Alignment - Toshiba 28H14D Serviceanleitung

Alignment

All adjustment controls not mentioned in this description are adjusted during production and must not be re-adjusted in the case of repairs.
Call up the Service Menu:
Call up the dialogue line:
Changing the setting in the dialogue line: Buttons " " or " " –> "OK"
Back to previous menu:
Exit menu:
Service menu for retailer (code number) "8500"
Measuring instruments: 100MHz oscilloscope with 10:1 test probe, digital voltmeter, colour test pattern generator
Checks and adjustments after replacement or repair of:
- Chassis: alignment 1
- Signal module: alignment 2
- CIC31010 (signal module): alignment 2, 15
- PIP/signal module: alignment 3, 4
- CIC80230 (feature module): alignment 5...11
- Horizontal deflection: alignment 12, 13, (14)
Alignment
1. +A voltage It is absolutely necessary to check and re-adjust these
voltages if necessary after every repair and before
every alignment.
Digital voltmeter: D61516 / cathode
Brightness:
2. Tuner AGC Connect the 100MHz oscilloscope to the tuner contact 10
(signal module) or 11 and to tuner ground.
Feed in a test pattern (sound carrier switched off) via the
aerial, 70...80dBµV.
Call up the "AGC setting" menu via "Info-Center" –> "Instal-
lation" –> "Dealer service menu" –> "8500" –> "Special
functions".
3. Tuner AGC/PIP Connect the 100MHz oscilloscope to the tuner contact 10
(PIP/signal or 11 and to tuner ground.
module) Feed in a test pattern (with sound carrier switched off) via
the aerial, 70...80dBµV.
Display a PIP picture.
4. PLL demodu- Feed in a transmitter signal with standard channel spacing,
lator circuit for Band 1 (B/G).
38.9MHz Tune the set to a transmitter with "00" finetuning.
picture carrier Display a PIP picture.
(PIP/signal Voltmeter:
module)
Voltmeter:
PLL demodu- Feed in a transmitter signal with standard channel spacing,
lator circuit for Band 1 (L`).
33.4MHz Tune the set to a transmitter with "00" finetuning.
picture carrier Display a PIP picture.
(PIP/signal Voltmeter:
module)
Voltmeter:
5. Colour match Call up the "Colour match" menu via "Info-Center" –>
"Installation" –> "Additional settings" (to page 2).
6. Channel position- Call up the "Noise reduction" menu via "Info-Center" –>
related noise "Settings" –> "Picture" (to page 2).
reduction
Programme
positions Call up the "Noise reduction P. 1...199" menu via "Info-
1...199 Center" –> "Installation" –> "Additional settings".
7. Picture Call up the "Picture sharpness P. 1...199" menu via
sharpness "Info-Center" –> "Installation" –> "Additional settings".
2 - 3
Button "i" (Info-Center)
Buttons "P+" or "P-" –> "OK"
"Blue" button
"i" button
Preparations
Minimum
IC32110-22.
IC32110-11.
IC32110-22.
IC32110-11.
Alignment procedure
Use the R61508 control to adjust 135V.
Set to 300-350mV .
pp
Use the RV R32122 control to set 300-350mV
PIP/signal module.
Determine the exact operating voltage UB.
Set half the operating voltage UB/2 with F32085 on the
PIP/signal module (2950421204).
Determine the exact operating voltage UB.
Adjust half the operating voltage UB/2 with R32334 on
the PIP/signal module (2950421204).
Optimize existing run time differences between the Y and
chroma signals. The channel positions 1...199 are
optimized at the same time.
Set the noise reduction ("off", "low", "automatic", "high") for
every channel position.
Set the noise reduction ("manual", "off", "low", "automatic")
for the channel positions 1...199 at the same time.
Adjust picture for best sharpness ("manual" or "0...3").
The channel positions 1...199 are adjusted at the same
time.
on the
pp