Teac A-4070G - Page 33

No muting
Both reel motors
fail to operate
Muting relay(K-12
eae
), muting
diagram, delay relay(K-4c),
play relay(K-1d), jack
loose (J-303).
Play relay (K-la)
No forward play
No reverse play
Remote control jumper plug
missing or loose, play
-button(S-801), play relay
(K-1), diode(D-4), sensing
ampl.
Play button(S-802),
reverse relay (K-2,K-3),
diode(D-4), sensing ampl.
Refer to muting diagram, and
replace the defective
components.
Replace the defective
components.
Repair or replace defective
components.
Repair or replace defective
components.
Auto~reverse does
not function with
and sensing fail
Repeat operation
faulty
No playback
Playback noise or
hum
Fail length too short,
sensing post dirty, sensing
ampl., sensing relay (K-6).
Fail length too short,
sensing post dirty, repeat
switch(S-8), not on or
faulty, sensing relay(K-7),
sensing ampl.
Playback head dirty, ampli-
fier to deck connection
(J-301) , monitor switch,
playback ampl., Delay relay
(K-4c), play relay (K-1d),
muting relay(K-12), muting
diagram.
Faulty connections, head
selector switch(S-lavb)
faulty playback head, and
ampl.
Noise or hum during
record
Fail should be 1/2" long,
clean sensing post.
There is a built-in 40 sec.
recycling period for the
repeat unit. It will not
operate if a repeat cycle
of less than 40 seconds is
required.
Refer to playback ampl.,
voltage chart.
Repair or replace defective
components.
Magnetized head, faulty
connections (J-301), MIC
level set to max., record
ampl. bias osc.
No record or no
erase
Bias osc., erase/record
head dirty, record jack
loose(J-302), master VR
jack loose(J-306), record
relay (K-301), record Sw.
(S-10), record ampl.,
resistor (R-303), record
selector switch(S-6,S-7).
Demagnetize and clean head,
repair or replace defective
components.
Refer to schematic diagram
and repair or replace the
defective components.
Voltage chart.