Aiwa TV-CN202, Service Manual, Page: 31 / 33

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1. How To Activate /Release Service Mode
<JIG remote control unit>
JIG remote control unit to operate the service mode should be
used with the remote control unit for RC-6VT03 (86-LBR-951-
010) or 86-6VT07 (86-LBP-951-010).
Test mode is activated by pressing TEST key (Hidden Key under
the label). (Refer to Fig.1).
When the Test Mode is activated, below menu (refer to Fig.2)
will be appeared and turn on and off at one second interval.
Jig Remote Controller
(1)
Remove label of jig remote controller.
(2) Cut label of two hidden keys (Finish and Test) into
button size.
(3) Place two timer buttons on the two hidden keys.
(4) Place label back after above steps.
1 Release the function of Auto Power OFF.
It releases the function of Auto Power OFF when no input
occurs.
It is used for warming up (Aging) of CRT Adjustment.
2
Display of AFT S curb.
It displays OK, UP, DN in the status of AFT S curb.
(Observe the Voltage of IC301 Pin47)
3
Display the product hours of CRT ON.
It product hours of CRT ON at one hour interval count up by
(HEX).
Display is 4 digits in HEX.
The product hours is connected to the decimal scale number
from the displayed number.
Fig. 4
UP ··· Higher than normal
OK ··· Normal
DN ··· Lower than normal
AFT
S curb.
When it exceeds 7FFF H (32768 hours), it will reflect to 0000
H again.
Display “1 2 3 4”
1
✕
16
3
+ 2
✕
16
2
+ 3
✕
16
1
+ 4
✕
16
0
= 4660 Hours
(Example)
Fig. 1
2. Content of Service Mode.
Test mode have the following functions.
1 Function for releasing Auto Power OFF.
2
Display AFT S curb status.
3
Display the product Hours of CRT ON.
1 AGING
2
AFT OK
3 0000H
Fig. 3
1 2 3
4 5 6
7 8 9
10 11 12
TEST KEY
(hidden key
under label) FINISH KEY
(hidden key
under label)
DISPLAY KEY
AGING
AFT OK 0000H
Fig. 2
Test mode is released by pressing TEST KEY again.
Precautions to replace EEPROM
When replacing the EEPROM (IC3, AT93C46-10PI), be
certain to follow the sequence appearing below to carry out
initialization.
1. Press “ TEST ” key (hidden key) on the remote control unit to
activate the Service Mode. (Refer to Fig. 1)
2. Press “ DISPLAY ” key on the remote control unit and verify that
the screen is the same as in Fig. 2.
3. Press “ CHANNEL
k i
” key and move the red cursor to S2
position.
4. Press “ –” key, and display data appears as below.
5. With conditions as they are in step 4, press the “DISPLAY” key
and then press the “FINISH key (hidden key)”. (refer to Fig. 1)
6. Following the display of “INITIAL” on the screen for a few
seconds, the power will automatically go off.
Fig. 1
Jig Remote Controller
Fig. 2
1 2 3
4 5 6
7 8 9
10 11 12
TEST KEY
(hidden key
under label) FINISH KEY
(hidden key
under label)
DISPLAY
S1 S2 M 1 2 3 4 5 6 7 8
0 0 1 0 1 0 0 0 0 1 1
S1 S2 M 1 2 3 4 5 6 7 8
0 1 0 1 1 1 1 0 1 0 1
( )
Red
▼
Red cursor
▼