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2.3 INSPECTION AND MAINTENANCE
This product employs rotary and moving parts which wear
out in the course of usage. Periodic inspection, cleaning, lu-
brication and maintenance are therefore important for ensur-
ing maximum performance. Worn parts must aiso be re-
placed as and when required.
2.3.1 Suggested servicing schedule for main components
The following table indicates the suggested period for such
service measures as cleaning,lubrication and replacement
'n practice, the indicated periods will vary widely according
to environmental and usage conditions. However, the indi-
cated components
should be inspected when a set is
brought for service and the maintenance work performed if
necessary.
Also note that rubber parts may deform
in
ume,even if the set is not used.
System
t
Tape
transport
Drive
Other
Parts Name
Operation Hours
L
\ ~1000H | ~2000H
| Upper drum assembly
KO
i
©
if
AC head
KO
| *O
{Lower drum motor assembly
|e
KO
Pinch roller arm assembly
a
|
*
Full erase head
|
*
x
| Tension arm assembly
i
*
|
*
Guide arm assembly
i
o*
*
Capstan motor
=|
O
Belt (Capstan)
i
O
O
Belt (Loading motor)
O
Loading motor
O
Slit disk (supply, take-up)
O
Clutch unit (supply, take-up)
O
Worm gear assembly
O
Control piate
2
;
EKG
Slide plate
|
ae.
| Brush assembly
7
i AO 1 KO
Tensionbandassembly
|
OQ
|
©
Rotary encoder
O
|
% : Cleaning
C; : Inspection or Replacement if necessary
Table 2-3-1
24
2.4
DISASSEMBLY/ASSEMBLY
PROCEDURE
OF
MECHANISM
2.4.1 Precaution before disassembling mechanism
This mechanism has an exclusive operation modo provided
for
disassembling
and installation of the mechanism
(MECHANISM ASSEMBLING MODE), and it is suggested
lo set the mechanism to this mode before disassembly and
installation The exclusive mechanism operation mode is not
generally used and becomes available by manuai setting only.
Then this procedure starts with the condition that the cabi-
net parts,cassette housing assembly and PRE/REC board
assembly have been removed.
2.4.2 How to set the exclusive mechanism operation
mode
(MECHANISM ASSEMBLING MODE)
(1) Turn the loading motor belt by hand.
(2) Confirm that the hole of the control cam are aligned to
the deck hole as shown in Fig.2-4-1.
Loading Motor Belt
oe
tl 1+
|
Hole align with
hole in deck
Control Cam
Fig. 2-4-1
2.5 MAIN
PARTS REPLACEMENT OF MECHANISM
2.5.1 Pinch Roller Arm Assembly
(1) Remove the slit washer.
(2) Tilt up the pinch roller assembly in direction of arrow.
Slit Washer
Pinch Roller
Arm Assembly
2.5.2 A/C Head
1, Removal
{1} Take out 2 screws (A).
(2) Remove the A/C head with head base.
Head
Base
(A)
Fig.2-5-2
(3) When replacing the A/C head only,remove 3 screws (B),
use Care not to misplace the 3 springs.
(B)
AIC Head
' Board
AIC Head
Zo 7 s
Head
Base
ow
&
eo
SS
Fig.2-5-3
2. 'Installation
(1) Temporarily set AYC head height as indicated in Fig. 2-54.
A/C Head
gus /
Fig.2-5-4
NOTES:
* It is very important to correctly adjust the control pulse and
audio signal in addition to the mechanical tape path.
* Perform interchangeability adjustments after electrical ad-
justments,
2.5.3 Pinch Plate
1. Removal
1) Disengage 2 claws, then remove the pinch plate.
f
Pinch Plate
Fig.2-5-5
2. Installation
;
(1) When installing pinch piate,align rack of pinch plate and
triangle mark of control cam as indicated in Fig.2-5-6.
Pinch Plate
Control Cam
Correct direction
L
Fig. 2-5-6
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