Service Check Procedures; When The Main Unit Fails To Operate; When Main P.c.b. Is Defective - Yamaha CDR-HD1500 Service Manual

CDR-HD1500
QQ
3 7 63 1515 0
I SERVICE CHECK PROCEDURES

When the main unit fails to operate

Check
Reconnect cables
connections NG
of all
and check again.
cables.
OK
Check
Check the condition
NG
the power
of the power supply
supply.
section.
OK
Does
the FL
NO
blue LED indicate
display light
up?
YES
* ATAPI device
or ACDR2
defective
* ATAPI device means HDD and CD-R/RW drive.
TE

When MAIN P.C.B. is defective

L 13942296513
The MAIN P.C.B. consists of the following 3 blocks.
1) CPU, DRAM and Flash Memory
2) ACDR2 and DIR5
3) CODEC and analog
Check
the NG
RESET
signal.
OK
Check
the
NG
CPU
clock.
OK
Is the ICS
terminal of the flash
NG
memory at LOW and
accessed?
OK
www
Is the
DRAM
NG
refresh function
at work?
.
OK
DRAM defective
16
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+5V, +12V, ±VA
Does the
MAIN P.C.B.
NO
defective
power ON?
YES
FL driver or
FL display
defective
Refer to the
RESET circuit
waveform at
defective
the point C
on p.45.
Refer to the
waveform at
Crystal defective
the point A
on p.45.
CPU defective
Flash memory failure
x ao
y
or CPU defective
i
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8
I
NG
OK
NG
OK
NO
YES
Q Q
3 6 7 1 3
OK
OK
OK
u163
.
OK
2 9 9 4 2 8
+5V, +12V,
NO
YES
R
1 5 0 5 8 2 9 9 4
NG
NG
NG
m
NG
co
9 9
VA
2 8 9 9