Yamaha CRX-M170, Service Manual

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9
CRX-M170
■
MAINTENANCE FLOW CHART (CD)
Start
Power on
Voltages
at pins of connector
(WF15) are normal?
Is CD Play normal?
Are Speaker L&R
output normal?
Normal Operation
MAIN Board
Power Board (2)
1. Check Cable
2. Replace Power Supply unit if Power Board is not shorted,
otherwise find out first where the short is.
Is Power Supply
normal?
Is main
Clock normal?
Is signal
RF normal?
Check CD Pickup cable
Is CD Audio
signal normal?
Is Volume level
normal?
Is Amp gain level
normal?
Check connection of the Speaker wire
Check KA78L05AZ
(IC15) or KSC2316Y (Q103)
and peripheral circuit.
Check TC9462F (IC10)
or ST92F124 (IC41)
and peripheral circuit.
Check TA2153FN (IC12)
and peripheral circuit.
Check TC9462F (IC10)
and peripheral circuit.
Check TDA7313N (IC52)
or NJM2068MD (IC53)
and peripheral circuit.
Check STK442-050 (IC22)
and peripheral circuit.
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
■
MAINTENANCE FLOW CHART (TUNER)
Start
Power on
Voltages
at pins of connector
(WF15) are normal?
Are FM/AM
normal?
Is DAB
normal?
Normal Operation
MAIN Board
Power Board (1)
MAIN Board
1. Check Cable
2. Replace Power Supply unit if Power Board is not shorted,
otherwise find out first where the short is.
Is Power Supply
normal?
Is PLL
Clock normal?
Check TUNER module connection Antenna.
Is Power Supply
normal?
Is Voltage level
normal?
Are Clock and
Date normal?
Check DAB Module connection Antenna.
Check CNVMB114MA18L
(Tuner Module)
and peripheral circuit.
Check ST92F124 (IC41)
and peripheral circuit.
Check DAB Module
(Venice1.1) and peripheral
circuit.
Check 74ACT04 (IC44) or
74LVC04 (IC45) and
peripheral circuit.
Check ST92F124 (IC41) or
DAB Module (Venice1.1)
and peripheral circuit.
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO