Maintenance Flow Chart (Cd); Maintenance Flow Chart (Tuner) - Yamaha CRX-M170 Service Manual

MAINTENANCE FLOW CHART (CD)

Start
Power on
NO
Voltages
at pins of connector
(WF15) are normal?
YES
NO
Is CD Play normal?
MAIN Board
YES
Check CD Pickup cable
NO
Are Speaker L&R
output normal?
YES
Power Board (2)
Check connection of the Speaker wire
Normal Operation
1. Check Cable
2. Replace Power Supply unit if Power Board is not shorted,
otherwise find out first where the short is.
NO
Check KA78L05AZ
Is Power Supply
(IC15) or KSC2316Y (Q103)
normal?
and peripheral circuit.
Check TC9462F (IC10)
Is main
or ST92F124 (IC41)
Clock normal?
and peripheral circuit.
NO
Is signal Check TA2153FN (IC12)
RF normal? and peripheral circuit.
YES
NO
Is CD Audio
Check TC9462F (IC10)
signal normal?
and peripheral circuit.
Check TDA7313N (IC52)
Is Volume level
or NJM2068MD (IC53)
normal?
and peripheral circuit.
NO
Check STK442-050 (IC22)
Is Amp gain level
and peripheral circuit.
normal?
YES

MAINTENANCE FLOW CHART (TUNER)

Start
Power on
Voltages NO
at pins of connector
(WF15) are normal?
YES
NO
Are FM/AM
normal?
MAIN Board
YES
Check TUNER module connection Antenna.
Power Board (1)
NO
Is DAB
normal?
YES
MAIN Board
Check DAB Module connection Antenna.
Normal Operation
1. Check Cable
2. Replace Power Supply unit if Power Board is not shorted,
otherwise find out first where the short is.
NO
Check CNVMB114MA18L
Is Power Supply
(Tuner Module)
normal?
and peripheral circuit.
Is PLL Check ST92F124 (IC41)
Clock normal? and peripheral circuit.
NO
Check DAB Module
Is Power Supply
(Venice1.1) and peripheral
normal?
circuit.
Check 74ACT04 (IC44) or
Is Voltage level 74LVC04 (IC45) and
normal? peripheral circuit.
NO
Check ST92F124 (IC41) or
Are Clock and
DAB Module (Venice1.1)
Date normal?
and peripheral circuit.
YES
CRX-M170
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