Sherwood RV-4050R Service Manual page 7

2. Key Matrix
3. Block Diagram
KSCAN 0 | KSCAN 1 | KSCAN 2 | KSCAN 3 | KSCAN 4 | KSCANS5 | KSCAN8
PIN 28 PIN 27 PIN 26 PIN 25 PIN 24 PIN 23 PIN 22
KEY INO TUNING
VCR 2 MEMORY
PIN 35
KEY IN 1 SURROUND
TREBLE TV/AUX VCR 2 TAPE
PIN 36 MODE MONITOR
KEY IN 2
ALANCE
PIN 37
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REGISTER
[PROGRAMMABLE = 8 :
4. Pin Functions
| Symbol _| Description
16-51 Segment SON EE NE et Output for FIP.
[Mute signal output ta LOvO94 SSCS
| 18 DOLBY Output for driving DOLBY LED.
| 19 | 3-ST Output for driving 3-STEREO LED.
| 20-21 | NC | Not used! (NC pins are always connected to Vdd).
| 22-28 | | T?~TO __| Grid signal output for FIP.
| 29. | INT _| Data input of Ko~Ks for key scan.
| 30-31 | = NC____|_Notused!
Data input of Ko~Ke for key scan.
| 38 | EVC.MU. _| Mute signal output to prevent click noise when operating electronic VOL.
39/40 VIDIMID2 Control data output for selecting VCR1 or VCR2 video signal.
According to each mode, data output is as follows.
[Mobe [vib | vio2 | REMARKS
Weng etc tes al
Poruers | a | a | ai Previous state
% Last memory function is available.
Emitial settings
| 41 | M.VOL.IN1
42 CH. MODE
input for main volume.
Port for settings of PRO-LOGIC and 3-STEREO mode.
According to each mode, data output is as follows.
OTHERS
rockers =u. SEGMENT ®©-@
| accumuLaTor |
Se
QuT Pur
:
448 | MEMORY Fs
x4 = SEGME NT ®-e
STS eS ID, ouTPUT =
BIT DATA TIMER (8) KS g Se-Stt
MEMORY TIMER COUNTER 8 : el
Ee ee OO SERIAL 1/O (@) 12288 x8 BIT
MEMORY
TIMER
Gaxa [timer |
rene]
DISPLAY MEMOR
96X46 BIT
FL TUBE a EXTAL@)
CONTROLLER
ORIVER xTaL @
- TEX &)
tx ®&
S/O
& Siem ob PORTX frorr + }} {| f |
> %®8O@o -
—w ' Or OO PGPH re og ont S Se 8@
PU,PK OF Reg < 2 zr Sle & @2, >
3 So8 3 32q@ OY®
oO aoa & 2 ¢;@
@@ @O®
Ne) 12
| 43 | NCC Notused!
44 PROT. Signal input for protection.
When "L" is input, it is changed to STAND BY.
(But for first 3 second, PROTECTION Is not checked.)
45 RMC Input for remocon data. (At "L", it is active.)
46 H/P_IN When inserting headphone, "H" is input.
47 D. LINK Input/output for controlling DIGI-LINK.
| 49-50 | CLK/DATA | CLOCK/DATA output for TDA7300, TC9154, LC7821, NJU9701 and LM7001.
51 CE1 Chip enable output for LM7001.
| 52 | _CE2_ _| Chip enable output for TDA7300.
| 53 | CE3 Chip enable output for TC9154. ae
54 CE4 Chip enable output for LC7821.
55 H/P MUTE Output for headphone mute. "H' is outputed under the following conditions.
1. When the power is on or off.
2. When selecting the input function.
3. When "H" is input to H/P input.
4. When "L" is input to "PROT" of CPU.
5. "-co "mute signal is transferred from the commander.
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