
ISSUE
D
C
B
A
Page 18
4321
220P SM
R28
10K SM
Q57
BC859B
Q_2
R211
4K7 SM
C98
Q_67
+5V
R83
R221
470R 1W CF
Send
O1
6
TLP181 SM
100R SM
Q_66
1
34
Q62 BC849B
REMJK2
47R SM
R213
REMJK1
Q_65
Q_68
REMJKO1
Q_39
Remote Buffer
Q61
BC849B
R210
R198
RemRaw
R80
1K5 SM
4K7 SM
Q31
BC849B
10K SM
D
+UREG
+5V
R223
R239
R237
10K SM
1K8 SM
1K5 SM
Carrier Filter
C91
680P PP
C92
27MH
L3
10N SM
+5V
R225
10K SM
Q_35 Q_36
C
R222
100K SM
Q_34
Z13A
2
1
3
LM393A SM
R227
10R FU
R220
100K SM
!
Break
Raw
C83
+
100U EL
Q_40
Remote In
Far from PCB
JACK3.5X2
Q37
BC849B
R209
4K7 SM
Near to PCB
Remote Out
SK10B
SK10AJACK3.5X2
D
C
Carrier Demodulator
Q_37
R226
10K SM
B
C93
1N0 SM
A
Q_38
R238
1K8 SM
Z13B
5
6
LM393A SM
Z13C
LM393A SM
R236
10K SM
7
Demod
84
DRAWING TITLE
Alpha 10 Amp Remote Bus
23425
Notes:
Demod
+5V
+5V
C97
100N SM
Circuit Diagram
R212
1K5 SM
97_1086
22-9-9797_1085
SJB
SJB R210, R198, R212 change
26-9-97
22-10-9797_1096
Hardware Remote RX
No Change
SJB No Change11-11-9797_1102
B
2SJB
3
4
A
5
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
1 2 3 4
Filename
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\L829CT5_6.SCH
ECO No. DESCRIPTION OF CHANGE
Date Printed
SJB PCB Issue 2 to 3 changes9-7-9898_1042
INITIALS
10-Jul-1998
DATE
Drawn by:
SJB
5 5Sheet of
DRAWING NO.
L829CT5
6
ISSUE
Page 19
P1
THRU_PINP2THRU_PINP3THRU_PINP4THRU_PIN
P5
THRU_PINP6THRU_PINP7THRU_PINP8THRU_PIN
P9
THRU_PIN
D
SK1
C
FFC22H
B
A
P10
THRU_PIN
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
ROW1
D5
1N4148
GND
D6
1N4148
GND
D7
1N4148
GND
D8
1N4148
GND
D9
1N4148
GND
D10
1N4148
GND
D11
1N4148
GND
1 2 3 4 5 6 7 8
RST
REQ
SDA
SCL
P11
THRU_PIN
RIN
ROUT
+8V
PWRLED
STBYLED
LED1
LED GREEN
LED2
LED GREEN
LED3
LED GREEN
LED4
LED GREEN
LED5
LED GREEN
LED6
LED GREEN
LED7
LED GREEN
P12
THRU_PIN
TO PREAMPTO POWER AMP
SK2
FFC22H
SW1
TACTSW2
SW2
TACTSW2
SW3
TACTSW2
SW4
TACTSW2
SW5
TACTSW2
SW6
TACTSW2
P13
THRU_PIN
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
R2
150R MF
R3
150R MF
R4
150R MF
R5
150R MF
R6
150R MF
R7
150R MF
SW7
TACTSW2
R8
150R MF
SOURCE_0
SOURCE_1
SOURCE_2
TAPE2_0
TAPE2_1
TAPE2_2
TAPE1_0
TAPE1_1
TAPE1_2
DATA
LOAD
CLOCK
+5V
R20
100K MF
COL1
COL2
COL3
COL4
COL5
COL6
COL7
C8
100N CD
+8V
SW8
TACTSW2
SW9
TACTSW2
SW10
TACTSW2
SW11
TACTSW2
+5V
3
+5V
GND Case
1
R1
3R3R FU
ROW1 ROW2
R15
4K7 MF
D1
1N4148
D2
1N4148
D3
1N4148
D4
1N4148
2
O/P
RX1
SBX1610-52
FOLD Z1 FLAT TO BOARD
+8V
C1
100N CD
R16
4K7 MF
PCB SILK SCREEN).
I
Vin
GND
+5V
1
RP1
100K X 8 COM
Z1
7805
ROW2
G
GND
2
3
4
5
6
7
8
9
Vout
TAPE1_0
TAPE1_1
TAPE1_2
TAPE2_0
TAPE2_1
O
NEAR Z1, Z2
R22
100K MF
RST
COL3
COL2
COL7
COL6
COL5
COL4
TAPE1_0
TAPE1_1
TAPE1_2
TAPE2_0
TAPE2_1
+5V
+5V
+
470U EL 25V
ZVNL120
X1
CST4.00
RIN
C2
Q2
TAPE2_2
SOURCE_0
SOURCE_1
SOURCE_2
LK1001
LK1
CUT LK1 TO DISABLE IR RECEIVER
10MM LINK
1 2
COL4
COL5
COL6
COL7
COL2
COL3
VFD_D3
VFD_D2
Q1
BC557B
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
R9
4K7 MF
Z2
MCLR
RA0
RA1
RA2
RA3
RA4/T0CKI
RA5/SS
RE0/RD
RE1/WR
RE2/CS
VDD
VSS
OSC1/CLKIN
OSC2/CLKOUT
RC0/T1OSI/T1CKI
RC1/T1OSO
RC2/CCP1
RC3/SCK/SCL
RD0/PSP0
RD1/PSP1
PIC16C65
** SOCKETED **
R10
4K7 MF
M1
ITRON_VFDM
GND1VCC2NC3RS4R/W (WR)5E (RD)6DB07DB18DB29DB310DB411DB512DB613DB7
+
C6
C3
R17
10K MF
R19
100R MF
REQ
220U EL
+5V
R18
100R MF
C4
100N CD
VFD_D1
VFD_D0
VFD_E
VFD_RS
COL1
100N CD
C5
100N CD
SCL SDA
TAPE2_2
SOURCE_0
SOURCE_1
SOURCE_2
14
VFD_E
VFD_RS
LINK10NP
LK1002
LINK10NP
LK1003
LINK10NP
LK1004
LINK10NP
LK1005
LINK10NP
LK1006
LINK10NP
VFD_D3
VFD_D2
VFD_D1
VFD_D0
RD7/PSP7
RD6/PSP6
RD5/PSP5
RD4/PSP4
RC4/SDI/SDA
RD3/PSP3
RD2/PSP2
RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0/INT
VDD
VSS
RC7
RC6
RC5/SDO
LK1007
LINK10NP
LK1008
LINK10NP
LK1009
LINK10NP
LK1010
LINK10NP
LK1011
LINK10NP
LK1012
LINK10NP
Itron VFD Module
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
LK1013
LINK10NP
LK1014
LINK10NP
LK1015
LINK10NP
LK1016
LINK10NP
LK1017
LINK10NP
LK1018
LINK10NP
LK1019
LINK10NP
LK1020
LINK10NP
LK1021
LINK10NP
LK1022
LINK10NP
PHASE_B
PHASE_A
ROW1
ROW2
SOURCE_0
SOURCE_1
SOURCE_2
ROUT
TAPE2_0
TAPE2_1
TAPE2_2
TAPE1_0
TAPE1_1
TAPE1_2
DATA
LOAD
CLOCK
R21
100R MF
DRAWING TITLE
23425
ALPHA 10 AMP DISPLAY
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
Circuit Diagram
1 1Sheet of
Filename
J:\PROJECTS\A10amp\CIRCS\display\L831ct_1.sch
2-Oct-1998
PHIL 15/5/97
DRAWN BY CHK BY
ECO No.
SCL
SDA
R_IN
R_OUT
L831PB
L831PB
PWRLED
DATE
PCB
SK3
ALPS_ENCODER
C
3
R13
150R MF
330R MF
STBYLED
SCL
STBYLED
SDA
RIN
CLOCK
ROUT
EL1
BARCODE LABEL
BARCODE_A10_DISP
+5V
R11
10K MF
B2A
1
PD11
PD12
TOOLING
PD101
TOOLING
LK3
3
2
1
PD13
TOOLING
L815CA
LK2
L815CA
REQ
LOAD
DATA
R14
TOOLING
PD100
TOOLING
REQ
STBYLED
LOAD
DATA
CLOCK
DESCRIPTION OF CHANGE
DD
Drilling Detail
Issue Box
DD_ISSUESML
R12
10K MF
PHASE_A
PHASE_B
PD14
TOOLING
3
2
1
87654321
UDB
Update Box
(Small)
UPDATE_SML
DD2
Drilling
Detail
DRILL_DETAIL
PD10
TOOLING
PD1
PD2
TOOLING
TOOLING
PD3
PD4
TOOLING
TOOLING
PD5
PD6
TOOLING
TOOLING
PD7
PD8
TOOLING
TOOLING
PD9
TOOLING
LED100
LED RED/GRN
L831CT 1
DRAWING NO.
D
C
G
R
B
A
ISSUE
Page 20
87654321
Z8
C15
SK1A
CDL
1
F
EMC
C33
D
N
1N0 SM
PHONO4G
CDR
47P SM
R19
R46
R47
R20
C16
1K0 SM
22K SM
22K SM
1K0 SM
CDL
CDR
Tape1_0
Tape1_1
Tape1_2
47P SM
C17
SK1B
F
N
PHONO4G
TUNERL
TUNERR
47P SM
R21
R48
R49
R22
C18
1K0 SM
22K SM
22K SM
1K0 SM
47P SM
C19
SK2A
C
C34
F
EMC
N
1N0 SM
PHONO4G
SK2B
AVL
1
AVR
AUX2L
F
N
AUX2R
PHONO4G
B
SK3A
TAPE1IL
1
F
EMC
C35
N
1N0 SM
PHONO4G
SK4A
TAPE1IR
TAPE2IL
1
F
EMC
C36
A
N
1N0 SM
PHONO4G
PL6
15 16
13 14
11 12
9 10
7 8
5 6
3 4
1 2
DIL16 VPLG
TAPE2IR
LK1X
8
7
6
5
4
3
2
1
L823CA
Phono PCB
47P SM
R23
R50
R51
R24
C20
47P SM
C21
47P SM
R25
R52
R53
R26
C22
47P SM
C23
47P SM
R27
R54
R55
R28
C24
47P SM
C25
47P SM
R29
R56
R57
R30
PH15P
PHGND1
PHOR
PHGND2
PHGND3
PHOL
PHGND4
PH15N
1K0 SM
22K SM
22K SM
1K0 SM
1K0 SM
22K SM
22K SM
1K0 SM
1K0 SM
22K SM
22K SM
1K0 SM
1K0 SM
22K SM
22K SM
1K0 SM
C26
47P SM
TunerL
TunerR
AVL
AVR
Aux2L
Aux2R
Tape1IL
Tape1IR
Tape2IL
Tape2IR
C37
Tape1_0
Tape1_1
Tape1_2
Tape2_0
Tape2_1
Tape2_2
Tape2_0
Tape2_1
Tape2_2
LK1
L823CA
EMC
1N0 SM
PHONO2G
13
Aux1L
CDL
TunerL
AVL
Aux2L
Tape2IL
PlugL
Aux1R
CDR
TunerR
AVR
Aux2R
Tape2IR
PlugR
Aux1L
CDL
TunerL
AVL
Aux2L
Tape1IL
PlugL
Aux1R
CDR
TunerR
AVR
Aux2R
Tape1IR
PlugR
X0
14
X1
15
X2
12
X3
1
X4
5
X5
2
X6
4
X7
6
INH
11
A
10
B
9
C
8
GND
7
VEE
MAX4051 SM
-7V2
Z9
13
X0
14
X1
15
X2
12
X3
1
X4
5
X5
2
X6
4
X7
6
INH
11
A
10
B
9
C
8
GND
7
VEE
MAX4051 SM
-7V2
Z10
13
X0
14
X1
15
X2
12
X3
1
X4
5
X5
2
X6
4
X7
6
INH
11
A
10
B
9
C
8
GND
7
VEE
MAX4051 SM
-7V2
Z11
13
X0
14
X1
15
X2
12
X3
1
X4
5
X5
2
X6
4
X7
6
INH
11
A
10
B
9
C
8
GND
7
VEE
MAX4051 SM
-7V2 -7V2
+15V
1
2
R
3
Aux1R
4
5
L
6
Aux1L
7
8
-15V
SK5
AUX1L
1
AUX1R
VDD
VDD
VDD
VDD
+6V8
X
+6V8
X
+6V8
X
+6V8
X
S.J.B.
C13
47P SM
R17
R44
R45
R18
C14
47P SM
16
3
16
3
16
3
16
3
R38
R39
R40
R41
1K0 SM
22K SM
22K SM
1K0 SM
100K SM
100K SM
100K SM
R80
100K SM
R81
FD_1
FIDUCIAL
Q_18
QPAD
Q_19
QPAD
Q_20
QPAD
Q_21
QPAD
22K SM
22K SM
R14
Aux1L
Aux1R
3
2
5
6
3
2
5
6
Aux1L
CDL
TunerL
AVL
Aux2L
Tape1IL
Tape2IL
PlugL
Source_0
Source_1
Source_2
SETOFF
-7V2
Aux1R
CDR
TunerR
AVR
Aux2R
Tape1IR
Tape2IR
PlugR
Source_0
Source_1
Source_2
10K SM
FD_2
FIDUCIAL
TL1
TOOLING
TL3
TOOLING
TL5
TOOLING_BIG
Z12A
TL072 SM
Z12B
TL072 SM
Z13A
TL072 SM
Z13B
TL072 SM
Z6
MAX4051 SM
13
X0
14
X1
15
X2
12
X3
1
X4
5
X5
2
X6
4
X7
6
INH
11
A
10
B
9
C
8
GND
7
VEE
Z7
13
X0
14
X1
15
X2
12
X3
1
X4
5
X5
2
X6
4
X7
6
INH
11
A
10
B
9
C
8
GND
7
VEE
MAX4051 SM
TL2
TOOLING
TL4
TOOLING
TL6
TOOLING_BIG
1
7
1
7
VDD
VDD
R58
47R SM
Q_1
QPAD
R59
47R SM
Q_2
QPAD
R60
47R SM
Q_3
QPAD
R61
47R SM
Q_4
+15V +15V
QPAD
Z12C
TL072 SM
-15V -15V
+6V8
16
3
Null_L
X
R6
100K SM
+6V8
16
OPA2134PA SM
3
Null_R
X
R7
100K SM
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
TAPE1OL
TAPE1OR
TAPE2OL
TAPE2OR
84
Z13C
TL072 SM
Z4A
3
2
OPA2134PA SM
-7V2
Z4B
5
6
Q_11QPAD
Q_10QPAD
Q_9QPAD
Q_14QPAD
Q_13QPAD
Q_12QPAD
Q_17QPAD
Q_16QPAD
Q_15QPAD
23425
SK3B
F
N
PHONO4G
SK4B
F
N
PHONO4G
84
R64
1
Z14
C1
10U NP
1
GND AC
2
OUT1
3
GND1
4
IN1
5
GND AC
6
GND AC
7
VEE2
8
LOGIC GND
9
CLOCK
LOAD/SHIFT10DATA IN
LM1972
C3
7
10U NP
C38
Clock
Load
Data
LGND
1N0 SM
Tape1_2
Tape1_1
Tape1_0
Tape2_2
Tape2_1
Tape2_0
Source_2
Source_1
Source_0
R75
100K SM
R73
100K SM
R71
100K SM
R69
100K SM
DRAWING TITLE
A10 Amp Pre-Amp PCB
Circuit Diagram
1 1Sheet of
Filename
J:\PROJECTS\A10amp\CIRCS\PREAMP\L832ct_1.sch
Z3A
3
2
OPA2134PA SM
R66
6K8 SM1%
1K5 SM1%
GND AC
GND AC
DATA OUT
R33
1K0 SM
R77
100R SM
R31
1K0 SM
R76
R74
R72
R70
R68
2-Oct-1998
R62
1
47R SM
20
IN2
19
GND2
18
VEE1
17
OUT2
16
15
VDD2
14
13
VDD1
12
11
R34
1K0 SM
R32
1K0 SM
100K SM
100K SM
100K SM
100K SM
100K SM
DRAWN BY CHK BY
SK7
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
FFC22V
+6V8
R65
R5
1K8 SM
Z3B
5
6
OPA2134PA SM
R67
6K8 SM1%
1K5 SM1%
-7V2
CLOCK
LOAD
DATA
DGND
SOURCE_2
SOURCE_1
SOURCE_0
TAPE2_2
TAPE2_1
TAPE2_0
TAPE1_2
TAPE1_1
TAPE1_0
7
SK8
FFC32V
ECO No.
R63
47R SM
+6V8
C10
C11
-7V2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
ROUT
PASW1
LOUT
680P PP
680P PP
Aux1L
Aux1R
CDL
CDR
TunerL
TunerR
AVL
AVR
Aux2L
Aux2R
Tape1IL
Tape1IR
Tape2IL
Tape2IR
PlugL
PlugR
DATE
+6V8
+
C2
22U EL
+
C4
22U EL
-7V2
To Plug-in PCB
PLUGINL
PLUGINR
+15V
84
84
Z3C
-15V
+15V
Pre-Amp Audio Output
+
R1
1K0 SM
R3
56R SM
D1
6V8 400MW
+15V
Z4C
OPA2134PA SM
-15V
PAN1
C31
22U EL
1N0 SM
D2
6V8 400MW
R4
56R SM
NASW1
R2
C32
22U EL
+
C9
1N0 SM
1K0 SM
Drilling
Detail
BARCODE LABEL
DD1
PCB
L832PB
Drilling Detail
Issue Box
DD_ISSUE
DESCRIPTION OF CHANGE
LK2
C8
L832CA
NAN1
-15V
OPA2134PA SM
+15V
1
2
3
4
5
6
7
8
Update Box
Photo Strip
L832CT 1
DRAWING NO.
D
GND
C
B
A
ISSUE
1 2 3 4 5 6 7 8
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