Additional Inputs And Outputs; Dm Module Control Circuitry - Mitsubishi V19-V21 Tehnical Manual

Name
ANT-A
BLANK-CRT
DVD-SW
IR-IN-BUSY
LED
M-FRUN
MN-SYNC-SW
MUTE-MON
MUTE-SPKR
MUTE-SUB
NT-SW
PON-1
PON-2
POWER GOOD
S-FRUN
SUB-CONTRAST
SUB-SYNC-SW

Additional Inputs and Outputs

There of course specific purpose inputs and output on
the TV µPC. Most of the inputs are status inputs and
the outputs are specific commands. The specific pur-
pose inputs are listed in Table 6-1, and the outputs in
Table 6-2.
In the V19/V21 the Short input at pin 46 of the µPC
only monitors the positive and negative 24 Volt sup-
plies. The Power Good output at pin 82 is normally
Low. If AC is lost, pin 82 goes High.
Name Pin No.
AFT1 92
AFT2 93
AC-OFF 20
H-SYNC 97
DM-DET 26
SD1 7
SD2 6
SHORT 46
V-BLANK 94
VSYNC 95
XRAY 47
Table 6-1: TV µPC Inputs
Pin No. Description
81 Select Ant-A or Ant-B
2 Blanks CRT through CRT Protect Circuitry
53 Selects DVD-1 or DVD-2
43 IR Signal to DM for System 5
4 Front Panel Led Control
83 Main Picture Freerun
24 Main Picture Sync Switch Control
86 Mutes sound from Monitor Outputs
80 Mutes sound from the set's speakers
87 Mutes sound from the Sub Monitor Outputs
51 Selects NTSC Y signal source
50 Power ON command
49 Power On command (signal processing circuits)
82 High = AC Power Loss
84 Sub Picture Freerun
25 Reduces video amplitude during Sub Contrast Adjust.
23 Sub Picture Sync Switch Control
Table 6-2: TV uPC Outputs
Purpose
Main Tuner Tuning
Sub Tuner Tuning
Loss of AC Power
Horizontal Sync
DM connected
Main Tuner Signal Present
Sub Tuner Signal Present
Power Supply Short
Video is blanked
Vertical Sync
Shuts the TV Off

DM Module Control Circuitry

Since the DM Module is considered a replaceable com-
ponent, an in depth circuit description is not required.
Only a simplified overall view is needed.
Figure 6-7 shows a Simplified Overall Block Dia-
gram of the Control Circuitry in the DM Module.
The heart of the Control Circuitry is the DM µPC.
The E2PROM, on the E2P Module, stores most of
the user and service adjustment data.
6-7