Akai GX-270D User manual

www.reeltoreel.nl / Philip van der Matten / ver 1.0 / 20 dec 2023 / page 1 of 5
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Quick Reference Guide to K I GX-270D:
Page:
2 location of the circuit boards, action list
3 component layout of the rec & pb boards
4 component layout of the power & servo boards
5 component list per PCB
6 etc

www.reeltoreel.nl / Philip van der Matten / ver 1.0 / 20 dec 2023 / page 2 of 5
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Location of the internal printed circuit boards:
system control pcb (2221)
peak level pcb (5202)
LR
backside
playback amp pcb (5017)osc & rec amp pcb (5016)
servo control pcb(2036)
power supply pcb (2222)
Common problems, service, revise, overhaul, refurbish actions etc:
□ Replace all caps on REC & PB boards, see pg. 3 & 4
□ Replace all transistors on REC & PB boards with KSC1845, see pg. 3 & 4
□ clean both speed switches
□ replace all sparkkillers on power supply pcb, and 1 between reels on front
□ TIP48 transistor replace with TIP50
□ (replace 4 diodes on servoboard with FR207 (1000V / 2 ) )
□ (replace 8 diodes on power supply board with FR207 (1000V / 2 ) )
□ motor caps 5µF/150V capstanmotor + 2x 4µF/250V spoolmotor. could be replaced if necessary
□ big 330µF/160V high ripple cap could be replaced
ll specs are for the CEE 220/240V version
TIP48 330µF/160V
5µF/150V
capstan
4µF 2x
spool motors

www.reeltoreel.nl / Philip van der Matten / ver 1.0 / 20 dec 2023 / page 3 of 5
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osc & rec amp pcb (5016)
47/50 47 100/25 47 47 47 100/25 1/25 100/25 47 47 47 100 47 47/50
rightleft
Component side
10/16 10/16 10/16 10/1610/16 10/16 10/16 10/16
10/25 10/1610/16 10/25
playback amp pcb (5017)
10/16 47 47 47 47 47 100/6,3 100/6,3 47 47 47 47 47 10/16
output
Component side
1/25 10/16
C1845
x12
10/16 1/25 10/16 10/16
10/1610/16
4,7/25 4,7/25
!
!
10/1610/16
C1845
x12

www.reeltoreel.nl / Philip van der Matten / ver 1.0 / 20 dec 2023 / page 4 of 5
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button
relais
10/25 1/25 1/25
33/25 33/25
33/25 3,3/25
1/25 100/16 1/25
10/25
system control pcb (2221)
power supply pcb (2222)
0,47µF/250V
MP/film/foil
(2x)
220/25
470/50 220/35
Sparkkiller
0,1µF + 120Ω
(7x)

www.reeltoreel.nl / Philip van der Matten / ver 1.0 / 20 dec 2023 / page 5 of 5
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cap µF/volt # transistor/semi/diodes #
power supply pcb 470/50 1 replace all 10D4 FR207→4x
220/35 2 replace all 10D5 FR207→4x
0,47/250 2 axial, film
0,1+120hm 7 sparkkiller
-
system ctrl pcb 1/25 4
10/25 2
100/16 1
3,3/25 1
33/25 3
-
servo pcb 0,47 BiPolar 1 replace all 10D2 FR207→4x
1/25 1
10/16 1
100/25 1
3,3/25 2
47/50 1
-
peak level pcb 0,47/25 2
10/25 2
3,3/25 1
4,7/25 2
47/25 1
-
playback pcb 1/25 2 replace all trans. c1845→12x
10/16 8
100/6,3 2
4,7/25 2
47/25 8
-
rec + osc pcb 1/25 1 replace all trans. c1845 →12x
10/25 12
100/25 4
47/25 10
[some caps are combined at a higher voltage for convenience]
total 87
Component list per PCB