Akai LM-H17CLSA, Service Manual, Page: 28 / 54

5) Panel interface
Refer to sheet 6 of PWB-0579 circuit diagrams.
The signals of panel interface are all applied from Scaler
I019 (TP6760) to LCD
Panel through connector P018
、
P019 and wire PA18 . The signals SHFCLK
、
PDE
、
PVYSNC
、
PHSYNC from I019 #90~94 are applied to LCD panel via connector P018 .
These four signals are used for panel display controls. The 36 bits digital R.G.B.data
from
data outputs of I019 (Scaler) are allotted to even and odd connectors and then
applied to 6 bits LCD panel .
+5V for LCD panel is controlled by I019 #96 (FPVCC) via Q003 (MTB3904)
and I025 (MM9933)
6) MCU
Refer to sheet 5 of PWB-0579 circuit diagrams.
* Pin 136 (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
assign 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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