Technics RS-TR575

RS・TR575
RS・TR575
Tape mechanism
DECK1：
DECK2：
131膿o「W701①0
Thevoltagedoes not input toAD
change as each operating switch
is pressed？
NO
DECK1：
Voltage increases from OV
in aPProx。0，4V
increments when Power，
StoP，F．Play，R．Play，FF
and REW buttons are
pressed in that order．
DECK2＝
Voltage increases from
O．4V in approx．0．4V
increments when StoP，F、
Play，and R．Play buttons
are pressed in that order．
Caution＝
The counte「「eset is
connected to other
mechanism systems，
Example＝
To check mechanism1，be
sure to press the counter
reset switch on
mechanism2．
YES
Tape mechanism1
Does tぬe voltage change at
CN52B pin4when S853and S854
0f the mechanism PCB（or the
CrO2and Metal switches of the
mechanism）are forced into the
on positions？
NO
YES
Does the voltage change at
CN52B pin4when switch of the
mec益anism（MODE，Revers REC
lNH and HALF SW）are forced
into the on positions．
NO
YES
Check continuity of switches
whose voItage does not change
when pressed。
In case of failure，replace with
new switches。
Are pulses apPlied to terminals
13，15and160f IC852when the
mode switch is pressed on？
Connection check for Connector
switch is failure．
Soldering c銑ecks
Tape mechanism2
NO
YES
NO
Does the voltage change at
microprocessorpin l when
S803and S8040f the
mechanism PCB（or the CrO2
and Metal switches of the
mechanism）are forced into the
on positions？
YES
NO
Does the voltage change at CN2
pin4when switch of the
mechanism（MODE，Reverse REC
lNH and HALF SW）are forced
into the on positions．
YES
Are pulses apPlied to terminals
13，15and160f IC802when the
mode switch is pressed on？
Audio circuit
「
F
Does the voltage change at IC152
pin12when in the REC and Stop
modes？
lC152is normaL
NO
）
NO
「
YES
「
Do pulses develop at
microprocessorpins20and21
when REC mode changes to Stop
mode
Microprocessorisfailure，
〉
YES
v
Do pu Ises develop at IC152pi ns
2and3in the REC and Stop
modes？
NO
）
Connection checks for
connectors，FFC cable。
YES
v
IC152is failure．
NO
Do pulses develop at
microprocessorpins26，27and
28when the mode switch is
pressed on？
NO
YES
Microprocessorisfailure．
YES
NO
Do pulses口evelop at
microprocessorpins25，27and
28when the mode switch is
pressed on？
YES
As shown above，check the voltage at each pin of IC152for the foowing：
①Equalizer120μs170μschange．
②Dubbing seed does not change．
③ErasecurrentdoesnotchangebetweentheCrO2andNormal1Metaltape．
（Erase current for CrO2and Normal tape is the same．）
④Decklanddeck2producesnochange．
⑤Dolby off，B and C produces no change・
⑥REC and Play produces no change．
⑦AutoRECmutedoesnotoperate．
Does the plunger pull in Play
button is pressed instantly？
NO
YES
Does the plunger remain puIled in
during FF／REW operations？
Plunger is failure、
Q854，Q804，D802，D852，D854，
D804failure．
lC8010r IC852is failure．
NO
YES
Belt has come off．
Reel motor failure．
lC8520r IC802is failure．
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