Arcam Alpha 10P User manual

H ALALPHA 10/10P SERVICE MANUAL
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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 low-
impedance 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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Figure 1Block Diagram of Power Amplifier
Sense Resistor
Comparitor Output
Measured Current (blue)
Other MOSFET
-ve MOSFET
50% 49% 52%
Bias correct Under Biassed Over Biassed
Figure 2 Auto-bias under dynamic conditions
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

H ALALPHA 10/10P SERVICE MANUAL
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Figure 3 Micro Block Diagram
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.

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•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 RECT FIER 6A40 6A 400V 3B6A40
D11 RECT FIER 6A40 6A 400V 3B6A40
D12 RECT FIER 6A40 6A 400V 3B6A40
D13 RECT FIER 6A40 6A 400V 3B6A40
D14 RECT FIER 1N4003F 1A 200V 3B4003
D15 RECT FIER 1N4003F 1A 200V 3B4003
D16 SSDIODE 1N4148 75V 3A4148
D17 SSDIODE 1N4148 75V 3A4148
D18 RECT FIER 1N4003F 1A 200V 3B4003
D19 RECT FIER 1N4003F 1A 200V 3B4003
D20 SSDIODE 1N4148 75V 3A4148
D21 RECT FIER 1N4003F 1A 200V 3B4003
D22 RECT FIER 1N4003F 1A 200V 3B4003
D23 RECT FIER 1N4003F 1A 200V 3B4003
D24 RECT FIER 1N4003F 1A 200V 3B4003
D25 RECT FIER 1N4003F 1A 200V 3B4003
D26 SSDIODE 1N4148 75V 3A4148
D27 RECT FIER 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 RECT FIER 1N4003F 1A 200V 3B4003
D46 SSDIODE 1N4148 75V 3A4148
D47 SSDIODE 1N4148 75V 3A4148

H ALALPHA 10/10P SERVICE MANUAL
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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 CL P 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 CL P 2DEGC/W E803HK E803HK
HS10 HEATSINK TO220 CLIP 23DEG/W F004
HS11 HEATSINK TO247 CL P 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 CL P 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 NDUCTOR 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

H ALALPHA 10/10P SERVICE MANUAL
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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

H ALALPHA 10/10P SERVICE MANUAL
8
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

H ALALPHA 10/10P SERVICE MANUAL
9
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

H ALALPHA 10/10P SERVICE MANUAL
10
RLY6 RELAY MA NS 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 BIND NG POST 4WAY GOLD 8D417G
SK3 CAMCON BIND NG POST 4WAY GOLD 8D417G
SK4 IEC MA NS CONN PCB NS 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 C RCUIT BOARD L832PB
PL6 16 WAY DIL P N HEADER 8K6316
R1 RESISTOR SM W4 1K0 2% 1A210
R2 RESISTOR SM W4 1K0 2% 1A210
R3 RESISTOR SM W4 56R 2% 1A056

H ALALPHA 10/10P SERVICE MANUAL
11
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

H ALALPHA 10/10P SERVICE MANUAL
12
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 C RCUIT 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 PLA N 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-P N LOW PROF A1504
SW2 TACT SWITCH 2-P N LOW PROF A1504
SW3 TACT SWITCH 2-P N LOW PROF A1504
SW4 TACT SWITCH 2-P N LOW PROF A1504
SW5 TACT SWITCH 2-P N LOW PROF A1504
SW6 TACT SWITCH 2-P N LOW PROF A1504
SW7 TACT SWITCH 2-P N LOW PROF A1504
SW8 TACT SWITCH 2-P N LOW PROF A1504
SW9 TACT SWITCH 2-P N LOW PROF A1504
SW10 TACT SWITCH 2-P N LOW PROF A1504
SW11 TACT SWITCH 2-P N 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

12345678
A
B
C
D
87654321
D
C
B
A
ISSUE
DRAWING NO.
23425
DRAWING TITLE
Drawn by:
DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\L829ct1_6.prj
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
Alpha 10 Amp Main
Circuit Diagram
L829CT1
SJB
10-Jul-1998
INITIALS
Date Printed 1 5Sheet of
Notes:
D1
15V 400MW
R1 1R0 FU R7 470R FU
D3
10V 400MW
+
C1
100U EL 100V
Vin
I
ADJ
A
Vout O
Z1
LM317T
R22
220R SM1%
R24
2K4 SM1%
+
C6
22U EL
+15V
+
C7
10U EL
+15V Regulator
D2
15V 400MW
R2 1R0 FU R8 470R FU
D4
10V 400MW
+
C2
100U EL 100V
R23
220R SM1%
R25
2K4 SM1%
+
C8
22U EL
+
C9
10U EL
Vin
I
ADJ A
Vout O
Z2
LM337T
-15V Regulator
-15V
D14 1N4003F
D15 1N4003F
-SUP
+SUP
C20
4N7 PP
C21
4N7 PP
PAN1
ATE_PAD
NAN1
ATE_PAD
PPRE1
ATE_PAD
NPRE1
ATE_PAD
NSUP1
ATE_PAD
PSUP1
ATE_PAD
PGND1
ATE_PAD
HS
HS1A
TO220HS13REG
HS3A
TO220HS23REG
Q1
2SC5248
Q4
2SA1964
HS6N
TO220HS23TR
R3 1R0 FU
RLY1A
RLY SPST SPKR
RLY2A
RLY SPST SPKR
RLY5NA
RLY 51SB12T
RLY5NB
RLY 51SB12T
Output
VI Latch VI Cut
ABiasRef
Input
PWRAMPL
l829ct3_6 SCH
Output
VI Latch VI Cut
ABiasRef
Input
PWRAMPR
l829ct4_6 SCH
R26
22K SM
R36 47K SM
+
C22
10U EL
RLY3A
RLY SPST SPKR
RLY4A
RLY SPST SPKR
R47
68K SM
R48
180R SM
ABSUP
-SUP
VI Cut-out latch
VIRESET1
ATE_PAD
SGND1
ATE_PAD
EMC
1
N
F
SK1A
PHONO4G
N
F
SK1B
PHONO4G
L&R Inputs
R27 22K SM
LOut
ROut
84
Z3C
TL072 SM
84
Z4C
TL072 SM
+15V
C38
680P PP
C39
680P PP
1 2 3
SW1NA
2PCO_VERT
4 5 6
SW1NB
2PCO_VERT
Pre_Outputs Top+
Top-
SK2A
CAMCON_G
Bot+
Bot-
SK2B
CAMCON_G
CHASS
SK2C
CAMCON_G
Top+
Top-
SK3A
CAMCON_G
Bot+
Bot-
SK3B
CAMCON_G
CHASS
SK3C
CAMCON_G
C29
470P SM
C30
470P SM
C40
10N SM
C41
10N SM
C42
10N SM
C43
10N SM
SPKB1
ATE_PAD
SPKA1
ATE_PAD
SPKB2
ATE_PAD
SPKA2
ATE_PAD
PRE1
ATE_PAD
PRE2
ATE_PAD
HS8N
TO220HS23TR
+PRE
-PRE
LVProt
RVProt
ACDet
Fault
Powerup
FAN
RESET
CONTROL
l829ct2_6 SCH
Vin
I
GND
G
Vout O
Z6
7805
C31
100N SM
+
C10
10U EL
+5V
Control Supply
L
N
E
N E L
SK4
EC3
C44
4N7 MAINS
RLY6A
RLY SPDT 24V D18
1N4003F
D19
1N4003F
+
C48
3M3 EL
C85
100N SM
Vin
I
GND
G
Vout O
Z7
7808
C86
100N SM
C46
4N7 MAINS
C47
4N7 MAINS
+
C45
10U EL
+8V
HS
HS2NA
TO220HS08REG
230V
115V
0V BLUE
GREEN
BLUE
BLACK
BROWN
ORANGE
GRN/YEL
TX1
L831TX
F4
AS2A5
F5
AS4A_115V
+8V
-15V
Fault
ACDet
ACDet
R71
4K7 SM
Q12
BC847B
+UREG
+UREG
EMC Shield
SH1
EMCMAINS
1
2
3
4
5
6
SKT1
JST 6W HEADER
ACDet
+SUP+15V
-15V
-SUP
3rd Ch. Power
Digital Supply
1
2
3
4
5
6
7
8
SK11
WTRAP2.5X8V
+15V
-15V
Pre-Amp Audio Input
Kit Masks:
1) For Integrated Amp use...
N, F inclusive
2) For Power Amp use...
P,S,F inclusive
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.
! !
!
!
!
BARCODE LABEL
BARCD
BARCODE
SJB
SJB
SJB
Update Box
UPDTBX
UPDATE_BOX
Photo Strip
PS
PHOTO_STR P
FD_1
FIDUCIAL
FD_2
FIDUCIAL
PD5
TOOLING
PD7
TOOLINGPD8 TOOLING
Replace with same
type component only
!
LHC 2
RHC 3
1
4
L5
6
R7
SK5
HPSKT
R4
330R 1W CF
R5
330R 1W CF
R6
100R W2 CF
R49
100R W2 CF
LOut
ROut
D16
BAS16W SM
Blue 1
Dark Grey 2
Orange 3
SK7
CAGECLAMP3
Grey 1
Light Green 2
Light Green 3
G ey 4
SK8
CAGECLAMP4
Y1
TX W RE CL P
HP1
HP2
R81
180R SM
R82
180R SM
UREG1
ATE_PAD PDIG1
ATE_PAD PMPU1
ATE_PAD
TH3
PTHMA NS
+
C32
22U EL
+
C33
22U EL
SCREENSCREENSCREENSCREEN
SW1NC
2PCO_VERT
Chassis Connection
FIX3
R228
2K7 1W CF
R229 2K7 1W CF
EMC Shield
SH2
EMCPHONO
AC1
ATE_PAD
AC2
ATE_PAD
TXGND
ATE_PAD
TXN
ATE_PAD
TX115
ATE_PAD
TX230
ATE_PAD
LIVE
ATE_PAD
NEUTRAL
ATE_PAD
D10
6A40
D11
6A40
D12
6A40
D13
6A40
230V
115V
12
2
5
70V
13
11
11V
0V
11V
TX2
L825TX
RLY7A
RLY DPDT 12V
RLY7B
RLY DPDT 12V
RLY7C
RLY DPDT 12V
C13
4N7 MA NS
R35P
0R0 SM
R65P
0R0 SM
R80P 0R0 SM
R83P 0R0 SM
Q42
BC847B
D44
24V 3W SM
D45
1N4003F
R35
1K0 SM
Q59F
2SC5248
Q39
BC849B
1
2
SKT3
MOLEX2MV
Fan
C89
100N SM
D46 BAS16W SM D47 BAS16W SM
R230 47K SM
C87
100N SM
LOut
ROut
+UREG
R231
47K SM
C88
100N SM
Fan R232
1K0 SM
Issue Box
Drilling Detail
DD1
DD_ISSUE
FIX1
FIX2
FIX4 FIX5 FIX6 FIX7
FANOUT
ATE_PAD
Green
1SK9
CAGECLAMP1
R29 1K5 SM
D115V ATE_PAD
D240V ATE_PAD
ACD1
ATE_PAD
ACD2
ATE_PAD
R199 1R0 FU
!
Q7
BC856B
Q60
BC859B
R208
470R SM
Fault
C94
10N SM
R128
22K SM
R201 22K SM
+
C95
10U EL
Y2
TX WIRE CLIP
+
C96
10U EL
R202
100K SM
D42
BAS16W SM
+
C90
10U EL
R217
10K SM
D50
5V6 400MW
D49
BAS16W SM
R216
1K0 SM
Reset Circuit
TH2 PTHMA NS
C28
470P SM
SJB
Hardware Remote RX
PCB
PCB
L829PB
C6 & C8 change from 10u to 22u
2SJB
26-9-97
22-9-9797_1085
97_1086
SJB No Change
3
22-10-9797_1096
SJB HS2N change to larger size11-11-9797_1102
4
C101
47N PE
5
6
+C18
10M EL 63V
+C19
10M EL 63V
Paper Marker
A2 Horizontal
DDH
DD_A2H
Paper Marker
A2 Vertical
DDV
DD_A2V
FR4, 2 OZ Cu
PCB MATERIAL
DDM
FR4_2OZ
FIX8 FIX9
Q_30 Q_47
Q_48
Detail
Drilling
DDD
DR LL_DWG
Q_55
Q_56
Q_57
R224
10R MF
1
2SKT2
MOLEX2MV
SJB PCB Issue 2 to 3 changes9-7-9898_1042

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DRAWING TITLE
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DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\l829ct3_6.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
Alpha 10 Amp L Ch.
Circuit Diagram
L829CT3
SJB
10-Jul-1998
INITIALS
Date Printed 2 5Sheet of
Notes:
Output
VI Latch
VI Cut
Q13
IRFP360LC
Q14
IRFP360LC
R50
100R FU
R84
0R22 3W MO
R85
0R22 3W MO
+
C51
220U EL
R92 47R SM
R9
220R FU
R86
0R22 3W MO
R87
0R22 3W MO
R93
47R SM
R10
220R FU
Q17
BC849B
R102
68K SM
R103
68K SM
+
C23
100U EL
R94
150R SM
R108
1K2 SM
R11 1K0 FU
R104
120K SM
R37
22K SM
L1 2U2H LAC
R110
1R5 1W CF
VI Cut-out
+VI Protection
-VI Protection
3
21
Z8A
LM393A SM
R51
10R FU
R112
5R6 2W CF#A
C55
100N PC
R52
10R FU
ABiasRef
Q40
2SC2547
R68 10K SM
R118 33K SM
D5
10V 400MW
R129
220R SM
R130
220R SM
Q2
2SC5248
R138
220R FU
R148
1K0 FU
R149
1K0 FU
C61 100P PP
R131
220R SM
R132
220R SM
D6
10V 400MW
Q5
2SA1964
R139 100R FU R140 100R FU R150 470R FU
R154 2K2 SM
R155
2K2 SM
Q41
2SC2547
Q33
2SA1085
C63
150P PP
R12 470R FU
R13 470R FU R158
1K5 SM
+SUP
-SUP
C56
100N PC
C57
100N PC
Q48
BC856B
Q49
BC856B
R160 100R SM
R72 100R SM
Q8
BC846B
Q9
BC846B
R73 100R SM R74 100R SM
Q18
BC849B
Q19
BC849B
Q52
BC859B
R161 100R SM
+15V
R164 560R SM1%
Q20
BC849B
Q21
BC849B
R166 2K2 SM
R119 33K SM
-15V
R172
10R SM
C69X
56P PS
3
2
1
Z3A
TL072 SM
R176
470K SM
R177 470K SM
C71
10U NP
R38 47K SM
C75
47N PE
R59 1M0 SM
C64 330P PP
R180 47K SM1%
R182
2K7 SM
C72
10U NP
Input
ABSUP
5
6
7
Z3B
TL072 SM
R30 120K SM
R184 100K SM
R61
2M2 SM
Bias Level detector
Auto-Bias Servo
Voltage Servo
OUTPUT1
ATE_PAD
INPUT1
ATE_PAD
VSERVO1 ATE_PAD
ISERVO1 ATE_PAD
STABLE1
ATE_PAD
Bootstrap
1
2
3
SW2A
2PCO
R187 8K2 SM1%
Gain 29dB or 28.3x
R141
220R FU
R75 1K0 SM
D31
BAS16W SM
R120 33K SM
D21
1N4003F
R193 22R SM R194 22R SM
Q53
BC859B
D32
BAS16W SM
HS7
TO220HS23TR
HS10
TO220HS23TR
HS5
TO247HS2 8DEGC/W
HS9
TO247HS2.8DEGC/W
Q_3
QPAD
Q_4
QPAD
Q_5
QPAD
Q_7
QPAD
Q_8
QPAD
Q_10
QPAD
Q_11
QPAD
Q_12
QPAD
Q_13
QPAD
Q_29
QPAD
!
!
!
!
!
!
!
!
!
!
!
!
Replace with same
type component only
!
R137
100K SM
D17
BAS16W SM
+
C4
100U EL 100V C76
47N PE
R53
220R 2W CF
D39
12V 3W SM
C79
10U NP
R170
22K MF
C14
150P PP
R99
470R SM
C37
1N0 PP
R58
47R SM
R67
47R SM
IQ1
ATE_PAD
C12
4N7 PP
+
C52
220U EL
Q32
2SC2547
Q23
BC849B
SJB
22-9-97
C64 change from 220P to 330P
Hardware Remote RX 2SJB
26-9-97
97_1085
97_1086
SJB R50 change from 10R to 100R
3
22-10-9797_1096
C99
10P SM#A
SJB R61 & 168 changed. C99 added.11-11-9797_1102
4
C102
1N0 SM
R240
100R SM
5
6
Q_41
QPAD
R39
4K7 SM
Q22
BC849B
1
3 4
6
O2 TLP181 SM
R60 1K8 SM
R115
10K SM
C104
100N SM
Q_6
Q_19
Q_43
R168 2K4 SM
C67
10N SM
BSRef
Q_49
Q_50
Q_58 Q_59
Q_60
C68
100P PPS SM C106 100P PPS SM
SJB PCB Issue 2 to 3 changes9-7-9898_1042

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Filename ECO No. DESCRIPTION OF CHANGE
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\l829ct4_6.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
Alpha 10 Amp R Ch.
Circuit Diagram
L829CT4
SJB
10-Jul-1998
INITIALS
Date Printed 3 5Sheet of
Notes:
Output
Q15
IRFP360LC
R54
100R FU
R90
0R22 3W MO
R91
0R22 3W MO
R96
47R SM
R15
220R FU
Q24
BC849B
R106
68K SM
L2 2U2H LAC
R111
1R5 1W CF
-VI Protection
5
67
Z8B
LM393A SM
R55
10R FU
R113
5R6 2W CF#A
C58
100N PC
ABiasRef Q43
2SC2547
R69 10K SM
R121 33K SM
D7
10V 400MW
R133
220R SM
R134
220R SM
Q3
2SC5248
R143
220R FU
R151
1K0 FU
R152
1K0 FU
C62 100P PP
Q6
2SA1964
R144 100R FU R145 100R FU R153 470R FU
R156 2K2 SM
R157
2K2 SM
Q44
2SC2547
Q36
2SA1085
C65
150P PP
R17 470R FU
R18 470R FU R159
1K5 SM
+SUP
-SUP
C59
100N PC
C60
100N PC
Q50
BC856B
Q51
BC856B
R162 100R SM
R76 100R SM
Q10
BC846B
Q11
BC846B
R77 100R SM R78 100R SM
Q25
BC849B
Q26
BC849B
Q54
BC859B
R163 100R SM
+15V
R165 560R SM1%
Q27
BC849B
Q28
BC849B
R167 2K2 SM
R122 33K SM
-15V
R174
10R SM
C70X
56P PS
3
2
1
Z4A
TL072 SM
R178
470K SM
R179
470K SM
C73
10U NP
R41 47K SM
C77
47N PE
R62 1M0 SM
C66 330P PP
R181 47K SM1%
R183
2K7 SM
C74
10U NP
Input
ABSUP
5
6
7
Z4B
TL072 SM
R64
2M2 SM
Bias Level detector
Auto-Bias Servo
Voltage Servo
OUTPUT2
ATE_PAD
INPUT2
ATE_PAD
VSERVO2 ATE_PAD
ISERVO2 ATE_PAD
STABLE2
ATE_PAD
+
C5
100U EL 100V
4
5
6
SW2B
2PCO
R188 8K2 SM1%
Gain 29dB or 28.3x
R146
220R FU
R79 1K0 SM
D33
BAS16W SM
R123 33K SM
D22
1N4003F
R195 22R SM R196 22R SM
Q55
BC859B
D34
BAS16W SM
HS13
TO220HS23TR
HS14
TO220HS23TR
HS12
TO247HS2.8DEGC/W
Q_16
QPAD
Q_17
QPAD
Q_18
QPAD
Q_20
QPAD
Q_21
QPAD Q_22 QPAD
Q_23
QPAD
Q_24
QPAD
Q_25
QPAD
Q_26
QPAD
!
!
!
!
!
!
!
!
! !
!
Replace with same
type component only
!
R197
100K SM
Bootstrap
!
D26
BAS16W SM
C78
47N PE
R57
220R 2W CF
D41
12V 3W SM
C35
150P PP
R101
470R SM
C80
10U NP
R171 22K MF
C49
1N0 PP
R66
47R SM
R114
47R SM
IQ2
ATE_PAD
C36
4N7 PP
+
C54
220U EL
VI Latch
VI Cut
+
C24
100U EL
R97
150R SM
R109
1K2 SM
R16 1K0 FU
R107
120K SM
R40
22K SM
VI Cut-out
!
Q35
2SC2547
Q16
IRFP360LC
R88
0R22 3W MO
R89
0R22 3W MO
+
C53
220U EL
R95 47R SM
R14
220R FU
R105
68K SM
+VI Protection
R56
10R FU
R135
220R SM
R136
220R SM
D8
10V 400MW
HS11
TO247HS2 8DEGC/W
!
Q30
BC849B
SJB
22-9-97
C66 change from 220P to 330P
Hardware Remote RX 2SJB
26-9-97
97_1085
97_1086
SJB R54 chage from 10R to 100R
3
22-10-9797_1096
C100
10P SM#A
SJB R64 & 169 changed. C100 added.11-11-9797_1102
4
R241
100R SM
C103
1N0 SM
5
6
Q_42
QPAD
R42
4K7 SM
Q29
BC849B
1
3 4
6
O3 TLP181 SM
R63 1K8 SM
R117
10K SM
C105
100N SM
Q_44
Q_45
Q_46
R169 2K4 SM
BSRef
Q_51
Q_52
Q_61 Q_62
Q_63
C107
100P PPS SM C108 100P PPS SM
SJB PCB Issue 2 to 3 changes9-7-9898_1042

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DRAWING TITLE
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DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\l829ct2_6.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
Alpha 10 Amp Power Ctrl
Circuit Diagram
L829CT2
SJB
10-Jul-1998
INITIALS
Date Printed 4 5Sheet of
Notes:
PWR 1
N1
2
N2
3
0V
4
V-
5
O6
FB
7
RC 8
V+ 9
Z5
TA7317P
R124 33K SM
R186 120K SM
R125 33K SM
+
C50
1U0 EL
R43 47K SM
+
C25 100U EL
R32 100K SM
+
C26 100U EL
+
C27 100U EL
R44 47K SM R45 47K SM
R126 33K SM R127 33K SM
+SUP
RLY1B
RLY SPST SPKR
RLY2B
RLY SPST SPKR
Speakers 1 Speakers 2
Speaker/Amp Protection
D23
1N4003F
D24
1N4003F
Q45
2SC2547
Q46
2SC2547
R200
2K7 1W CF
D35
BAS16W SM
D36
BAS16W SM
R19
1K0 FU
R20
1K0 FU
RLY5NC
RLY 51SB12T
D25
1N4003F
D26N
1N4003F
R201N
2K7 1W CF
Soft Start
Pre-Amp Out
Q47
2SC2547
D37
BAS16W SM
R21 1K0 FU
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
SK9N
FFC22V
-SUP
+
C15
10U EL
R46
47K SM
D38 BAS16W SM
Q56
BC859B R203
2K4 SM
Q38
2SA1085
R204
10K SM
R205
6K8 1W CF
D43
5V6 400MW
+
C16
10U EL
84
Z8C
LM393A SM
-SUP
ABSUP
Auto-Bias supply
Power-off Auto-Bias defeat
ABSUP1
RLY3B
RLY SPST SPKR
RLY4B RLY SPST SPKR
PRTSUP1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
SK6
FFC22V
D9
10V 400MW
D29
4V7 400MW
R206
100K SM
R207 100K SM
X1
CST4.00
C34
100N SM
+
C17
10U EL
LVProt
RVProt
R70
10K SM
D27
1N4003F
ACDet
Fault
+5V
1
2
3
SW3A 2PCO
4
5
6
SW3B 2PCO
1
2
3
SW4A 2PCO
4
5
6
SW4B 2PCO
1
2
3
SW5A 2PCO
4
5
6
SW5B 2PCO
SP 1 SP 2 STANDBY
Powerup
Fault
+PRE
-PRE
Rmin
RemOut REMI1
REMO1
Fault
SP2MuteN
SP1MuteN
PreMuteN
Prot
SP2MuteN
SP1MuteN
Prot
PREMTN1
SP3_PWR
SP1
PROT1
FAULT1
+8V
SCK1
SDA1
REQ1
STBYLED1
STBYLED
REQ
SDA
SCK
VFault
VFault
SP2
VFAULT1
SP3_PWR THERMX1
ThermX_RST
Option PCB Display PCB
+5V
Rmin
Remote PCB
PWR Amp Control
Thermal Protection
Mains/VI Fault detection
R218P 220R SM
Q58R
BC859B
R225R
1K0 SM REMK LL1
ATE IR RX Disable pad
User IR RX Disable Link
RLY6B
RLY SPDT 24V
1
2
3LK10R
L815CA
LED PCB
1
2
3
4LK9P
L836CA
1
2
3
4LK9X
L836CA
R G
LED1P
LED RED/GRN
STBY/POWER
!
LED PCB
!
Replace with same
type component only
!
!
C3 100N SM
SP1SW1
SP2SW1
STBYSW1
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.
PB5
1PB4
2PA3
3PA2
4PA1
5PA0
6PB3
7PB2
8PB1
9PB0
10 VSS
11 (TMR)/INT
12 PC0
13 PC1
14 PC2 15
PC3 16
PC4 17
PC5 18
RES 19
VDD 20
OSC1 21
OSC2 22
PA7 23
PA6 24
PA5 25
PA4 26
PB7 27
PB6 28
Z9
HT48R30 28-DIP-B-0
R235
100K SM
VREF
1Vt2
2Vt1
3GND
4Vtemp 5
OUT2 6
OUT1 7
VCC 8
Z11
LM56CIM
VREF
1Vt2
2Vt1
3GND
4Vtemp 5
OUT2 6
OUT1 7
VCC 8
Z10
LM56C M
R33
12K SM
R34
11K SM
R189
22K SM R191 22K SM
+5V +5V
R65
220R SM
Powerup
Powerup
Cutout
RFProt
Therm
ProtStat
RemMute
R234 10K SM R233 10K SM
FAN
Q_1 Q_15
THTESTR
ATE_PAD THTESTL ATE_PAD
Q58
BC859B
R116 10K SM
+5V
Q59
BC849B
Q_9
Q_28
Q_31
Q_32
+UREG
R147
470R SM
R173
470R SM
C81 22P SM
C82
22P SM
R100 4K7 SM R142 4K7 SM
D20 BAS16W SM D28 BAS16W SM
D30
BAS16W SM
D40
BAS16W SM
Lout Rout
Rout
Lout
RF Protection
R98
27K SM
R175
4K7 SM
D48
4V7 400MW
+SUP
Pwrok
Power Supply Detection
A0
1A1 2A2 3
VSS
4
SDA 5
SCL 6
WP 7
VDD 8
Z12
24C02 SM
+5V
R190
1M0 SM
R192
470K SM
+
C11
1U0 EL
Q34
BC849B
Q_14 Q_27
Q_33
C84
100N SM
R214 4K7 SM R215 4K7 SM
RESET
R218 120K SM
Fit Jumper to PL1 for
test power-up from
external d.c. supply
-SUP
R219
10K SM
Send
Break
Demod
Raw
REMOTE
L829CT5_6 SCH
5
SJB
Hardware Remote RX
n.b. R33 & R34 are supposed to be different!
No Change
2SJB
26-9-97
22-9-9797_1085
97_1086
SJB No Change
3
22-10-9797_1096
SJB No Change11-11-9797_1102
4
6
Q_53
Q_54
Q_64
R31 27K SM
R185 27K SM
Pwrok
1
2
PL1
2WVERTJUMPER
SJB PCB Issue 2 to 3 changes9-7-9898_1042

1 2 3 4
A
B
C
D
4321
D
C
B
A
ISSUE
DRAWING NO.
23425
DRAWING TITLE
Drawn by:
DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\L829CT5_6.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
Alpha 10 Amp Remote Bus
Circuit Diagram
L829CT5
SJB
10-Jul-1998
INITIALS
Date Printed 5 5Sheet of
Notes:
Near to PCB SK10AJACK3.5X2
Far from PCB
SK10B
JACK3.5X2
R210 1K5 SM
R211
4K7 SM
Remote In
Remote Out
R212 1K5 SM
Q57
BC859B
Remote Buffer
REMJK1
REMJKO1
REMJK2
Q_2
+UREG
R221
470R 1W CF
Q61
BC849B
R227
10R FU
+C83
100U EL
!
R80
10K SM
Q31
BC849B
R83
100R SM
+5V
R28
10K SM
R198
4K7 SM
Q37
BC849B
Q62 BC849B
R213
47R SM
R209
4K7 SM
+5V
Send
Break
R220
100K SM
L3
27MH C91
680P PP
C92
10N SM
R238 1K8 SM
R237
1K5 SM
R239
1K8 SM
R223 10K SM
3
2
1
Z13A
LM393A SM
R225
10K SM
R222
100K SM
+5V
5
67
Z13B
LM393A SM
R226
10K SM
R236 10K SM
+5V
Demod
Carrier Demodulator
C93
1N0 SM
84
Z13C
LM393A SM C97
100N SM
+5V
Carrier Filter
Demod
Raw RemRaw
Q_34
Q_35 Q_36
Q_37
Q_38
C98
220P SM
Q_39
Q_40
SJB
Hardware Remote RX
No Change
2SJB
26-9-97
22-9-9797_1085
97_1086
SJB R210, R198, R212 change
3
22-10-9797_1096
SJB No Change11-11-9797_1102
4
5
6
Q_65
1
34
6O1
TLP181 SM
Q_66
Q_67
Q_68
SJB PCB Issue 2 to 3 changes9-7-9898_1042

1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
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ISSUE
DRAWING NO.
23425 DRAWING TITLE
DRAWN BY CHK BY DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\PROJECTS\A10amp\CIRCS\display\L831ct_1.sch
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB 1 1Sheet of
ALPHA 10 AMP DISPLAY
Circuit Diagram
L831CT 1
2-Oct-1998
REQ
SDA
SCL
STBYLED
+8V Vin
I
GND
G
Vout O
Z1
7805
+5V
C1
100N CD
R1
3R3R FU
+8V
GND
1
VCC
2
NC
3
RS
4
R/W (WR)
5
E (RD)
6
DB0
7
DB1
8
DB2
9
DB3
10
DB4
11
DB5
12
DB6
13
DB7
14
Itron VFD Module
M1
ITRON_VFDM
C
3
B
2
A
1
SK3
ALPS_ENCODER
NEAR Z1, Z2
FOLD Z1 FLAT TO BOARD
PCB SILK SCREEN).
+8V +5V
GND
+5V
C5
100N CD
TAPE2_0
TAPE2_1
TAPE2_2
SOURCE_0
SOURCE_1
SOURCE_2
TAPE1_0
TAPE1_1
TAPE1_2
CLOCK
LOAD
DATA
VFD_D0
VFD_D1
VFD_D2
VFD_D3
VFD_RS
VFD_E
X1
CST4 00 SCL SDA
R11
10K MF R12 10K MF
PHASE_A
PHASE_B
+5V
PHASE_B
PHASE_A
+5V
TO PREAMPTO POWER AMP
3
2
1
+5V
O/P
GND Case RX1
SBX1610-52
C8
100N CD
LED1
LED GREEN
LED2
LED GREEN
LED3
LED GREEN
LED4
LED GREEN
LED5
LED GREEN
LED6
LED GREEN
LED7
LED GREEN
SW1
TACTSW2
SW2
TACTSW2
SW3
TACTSW2
SW4
TACTSW2
SW5
TACTSW2
SW6
TACTSW2
SW7
TACTSW2
SW8
TACTSW2
SW9
TACTSW2
SW10
TACTSW2
SW11
TACTSW2
D1
1N4148
D2
1N4148
D3
1N4148
D4
1N4148
R2
150R MF
R3
150R MF
R4
150R MF
R5
150R MF
R6
150R MF
R7
150R MF
R8
150R MF
ROW2
GND
GND
GND
GND
GND
GND
GND
D5
1N4148
D6
1N4148
D7
1N4148
D8
1N4148
D9
1N4148
D10
1N4148
D11
1N4148
ROW1
COL7
COL6
COL5
COL4
COL3
COL2
COL1
ROUT
ROW1
ROW2
R14
330R MF
R
G
LED100
LED RED/GRN
R13
150R MF
STBYLED
R15
4K7 MF R16 4K7 MF
ROW1 ROW2
RIN
ROUT
1 2
LK1
10MM LINK
CUT LK1 TO DISABLE R RECEIVER
Q1
BC557B
R10
4K7 MF
RIN
1
2
3
LK3
L815CA
1
2
3
LK2
L815CA
** SOCKETED **
+5V
R17
10K MF
SCL
SDA
REQ
STBYLED
LOAD
DATA
CLOCK
SCL
SDA
RIN
ROUT
REQ
STBYLED
LOAD
DATA
CLOCK
TAPE1_0
TAPE1_1
TAPE1_2
TAPE2_0
TAPE2_1
TAPE2_2
SOURCE_0
SOURCE_1
SOURCE_2
TAPE1_0
TAPE1_1
TAPE1_2
TAPE2_0
TAPE2_1
TAPE2_2
SOURCE_0
SOURCE_1
SOURCE_2
MCLR
1
RA0
2
RA1
3
RA2
4
RA3
5
RA4/T0CKI
6
RA5/SS
7
RE0/RD
8
RE1/WR
9
RE2/CS
10
VDD
11
VSS
12
OSC1/CLK N
13
OSC2/CLKOUT
14
RC0/T1OSI/T1CKI
15
RC1/T1OSO
16
RC2/CCP1
17
RC3/SCK/SCL
18
RD0/PSP0
19
RD1/PSP1
20 RD2/PSP2 21
RD3/PSP3 22
RC4/SDI/SDA 23
RC5/SDO 24
RC6 25
RC7 26
RD4/PSP4 27
RD5/PSP5 28
RD6/PSP6 29
RD7/PSP7 30
VSS 31
VDD 32
RB0/INT 33
RB1 34
RB2 35
RB3 36
RB4 37
RB5 38
RB6 39
RB7 40
Z2
PIC16C65
CLOCK
DATA
LOAD
TAPE1_0
TAPE1_1
TAPE1_2
TAPE2_0
TAPE2_1
TAPE2_2
SOURCE_0
SOURCE_1
SOURCE_2
COL7
COL6
COL5
COL4
COL3
COL2
COL1
LK1001
LINK10NP
LK1002
LINK10NP
LK1003
LINK10NP
LK1004
LINK10NP
LK1005
LINK10NP
LK1006
LINK10NP
LK1007
LINK10NP
LK1008
LINK10NP
LK1009
LINK10NP
LK1010
LINK10NP
C4
100N CD
VFD_D0
VFD_D1
VFD_D2
VFD_D3
VFD_E
VFD_RS
LK1012
LINK10NP
LK1013
LINK10NP
LK1015
LINK10NP
LK1016
LINK10NP
LK1017
LINK10NP
LK1018
LINK10NP
LK1019
LINK10NP
LK1020
LINK10NP
PCB
L831PB
L831PB
Update Box
(Small)
UDB
UPDATE_SML
Detail
Drilling
DD2
DRILL_DETAIL
PD1
TOOLINGPD2 TOOLING
PD3
TOOLINGPD4 TOOLING
PD5
TOOLINGPD6 TOOLING
PD7
TOOLINGPD8 TOOLING
PD9
TOOLING
PD10
TOOLING
PD11
TOOLING
PD12
TOOLING
PD13
TOOLING
PD14
TOOLING
PD100
TOOLING
PD101
TOOLING
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
SK1
FFC22H
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
SK2
FFC22H
9
8
7
6
5
4
3
2
1
RP1
100K X 8 COM
+5V
COL7
COL6
COL5
COL4
COL3
COL2
R9
4K7 MF
R20
100K MF
REQ
R_IN
R_OUT
PHIL 15/5/97
R18
100R MF
R19
100R MF
R21
100R MF
+C2
470U EL 25V
C3
100N CD
PWRLED
PWRLED
LK1011
LINK10NP
LK1014
LINK10NP LK1021
LINK10NP
+C6
220U EL
R22
100K MF
Q2
ZVNL120
RST
RST
LK1022
LINK10NP
BARCODE LABEL
EL1
BARCODE_A10_DISP
Issue Box
Drilling Detail
DD
DD_ISSUESML
P1
THRU_PIN
P2
THRU_PIN
P3
THRU_PIN
P4
THRU_PIN
P5
THRU_PIN
P6
THRU_PIN
P7
THRU_PIN
P8
THRU_PIN
P9
THRU_PIN
P10
THRU_PIN
P11
THRU_PIN
P12
THRU_PIN
P13
THRU_PIN

1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
ISSUE
DRAWING NO.
23425 DRAWING TITLE
DRAWN BY CHK BY DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\PROJECTS\A10amp\CIRCS\PREAMP\L832ct_1.sch
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB 1 1Sheet of
A10 Amp Pre-Amp PCB
Circuit Diagram
L832CT 1
2-Oct-1998
1
2
3
4
5
6
7
8
LK1
L823CA
EMC
1
N
F
SK1A
PHONO4G
N
F
SK1B
PHONO4G
EMC
1
N
F
SK2A
PHONO4G
N
F
SK2B
PHONO4G
EMC
1
N
F
SK3A
PHONO4G
N
F
SK3B
PHONO4G
EMC
1
N
F
SK4A
PHONO4G
N
F
SK4B
PHONO4G
EMC
1
SK5
PHONO2G
1
2
3
4
5
6
7
8
LK2
L832CA
+15V
-15V
Pre-Amp Audio Output
PASW1
NASW1
PAN1
NAN1
3
21
Z3A
OPA2134PA SM 5
67
Z3B
OPA2134PA SM
84
Z3C
OPA2134PA SM
3
21
Z4A
OPA2134PA SM
5
67
Z4B
OPA2134PA SM
84
Z4C
OPA2134PA SM
AUX1R
+15V
-15V
AUX1L
L
R
Phono PCB
1
2
3
4
5
6
7
8
LK1X
L823CA
PH15P
PHGND1
PHOR
PHGND2
PHGND3
PHOL
PHGND4
PH15N
R17
1K0 SM
R18
1K0 SM
R44
22K SM
R45
22K SM
CDR
CDL R19
1K0 SM
R20
1K0 SM
R46
22K SM
R47
22K SM
TUNERR
TUNERL R21
1K0 SM
R22
1K0 SM
R48
22K SM
R49
22K SM
AVR
AVL R23
1K0 SM
R24
1K0 SM
R50
22K SM
R51
22K SM
AUX2R
AUX2L R25
1K0 SM
R26
1K0 SM
R52
22K SM
R53
22K SM
TAPE1IR
TAPE1IL R27
1K0 SM
R28
1K0 SM
R54
22K SM
R55
22K SM
TAPE2IR
TAPE2IL R29
1K0 SM
R30
1K0 SM
R56
22K SM
R57
22K SM
X0
13
X1
14
X2
15
X3
12
X4
1
X5
5
X6
2
X7
4
INH
6
A
11
B
10
C
9
VEE
7
X3
GND
8
VDD 16
Z6
MAX4051 SM
X0
13
X1
14
X2
15
X3
12
X4
1
X5
5
X6
2
X7
4
INH
6
A
11
B
10
C
9
VEE
7
X3
GND
8
VDD 16
Z7
MAX4051 SM
Aux1L
Aux1R
CDL
CDR
TunerL
TunerR
AVL
AVR
Aux2L
Aux2R
Tape1IL
Tape1IR
Tape2IL
Tape2IR
Aux1L
Aux1R
X0
13
X1
14
X2
15
X3
12
X4
1
X5
5
X6
2
X7
4
INH
6
A
11
B
10
C
9
VEE
7
X3
GND
8
VDD 16
Z8
MAX4051 SM
X0
13
X1
14
X2
15
X3
12
X4
1
X5
5
X6
2
X7
4
INH
6
A
11
B
10
C
9
VEE
7
X3
GND
8
VDD 16
Z9
MAX4051 SM
X0
13
X1
14
X2
15
X3
12
X4
1
X5
5
X6
2
X7
4
INH
6
A
11
B
10
C
9
VEE
7
X3
GND
8
VDD 16
Z10
MAX4051 SM
X0
13
X1
14
X2
15
X3
12
X4
1
X5
5
X6
2
X7
4
INH
6
A
11
B
10
C
9
VEE
7
X3
GND
8
VDD 16
Z11
MAX4051 SM
CDL
TunerL
AVL
Aux2L
Aux1L
Tape2IL
PlugL
CDR
TunerR
AVR
Aux2R
Aux1R
Tape2IR
PlugR
CDL
TunerL
AVL
Aux2L
Aux1L
Tape1IL
PlugL
CDR
TunerR
AVR
Aux2R
Aux1R
Tape1IR
PlugR
CDL
TunerL
AVL
Aux2L
Aux1L
Tape1IL
Tape2IL
PlugL
CDR
TunerR
AVR
Aux2R
Aux1R
Tape1IR
Tape2IR
PlugR
3
21
Z12A
TL072 SM
5
67
Z12B
TL072 SM
84
Z12C
TL072 SM
3
21
Z13A
TL072 SM
5
67
Z13B
TL072 SM
84
Z13C
TL072 SM
R38
100K SM
R39 100K SM
R40
100K SM
R41 100K SM
R58
47R SM
R59
47R SM
R60
47R SM
R61
47R SM
Null_R
Null_L
GND AC
1
OUT1
2
GND1
3
IN1
4
GND AC
5
GND AC
6
VEE2
7
LOGIC GND
8
CLOCK
9
LOAD/SHIFT
10 DATA IN 11
DATA OUT 12
VDD1 13
GND AC 14
VDD2 15
GND AC 16
OUT2 17
VEE1 18
GND2 19
IN2 20
Z14
LM1972
-7V2
-7V2
-7V2
-7V2 -7V2
-7V2
+6V8
+6V8
+6V8
+6V8
+6V8
+6V8
+6V8
-7V2
-7V2
R64
1K5 SM1%
R65
1K5 SM1%
R66
6K8 SM1%
R67
6K8 SM1%
R62
47R SM
R63
47R SM
+15V +15V
-15V -15V
+15V
-15V
+15V
-15V
TAPE1OL
TAPE1OR
TAPE2OL
TAPE2OR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
SK7
FFC22V
R68 100K SM
R69 100K SM R70 100K SM
R71 100K SM R72 100K SM
R73 100K SM R74 100K SM
R75 100K SM R76 100K SM TAPE1_0
TAPE1_1
TAPE1_2
TAPE2_0
TAPE2_1
TAPE2_2
SOURCE_0
SOURCE_1
SOURCE_2
Tape1_0
Tape1_1
Tape1_2
Tape1_0
Tape1_1
Tape1_2
Tape2_0
Tape2_1
Tape2_2
Tape2_0
Tape2_1
Tape2_2
Source_0
Source_1
Source_2
Source_0
Source_1
Source_2
SETOFF
R14
10K SM
Source_0
Source_1
Source_2
Tape1_0
Tape1_1
Tape1_2
Tape2_0
Tape2_1
Tape2_2
R31
1K0 SM
DGND
R77
100R SM
LGND
R32
1K0 SM
R33
1K0 SM
R34
1K0 SM
Clock
Load
Data
CLOCK
LOAD
DATA
GND
Q_1
QPAD
Q_2
QPAD
Q_3
QPAD
Q_4
QPAD
Q_9QPAD Q_10QPAD Q_11QPAD
Q_12QPAD Q_13QPAD Q_14QPAD
Q_15QPAD Q_16QPAD Q_17QPAD
C33
1N0 SM
C34
1N0 SM
C35
1N0 SM
C36
1N0 SM
C37
1N0 SM
C38
1N0 SM
Q_18
QPAD
Q_19
QPAD
Q_20
QPAD
Q_21
QPAD
LOUT
ROUT
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
SK8
FFC32V Aux1L
Aux1R
CDL
CDR
AVL
AVR
Aux2L
Aux2R
Tape1IL
Tape1IR
Tape2IL
Tape2IR
TunerL
TunerR
PlugL
PlugR
To Plug-in PCB
PLUGINL
PLUGINR
R80 22K SM
R81 22K SM
TL1
TOOLING TL2 TOOLING
S.J.B.
FD_1
FIDUCIAL
FD_2
FIDUCIAL
BARCODE LABEL
Photo Strip
+6V8
-7V2
C10 680P PP
C11 680P PP
Detail
Drilling
TL3
TOOLING TL4 TOOLING
Update Box
PCB
L832PB
C1
10U NP
C3
10U NP
+
C31
22U EL
+
C32
22U EL
+6V8
-7V2
D1
6V8 400MW
D2
6V8 400MW
+15V
R1
1K0 SM
R2
1K0 SM
R3
56R SM
R4
56R SM
C8
1N0 SM
C9
1N0 SM
C15
47P SM
C16
47P SM
C17
47P SM
C18
47P SM
C19
47P SM
C20
47P SM
C21
47P SM
C22
47P SM
C23
47P SM
C24
47P SM
C25
47P SM
C26
47P SM
C13
47P SM
C14
47P SM
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
PL6
DIL16 VPLG
TL5
TOOLING_BIG TL6 TOOLING_BIG
R5
1K8 SM
Issue Box
Drilling Detail
DD1
DD_ISSUE
R6
100K SM
R7
100K SM
+C2
22U EL
+
C4
22U EL