Akai M-9 - Page 32

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SECTION “A” TROUBLES WITH AMPLIFIER
1. Playback problems (Unit set in play position)
No sound from Line-out jack
B(+),
voltage
not
supply
Silicon
diode
5GB
or
R7-1.8K
0.
(1W)
defective
Playback
amp.
card
and
socket
loose
connect
P-101,
J-701
loose
connect
Check transistors TR-201, 202, 203 and 204 |
B(+), voltage supply
Playback head coil opens or lead wire takes off |
Rectifier SPN-01 defective
Fuse (F1-1A) defective
No sound from SPKR out jack
B(+), voltage not supply
B(+), voltage supply
Transistor (TR303, 304) defective
Silicon
diode
(SW05-01),
R4(9100)
C1(5004.F)
defective
|_|
Replace
|
Dirty
head
surface
Check transistors TR-201, 202, 203 and 204
Hum
is
decreased
if
playback
head
is
grounded
|
—|
Playback
head
shield
or
insulation
defective
Replace
|
Inductive
pick
up
Playback card and socket loose connection
B(+), voltage tow
B(+), voltage normal
Sound comes out but volume
insufficient
|
Irregular scratching or crackling noise
Transistor TR-201, 202, defective |__| Replace |
Dirty head surface
Tape itself
Tape itself noisy
Transistors (TR-201, 202), defective
Dirty heod surface
Back tension weak
Squeak noise
Hissing noise Noise comes out when playing tape
Not caused by tape
Lack of treble
Poor contact between head and tape
Adjust tension of supply spindle
jead angle incorrect -—
——— Re-adjust head angle | a na a ee ere ee
Head worn out
Tape itself defective
Sound distorted
Clean the head
Defective transistors
Dirty head surface