¶ Rough diagram of switching between SR+ and RS-232C
¶ How to switch from SR+ to RS-232C
For the PDP-434HD and -504HD series Plasma Displays, the circuitry is structured as shown in the diagram below to support
the SR+ system. Controlling with either the SR+ system or RS-232C commands can be selected. As the SR+ system is
selected at shipment, to control with RS-232C commands in servicing it is necessary to switch the paths. After servicing, be
sure to return the setting to the SR+ system.
232C (DSUB_9P)
TXD (EXT), RXD (EXT)
SR_EN_B
SR+ (SR out)
232C
Driver
IC9702
(IF Microcomputer)
SR+
Interface
SR Assy AV BOARD Assy
Remote control unit
Media Receiver
PC
RS-232C
START
INFORMATION
VERSION
INITIALIZE
SYNC DET
MUTE
Up
Down
Select INITIALIZE mode
INITIALIZE
UART SELCT
Select UART
Enter the Service Factory mode
SR+ → 232C / 232C → SR+
Send the command "BR0"
Command "BR0"
Left Right
INITIALIZE
UART
Select SR+ / 232C
SR+ ↔ 232C
PC
START
INFORMATION
VERSION
Enter the Service Factory mode
(See "6.7 SERVICE FACTORY MODE".)
232C → SR+ only
Tips: How to change the SR+/RS-232C setting without entering Service Factory mode
Hold the VOLUME or key on the remote control unit pressed for 3-10 seconds during Standby mode.
Then within 3 seconds after the key is released, hold the 2-screen key on the remote control unit pressed for 3-10 seconds.
Then within 3 seconds after the key is released, use the SET key on the remote control unit to set to RS-232C (the baud rate
last selected is chosen) or the HOME MENU key to set to SR+.
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