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Service mode (electronic controls)
This receiver has electronic technology using the I²C
bus concept. It performs as a control function and it
replaces many mechanical controls. Instead of
adjusting mechanical controls individually, many of the
control functions are now performed by using “on
screen display menu”. (The service adjustment
mode).
Note: It is suggested that the technician
reads all the way through and
understand the following procedure for
entering/exiting the service
adjustment mode; then proceed with
the instructions working with the
receiver. When becoming familiar with
the procedure, the flow chart for
servicemodemaybeusedasaquick
guide.
Quick entry to service mode:
When minor adjustments need to be done to the
electronic controls, the method of entering the service
mode without removal of the cabinet back is as follows
using the remote control:
1. Select SET-UP icon and select CABLE mode.
2. Select TIMER icon and set SLEEP time for 30 Min.
3. Press “ACTION” twice to exit menus.
4. Tune to the channel 124.
5. Adjust VOLUME to minimum (0).
6. Press VOL (decrease) on receiver.Red“CHK”
appears in upper corner.+
Note: After receiver is set into service mode,
set TIMER back to NO.
7. Press POWER on the remote control to display
the service adjustment modes menu, select
adjustment by pressing the volume right/left
buttons and channel up/down buttons on the
remote and ACTION to enter the adjustment.
Exiting the service mode:
This TV goes out from service mode when it is
unplugged or turned OFF. To exit the service mode,
turn the TV OFF or unplug the TV from AC.
Other method
Press ACTION and POWER on the receiver
simultaneously for at least 2 seconds.
The receiver momentarily shuts off; then comes back
on tuned to channel 3 with a preset level of sound.
Any programmed channels, channels caption data and
some others user defined settings will be erased when
exited by pressing ACTION and POWER on receiver.
To check colors:
Press RECALL on the remote control when in service
mode (red “CHK” is displayed) to enter the purity field
check mode.
To toggle between aging and service
modes:
While the “CHK” is displayed on the left top corner
oftheCRT,pressing“ACTION”and“VOL”uponthe
TV simultaneously will toggle between the modes.
Red “CHK” for service and yellow “CHK” for aging.
Helpful hints
Entering service mode (open-back method)
• While the receiver is connected and operating in
normal mode, momentarily short test point
FA1(A15pin2)to cold ground ( ) (A-Board).
The receiver enters the aging mode
.
Yellow letters “CHK” appear in the upper left corner of
the screen.
(The VOLUME up/down will adjust rapidly).
Note: When entering using this method, the only
waytogooutofservicemodeistopress
ACTION and POWER on the receiver
simultaneously for at least 2 seconds.
MTS MTSIN SEPAL SEPAH
CLOCK CLOCK HHSTH
VIDEO COLOR BRIGHTINT CONT
B-Y_G CUT_G CUT_R CUT_B
BRT R-DR B-DR
PIP PCONT
HDEF
FINE
H-POS H-WID PCC
PCCHG PCCLG PCCHS PCCLS
TOPG BTMG
TOPSL BTMSL
TRAP
SIDE HTRAP
VDEF VRAS VEAMP V-C
VPOS
V-S
DAF
CTEMP
HDAFS
WARMR WARMB COOLR COOLB
VDAFG
Figure 20. Service mode menu adjustments.
IMPORTANT NOTE:
Always check that the TV exits the
service mode.
Press RECALL again to select desired field.
NORMAL
SCREEN
WHITE
SCREEN
RED
SCREEN
GRN.
SCREEN
BLUE
SCREEN
Figure 21. Purity check field mode.
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