Sub Agc Adjustment; Final Assembly Adjustment; Cut Off Adjustment - Hitachi C43-FD5000 Service Manual

SERVICE ADJUSTMENTS
Adjustment Procedure
(1) Receive ch27 China or ch40 CCIR. (623.25MHz, -50dBm) in service mode.
(2) Select item No.11 in service menu by [▲] or [▼] key.
(3-1) When the value of AGC (NO.11 in service menu) is 235 or less than 235.
(3-1-1) Push [►] key of remote control and set AGC value becomes 235 or greater than 235.
(3-1-2) Push the "MUTE" button of remote control, and then AGC adjustment is completed.
(3-2) When the value of AGC (NO.11 in service menu) is 235 or greater than 235.
(3-2-1) Set the value of AGC by [◄] key of remote control to smaller than 235.
(3-2-2) Then push [►] key of remote control and set the AGC value again to greater than and as close as 235.
(3-2-3) Push the "MUTE" button of remote control, and then AGC adjustment is completed.

1.3 SUB AGC ADJUSTMENT

Adjustment Preparation
(1) To prevent circuit temperature drift, the set must be warmed up before alignment longer than 10 minutes.
(2) Check the RF signal frequency and level accuracy. (e.g. 623.25MHz, -50dBm)
Adjustment Procedure
(1) Press [PIP] button to display sub picture, and receive the signal, ch27 China or ch40 CCIR (623.25MHz,
-50dBm) in adjustment mode.
(2) Select item No.12 in service menu by [▲] or [▼] key.
(3-1) When the value of AGC (NO.12 in service menu) is 235 or less than 235.
(3-1-1) Push [►] key of remote control and set AGC value becomes 235 or greater than 235.
(3-1-2) Push the "MUTE" button of remote control, and then AGC adjustment is completed.
(3-2) When the value of AGC (NO.12 in service menu) is 235 or greater than 235.
(3-2-1) Set the value of AGC by [◄] key of remote control to smaller than 235.
(3-2-2) Then push [►] key of remote control and set the AGC value again to greater than and as close as 235.
(3-2-3) Push the "MUTE" button of remote control, and then SUB AGC adjustment is completed.

2. FINAL ASSEMBLY ADJUSTMENT

2.1 CUT OFF ADJUSTMENT

Adjustment Preparation
(1) Pre-set (turn counterclockwise to the end) the screen VR (R, G and B) on FOCUS PACK. Then pre-heat the
set.
(2) Confirm item No. 47、 48 and 49 are set to 127 in service menu.
No. V0XX
11 34 235
12 54 234
13 64
14 32
Value of AGC
13