MITSUBISHI ELECTRIC WS-48513 User Manual

Page 46

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4-6

SHORT Detect
The short Detect circuitry is shown in Figure 4-6 and is
the same as in the V19 and V21 chassis. If a short
occurs in the + or – 24V supplies, pin 46 on IC7A00
goes Low indicating a short and the TV shuts Off. With
-24V shorted, the 12VS supply turns Q9A53 On, pull-
ing the SHORT line Low. If +24V is shorted D9A54 is
forward biased and the short line goes Low.

X-RAY Protect
Refer to Figure 4-7, the X-Ray input is at pin 47 of
IC7A00, and is normally High. The X-Ray Protect
circuit monitors:

• Excessive HV
• Excess CRT Beam Current
• Excess HV circuit Current

If any of the preceeding occurs, the X-Ray line goes
Low, and the TV shuts Off.

The monitoring circuits for X-ray Protect are described
in the detail in the Deflection and HV Section. Other
parallel inputs to the µPC, are listed in Table 4-1.

IC7A00 Additional Inputs

Pin #

Name

Source

6

SD-SUB

Sub Tuner Sync Detector

7

SD-MAIN

Main Tuner Sync Detector

62

H-SYNC-IN

ASIC Horizontal Sync

64

V-SYNC-IN

ASIC Vertical Sync

92

AFT1

Main Tuner AFT voltage.

93

AFT2

Sub Tuner AFT voltage

94

VBLK

Deflection Loss Detect circuit

97

CV-IN-SUB

Sub Video (CCD, V-chip,etc)

100

CV-IN-MAIN

Main Video (CCD, V-chip,etc)

Table 4-1: µPC Inputs

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