Akai LM-H30CJSA, Service Manual

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5) Panel interface
Refer to sheet 6 of PWB-0663 circuit diagrams.
The signals of panel interface are all applied from Scaler
I019 (TP6760) to LCD
Panel through connector P005 and wire P005A . The signals CLK
、
DE
、
V.SYNC
、
H.SYNC from I019 #90,#92~94 are applied to LVDS IC I014 # 31,#30,#28,#27 and
output PCLK-,PCLK+ at #39,#40 .Then , signals are applied to Panel via connector
P005 #7, #6 and used for panel display controls. The 24 bits digital R.G.B.data from
data outputs of I019 (Scaler) are transformed to LVDS signals through I014 and then
applied to 8 bits LCD panel .
+5V for LCD panel is controlled by I019 #96 (FPVCC) via Q003 (MTB3904)
and I027 (MM9933)
6) MCU
Refer to sheet 5 of PWB-0663 circuit diagrams.
* Pin 21 (UCLK): The Microcontroller I012 (Sync.Mos: SM59264C) is operated with
the 14.318 MHz Clock which is provided from Scaler I019 #136 (UCLK) based on
crystal X002 .
* Pin 10 (Reset ) : C127 and R096 constitute a Reset circuit. It provides a necessary
active high reset signal to I012 (MCU) # 10 for proper operation of I012 .
* Pin 15 (IR ) : The signal IR_DA at I012 #15 is connect with Infrared Receiver. If the
IR receives some signal, I012 will send interrupt signal via I012 #2
、
#3 ( MSDA
、
MSCL) to control other chips .
* Pin 36~43 (Data transfer): The signals AD0~ AD7 transferring between
I012 (MCU)and I019 (Scaler) are assigned to I012 #36~#43.
* Pin 11,13 (Debug) : The signals TXD and RXD used for debugging firmware are
assigned to I012 #13
、
11.
I013 (24LC16B) provides necessary non-volatile storage for operating variables
and parameters. It is controlled by I012 via MSDA and MSCL signal, which are pull
up to +5V voltage by R092 and R093 (10K
Ω
).
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