Write Current Switch (Xc And Ic); Diagnostic Mode Of Operation (Dm, Dl, Ml , M3, M4); Diskettes; Loading The Diskette - Tandon TM848-1E Specification And User Manual

WRITE CURRENT SWITCH (XC AND IC)

T he XC op tion a l l ow s t h e h ost c ontr oller t o
switch the Write Current independently of the
d rive's onboard m i c r oprocessor. It i s
installed.
T o implement th e I C o p t i on, r emove the X C
jumper, then install a jumper at IC.
XC IC WRITE CURRENT
SWITCHING
X
External Write Current
switch.
X
Microprocessor automat-
ically switches Write Cur-
rent at Track 43.

DIAGNOSTIC MODE OF OPERATION

(DM, DL, M1, M3, M4)
The test programs allow the user to test some
aspects of drive operation without the use of
s pecial t est e q u i pment. Th e p r o gr ams a l l ow
t he user to isolate the problems of th e d r i v e .
The diagnostic m ode p r o v ides 1 6 t e st s ( see
Table 3-4).
To enter the diagnostic mode:
1 . M ak e a n o t e o f wh i c h j u m p e r s a r e
installed fo r n o r m a l o p er at in g c on di -
tions (see Table 3-3).
2. Remove t h e D L , M 1, M 3, a n d M 4
jumpers.
3 . I n st al l t h e D M j um p e r , a n d s u p p l y
power to the drive.
4. U s i n g t he D L , M l , M 3, and M 4
j umpers, s e l ect
desired by inserting the jumper accord-
ing to Table 3-4.
To exit the diagnostic mode:
1. Remove power from the drive.
2 . Remove the DM , DL , M 1 , M3, and M 4
jumpers.
f a c t or y
t h e di a g n o sti c t e s t
3 . Reinstall th e j u m p ers in t h eir or i g i n al
configuration.
4. Power on the drive.
3.7 D I S KETTES
The TM848-1E and T M 8 4 8-2E dr i ves use an
I BM-compatible,
ettes are available with a single index hole or
with mult i ple (index and sector) holes.
D iskettes wit h
s oft sector f o r ma t
diskettes provide sector i n f o rm a t ion t h r o u gh
the use of an index sensor and electronics.
F igure 3-5 i l l u st r a tes th e di skette used wi t h
t he drive. This r ecording m edia i s a fl e x i b l e
d iskette enclosed in a p r o t ective j a ck et. T h e
d iskette, free t o r o t at e w i t h i n t h e j a c k et , i s
c ontinuously cleaned by it s soft f a b ri c l i n i n g
during normal operation.

LOADING THE DISKETTE

The drive is loaded by inserting th e di skette,
with its head aperture forward, into the front
slot of the drive. Access to the diskette loading
slot is obtained by opening the front lever.
The diskette should be carefully inserted until
it is solidly against the back stop.
Damage to the center o f the disk-
e tte may
c losed when th e d i skette is n o t
properly i nserted. This p r events
reliable recovery of the recorded
data.
WRITE PROTECT TAB
The drive i s e q u i pped w i t h a W r i t e P r o t e ct
Sensor Assembly. This sensor operates in con-
j unction w i t h
cut in the protective jacket.
3-14
e i g h t - i nc h d i s k e t te . D i s k -
a s i n g l e h ol e ar e u sed w h en
i s r e q u i r ed. M u l t i pl e h o l e
CA UTION
r e sul t if th e d oo r i s
t h e d i s k et te, wh ich ha s a s l o t