Tuner Agc Alignment; Dcxo Alignment; Pw1306 Service Menu - Hitachi 15LD2200 Service Manual

Name:
No:
LCD-CON-AV1S
170
LCD-CON-AV2
171
LCD-CON-AV2S
172
RBL
173
EGL
174
LPG
175
PGR
176
PGG-CVBS
177
PGG-RGB
178
PGB
179

Tuner AGC Alignment

4.1.2.
In this part, tuner AGC alignment procedure is described.
A TV pattern generator with RF output and volt-meter are needed for this alignment.
Test Set-up
"NICAM Stereo" and 60 dB PAL B/G RF signal from pattern generator will be applied.
Frequency must be set to 224.25 MHz.
• Turn on the TV and measure the AGC voltage from Tuner Pin1 without plugging in any
RF input (Around 4.12V).
• Apply "NICAM Stereo" and 60 dB(1 mV) PAL B/G RF signal to the tuner input.
• Enter UOC service menu (as described above), and go to "AGC
pressing
"1" "1" "8"
• Measure AGC voltage from Tuner Pin1. By pressing Volume +/-; adjust AGC voltage so
that the measured value at this step should be 0,5V less than the value measured at first
step (Around 3.5V).

DCXO Alignment

4.1.3.
If this alignment has not properly been done, some front end RF problems can be observed such
as Nicam stereo / mono sound switching, low RF reception and color separation performance.
Test Set-up
This alignment will be performed just after Tuner AGC Alignment. Apply "NICAM Stereo" and 60
dB PAL B/G RF signal from pattern generator. Frequency must be set to 224.25 MHz.
• Turn on the TV.
• Enter UOC service menu (as described above), and go to "DCXO Auto" setting.
• Set "DCXO Auto" value to "1" by pressing "Volume +".
• TV will automatically align the DCXO (Digital Controlled Xtal Oscillator) value.
• Then TV automatically re-sets "DCXO Auto" value to "0". This indicates that DCXO
Alignment successfully completed.

4.2. PW1306 Service Menu

• In order to work with PW service menu:
• Press "Menu" (M) and "4" "7" "2" "6" buttons of RC respectively.
• Make the desired settings.
• Press "Menu" (M) from RC to turn off the PW Service menu
• The menu has the following structure:
15" TFT TV Service Manual
AV CVBS contrast adjust.
S-Video input contrast adjust.
UOC Red Contrast
UOC Green Contrast for CVBS input
UOC Green Contrast for RGB input
UOC Blue Contrast
.
Function:
37
Group:
Default:
Sub System 32
Sub System 32
Sub System 32
Sub System 0
Sub System 0
Sub System 1
Sub System 32
Sub System 32
Sub System 34
Sub System 32
setting by
Take over"