Service Adjustments - Sanyo HT28745 Service Manual

GENERAL
This set has an On-screen Service Menu system included in the CPU that allows remote operation for most of the service adjustments.
ON-SCREEN SERVICE MENU SYSTEM
1. Enter the Service Menu:
•
While pressing the – VOLUME key on the front control panel,
reconnect the AC power cord. The Service Menu Display will now
appear. The remote can now be used to make adjustments.
See Figure 1.

2. Service Adjustments:

•
Press the Channel L or M key to select the desired service
menu you want to adjust. See page 5 for On-screen Service
Menu.
•
Use the Volume + or – key or numeric keys to adjust the data.
(For Sub - Address see below)
3. Exit from the Service Menu:
•
Press the MENU key to turn off the Service Menu display.
ADJUSTMENT FOR SUB ITEM (ADDRESS)
Some service data have Sub - Addresses. Use the numeric keys (from 0 to 7), to adjust the Sub - item data.
ADJUST DATA OF SUB-TITLE
1. Find the title and its bit of binary data from Table 1 (On-Screen Service Menu).
(b7) (b6) (b5) (b4) (b3) (b2) (b1) (b0)
0 1 0 1 0 1 1 0
2. Enter the service menu (see above) and select the item number needed with the Channel L or M key.
3. With the numeric key (from 0 to 7), change the bit data. Each time the numeric key is pressed, the data changes from 0 to
1 alternately. For example, to change the data of bit 5, press the "5" key.
NOTE: The L and M symbols used in the following service adjustments refer to the Channel up and down keys not the
Menu keys.
IC802 (EEPROM) REPLACEMENT
When IC802 (EEPROM) is replaced, IC801 (CPU) will automatically write the initial reference data into IC802 for basic TV operation.
However, the bus data should be checked and some bus data should be set up before attempting the service adjustments.
(See Table 1. on pages 5 – 13 for detailed bus data information.)
INITIAL BUS DATA SETUP
Note: When IC802 (EEPROM) is replaced, change the following initial reference data for proper TV operation before
attempting service adjustments.
1. Disconnect the AC power cord (AC 120V line).
2. While pressing the MENU key, reconnect the AC power cord. The Service Menu display will now appear.
3. Select NO. 102 SHU2PO (Sub Hue / Pre/Over Shoot) with L or M key. Adjust the data with number keys for 37.
4. Select NO. 103 SLC2CTI (Sub Color / CTI Level) with L or M key. Adjust the data with number keys for 29.
5. Select NO. 105 SSH2LTI (Sub Sharp / LTI Level) with L or M key. Adjust the data with number keys for 61.
6. Select NO. 109 SBR2GAM (Sub Bright / Gamma) with L or M key. Adjust the data with number keys for 32.
7. Select NO. 10A RCT2LTIM1 (R Cutoff / LTI Mode) with L or M key. Adjust the data with number keys for 84.
8. Select NO. 10B GCT2DPL (G Cutoff / DPic Lev) with L or M key. Adjust the data with number keys for 4D.
9. Select NO. 10C BCT2DCT (B Cutoff / DC Tran) with L or M key. Adjust the data with number keys for 8D.
10. Select NO. 10F CBOF2AW1AB (CB Offset / Aging W / Aging B) with L or M key. Adjust the data with number keys for 9C.
SERVICE ADJUSTMENTS
— 3 —
XXXXXXXXXXX
XX
TITLE
ITEM NO.
Figure 1. Service Menu Display
BINARY DATA
(8 bit)
XX XXXXXXXX
BINARY DATA
(8 bit)
HEXADECIMAL
DATA