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13 . THE DISPLAY DOES NOT APPEAR ON EXTERNAL DISPLAY (IN 65K COLOR MODE).
Does the display appear on Main Display?
Is External Display On/Off setting set to On?
Is External Display unit fully inserted to CN703?
Clean the contact point of the connector CN703 and insert the
unit again. Does the display appear?
Is 3 ± 0.1 V applied to CN703 pin 9?
Is R723 good in appearance and mounted properly?
Are CN701 and CN103 good in appearance and mounted
properly?
Is 3.0 ± 0.1 V supplied from LCD_RST (CN703 pin 27 and
C751)?
Is R222 good in appearance and mounted properly?
Are C755, C756, and C757 good in appearance and mounted
properly?
Is electric potential normal at both ends of C755, C756, and
C757? Are rectangular waves sent?
C755: rectangular wave of approx. 3 V
C756: rectangular wave of approx. 6 V
C757: rectangular wave of approx. 9 V
Is approx. 11.8 V applied to CN703 pin 7 (TP717)?
Are the following voltages applied to V0 - V4?
V0 (C744): approx. 8.56 V
V1 (C745): approx. 7.33 V
V2 (C747): approx. 6.11 V
V3 (C748): approx. 2.42 V
V4 (C750): approx. 1.20 V
External Display unit is defective.
CONFIDENTIAL
YES
YES
YES
NO
YES
YES
YES
YES
YES
YES
TM200 1ADJUSTMENTS, PERFORMANCE CHECK, AND FIRMWARE UPGRADE
NO
Go to the section "Power is not turned on."
Go to the setting as follows and set it to On:
Settings
Phone
NO
Settings
External
Display
Display On/Off
NO
Improperly inserted to the connector.
The contact point of the connector is dirty.
YES
R723 is defective or mounted improperly.
NO
CN703 and CN103 are defective or mounted improperly. And
NO
FPC is defective.
IC704, C736, C751, and R749 are defective or mounted
NO
improperly.
NO
R222 is defective or mounted improperly.
C755, C756, C757, and CN703 are defective, or External Dis-
play unit is defective.
NO
C744, C745, C747, C748, C750, CN703, and IC704 are
defective. The control signal line to IC704 or External Display
unit is defective.
NO
* After a period of time the back light turns off, the voltage on TP717 decreases
to approx. 9 V.
2 – 38
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