General Checklist; Protection Modes; Short Circuit; Standby Mode - SPHINX Project10 Service Manual

SPHINX Project Ten

7. GENERAL CHECKLIST

Before you test or service the Project Ten please
check the following items. They will give information
about the current status of the amplifier.

Protection modes

The Project Ten has one protection mode.

Short Circuit

If the Left or Right output is shorted, fuse Z1 or Z2
will blow respectively.

Standby mode

The Project Ten will switch to Standby Mode if the:
•
Standby button on the front panel or
•
Standby button on the Remote is pressed.
In this Mode the following will happen:
•
The output relay is switched off.
•
The Control Output will be activated (red light).
•
The bias current for the Left and Right amplifiers
is reduced to 0 mA thus greatly decreasing the
operating temperature.
Service Manual

Necessary Equipment

To properly service the Project Ten you need some
specific measurement equipment and use a specific
set-up.
For the correct measurement set-up and hook-up
please refer to the drawing titled "Connection
Connection diagram... at pages 14 and 15.
q
2x millivolt-meter (Ri >1 MΩ)
2x non-inductive load resistor 8 Ω / 100 Watt
q
q
1x harmonic distortion analyser
(internal distortion <0.0005%, measured
without filters)
q
1x 2-channel oscilloscope
(minimum bandwidth >60 MHz)
q
1x connection unit / switch box
(to connect scope, resistors and amp outputs to
distortion analyser)
q
2x shorting connector
(for balanced pre-amp inputs)
q
2x balanced cable set
(to connect distortion analyser to Project Ten)
9