Technics RS-TR575 Service Manual

Power switch tums on but
mechanism does not operate
（common to both mechanism）．
Voltage check：
ApProx．5V at CNI pin9and CN2
pin14
ApProx．7，5V at CNI pin13and
CN2pin12
Approx．15V at CNI pin10and
CN2pin13
0V（ground）at CNI pin12and
CN2pin10
YES
NO
Connection and power check．
Check switches in the seIf・
diagnosis mode（see page9）．
Any switch ls not failure stored in
memory？
NO
YES
Replace any failed switch with a
new one．
OPENICLOSE does not operate
correctly．
NO
YES
DECK l
DECK2
S853，S854
S803，S804
Unplug the power cord and force
thedoorto the half−open position
by hand．
The doordoes not cbse when the
power cord is plugged in again，
check door switches S803and
S804are in the off positions．
YES
NO
DECK l
DECK2
Both powerand microprocessor
SyStem are nOrmal．
S853，S854，CN1③
S803，S804，CN2③
Does the voltage at CNI pin3
change when the door swltch
（S803and S804）ls forced into the
on position？
NO
YES
DECK1⑭
DECK2②
Switch is failure．
Does the voltage at the
microprocessorterminal aIso
change？
NO
YES
Tothemicroprocessorcheck
section．
Check connection between the
motor PCB and the sub PCB．
一27一
Does the flywheel tum instantly
when the AC cord is pIugged in？
YES
Force the mode switch into the
onpositionformorethana
second．
Does the head lift once and then
Iower？
NO
ム
YES
YES
Does the plunger instantly pu
in？
NO
YES
Are power and connection
checks normal？
Tothemicroprocessorcheck
section．
NO
Power is failure．
Microprocessorchecksection
NO
↓
lsthevoltageatMicroprocessor
pin57apProx．5V？
Connection and power check．
）
L
↓YES
lsthevoltageatMicroprocessor
pin60apProx．5V？
↓YES
NO
）
NO
L
lsthevoltageat Microprocessor
pin240V？
7
NO
↓YES
lsthevoltageat Microprocessor
pin590V？
NO
「
YES
F
ls the clock osciIlating？
（check with an oscioscope and
1：10probe．）
YES
NO
（
There are no Pulses at
microprocessorpin18and CN3
pin12？
audio circuit
「
YES
「F
Check power，D601and D602
circuits and their connections．
Does failure occur in audio
circuit or tape mechanlsm？
）
To the audio circuit
「
tape mechanism
F
To the tape mechanism．
一28一

Technics RS-TR575 Specifications

General

Brand	Technics
Model	RS-TR575
Category	Cassette Player
Language	English