Technics RS-TR474 Service Manual page 11

| RS-TR4;
Mi SELF-DIAGNOSTIC
Indicating Procedure
To indicate Self-Diagnostic Function
1. Check both Deck 1 and 2 are empty (no cassette tape),
then turn on the power. ; ; :
2. Press and hold the DOLBY (NR) button (for more than 3
seconds), and also press the Deck 2 STOP (ll) button
for about 2 seconds until the level meter changes from
constantly lit to blinking.
3. Insert a normal tape for Deck 2, either A or B side of
which has the erase preventing piece folded. Then
close the cassette holder.
4. Press the Deck 2 F. PLAY (B®) button and play the tape
for more than 1 second, then press the STOP (I)
button.
5. Insert a normal blank cassette tape for DECK 2, bothA
and B sides of which have the erase preventing pieces
respectively, and close the cassette holder.
6. Press the REC (@) button.
This automatically makes Deck 2 perform the
following operations.
[Record an eight second portion with no sound. | => Record a 20 second portion off 400Hz test signal.
¥
TPS-REVIEW search mode} 4=|Stop the. unit
(NOTE: The tape has to be taken up by playback for about 1 minute.)
7. Insert a normal tape for Deck 1, either A or B side of which has the erase preventing piece folded.
Then close the cassette holder.
:
8. Press the Deck 1 FF (PP) button. _
This automatically makes Deck 1 Perform the following operations. ss
FF mode (approx. 2 second)| =| REW mode (approx. 2 second)| {Stop the unit ,
To return the display to normal mode, switch the power off and then back on again.
To have the indication appear again, take the above-stated steps 1, 2 and 9. ; :
NOTE: The contents of the self-diagnostic mode are stored in memory. To clear the memory, press the STOP (Hi)
button on Deck 2 for more than 6 seconds, until! "CL" appears in the FL dispaly.
Indicating Position
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Indication Text
Symbol Trouble Remedy
Irregular action of cassette mechanism. The cassette mechanism mode switch and plunger are
(Example) Pressing the FWD PLAY button results in REW defective. :
PLAY action. (Check and replace them.)
No recording can be made, or the unit is placed in the The erase preventing switch contacts improperly, or
recording mode though the erase preventing piece has there is a shortcircuit.
been broken. ; (Check and replace the switch.)
HO1
HO03 Pressing the PLAY (>) button causes the motor to rotate | there-is a shortcircuit.
though no cassette tape is in. (Check and replace the switch.)
The cassette hoider will not open or close when the
OPEN/CLOSE (A) button is pressed.
Pressing the OPEN/CLOSE (A) buttton causes the
cassette holder to open after it has closed, and vice versa.
The cassette holder open/close detect switch contacts
improperly, or there is a shortcircuit. (Check and
replace the switch.)
The auto tape select (CrO,) switch contacts improperly,
or there is a shortcircuit.
(Check and replace the switch.)
The automatic tape select (Metal) switch contacts
improperly, or there is a shortcircuit.
(Check and replace the switch.) >
When the PLAY (>) button is pressed, the tape runs alittle | The hall IC is defective and, as the result, reel pulse is out
No treble is produced when a normal! tape is played or
recorded.
Excessive treble is produced when a CrO,/Metal tape is
played, or the recorded treble is destorted and at a low
level.
H04
HO06
07
The playback IC is defective.
TPS dose not operate. (Check and replace the IC.)
FO02