Specifications - Sherwood RV-4050R Service Manual

SAFELY PHEULAYU LIVINDS
WARNING
Before servicing this unit, familiarize yourself with the following precautions: -
1.
N
Many electrical and mechanical parts in this
chassis have special safety characteristics that
often pass unnoticed and the protection
afforded by them cannot necessarily be
obtained by using replacement components
rated for higher voltge, wattage, etc.
Replacement parts that have these special
safety characteristics are identified in this
manual and its supplements: electrical
components having such features are
identified by -t. in the schematic diagram
and the parts list.
Before replacing any of these components,
read the parts list in this manual carefully. The
use of substitute replacement parts that do
not have the same safety characteristics as
specified in the parts list may create shock,
fire, or other hazards.
. Before returning the set to the customer,
always do an AC teakage current check on the
exposed metal parts of the cabinet, such as
terminals, screw heads, and metal overlays,
to be sure the set is safe to operate danger of
electrical shock. Plug the AC line cord directly
into a 120 V AC outlet (120 V AC version only).
(Do not use a line isolation transformer
during this check.) Be sure your AC voltmeter
has a sensitivity of 5000 <2 per volt or greater.
Then connect a 1500 {2 10 watt resistor,
paralleled by a 0.15 pF 150 V AC capacitor,
between a known good earth ground (such as
a water pipe, or conduit) and the exposed
metalic is parts, one at a time. Measure the
AC voltage across the combination of a 1500
Q2 resistor and a 0.15 pF capacitor. Reverse the
AC plug at the AC outlet and repeat AC
voltage measurements for each exposed
metalic part. Voltage measured must not
exceed 0.75V RMS. This corresponds to 0.2
mA AC. Any value exceeding this limit:
constitutes a potential shock hazard and must
be corrected immediately.
At 5000 2 per voit or greater sensitivity ,
the reading should not exceed 0.75 V.
AC Voltmeter
Good earth ground, such as
@ water pipe or Conduit.
0.15 ~F 1S0V AC
Place the probe on each exposed metalic part.
,| Audio Section-Front(Mode : Dolby-logic)
SPECIFICATIONS
Audio Section-Front (Mode: Normal)
RMS output power :
at distortion below 0.3 % 50 Hz
both channels driven at 8 Q
at distortion below 0.3 % 1 kHz
both channels driven at 8 Q
inter-modulation distortion
at 80 W output 60 Hz: 7 kHz =4: 1 SMPTE
Harmonic distortion at 45 W output : 40 Hz
1 kHz
20 kHz
Frequency response at AUX
8 Q load, 1 W output 20 Hz - 40 kHz
Input sensitivity for 50 W output : CD/AUX
Tone control BASS, 100 Hz
TREBLE 10 kHz
Channel separation with 4.7 kQ shorted
at AUX input 1 kHz
10 kHz
Signal to noise ratio, input shorted
with IHF-A
CD, TV/AUX,
TAPE(MONI)
Signal to noise ratio, input shorted
with IHF "A* (Dolby prologic, 3 Stereo)
Frequency response 8 Q load, 1 watt output
at -3 dB (Dolby prologic)
Audio Section-Center
40~20000 50~20000
RMS output power at distortion below 0.9% 1 kHz, 8 2
Signal to noise ratio, input shorted
at -3 dB (Dolby proiogic) [Wide | Hz
Audio Section-Rear =
100-17000
Signal to noise ratio input shorted
with IHF °A* (Dolby prologic)
Delay 20 ms
Frequency response 8 Q toad, 1 watt output