Test & Debug Flow - Kenwood RXD-M909 Service Manual

14. TEST & DEBUG FLOW
POWER ON
YES
NO
Flash Memory
Show LOGO?
operates properly?
YES
SDRAM works
ES8390 VIDEO
outputs properly?
Check AV cable connection
Does tray was
NO
inserted inside when SW5 & SW7 signals
you push Disc1~5
on P403 are OK?
button?
YES
OPEN / CLOSE
signals on IC401 are
Load+ & load- signals
on P403 are OK?
Check the cable connection between
A
DVD PCB and MD (MECHA).
Note: This shooting is the original circuitry so there are some different points from RXD-M909.
Check connection lines between
NO
FLASH & ES8390 or the FLASH
access time whether is suitable or not.
YES
Check connection lines between
NO
SDRAM.
(IC502) & ES8390 or the SDRAM is
properly?
damaged.
YES
Check the related circuit of
NO
ES8390 (IC501)
PIN77,78,79,80,81,82,83,84,85,86
YES
to TV set.
NO
Check the MD mecha
YES
Check the output signal of
NO
ES8390 to IC401 for control
OPEN/CLOSE.
OK?
YES
NO
Check the Tray control I/O
Pin on IC401.
YES
A
YES
Does the
NO
SLED move to inner side
SLED signal is OK?
when it is at outer
position?
YES
Check the cable connection
with MECHA.
Proper
Optical
NO
Focus outputs
Lens is moving
for searching Focus?
to motor driver?
YES
Proper F+ & F-outputs?
Check cable connection
B
with pick-up head.
YES Check the related circuit of SLED
and Motor driver IC ( IC401)
YES
NO
Check Focus connection on
ES8390 and motor driver IC.
YES
NO
Check the motor driver (IC401).
YES