6
Two Channel Amplifier
Harman Kardon
SIGNATURE 1.5
OPERATION
The Signature 1.5 may be operated in either a manual or
automatic mode. If the unit is being used in a stand-alone
operation you should follow the instructions below for
Manual Operation. When the Signature 1.5 is connected to
another compatible device such as the Signature 2.0 or
PT2500 tuner, follow the instructions for Automatic
Operation.
Make sure the power switch is in the off position before
plugging in the AC power cord. After all the connections
have been made to the amplifier’s input jacks and speaker
terminals, connect the power cord to an AC outlet. Turn on
your source component and receiver/processor first; start
with a low volume level to protect your speakers.
Manual Operation
The LED indicator should be glowing red if the unit is
plugged in. Press the front panel switch to turn the unit on.
The indicator will flash green briefly, and then go out; the
front panel will then illuminate to blue.
To turn the unit off, press the power switch again. The LED
indicator will return to red.
Automatic Operation
Before proceeding, make certain the connection between
the Signature 2.0, PT2500, or other trigger source has been
connected properly to the unit following the previous
directions. At this point the trigger source should be off.
After all cables are connected and the Signature 1.5 is
plugged in, the LED Indicator should be glowing red. Press
the power switch and the indicator will turn amber indicating
the unit is in the standby mode and ready to turn on when it
receives a signal from the triggering device. Finally, turn on
your Signature 2.0, PT2500, or other trigger source to turn
the Signature 1.5 on.
The indicator will flash green briefly, and then go out; the
front panel will then illuminate to blue.
At the conclusion of your listening session, there is no need
to turn the Signature 1.5 off manually. When the Signature
2.0, PT2500, or other trigger source is turned off, the
Signature 1.5 will return to the standby mode.
Important Note:
If you will not be using your audio
system for an extended period of time, such as a vacation,
we recommend turning the Signature 1.5 off using the
power switch.
IDLE CURRENT ADJUSTMENT FOR SIGNATURE 1.5
Locate test points
P4
and
P5
; these are 2 pin female molex connectors (2 total, 1 per channel) on the MAIN AMPLIFIER PCB
near the speaker terminals.
Attach a DC voltmeter (set to a low range) to these points. This is best accomplished by making up a “test plug” using a male
molex connector that fits into the one in the unit, with wires attached, for connection to the voltmeter. An alternate method is to
use two “mini-grabbers” to attach to the two outer pins on each connection. Warning: Do not accidentally short the two points
together with a meter probe during adjustment.
Adjustment Points: R60, R69
Adjust to 18mv across test points, one channel at a time, until both channels comply.
OUTPUT TRANSISTOR REPLACEMENT ON THE SIGNATURE 1.5
1)
Remove the top cover.
2)
Remove all molex connectors on the main amplifier board.
3)
Remove the (4) outer screws holding the heatsink plate to the chassis.
4)
Remove all outer Philips screws holding both speaker terminals and RCA connectors to the rear panel.
5)
Angle and lift the entire amplifier assembly and heatsink up and out of the chassis.
