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14.10 SIZE SENSOR CHECK
Size sensor check.
Are 0301 and 302 on?
YES
Remove the record and move the
tonearm from the rest with the
locate switch (turntable rpm).
N
O
(Using an oscilloscope) are the out- ..._
N
_O
___.
.,
put waveforms from JP4 pins 2 and 3
as shown below?
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YES
(Using an oscilloscope) Do the fol
lowing waveforms appear at 01 pins
24 and 25?
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N
O
YES
OK
Check the mechanism base board,
R303, 304 and LED for errors.
Check the base 081 and 82 and then
check the direction of 081 and 82.
OK
Check 081, 82 (PhTr) (Is if bent in a
strange way?).
Perform error and pattern checks on
R 1 to R4, and 08 and 9. Also check
the patterns from the 08 and 9 col
lectors to O 1 pins 24 and 25.
14.11 SPEED SELECTOR FAILURE
46
The 33/45 selector doesn't work.
Is the speed switch 01 pin 16 "L" at NG
33rpm and 01 pin 15 "L" at 45rpm?
YES
When the 33/45 switch is changed
N
O
does 01 pin 9 change from "H" to
"L"?
YES
At that time does 02 pin 14 change
from "H" to "L"?
YES
{ Does the speed selector move freely?
( Does it get stuck half way?)
Check the patterns from S6 to 01
pins 15 and 16.
Check the patterns from 01 pin 9
to 02 pin 3.
Perform error and pattern checks
from 02 pin 14 to 02 pin 4 RB.
Perform pattern and error checks
from 02 pin 14 to R92, 93 and 092.
Check the phone motor.
YES
At that time does 02 pin 13 alter
i..-----1 nate between approximately 7V and
OV?
N
O
Check the patterns from 02 pin 13
to JP7 pin 3.