SPECIFICATIONS
Product Release No.:
PR 378
(This is not a model number)
Part Number:
120V Version
: 22-2001
240V Aust
: 22-2031
230V UK
: 22-2041
230V
: 22-2061
100V
: 22-2071
Input impedance:
18.2 k
Ω
(@ input jack)
Output impedance
:
1 k
Ω
(@ [preamp] output jack)
Power output:
80 Watts into 4 ohms @ <1% THD
Power Requirements:
100V Version:
100 VAC, 50/60 Hz, 360 W
120V Version:
120 VAC, 60 Hz, 360 W
230V Version:
230 VAC, 50 Hz, 360 W
240V Version:
240 VAC, 50 Hz, 360 W
Speaker Complement:
One 4 Ohm Special Design 12" Speaker (P/N 048878)
Dimensions:
Height:19.6" (39 cm)
Width: 24.5" (57 cm)
Depth: 15.6" (26 cm)
Weight:
55 lbs.
(25.2 kg)
Product specifications are subject to change without notice
CIRCUIT NOTES
POWER FOR DSP CARD
The +5 volts for the
DSP
card is supplied by +5V regulator
U150
(see power amp assembly schematic.)
C157
stores
a voltage that is sufficient (approx. 8.5V) to keep the regulator adequately supplied. Components
D156
and
D157
through
Q150, Q151,
and
Q152
comprise a very efficient synchronous rectifier that keeps
C157
charged. The +5 volts
leaves the supply through cable
H2-5, 6
.
INDEPENDENT TEST OF POWER AMP
One end of jumper
W40
on the preamp board connects directly to
H1-3
,
which carries the preamp output signal to the
power amp. Lift the opposite end of
W40,
and use the liberated end as a point to inject a signal to the power amp.
(Remember to re-connect
W40
after testing.)
SELF - TEST OF DSP MODULE
**********
PLEASE NOTE: THIS MODULE IS ESD SENSITIVE. USE ANTI - STATIC PRECAUTIONS
**********
To initiate self - test of the
DSP
module, short
TP2
to
TP1
while turning power from off to on. Self - test pass is
indicated when the yellow LED remains on continuously. Failure is indicated when the red LED blinks or the yellow
LED fails to light. If a passing condition exists, the module will operate in the loopback mode until the power is cycled
off - on with
TP2
not shorted to
TP1
. In the loopback mode the module's output (at
TP9
and
TP10
) will be a replica of
the input signals (
TP6
and
TP8
).
[See
DSP
service manual;
TP2
is the inboard end of
R14
;
TP1
is ground, and is found on pins
2, 4,
and
6
of
P1
(also,
the chassis)].
TESTING THE PREAMP
Ensure that the
DSP
module is in self - test mode (see above) before testing the preamp section (to avoid errors in
readings - see note 6 on schematic)
2
