Werbung
Verfügbare Sprachen
Verfügbare Sprachen
Drum replacement (for 2/4 drums; drum assem-
bly supplied for Hi-Fi models)
. Clean up the drum shaft.
2. Make a clearance at the rotary transformer.
This
is an important procedure to maintain the per-
formance.
1) Some rotary transformer clearance shims are
packaged in the servicing upper drum assem-
bly or lower drum assembly.
Install the thin-
nest (0.06 mm) of the shims onto the lower
drum shaft. (Refer to Fig. 4-46(a) for thick-
ness.)
2) Install the upper drum assembly onto the
drum shaft.
3) Install the pre-load collar.
4) Exert a force of 14.7 N (1.5 kgf) on the pre-
load collar from above (using a commercially
available load meter).
Tighten up the set
screws (M4) of the pre-load collar.
5) Turn the upper drum by hand and listen to see
if the rotary transformer gives no rubbing
sound.
6) If the transformer sounds, replace the in-
stalled shim with the next thicker shim.
Take the above steps 1) thru 5) until no rub-
bing sound is heard any longer.
7) Make sure no rubbing sound is heard. Finally
add the 0.03 mm thick shim.
. Place the pre-load collar back in position in the
direction marked in disassembling. (See Fig. 4-45.
for setting.)
. Exert a force of 14.7 N (1.5 kgf) upon the pre-
load collar from above.
Tighten up the set
screws of the pre-load collar (1.18 Nm
(12
kgf-cm)).
. Place the drum earth brush, drum
earth brush
spring and drum motor back in position.
. After replacement, be sure to check the tape
drive train adjustment (See page 24.) and the fol-
lowing electric adjustments.
®@ Adjustment of the playback switching point.
@ Checking and adjustment of the X-position.
@ Adjustment of SP and LP slow tracking preset.
@ Precautions in drum replacement
. The drum assembly is very delicate.
Handle it
with enough care.
dust, dirt and any other foreign matters.
because this adjustment is important in order to
maintain the performance.
28
Werbung
