Black Box DV900 Service Manual download pdf (Page 88)

XV-DV99

1234

7.1.8 TROUBLE SHOOTING

Microcomputer Section (CONTROL Assy : IC5501)

Symptom Possible Cause Check Method

• The unit cannot be turned on.

The microcomputer was not reset.

Check if the level of the terminal XRESET (Pin 8) is "H."

If it is not, check the RESET circuit.

The AC pulse is not input.

Check if the AC pulse is input to Pin 4 of the AC input

terminal. If it is not, check the AC pulse generation circuit.

The oscillation circuit of the microcomputer

does not function.

The microcomputer or the oscillation circuit is broken.

Change the microcomputer or the oscillation circuit.

The unit shuts itself off soon after it is

turned on.

• If the Function is DVD, the voltage of the

VDET input (Pin 17) is either 0.5 Vdd* or

less or 0.85 Vdd* or more.

• The voltage of the PROTECT input

(Pin 22) is 0.71 Vdd* or less.

If the voltage at Pin 17 of the VDET terminal of the

microcomputer is either 0.5 Vdd or less or 0.85 Vdd or

more, adjust so that it stays between 0.5 and 0.85 Vdd.

• DVD does not operate at all.

• Time is not displayed in LCD display

during DVD function.

Communication with the DVD

microcomputer has not been established.

• Check that the terminal (Pins 23-25, 29, and 30) for

communication with the DVD microcomputer is live,

and if it is not, check if the flexible cable is

disconnected.

• Check if an "H" signal is output to Pin 93 of the

XDVDRST terminal.

All operation keys are disabled.

The unit recognizes that an operation key

has already been pressed.

If no operation key has been pressed, check if the

voltage at Pins 18 of the KEY input terminal is 5 V. If it is

not, check if the operation switch on the line is in failure.

* Vdd= Approx. 5V (depending on the unit)

ex.) 0.85Vdd= 0.85 × 5 (V)

= 4.25 (V)

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Black Box DV900 Service Manual Page 88

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