Sanyo HT30746, Руководство по обслуживанию

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SERVICE ADJUSTMENTS (Continued)
ANTENNA CONNECTIONS
This receiver is designed for UHF/VHF and Digital RF recep-
tion. A 75 ohm terminal is provided for UHF/VHF reception
and a separate 75 ohm terminal is provided for Digital RF
reception. When connecting a CATV antenna system, con-
nect the 75 ohm coaxial cable directly to the 75 ohm
terminal. For 300 ohm VHF antenna, use an adapter (not
included with the TV set).
CIRCUIT PROTECTION
Fuse F601 (
6
A) is included in the AC line. This fuse must be
replaced with the proper fuse (see Parts List).
+B VOLTAGE CHECK
1. Connect Vol lead to TJ1 (140.5 V) and – lead to
ground (Power/Deflection board).
2. Connect receiver to AC 120V line.
3. Tune receiver to an active channel.
4. Set the picture controls to the Auto level or Reset (use
MENU key and or key or RESET key).
5. Voltage must measure between 139.0 V and 142.0V.
If the voltage is out of range, the power circuit must be
checked. No +B adjustment is provided on this chassis.
HORIZONTAL CENTERING ADJUSTMENT
1. Tune receiver to an active channel.
2. Check that picture is in the horizontal center of TV
screen. If picture is not centered horizontally, perform
steps 3 - 6.
3. Turn off the receiver and disconnect the AC power cord.
(120V AC line)
4. While pressing the VOLUME – key, reconnect the AC
power cord. The Service Menu display will now appear.
5. Select NO. 11F (HPO2: Horizontal Position, Bit 7 - 2) with
or key.
6. Adjust the data with numeric keys for horizontal center. To
turn off the Service Menu display, press the MENU key.
HORIZONTAL WIDTH ADJUSTMENT
1. Tune receiver to an active channel.
2. Check the picture for proper width. If width is not cor-
rect, perform steps 3 - 6.
3. Turn off the receiver and disconnect the AC power cord.
4. While pressing the VOLUME – key, reconnect the AC
power cord. The Service Menu display will now appear.
5. Select NO. 11A (HSI2: Horizontal Size, Bit 7 - 2) with
or key.
6. Adjust the data with numeric keys for proper width. To
turn off the Service Menu display, press the MENU key.
VERTICAL SIZE ADJUSTMENT
1. Tune receiver to an active analog channel.
2. Check the vertical size of the picture. If the vertical size
is too large or small, perform steps 3 ~ 6.
3. Turn off the receiver and disconnect the AC power cord.
4. While pressing the VOLUME – key, reconnect the AC
power cord. The Service Menu display will now appear.
5. Select NO. 117 (VS: Vertical Size, Bit 7 - 2) with or
key.
6. Adjust the data with + or – key for full scan. To turn off
the Service Menu display, press the MENU key.
VERTICAL CENTERING ADJUSTMENT
1. Tune receiver to an active analog channel.
2. Check that picture is in the vertical center of TV screen.
If picture is not centered vertically, perform steps 3 - 6.
3. Turn off the receiver and disconnect the AC power cord.
4. While pressing the VOLUME – key, reconnect the AC
power cord. The Service Menu display will now appear.
5. Select NO. 118 (VPS: Vertical Position) with or key.
6. Adjust the data with numeric key for vertical center. To
turn off the Service Menu display, press the MENU key.
GRAYSCALE ADJUSTMENT
1. Connect a color-bar generator to the analog antenna
terminal.
2. Switch the generator to the white pattern.
3. Set the picture controls to the AUTO level or Reset (use
MENU key and or key or RESET key).
4. Turn off the receiver and disconnect the AC power cord
(120V AC line).
5. While pressing the VOLUME – key, reconnect the AC
power cord. The Service Menu display will now appear.
6. Select the following service menu items with the or
keys and set the data with the numeric keys.
7. Select NO. 107 RD2 (Red Drive) and set data to 7C, NO. 108
GD2 (Green Drive) and set data to 7F, and NO. 109 BD2
(Blue Drive) and set data to 7C.
8. Set NO. 10B RCT2 (Red Cutoff) data to 56, NO. 10C GCT2
(Green Cutoff) data to 1D, and NO. 10D BCT2 (Blue Cutoff)
data to 53.
9. Set NO. 10A SBR2 (Sub Brightness) data to 4F and
NO. 106 SSH2 (Sub Sharpness) data to A3.
Screen Adjustment
10. Connect oscilloscope probe (at least 50:1) to TP47G and
ground lead to TE47 on the CRT socket PWB.
11. Select “Screen Adjustment” Menu NO. 090 with or
key (Black Picture).
12. Adjust Screen Control (T402) to obtain 15 Vp-p from
black to white level. (See Figure 2.)
CAUTION
FOR CONTINUED PROTECTION AGAINST
A RISK OF FIRE, REPLACE ONLY WITH THE
SAME TYPE
6
A, 125V FUSE.
ATTENTION : POUR MAINTENIR LA PRO-
TECTION CONTRE LES RISQUES
D’ INCENDIE UTILISER UN FUSIBLE DE
RECHANGE DE MEME TYPE
6
A, 125V.
6
A 125V
1V
15 Vp-p
Figure 2.