Sherwood RV-4050R Service Manual page 8

Symbol
MAIN MUTE
Description
Output for main mute. "H" is outputed under the following conditions.
1. When the power is on or off.
2. When "H" is inputted to H/P input.
3. When °L" is inputed to "PROT" of CPU.
4. "-co " mute signal is transferred from the commander.
Output for SURR. mute. "H" is outputed under the following conditions.
1. When the power is on or off.
2. When selecting surround mode.
3. When the test tone mode is on or off or When the channel is
change in the test tone mode.
4. When °H" is inputed to H/P input.
5. When °L° is inputed to "PROT" of CPU.
6.*-c " mute signal is transferred from the commander.
Output for center mute. "H" is outputed under the following conditions.
1. When the power is on or off.
2. When the center mode is on or off.
3. When selecting center mode.
4, When the test tone mode is on or off or When the channel is
change in the test tone mode.
5. When "L" is inputed to "PROT" of CPU.
6, "-co _" mute signal is transferred from the commander.
Output for controlling in the surround mode.
- SURROUND MODE PRO 1
PRO-LOGIC, 3-STEREO
SURR. OFF L
| 60 | _CE5__| Chip enable output for NJU9701.
| 61 | PD __| Input for power down. (At "L', it is active.)
62
M. VOL. IN2 Input for main volume up/down.
57 SURR. MUTE
58 CENTER MUTE
59 PRO
VOL. DOWN VOL UP
ea Sine
IN2
~
STEREO input for lighting the "STEREO" Indicator. {At "L", it is active.)
TUNED input for detecting station during tuning.
If "L" is inputed during tuning, tuning stops at that frequency.
14
[ Pin.No. | Symbot___| Description
ASTEP/F.STEP | According to region, input for selecting the frequency bands and steps
of FM and AM.
Setting are as follows.
| REGION | FREQUENCY STEPS
AMERICA | FM: 87.5~107.9 MHZ
AM: 520-1710 kHz
EUROPE | FM: 87.5~108 MHz
AM: 522~1611 kHz
KOREA FM: 87.5~107.5 MHz | 200 kHz
AM: 522~1611 kHz 9 kHz
T.MUTE Output for tuner mute.
Output for driving STAND BY LED. (At "H', it is active).
69/70
CM1/CM2 Contro! data output for center mode in the DOLBY PRO-LOGIC and
3-STEREO mode.
Setting are as follows.
we a
This pin prevides the ground potential.
Output pin serve for connecting a clock oscillator crystal.
7 Vss
XTAL
~
NS
73 | NC Not used !
74 EXTAL Input pin serve for connecting a clock oscillator crystal.
NC
Vieo This is the power supply pin of the FL controller.
NS3~NS1 Control data output for selecting channel in the test tone mode.
says
77~79
Setting are as follows.
SELECTION NS1 NS2 NS3
TEST TONE OFF
4 : previous state
STAND BY When the power is on, control data output is "H".
When the power is off, contro! data output is "L".
{and last memory function is activated.)
18