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JVC AVN48P74
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of JVC AVN48P74 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 64 (click to view)
AV-N48P74 AV-N56P74

SECTION 4 TROUBLESHOOTING
4.1 SELF CHECK FUNCTIONS ⢠This model has self-check functions that inform of the failure of the TV by detecting abnormality. ⢠Operational state is always monitored and the identified is memorized on the record.

4.1.1 HOW TO ENTER THE SELF-CHECK MODE (1) Set the <SLEEP TIMER 30MIN> with [SLEEP TIMER] key. (Fig.1) (2) During the <SLEEP TIMER 30MIN> display, press [DISPLAY] key and [VIDEO STATUS] key at the same time. (3) Then <TEST MODE> screen is displayed. (Fig.2) (4) Press [ 4 ] key then <SELF-CHECK> screen is appear. (Fig.3)

SLEEP TIMER 30MIN

4.1.2 HOW TO EXIT FROM THE SELF-CHECK MODE (1) By using the remote control unit, turn the power off. At this time, the failure record is cleared. (2) Take off the AC plug from the wall outlet. At this time, the failure record is not cleared.

Fig.1

4.1.3 SELF-CHECK DISPLAY The self-check results are shown on the following display. Method of indication when the raster is not displayed (Fig.3). Each failure is shown by turning POWER LED on and off at specified intervals. Item X-ray protection B1 over-current protection POWER LED ON / OFF intervals Turning on and off 0.1-second intervals Turning on and off 1-second intervals

TEST MODE 1. I2C STOP 2. STATUS DISP. 4. SELF-CHK 5. CONVER OFF ROM CORRECTION : ACT ROM VERSION :
Fig.2

Low B short protection Turning on and off 2-second intervals

4.1.4 EXPLANATION FOR ACTIVATION OF SELF-CHECK FUNCTIONS ⢠For X-ray protection, B1 over-current protection and low B short protection, the power of the TV is turned off if NG is detected. Immediately after the power is turned off, POWER LED will be turning on and off. When the power is turned off, you cannot turn the power on again until the AC plug is taken out and put in again. ⢠The latest failure is stored on the record at the end. The failure record for each check item is counted to the number of 9 at the maximum, When more than 9 failures are stored on the record, the counter remains stopped at 9. ⢠SYNC is neither counted nor stored in memory. ⢠Because of the timing of Vcc start-up and shut-down of the IC connecting to the I2C bus during which the power is turned on and off, the operation may be interpreted as an error. In order to avoid the misinterpretation, the self-check functions should be started at about 3 seconds after the power is turned on.

ITEM

RESULT COUNT

XRAY LOB SYNC MEM VCD AIO TUN PP

NG2 OK M:OK OK NG2 OK OK NG4

OCP TIM S:OK AVSW BS YC GCR IP

NG2 OK HD:NG OK OK OK OK OK

Fig.3 SELF-CHECK SCREEN

1-64 (No.52127)

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