D65Z
D130Z
D250Z
8 CHANNEL POWER AMPLIFIERS
POWER SWITCH
The front panel label "D65", "D130" or "D250" and the on/off symbol is a switch used to apply or remove A/C line
power to the D65/130/250Z soft start circuitry. Push the switch and the D65/130/250Z will initiate the start up sequence.
The switch button remains depressed when circuits are on. Push the switch again the D65/130/250Z will initiate the
power off sequence.
LED INDICATORS
Each D65/130/250Z channel has a single multi-colour LED indicator to monitor the following conditions:
●
Unlit LED:
no power
The D65/130/250Z channel LED, when unlit, indicates no A/C mains power is present at the channel. If all channel
LED indicators are unlit the D65/130/250Z probably needs only to be powered on. A group of 4 LEDs not lighting
possibly indicates a blown group fuse (there are 2 fuses, one for each group of 4 channels). When checking fuses
turn off the unit and unplug the power cord. Use only the specified fuses for your operating voltage.
See
FUSES
section below and
Replacement Fuses
label on rear panel.
●
Green LED:
operating normally
●
Red LED:
- During Power-Up =
mute
Each channel normally mutes momentarily during power up and power down sequences.
-
After Power-Up =
Thermal Shutdown or Clipping
THERMAL SHUTDOWN
: The D65/130/250Z channel has thermal shutdown circuitry to prevent damage due to
over heating. Should thermal shutdown occur, the both stereo channels in the affected zone will mute and the
channel LEDs will turn red. When the channels have cooled to a safe operating condition the channels will return
to normal operation. Persistent thermal shutdown indicates steps need to be taken to increase airflow across the
channels heat sink. (
See installation section on ventilation on page 1)
CLIPPING
occurs when the channel output level no longer can follow the level increase at the input (Over driven
input condition). When a D65/130/250Z channel is driven into clipping the channel LED will change from green to
red then back to green when the level is reduced (will appear to be intermittent or flashing red). Momentary clip-
ping can be tolerated, however it indicates that maximum un-distorted power has been surpassed and potential
speaker damage may result if over load conditions persist. Any amplifier that is constantly operated into clipping
indicates a more powerful amplifier is needed for that application. Note that a steady red LED may indicate either
continuous clipping (overload) or thermal shutdown.
<
FUSES
External fuses:
There are two fuse holders located at the rear panel (see illustration on next page). One fuse is
for channels numbered 1 through 4 which comprise zones 1 & 2. The second fuse is for channels
5 through 8 which comprise zones 3 & 4. When checking fuses, power down the unit and dis-
connect the power cord. Use only the specified fuses as indicated on the fuse specification label
located on the rear panel.
Internal fuses:
There are two additional fuses located inside the unit, on the
SoftStart
(power inlet) board. These
fuses have a slightly higher melting point, compared to the external fuses, so they are unlikely to
blow. If, however, they should need replacing, they should only be replaced by qualified service
personel. The appropriate fuse values are indicated on a label next to the fuse holders.
FRONT PANEL
REAR PANEL
CONNECTORS
SWITCHES
Although a D130Z is shown above, all front panel features are identical for the D65Z, D130Z & D250Z except for the model name on the power switch
