H
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P
P
S
E MAN
ALPHA ONE/7R/8R/8P AMPLIFIER SERVICE MANUAL
2
amps or between 2.3 and 2.8mV for the Alpha 8R/8P
amps.
Leave the unit for 1 minute and reset to these values
if required.
Leave the unit for a further 5 minutes and reset if
required.
The IQ is now set and the unit can be connected to
speakers and fully checked out.
Disassembly For Servicing
1.
Remove the top cover and front panel.
2.
Remove 2 screws securing the sub front to the
chassis sides and 3 screws holding the
subfront to the chassis base.
3.
Remove 1 screw holding the pcb to the
chassis. This can be found near to the mains
inlet socket.
4.
Remove 5 screws from the rear panel, one at
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