Akai MX-550 Service Manual page 22

3-1.REPLACEMENT OF THE PINCH
ROLLER BLOCK
1) Pull the PINCH ROLLER BLOCK upward (#) while re-
leasing the PINCH ROLLER RETAINING HOOK
2) Reassemble in the reverse order.
PINCH ROLLER BLOCK
PINCH ROLLER
RETAINING HOOK
_ Fig.3-1
3-2.REPLACEMENT OF THE PB HEAD
(TAPE 1)
1) Remove the two HEAD RETAINING ® SCREWS.
2) Pull out the HEAD and disconnect all the lead wires
with a soldering iron, then replace the PB HEAD.
3) Reassemble
in the reverse
order. After replacement,
head azimuth and PB level (AX-650 only) adjustment
must be performed.
HEAD RETAINING
L (> (@) SCREWS
NE BLACK | GRAY
YELLOW
Fig.3-2 Fig.3-3
3-3.REPLACEMENT OF THE REC/PB
HEAD (TAPE Il)
1) Remove the two HEAD RETAINING @ SCREWS.
2) Pull out the HEAD and disconnect all lead wires with a
soldering iron, then replace the REC/PB HEAD.
3) Reassemble in the reverse order. After replacement,
head azimuth,
PB level (AX-650 only), BIAS current
(AX-650 only) and REC level (AX-650 only) adjust-
ments must be performed.
HEAD RETAINING
(A) SCREWS
aes
BLUE YELLOW
Fig.3-4 Fig.3-5
22
3-4.REPLACEMENT OF THE CAPSTAN
MOTOR
1) Disconnect the lead wire of the CAPSTAN MOTOR
with a soldering iron.
2)Remove the CAPSTAN MOTOR RETAINING ©
SCREWS, then replace the CAPSTAN MOTOR.
3) Reassemble in the reverse order and set the DRIVE
BELT. After replacement, tape speed adjustment must
be performed.
CAPSTAN MOTOR
LEAD WIRE
CAPSTAN MOTOR
RETAINING (8) SCREW
Fig.3-6
3-5.REPLACEMENT OF THE DRIVE BELT
1) Remove the CAPSTAN MOTOR RETAINING
SCREWS. (refer illustration Fig.3-6)
2) Unsolder the lead wires of the SOLENOID with a sol-
dering iron.
3) Remove the two MOTOR PCB RETAINING © SCREWS
and separate the MOTOR PCB from the MECHA BLK.
Replace the DRIVE BELT.
4) Reassemble in the reverse order. After replacement,
confirm the tape speed and if the result is not satisfac-
tory, adjust the tape speed.
SOLENOID MOTOR PCB
LEAD WIRE RETAINING © SCREW
CAPSTAN
MOTOR
SOLENOID
DRIVE BELT
Fig.3-7