Monday, June 17, 2013

ONIDA 14XS / 20XS / 21IQ, 14TVE / 20TVE / 21TVE, 21BLACK FGL (FTG) - SERVICE MODE



SERVICE MODE
  • The following display comes on the screen by pressing DISPLAY key and VSM key at the same time.
FACTORY
SERVICE  MODE
  • Then, press CURSOR UP OR DOWN key to be in Service menu.
  • To select Service Menu parameters use CURSOR UP OR DOWN key and to adjust these parameters use CURSOR LEFT OR RIGHT key.
H-LINE
  • To get H-line press VSM and DISPLAY Simultaneously.
  • Press CURSOR UP KEY to get R CUTOFF.
  • Press '0' to get H-line.
  • To come out of H-line again press '0'.
VSM PRESET.
There are FOUR VSM PRESETS.(CARTOON,FILM/POP,NEWS,)
For the setting of individual VSM PRESETS
  • Press VSM and DISPLAY at the same time.
  • Press CURSOR DOWN key to get the Setting for the VSM PRESET.
  • Press CURSOR DOWN key for the selection of each parameter.
  • Use CURSOR LEFT/RIGHT key for their setting as per the table given below.
  • Press VSM Key for selection of VSM PRESETS.
CLICK ON TABLES TO ZOOM
VCO Adjustment
  • Switch ON the TV Set.
  • Select colour bar pattern {carrier frequency of 38.9MHz} from pattern generator.
  • Connect this signal to the input of Saw Filter(after disconnecting IF output of Tuner)
  • Connect Digital Multimeter to AFC out(pin no. 2 of VCD IC52771, IC201)
  • Adjust VCO coil in such a way that Digital Multimeter shows 4V(sudden change in voltage reading from8V).  This voltage should be adjusted whenever there is sudden fall from8V to 1V.
 Use non-metallic adjustment tool (eg~ceramic) for adjustment.
#  Correct AFT voltage alignment can be confirmed by monitoring proper wave format pin no. 38 of VCDIC 52771 IC no. 201./CRO can be also connected to Video OUT terminal.
Low light Adjustment
Warm up the receiver for more than 30 minutes.
  • Receive the monoscope pattern signal .
  • Select either R CUTOFF , G CUTOFF  B CUTOFF in the Service menu.
  • Push 0 key on any mode to make a horizontal line.
  • Turn the screen knob (the Bottom of FBT) gradually from fully left to the right & search for the first appearing colour.
  • Adjust two colours except for the first colour which appears by the adjustment 5) to the white colour with the following 1~ 6 key.
  • Turn the screen knob so that a horizontal line appear slightly.
  • Change the normal screen by pushing 0 key again.
  • Receive the pedestal pattern signal
  • Readjust the Colour of the pattern to white colour by varying 1~ 6
High light Adjustment.
Warm up the receiver for more than 30 minutes.
The low light adjustment should be done in advance.
  • Receive the monoscope pattern signal .
  • Select R-DRIVE &/OR B DRIVE in the Service Menu.
  • Adjust R-DRIVE& B-DRIVE so that the white balance is at the directed value (Adjustment point “A”).
  • Check if the tracking of white balance from Low light till High light is good.
  • Receive the pedestal pattern signal .
  • Check if the white balance of low light is good. If the white balance of the low light is not good, adjust the low light again.
  • Receive the monoscope pattern signal. Repeat step (4) onwards till perfect white balance is achieved in low light and high light patterns.
Bright Adjustment
  • Receive the Black pedestal pattern signal .
  • Select Sub Bright in the Service Menu.
  • Adjust the Sub Bright so that the point of below table gradation value does not shine.
Note : While entering in Service Menu ,by default it takes the values of VSM cartoon, hence the above parameter is adjusted with respect to cartoon condition.
Contrast Adjustment
  • Receive the Black pedestal pattern signal.
  • Connect the probe of the oscilloscope to green cathode.
  • Select   Sub Contrast in the Service Menu.
  • Adjust it so that the value between the dot line & white peak of the signal waveform as mentioned below to be the directed voltage as mentioned in the Table below.
Note : While entering in Service Menu ,by default it takes the values of VSM-cartoon, hence the above parameter is adjusted with respect to cartoon condition.
Colour Adjustment (PAL)
  • Receive the PAL colour bar pattern signal .
  • Connect the probe of the oscilloscope to green cathode.
  • Select Sub color in the Service Menu.
  • Adjust the Sub color so that the value between the white peak & blue as per below table.
Note: While entering in the SERVICE MENU by default it takes the value of VSM cartoon, hence the above parameter is adjusted with respect to cartoon condition.
Colour Tint Adjustment (NTSC3.58,NTSC4.43)
  • Connect the NTSC Video Colour bar pattern signal    (White 75%) to Video input Terminal.
  • Connect the probe of the oscilloscope to BLUE CATHODE.
  • Adjust the  Sub Tint so that the value between the white peak and Magenta is as per the table shown below.
Note: While entering in the SERVICE MENU by default it takes the value of VSM cartoon, hence the above parameter is adjusted with respect to cartoon condition.