Philips LX9000R Service Manual page 219

Front µP → CECO
reset-ceco
Key board left → Front µP
RotarySA
Key board left → Front µP
RotarySB
Key board right → Front µP
RotaryVA
Key board right → Front µP
RotaryVB
SCART_WAKEUP 7403 ("WU" on AV board) → Front µP (via ASP board)
SDA_CECO Front µP ´ 7804 CECO (via AV board)
7804 CECO → Front µP (via AV board)
SCL_CECO
ASP board junction 3643/3644 → 3612, 3635 (ASP board)
S_REF
SET_FAN_CTRL jct. 3516/3519/3520 (Front/Control) → 7219 (Power second.) via
ASP board
Front µP → 3519
SetFan1
Front µP → 3520
SetFan2
STBY -
CECO ("STBY") → Front µP (via AV- and ASP board)
STBY_CTRL
Front µP → _300__Power Amplifier board)
SUR_ON
3422 → 1302 (Power Amplifier board) → ASP board
TEMP
Front µP → Audio Tuner (via ASP board)
TU_CE
Front µP → Audio Tuner (via ASP board)
TU_CLOCK
Front µP → Audio Tuner (via ASP board)
TU_DI
Audio Tuner → RDS decoder on Front/Control board (via ASP board)
TU_RDS
TU_LEFT (RIGHT) Audio Tuner → ASP board 1606
RDS decoder IC 7407 → Front µP
TuRdsClk
RDS decoder IC 7407 → Front µP
TuRdsData
Audio Tuner → Front µP (via ASP board)
TU_SD
Audio Tuner → Front µP (via ASP board)
TU-stereo
ASP board 7501 → ASP board 3666
XHIGHPASS_OFF
ASP board 7604 → ASP board 2652 (2653)
XLINE_L (R)
ASP board 7514 → ASP board 3620, 3670
XMUTE_ALL
Circuit-, IC descriptions and list of abbreviations LX9000R
Control line, resets the CECO after startup to enable simulation
of key combinations for service tests. Low level=reset
Control line A, rotary encoder "Source"
Control line B, rotary encoder "Source"
Control line A, rotary encoder "Volume"
Control line B, rotary encoder "Volume"
provisional only
I2C bus Serial Data, communication CECO - Front µP
I2C bus Serial Clock, communication CECO - Front µP
Reference voltage for buffer amplifier IC 7600
Control line, sum of SetFan1+SetFan2, controls speed of set fan
Control line, forms with SetFan2 summary signal SET_FAN_CTRL
Control line, forms with SetFan1 summary signal SET_FAN_CTRL
Stand by
Control line, switches from active to passive standby mode.
High level=passive standby. 7414 serves as level shift from 3,3V-
to 5V logic. Not used by LX9000R front software.
Control line, switches Surround amplifier on. High level=on
Control line, sensor (NTC resistor) for temperature of the heat sink on
the Power Amplifier board. On ASP board short-circuited with "ERR"
to the combined control line "NTC_Amp".
PLL serial data Chip Enable
PLL serial data Clock
PLL serial data. Data In
Signal line, MPX signal for RDS decoder
Signal line, left (right) channel from Audio Tuner
Clock RDS data
Decoded RDS data
Control line, Signal Detection. Low level=tuned
PLL serial data. Data Out and control line for stereo indication.
Low level=stereo
Control line, inverted HIGHPASS_OFF signal. Activates high-pass filter
for analog input signals, which are not processed by MDM board.
High level=high-pass on
(2528/2548 and 3562/3572 shift the lower cut-off-frequency to 100Hz
when transistors 7560/7570 conduct. 2560/2570 serve for DC decoupling
only). On the subwoofer output the low-pass is activated via 7655.
Signal line, line out signal taken from 7604 (after pre-amp.) for input to
7654. As provision only, to reduce load for 7500.
Control line, inverse MUTE_ALL signal. High level=mute
9. EN 219