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ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
Arcam Alpha One/ 7R/ 8R/ 8P Amplifier Service Manual
Issue 1 Serial Number 001 - (Paul Newton/ Haider Bahrani Sept `98)
Circuit Description source for the differential input stage.
The Alpha One / 7R/8R and 8P share a common The output devices are 'n' channel mosfets SMF045.
pcb. The circuits are very similar and the main Zener diodes D103,104 limit the voltage swing within
differences are the remote volume facility and extra safe limits for the output devices & fusible resistors
power output on the 7R and 8R and a switch to R105, 106 provide overcurrent damage to the
bypass the phono stage to enable its use as an extra devices.
line level input and the AV processor switch on the
Alpha 8R integrated amplifier. The 8P power A proportion of the output current appears across the
amplifier utilises the same power amplifier circuit as protection network R41,42. If this becomes too high
the Alpha 8R integrated amplifier. Q17 is turned on and mutes the output. High D.C.
levels at the output will also mute the output. There
Power Supplies are no output fuses on the Alpha One, 7R and
8R/8P amplifiers. The muting is done by the mute ic
The ac output of the toroidal mains transformer is Z303 and its associated compontents. The mute
rectified and smoothed by D201-204 and C204, 205. operates on switch on/off and if an over current or
This is then regulated to +/-15V by Z201, 202 to over voltage condition occurs. The power led glows
power the phono and tone control stages and the amber when the mute circuit is operative and glows
d.c. servo. green in normal use.
The Alpha 7R and 8R transformers have an extra Removing the Alpha One/ 7R/ 8R/ 8P Transformer
tapping which is used for the remote volume circuit.
The ac in is regulated to 5V by zener D902 and The toroidal transformer is extremely well secured to
associated components and this is then used to the main pcb with a double sided adhesive gasket.
power the microcontroller Z901 and remote receiver. To remove the transformer you must break this
adhesive bond by cutting through the gasket. This
Phono Stage (Not applicable to Alpha One) will be easier if the transformer is warm.
Use a cheese wire under the transformer, pulling
The phono stage consists of a dual opamp Z305, one backwards and forwards under tension to gradually
opamp per channel. The RIAA equalization is cut through. Once most of the adhesive is cut, you
achieved by the feedback components R703, 704, should be able to pull the transformer away from the
702 and C704, 705, 702 on left channel (R603 etc. pcb.
as above for Right channel). R703 determines the
gain and C703 the low frequency roll off. A less satisfactory substitute for cheese wire is to use
some 22 gauge tinned copper wire, stretched first to
On the Alpha 8R this stage can be bypassed by use remove kinks, and two temporary handles.
of switch SW302 to enable use as an extra line input.
Alpha One/7R/ 8R/ 8P Quiescent Current (IQ)
Tone Controls Settings
The tone control stage is based around Z304 a dual When replacing the output transistors of the above
op amp. amplifiers it is important to reset the quiescent
The range of the controls is set by R507, 508 for the current (IQ) to the correct value to prevent the
bass pot RV302 and R509, 510 for the treble pot amplifier blowing again.
RV303.
The tone controls and balance pot can be bypassed The IQ should be checked and set by following the
by use of the direct switch, SW304. procedure below:
Power Amplifier From cold and with no load or signal connected
Turn both IQ presets (RV1 and RV101) down to
The input to the power amplifier from previous stages minimum (fully anticlockwise) and set the voltage
is fed to the differential input of Q112 and Q113. drop across resistor R1 (R101 for right hand channel)
Q110 and Q111 form a constant current to between 3.0 and 3.5mV for the Alpha One and 7R
1
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
amps or between 2.3 and 2.8mV for the Alpha 8R/8P Disassembly For Servicing
amps.
1. Remove the top cover and front panel.
Leave the unit for 1 minute and reset to these values 2. Remove 2 screws securing the sub front to the
if required. chassis sides and 3 screws holding the
subfront to the chassis base.
Leave the unit for a further 5 minutes and reset if 3. Remove 1 screw holding the pcb to the
required. chassis. This can be found near to the mains
inlet socket.
The IQ is now set and the unit can be connected to 4. Remove 5 screws from the rear panel, one at
speakers and fully checked out. each end and 3 along the bottom edge.
5. Remove the transformer bolt.
6. Release the PCB pillar located near to the
serial number on the pcb.
The pcb, with the rear panel, transformer and
subfront attached, can now be pulled backwards out
of the unit.
TEST POINT VOLTAGES
Test Point DC Voltage Alpha One DC Voltage Alpha 7R DC Voltage Alpha 8R/8P
1 32.8V 35V 37V
2 27.8V 29V 31V
3 15V 15V 15V
4 -32.8V -35V -37V
5 27.8V -29V -31V
6 -15V -15V -15V
7 N/A 0.09V 0.09V
8 N/A 0.10V 0.10V
9 0.3V 0.27V 0.27V
10 3.4V 3.2V 2.9V
11 32.8V 35V 37V
12 -3V -2.7V -2.5V
13 32.8V -35V -37V
Between 14 & 15 3.0 -3.5mV 3.0-3.5mV 2.3-2.8mV
16 (protection off) 0.0V 0.0V
16 (protection on) 0.6V 0.6V
17 0.0V 0.0V
18 0.0V 0.0V
19 0.0V 0.0V
2
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
Test Point DC Voltage Alpha One DC Voltage Alpha 7R DC Voltage Alpha 8R/8P
20 0.0V 0.0V 0.0V
21 (protection off) 1.6V 1.6V 1.6V
21 (protection on) 5.0V 5.0V 5.0V
22 0.58V 0.17V 0.17V
23 3.4V 3.1V 3.1V
24 -3V -2.7V -2.7V
25 -26V -29V -29V
Between 26 & 27 3.4mV 3.4mV 2.5mV
28 (muted) 35V 35V 35V
28 (protection off) 1V 1V 1V
29 N/A 5V 5V
30 N/A 10.5 10.5V
31 N/A 0V 0V
(volume going up)
31 N/A 5V 5V
(volume going down)
32 N/A 0V 0V
(volume going up)
32 N/A 5V 5V
(volume going down)
PARTS LISTS
The parts for all the units are as the Alpha 7 except where shown.
REF Description Part No Product C15 SUPPR CAP 4N7 250V 2K247 7R
C1 ELST 100U 100V 2N710B 7R C16 ELST 100U 25V 2N710 7R
C2 PEST 47N 63V 10% 2K347 7R C17 CERD 470P 63V 20% RA 2A147 7R
C3 PCRB 100N 100V 5% RA 2H410 7R C18 CERD 1N0 63V 20% RA 2A210 7R
5mm
C19 ELST 100U 25V 2N710 7R
C4 PEST 47N 63V 10% 2K347 7R
C20 CERD 470P 63V 20% RA 2A147 7R
C5 PSTY 33P 160V ENCAP 2F033 7R
1PF% C21 CERD 10N 63V 20% RA 2A310 7R
C7 PPRO 4N7 63V 5% RA 2D247N 7R C22 CERD 10N 63V 20% RA 2A310 7R
C8 PPRO 100P 63V 5% RA 2D110N 7R C23 SUPPR CAP 4N7 250V 2K247 7R
C9 ELST 100U 25V 2N710 A1 C24 PPRO 4N7 63V 5% RA 2D247N 7R
C10 ELST 22U 20V OSCON 2P622 7R C25 PCRB 100N 100V 5% RA 2H410 7R
5mm
C10 ELST 22U 63V ELECT 2N622 A1
C26 PCRB 100N 100V 5% RA 2H410 7R
C11 ELST 100U 100V 2N710B 7R 5mm
C12 ELST 100U 100V 2N710B 7R C27 ELST 220U 16V 2N722 7R
C13 PEST 15N 63V 10% 2K315 7R C28 PCRB 100N 100V 5% RA 2H410 7R
5mm
C14 PEST 15N 63V 10% 2K315 7R
3
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
C29 ELST 1U0 50V 20% RA 2N510 8R C205 ELST 6M8 35V RA 2N868 A1
C30 ELST 22U 63V ELECT 2N622 7R C206 PCRB 100N 100V 5% RA 2H410 7R
5mm
C30 ELLL 47U 10V ELECT 2R647 A1
C207 PCRB 100N 100V 5% RA 2H410 7R
C30 ELEC 10U 25V CERAFINE 2P610CC 8R 5mm
C101 ELST 100U 100V 2N710B 7R C208 PPRO 4N7 63V 5% RA 2D247N 7R
C102 PEST 47N 63V 10% 2K347 7R C209 PPRO 4N7 63V 5% RA 2D247N 7R
C103 PCRB 100N 100V 5% RA 2H410 7R C210 ELST 10U 50V 2N610 7R
5mm
C211 ELST 10U 50V 2N610 7R
C104 PEST 47N 63V 10% 2K347 7R
C212 CERD 10N 63V 20% RA 2A310 7R
C105 PSTY 33P 160V ENCAP 2F033 7R
1PF% C213 CERD 10N 63V 20% RA 2A310 7R
C107 PPRO 4N7 63V 5% RA 2D247N 7R C214 CERD 10N 63V 20% RA 2A310 7R
C108 PPRO 100P 63V 5% RA 2D110N 7R C215 CERD 10N 63V 20% RA 2A310 7R
C109 ELST 100U 25V 2N710 A1 C216 CERD 10N 63V 20% RA 2A310 7R
C110 ELST 22U 20V OSCON 2P622 7R C217 CERD 10N 63V 20% RA 2A310 7R
C110 ELST 22U 63V ELECT 2N622 A1 C301 CERD 10N 63V 20% RA 2A310 7R
C111 ELST 100U 100V 2N710B 7R C302 CERD 10N 63V 20% RA 2A310 7R
C112 ELST 100U 100V 2N710B 7R C502 PCRB 100N 100V 5% RA 2H410 A1
5mm
C113 PEST 15N 63V 10% 2K315 7R
C303 CERD 1N0 63V 20% RA 2A210 7R
C114 PEST 15N 63V 10% 2K315 7R
C304 CERD 1N0 63V 20% RA 2A210 7R
C116 ELST 100U 25V 2N710 7R
C305 CERD 47P 63V -20% +80% 2A047 7R
C117 CERD 470P 63V 20% RA 2A147 7R RA
C118 CERD 1N0 63V 20% RA 2A210 7R C306 CERD 47P 63V -20% +80% 2A047 7R
RA
C119 ELST 1U0 50V 20% RA 2N510 7R
C401 ELST 10U 50V 2N610 7R
C120 CERD 470P 63V 20% RA 2A147 7R
C402 PEST 220N 63V 10% 2K422 7R
C121 ELST 1U0 50V 20% RA 2N510 7R
C402 PCRB 100N 100V 5% RA 2H410 A1
5mm
C122 ELST 100U 25V 2N710 7R
C403 PCRB 100N 100V 5% RA 2H410 A1
C123 ELST 100U 25V 2N710 7R
5mm
C124 PPRO 4N7 63V 5% RA 2D247N 7R
C403 PEST 220N 63V 10% 2K422 7R
C125 PCRB 100N 100V 5% RA 2H410 7R
C404 PPRO 4N7 63V 5% RA 2D247N 7R
5mm
C404 2N2 PP 2D222 A1
C126 PCRB 100N 100V 5% RA 2H410 7R
5mm
C405 ELST 10U 50V 2N610 7R
C127 ELST 220U 16V 2N722 7R
C406 CERD 100P 63V 20% RA 2A110 7R
C128 PCRB 100N 100V 5% RA 2H410 7R
5mm C407 CERD 100P 63V 20% RA 2A110 7R
C130 ELST 22U 63V ELECT 2N622 7R C408 CERD 10P 63V 20% RA 2A010 7R
C130 ELLL 47U 10V ELECT 2R647 A1 C501 ELST 10U 50V 2N610 7R
C130 ELEC 10U 25V CERAFINE 2P610CC 8R C502 PEST 220N 63V 10% 2K422 7R
C200 CERD 1N0 63V 20% RA 2A210 7R C503 PEST 220N 63V 10% 2K422 7R
C201 SUPPR CAP 4N7 250V 2K247 7R C503 PCRB 100N 100V 5% RA 2H410 A1
5mm
C204 ELST 10m 50V RA 32mm 2N910 7R
C504 PPRO 4N7 63V 5% RA 2D247N 7R
C204 ELST 6M8 35V RA 2N868 A1
C504 2N2 PP 2D222 A1
C205 ELST 10m 50V RA 32mm 2N910 7R
C505 ELST 10U 50V 2N610 7R
4
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
C506 CERD 100P 63V 20% RA 2A110 7R D9 RECTIFIER 1N4003F 1A 3B4003 7R
200V
C507 CERD 100P 63V 20% RA 2A110 7R
D10 ZENER 5V6 400MW 3C05604 8R
C508 CERD 10P 63V 20% RA 2A010 7R
D101 RECTIFIER 1N4003F 1A 3B4003 7R
C601 PPRO 100P 63V 5% RA 2D110N 7R 200V
C602 CERD 47P 63V 20% RA 2A047 7R D102 ZENER 10V 400MW 3C11004 7R
C603 ELST 22U 63V 2N622 7R D103 ZENER 10V 400MW 3C11004 7R
C604 PPRO 4N7 63V 5% RA 2D247N 7R D104 ZENER 10V 400MW 3C11004 7R
C605 PPRO 1N3 63V 5% RA 2D213N 7R D105 RECTIFIER 1N4003F 1A 3B4003 7R
200V
C606 ELST 10U 50V 2N610 7R
D106 RECTIFIER 1N4003F 1A 3B4003 7R
200V
C701 PPRO 100P 63V 5% RA 2D110N 7R
D107 RECTIFIER 1N4003F 1A 3B4003 7R
C702 CERD 47P 63V 20% RA 2A047 7R
200V
C703 ELST 22U 63V 2N622 7R
D108 ZENER 5V6 400MW 3C05604 7R
C704 PPRO 4N7 63V 5% RA 2D247N 7R
D201 ULTRAFAST RECTIFIER 3B5403F 7R
DIODE UF5403 3A
C705 PPRO 1N3 63V 5% RA 2D213N 7R
D202 ULTRAFAST RECTIFIER 3B5403F 7R
C706 ELST 10U 50V 2N610 7R DIODE UF5403 3A
C801 PPRO 100P 63V 5% RA 2D110N 7R D203 ULTRAFAST RECTIFIER 3B5403F 7R
DIODE UF5403 3A
C802 PPRO 100P 63V 5% RA 2D110N 7R
D204 ULTRAFAST RECTIFIER 3B5403F 7R
C803 ELST 10U 50V 2N610 7R DIODE UF5403 3A
C804 ELST 10U 50V 2N610 7R D801 ZENER 5V6 400MW 3C05604 7R
C805 CERD 10N 63V 20% RA 2A310 7R D802 ZENER 4V7 400MW 3C04704 7R
C806 CERD 10N 63V 20% RA 2A310 7R D803 SSDIODE 1N4148 75V 3A4148 7R
C901 CERD 10N 63V 20% RA 2A310 7R D901 RECTIFIER 1N4003F 1A 3B4003 7R
200V
C902 ELST 220U 16V 2N722 7R
D902 ZENER 5V6 400MW 3C05604 7R
C903 CERD 10N 63V 20% RA 2A310 7R
D903 RECTIFIER 1N4003F 1A 3B4003 7R
C904 CERD 10N 63V 20% RA 2A310 7R 200V
C905 CERD 10N 63V 20% RA 2A310 7R D904 ZENER 5V6 400MW 3C05604 7R
C906 CERD 10N 63V 20% RA 2A310 7R D905 SSDIODE 1N4148 75V 3A4148 7R
C907 ELST 1M0 25V 2N810 7R EL1 FUSE CLIP WCK-180-01A F062 7R
C1000 CERD 10N 63V 20% RA 2A310 7R FS201 INS COVER PCB F022 7R
FUSEHOLDER
CL1 ALPHA AMP 7/8 HEATSINK E82201 7R
CLAMP FS201 FUSE 20mm 1.25A AS C12126 7R
CL2 ALPHA AMP 7/8 HEATSINK E82201 7R FS201 FUSEHOLDER 20mm PCB 8S004 7R
CLAMP
FS202 FUSEHOLDER 20mm PCB 8S004 7R
D1 RECTIFIER 1N4003F 1A 3B4003 7R
200V FS202 INS COVER PCB F022 7R
FUSEHOLDER
D2 ZENER 10V 400MW 3C11004 7R
HS1 ALPHA AMP 7/8 HEATSINK E81801 7R
D3 ZENER 10V 400MW 3C11004 7R
HS1 SIL PAD - 25 X 12.5mm E817MC 7R
D4 ZENER 10V 400MW 3C11004 7R
HS1 ALPHA AMP 7/8 HS CLIP E810MC 7R
D5 SSDIODE 1N4148 75V 3A4148 7R
HS2 SIL PAD - 25 X 12.5mm E817MC 7R
D6 RECTIFIER 1N4003F 1A 3B4003 8R
200V HS2 ALPHA AMP 7/8 HEATSINK E81801 7R
D7 SSDIODE 1N4148 75V 3A4148 7R HS2 ALPHA AMP 7/8 HS CLIP E810MC 7R
D8 RECTIFIER 1N4003F 1A 3B4003 7R HS3 SIL PAD - 25 X 12.5mm E817MC 7R
200V
5
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
HS3 ALPHA AMP 7/8 HEATSINK E81801 7R Q104 TRANS LF SS N BC546B 4A546 7R
HS3 ALPHA AMP 7/8 HS CLIP E810MC 7R Q105 TRANS LF SS P BC556B 4A556 7R
HS4 SIL PAD - 25 X 12.5mm E817MC 7R Q106 TRANS LF SS P BC556B 4A556 7R
HS4 ALPHA AMP 7/8 HS CLIP E810MC 7R Q107 TRANS LF SS P BC556B 4A556 7R
HS4 ALPHA AMP 7/8 HEATSINK E81801 7R Q108 TRANS LF SS N BC546B 4A546 7R
L1 INDUCT 2U2 12x20mm 7D002B 7R Q110 TRANS LF SS N BC547B 4A547 7R
L101 INDUCT 2U2 12x20mm 7D002B 7R Q111 TRANS LF SS N BC547B 4A547 7R
LED201 LED RED/GREEN 5MM 3D002 7R Q112 TRANS LF SS N BC547B 4A547 7R
LK19 RES MF W4 3K3 1% 1H233 7R Q113 TRANS LF SS N BC547B 4A547 7R
LK19A A8R AMP MBD TO AV L835CA 8R Q114 TRANS LF SS P BC557B 4A557 7R
SWITCH CABLE
Q115 TRANS LF SS N BC546B 4A546 7R
LK20 RES MF W4 3K3 1% 1H233 7R
Q116 TRANS LF SS P BC557B 4A557 7R
LK311 7-WAY RIBBON 250mm L825CA 7R
Q117 TRANS LF SS N BC546B 4A546 7R
LK805 JUMPER 3 WAY x 125mm L815CA 7R
Q118 TRANS LF SS N BC546B 4A546 7R
LK901 JUMPER 8-WAY LEAD L809CA 7R
Q119 TRANS LF SS N BC546B 4A546 7R
LK902 JUMPER 3 WAY x 125mm L815CA 7R
Q120 TRANS LF SS N 2SC2547 4A2546 7R
MS MAINS SWITCH SPACER E66901 7R
PL1 16 WAY DIL PIN HEADER 8K6316 8P
PCB PRINTED CIRCUIT BOARD L846PB 7R
R1A RES MO 3W 5% 0R22 1Q922 7R
Q1 TRANS PWR MOSFET 4K045 7R KOASPR3
IRF540/SMF045
R1 RES MO 3W 5% 0R22 1Q922 7R
Q2 TRANS PWR MOSFET 4K045 7R KOASPR3
IRF540/SMF045
R2 RES CF W2 4R7 5% 1D847 7R
Q3 TRANS LF SS P BC556B 4A556 7R
R3 RES CF W4 5% 2R2 1B822 7R
Q4 TRANS LF SS N BC546B 4A546 7R
R4 RES MF FU W3 100R 5% 1G110 7R
Q5 TRANS LF SS P BC556B 4A556 7R NFR25
Q6 TRANS LF SS P BC556B 4A556 7R R5 RES MF FU W3 100R 5% 1G110 7R
NFR25
Q7 TRANS LF SS P BC556B 4A556 7R
R6 RES MF FU W3 100R 5% 1G110 7R
Q8 TRANS LF SS N BC546B 4A546 7R NFR25
Q9 TRANS LF SS N BC546B 4A546 7R R7 RES MF FU W3 470R 5% 1G147 7R
NFR25
Q10 TRANS LF SS N BC547B 4A547 7R
R8 RES MF FU W3 470R 5% 1G147 7R
NFR25
Q11 TRANS LF SS N BC547B 4A547 7R
R9 RES MF FU W3 470R 5% 1G147 7R
Q12 TRANS LF SS N BC547B 4A547 7R
NFR25
Q13 TRANS LF SS N BC547B 4A547 7R
R10 RES MF FU W3 470R 5% 1G147 7R
NFR25
Q14 TRANS LF SS P BC557B 4A557 7R
R11 RES MF FU W3 470R 5% 1G147 7R
Q15 TRANS LF SS N BC546B 4A546 7R NFR25
Q16 TRANS LF SS P BC557B 4A557 7R R12 RES MF FU W3 470R 5% 1G147 7R
NFR25
Q17 TRANS LF SS N BC546B 4A546 7R
R13 RES MF W4 1% 1K0 1H210 7R
Q18 TRANS LF SS N BC546B 4A546 7R
R14 RES MF W4 1% 1K0 1H210 7R
Q19 TRANS LF SS P BC556B 4A556 7R
R15 RES CF W4 5% 1K0 1B210 7R
Q101 TRANS PWR MOSFET 4K045 7R
IRF540/SMF045 R16 RES MF W4 1% 2K7 1H227 7R
Q102 TRANS PWR MOSFET 4K045 7R R17 RES MF W4 1% 5K6 1H256 7R
IRF540/SMF045
R18 RES MF W4 1% 2K7 1H227 7R
Q103 TRANS LF SS P BC556B 4A556 7R
6
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
R19 RES CF W4 5% 5K6 1B256 7R R61 RES MF W4 18K 1% 1H318 7R
R20 RES MF W4 1% 15K 1H315 7R R62 RES MF W4 18K 1% 1H318 7R
R21 RES MF W4 1% 100R 1H110 7R R63 RES MF W4 1% 56K 1H356 8R
R22 RES MF W4 1% 120R 1H112 7R R64 RES MF W4 1% 56K 1H356 8R
R23 RES MF W4 1% 2K7 1H227 7R R70 RES MF W4 1% 680R 1H168 7R
R24 RES MF W4 1% 2K7 1H227 7R R101A RES MO 3W 5% 0R22 1Q922 7R
KOASPR3
R25 RES MF W4 1% 330R 1H133 7R
R101 RES MO 3W 5% 0R22 1Q922 7R
R26 RES MF FU W3 470R 5% 1G147 7R KOASPR3
NFR25
R102 RES CF W2 4R7 5% 1D847 7R
R27 RES MF FU W3 470R 5% 1G147 7R
NFR25 R103 RES CF W4 5% 2R2 1B822 7R
R28 RES MF W4 18K 1% 1H318 7R R104 RES MF FU W3 100R 5% 1G110 7R
NFR25
R29 RES MF W4 1% 1K2 1H212 7R
R105 RES MF FU W3 100R 5% 1G110 7R
R30 RES MF W4 1% 33K 1H333 7R NFR25
R31 RES CF W4 5% 1K0 1B210 A1 R106 RES MF FU W3 100R 5% 1G110 7R
NFR25
R32 RES MF W4 1% 33K 1H333 A1
R107 RES MF FU W3 470R 5% 1G147 7R
NFR25
R33 RES MF W4 1% 680K 1H468 A1
R108 RES MF FU W3 470R 5% 1G147 7R
R34 RES MF W4 1% 1K0 1H210 7R
NFR25
R34 RES MF W4 1K6 1% 1H216 A1
R109 RES MF FU W3 470R 5% 1G147 7R
NFR25
R35 RES MF W4 1% 33K 1H333 7R
R110 RES MF FU W3 470R 5% 1G147 7R
R36 RES MF FU W3 100R 5% 1G110 7R NFR25
NFR25
R111 RES MF FU W3 470R 5% 1G147 7R
R39 RES MF W4 18K 1% 1H318 7R NFR25
R40 RES MF W4 1% 33K 1H333 A1 R112 RES MF FU W3 470R 5% 1G147 7R
NFR25
R41 RES MF FU W3 470R 5% 1G147 7R
NFR25 R113 RES MF W4 1% 1K0 1H210 7R
R42 RES MF W4 1% 620R 1H162 7R R114 RES MF W4 1% 1K0 1H210 7R
R43 RES MF W4 1% 22K 1H322 8R R115 RES CF W4 5% 1K0 1B210 7R
R44 RES MF W4 1% 68K 1H368 7R R116 RES MF W4 1% 2K7 1H227 7R
R45 RES MF W4 18K 1% 1H318 7R R117 RES MF W4 1% 5K6 1H256 7R
R46 RES MF W4 1% 150R 1H115 7R R118 RES MF W4 1% 2K7 1H227 7R
R47 RES MF W4 1% 4K7 1H247 7R R119 RES CF W4 5% 5K6 1B256 7R
R48 RES MF W4 1% 47K 1H347 7R R120 RES MF W4 1% 15K 1H315 7R
R49 RES CF 1W 330R 5% 1E133 7R R121 RES MF W4 1% 100R 1H110 7R
R50 RES CF W2 100R 5% 1D110 7R R122 RES MF W4 1% 120R 1H112 7R
R51 RES MF W4 1% 15K 1H315 7R R123 RES MF W4 1% 2K7 1H227 7R
R52 RES MF W4 1% 3K9 1H239 7R R124 RES MF W4 1% 2K7 1H227 7R
R53 RES MF W4 18K 1% 1H318 7R R125 RES MF W4 1% 330R 1H133 7R
R54 RES MF W4 1% 68K 1H368 7R R126 RES MF FU W3 470R 5% 1G147 7R
NFR25
R55 RES MF W4 1% 22K 1H322 7R
R127 RES MF FU W3 470R 5% 1G147 7R
R56 RES MF W4 1% 22K 1H322 7R NFR25
R57 RES CF 1W 2K7 5% 1E227 8R R128 RES MF W4 18K 1% 1H318 7R
R58 RES MF W4 1% 1K8 1H218 7R R129 RES MF W4 1% 1K2 1H212 7R
7
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
R130 RES MF W4 1% 33K 1H333 7R R203 RES MF FU W3 470R 5% 1G147 7R
NFR25
R131 RES CF W4 5% 1K0 1B210 A1
R204 RES MF FU W3 470R 5% 1G147 7R
R132 RES MF W4 1% 33K 1H333 A1 NFR25
R133 RES MF W4 1% 680K 1H468 A1 R205 RES MF FU W3 470R 5% 1G147 7R
NFR25
R134 RES MF W4 1% 1K0 1H210 7R
R206 RES MF FU W3 470R 5% 1G147 7R
NFR25
R134 RES MF W4 1K6 1% 1H216 A1
R207 RES MF W4 1% 100R 1H110 7R
R135 RES MF W4 1% 33K 1H333 7R
R401 RES MF W4 1% 1K8 1H218 7R
R136 RES MF FU W3 100R 5% 1G110 7R
NFR25
R402 RES MF W4 1% 47K 1H347 7R
R139 RES MF W4 18K 1% 1H318 7R
R403 RES MF W4 1% 2K2 1H222 7R
R140 RES MF W4 1% 33K 1H333 A1
R404 RES MF W4 6K8 1% 1H268 7R
R141 RES MF FU W3 470R 5% 1G147 7R
NFR25 R405 RES MF W4 1% 4K7 1H247 7R
R142 RES MF W4 1% 620R 1H162 7R R406 RES MF W4 1% 220R 1H122 7R
R145 RES MF W4 18K 1% 1H318 7R R406 RES MF W4 470R 1% 1H147 A1
R146 RES MF W4 1% 150R 1H115 7R R407 RES MF W4 1% 4K7 1H247 7R
R147 RES MF W4 1% 4K7 1H247 7R R407 RES MF W4 12K 1% 1H312 A1
R149 RES CF 1W 330R 5% 1E133 7R R408 RES MF W4 1% 4K7 1H247 7R
R150 RES CF W2 100R 5% 1D110 7R R408 RES MF W4 12K 1% 1H312 A1
R151 RES MF W4 1% 15K 1H315 7R R409 RES MF W4 3K3 1% 1H233 7R
R152 RES MF W4 1% 3K9 1H239 7R R409 RES MF W4 6K8 1% 1H268 A1
R153 RES MF W4 1% 47K 1H347 7R R410 RES MF W4 3K3 1% 1H233 7R
R154 RES MF W4 1% 47K 1H347 7R R410 RES MF W4 6K8 1% 1H268 A1
R155 RES MF W4 1% 47K 1H347 7R R411 RES MF W4 1% 4K7 1H247 7R
R156 RES MF FU W3 470R 5% 1G147 7R R411 RES MF W4 10K 1% 1H310 A1
NFR25
R412 RES MF W4 1% 10K 1H310 7R
R157 RES MF W4 1% 100K 1H410 7R
R412 RES MF W4 18K 1% 1H318 A1
R158 RES MF W4 1% 47K 1H347 7R
R415 RES MF W4 3K3 1% 1H233 7R
R159 RES MF W4 1% 100K 1H410 7R
R416 RES MF W4 1% 1K8 1H218 7R
R160 RES MF W4 10K 1% 1H310 7R
R501 RES MF W4 1% 1K8 1H218 7R
R161 RES CF 1W 1K0 5% 1E210 7R
R502 RES MF W4 1% 47K 1H347 7R
R161 RES CF 1W 330R 5% 1E133 A1
R503 RES MF W4 1% 2K2 1H222 7R
R162 RES MF W4 1% 47K 1H347 7R
R504 RES MF W4 6K8 1% 1H268 7R
R163 RES MF W4 1% 33K 1H333 7R
R505 RES MF W4 1% 4K7 1H247 7R
R164 RES MF W4 18K 1% 1H318 7R
R506 RES MF W4 1% 220R 1H122 7R
R165 RES MF W4 1% 47K 1H347 7R
R506 RES MF W4 470R 1% 1H147 A1
R166 RES CF 1W 2K7 5% 1E227 7R
R507 RES MF W4 1% 4K7 1H247 7R
R167 RES CF 1W 2K7 5% 1E227 7R
R507 RES MF W4 12K 1% 1H312 A1
R170 RES MF W4 1% 680R 1H168 7R
R508 RES MF W4 1% 4K7 1H247 7R
R201 RES MF FU W3 470R 5% 1G147 7R
NFR25 R508 RES MF W4 12K 1% 1H312 A1
R202 RES MF FU W3 470R 5% 1G147 7R R509 RES MF W4 3K3 1% 1H233 7R
NFR25
R509 RES MF W4 6K8 1% 1H268 A1
8
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
R510 RES MF W4 3K3 1% 1H233 7R R901 RES MF FU W3 1R0 5% 1G810 7R
NFR25
R510 RES MF W4 6K8 1% 1H268 A1
R902 RES MF W4 1% 100R 1H110 7R
R511 RES MF W4 1% 4K7 1H247 7R
R903 RES MF W4 1% 100R 1H110 7R
R511 RES MF W4 10K 1% 1H310 A1
R904 RES MF W4 1% 1K8 1H218 7R
R512 RES MF W4 1% 10K 1H310 7R
R905 RES MF W4 1% 4K7 1H247 7R
R512 RES MF W4 18K 1% 1H318 A1
RLY1 RELAY G5Z-2A-E 24V A207 7R
R515 RES MF W4 3K3 1% 1H233 7R
RLY2 RELAY 960 OHM 51SB12T A205 8R
R516 RES MF W4 1% 1K8 1H218 7R
RV1 10K PSET 6F310 7R
R601 RES MF W4 1% 47K 1H347 7R
RV101 10K PSET 6F310 7R
R602 RES MF W4 1% 470R 1H147 7R
RV301 POT 20KA* 2 LOG A 6A320L A1
R603 RES MF W4 1% 680K 1H468 7R
RV302 POT 10KB* 2 LIN 6A310E 7R
R604 RES MF W4 1% 56K 1H356 7R
RV303 POT 10KB* 2 LIN 6A310E 7R
R605 RES MF W4 1% 820R 1H182 7R
RV304 POT 10KB* 2 LIN 6A310E 7R
R701 RES MF W4 1% 47K 1H347 7R
RV901 POT 20KA DUAL 18MM 6A360M 7R
R702 RES MF W4 1% 470R 1H147 7R MOTORISED
R703 RES MF W4 1% 680K 1H468 7R RX1 REMOTE CONTROL B2103 7R
RECEIVER SBX1610-62
R704 RES MF W4 1% 56K 1H356 7R
SK1 CAMCON BINDING POST 8D418 7R
4WAY NICKEL
R705 RES MF W4 1% 820R 1H182 7R
SK1 CANCON BINDING POST 8D418G 8R/8P
R801 RES MF W4 1% 4K7 1H247 7R
4WAY GOLD
R801 RES MF W4 560R 1% 1H156 8P
SK2 CAMCON BINDING POST 8D418 7R
4WAY NICKEL
R802 RES MF W4 1% 100K 1H410 7R
SK2 CANCON BINDING POST 8D418G 8R/8P
R802 RES MF W4 3K9 1% 1H239 8P 4WAY GOLD
R803 RES MF W4 1% 2K4 1H224 7R SK3 STEREO JACK PCB 8D301 7R
R804 RES MF W4 1% 5K6 1H256 7R SK4 CAGE CLAMP 16A 3 WAY 8Q001 7R
ARC001-236
R805 RES MF W4 1% 4K7 1H247 7R
SK5 CAGE CLAMP 16A 1 WAY 8Q003 7R
R805 RES MF W4 560R 1% 1H156 8P ARC003-236
R806 RES MF W4 1% 100K 1H410 7R SK6 CAGE CLAMP 16A 2WAY 8Q005 7R
236-402/000-009
R806 RES MF W4 3K9 1% 1H239 8P
SK7 CAGE CLAMP 16A 3 WAY 8Q004 7R
R807 RES MF W4 1% 2K4 1H224 7R ARC004-236
R808 RES MF W4 1% 5K6 1H256 7R SK201 IEC MAINS CONN PCB INS 8A001 7R
PX
R809 RES MF W4 1% 100K 1H410 7R
SK301 PHONO SKT 4-WAY EMC 8D224 7R
R810 RES MF W4 1% 100K 1H410 7R
SK301 PHONO SKT 4-WAY EMC 8D225 8R/8P
GOLD
R811 RES MF W4 1% 220R 1H122 7R
SK302 PHONO SKT 4-WAY EMC 8D224 7R
R812 RES MF W4 1% 220R 1H122 7R
SK302 PHONO SKT 4-WAY EMC 8D225 8R/8P
R813 RES MF W4 1% 22K 1H322 7R GOLD
R814 RES MF W4 1% 22K 1H322 7R SK303 PHONO SKT 4-WAY EMC 8D224 7R
R815 RES MF W4 1% 1K2 1H212 7R SK303 PHONO SKT 4-WAY EMC 8D225 8R/8P
GOLD
R816 RES MF W4 1% 1K2 1H212 7R
SK304 PHONO SKT 4-WAY EMC 8D224 7R
R817 RES MF W4 18K 1% 1H318 7R
SK304 PHONO SKT 4-WAY EMC 8D225 8R/8P
R818 RES MF W4 1% 8K2 1H282 8P GOLD
R819 RES MF W4 1% 8K2 1H282 8P SW1 SWITCH SLIDE 2WAY C/O A1403 8R
PANEL MNT PCB
9
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
SW201 SW PUSH MAINS A1007 7R
SDDSA32MZU
SW302 SW PUSH 4PCO A1013 8R
SW305 SWITCH SRBU 150 44A A1202 7R
SW305 SWITCH 4POLE SRBU A1212 8R
5WAY
TX1 ALPHA 7 AMP MULTI L835TX 7R
VOLTAGE TRANSFORM
TX1 ALPHA 1/5.2 L841TX A1
TRANSFORMER 230V
TX1 ALPHA 8 AMP MULTI L833TX 8R/8P
VOLTAGE TRANSFORM
VOLMOT JUMPER 2 W LEAD APL5 1Y271 7R
X901 CER RESON CST4.19MG 7W002 7R
4.19MHz
Y1 TX WIRE RESTRAINT F185 7R
Y2 TX WIRE RESTRAINT F185 7R
Z201 IC VREG POS 7815 5D7815 7R
Z202 IC VREG NEG 7915 5D7915 7R
Z300 IC AUDIO DUAL 4560D 5B4560 7R
Z301 IC AUDIO DUAL NE5532N 5A5532 A1
Z302 IC AUDIO DUAL 4560D 5B4560 7R
Z303 IC COMPARITOR TA7317P 5M7317 7R
Z304 IC AUDIO DUAL 4560D 5B4560 7R
Z305 IC AUDIO DUAL NE5532N 5A5532 7R
Z305 IC AUDIO DUAL OP275 5B275 8R
Z801 IC HCMOS PC74HC4052P 5F4052P 7R
ONLY
Z901 IC SOCKET 18 PIN 0.3'' 8S018 7R
Z901 IC CMOS MICRO 5H16C54X 7R
PIC16C54XT/P
Z902 MOTOR DRIVER 5Q6109 5Q6109 7R
10
1 2 3 4 5 6 7 8
LK1001 LK1007 LK1013 LK1019 LK1025 LK1031 LK1037 LK1043 LK1049 LK1055 LK1067 LK1073 LK1079 LK1085 LK1091 LK1097 LK1103 LK1109 LK1115 LK1121 LK1127 LK1133
LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP
LK1002 LK1008 LK1014 LK1020 LK1026 LK1032 LK1038 LK1044 LK1050 LK1056 LK1062 LK1068 LK1074 LK1080 LK1086 LK1092 LK1098 LK1104 LK1110 LK1116 LK1122 LK1128 LK1134
LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP
LK1003 LK1009 LK1015 LK1021 LK1027 LK1033 LK1039 LK1045 LK1051 LK1057 LK1063 LK1069 LK1075 LK1081 LK1087 LK1093 LK1099 LK1105 LK1111 LK1117 LK12 LK1129 LK1135
LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP
D D
LK1004 LK1010 LK1016 LK1028 LK1034 LK1046 LK1052 LK1058 LK1064 LK1070 LK1076 LK1082 LK1088 LK1094 LK1100 LK1106 LK1112 LK1118 LK13
LK1130 LK1136
LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP
LINK10NP LINK10NP
LK1005 LK1011 LK1017 LK1023 LK1029 LK1035 LK1041 LK1047 LK1053 LK1059 LK1065 LK1071 LK1077 LK1083 LK1089 LK1095 LK1101 LK1107 LK1113 LK1119 LK1125 LK1131 LK1137
LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP
LK1006 LK1012 LK1018 LK1024 LK1030 LK1036 LK1042 LK1048 LK1054 LK1060 LK1066 LK1072 LK1078 LK1084 LK1090 LK1096 LK1102 LK1108 LK1114 LK1120 LK14 LK1132 LK1138
LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP LINK10NP
PD8 PD9
PD2 PD3 PD4 PD5 PD7 TARGET1 TARGET1 PD10 PD11 PD12 PD13 PD14 Y1 Y2
MAINS INPUT TOOLING TOOLING TOOLING TOOLING TOOLING TOOLING TOOLING TOOLING TOOLING TOOLING TX WIRE CLIP TX WIRE CLIP
SK201
IEC3 C200
1N0 CD
N E L ACLT1
PSUP P15V
TP1
+37V Z201
N
L
E
TP2
TX1 GREY1 R204 470R FU
SK6 D203 7815 P15V
I O TP3
1 Vin Vout
C15 Grey GREY2
GND
MAINS_N 9Vac 2 UF5403 R205 470R FU
4N7 MAINS SELECT VOLTAGE Grey
BY FITTING FS201
C C23 OR FS202 CAGECLAMP2 C
G
4N7 MAINS + C204 R206 470R FU
T2 C206
MAINS_E 230V + C210
10M EL 50V 100N PC C208 10U EL
OR1
D204
POWRE 4N7 PP
MAINS_L
3 1 UF5403
FS201 T3 Orange Orange BLUE1
2 115V 2
AS1A25 Dark Grey Blue
MAINS SWITCH 1 3
Blue Orange
SW201A SW201B C201
SK4 SK7
OR2
A1007 4N7 MAINS
A1007
FS202 CAGECLAMP3
CAGECLAMP3A C209
AS2A5_115V + C211
T1 BLUE2 L833TX 4N7 PP
D201 + C205 C207 10U EL
SK5 100N PC
GREEN 1 SCREEN 10M EL 50V
Green UF5403
G
CAGECLAMP1 R201
W10
470R FU
GND
PD1 D202
FIT ONLY ONE FUSE R202 I O TP6
Vin Vout
TOOLING Chassis Earth Point, 470R FU
TP4
TP5
Use correct screw and washer. UF5403 Z202 N15V
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