Minolta X-300 User manual

X-300 (2025-100)
X-370 (2025-300)
---For U.S.A. & Canada
TYPE OF CAMERA
Electrically controlled 35 mm focal plane shutter
SLR AE camera
Photography system : Aperture priority AE and
manual photography
Standard lens | MDSOmm F 1.2, MDS0mm F 1.4,
MDS500m F 1.7, MDS0mm F 2
Lens mount : Minelta SLR bayonet mount
Film used : JI35 rolled film
Size of image field : 24 mmx 36 mm
SHUTTER
Electrically controlled focal plane shutter
(Traveling holizontally) .
Shutter speed : Auto---4sec. to 1/1000 sec
Manual---], 1/2, 1/4. 1/8. 1/15,
1/30.
1/60,
1/125,
1/250,
:
Setting
shutter
speed
indicator
1/500,
1/1000
sec.
and
B
(Shutter
speed
LED
blinking
at
(bulb).
4
Hz)
Shutter
speed
dial
‘:
Click
stop
endless
dial
:
Flash-ready
signal
(LED
next
to
Shutter
release
“60”
blinking
at
2
Hz)
:
Battery
check
(by
mode indication:
Indicator
ON
when
batteries
are
serviceable;
blinking
when
near
exhaustion:no
LEDs
light
when
exhausted)
: Electromagnetic release, remote
cord. wireless controller [R-|
can be mounted.
Shatter release locks in case of
battery voltage drop.
With main switch ac ON.
Self timer + Electronic self-timer starts by Mirror + Slide-up quick return
depressing the operating button. FLASH SYNC
Operation is indicated by camera- Syne speed * X contact, electroflash is synch-
front LED blink. ronized at speeds slower than 1/60
Shutter release notice is given. sec: flash bulb is at speeds slower
Self-timer operation can be than 1/15 sec.
canceled anytime before release. Hot shoe : Direct comtact. syne auto control
EXPOSURE CONTROL
Light metering system
contact
FILM WINDING, REWINOING
Film winding By lever. Winding at an angle of
: TTL center-weighted
average metering.
Detector element :
1 Silicon photoce!|
Auto exposure interlock range
: EV 1-18 (ASA/TSO 100 [/1.4 lens)
Film speed scale °
AE lock
Metering switch -°
VIEW FINOER
Type
Viewfinder showing
Magnification :
Dioptrie power °
Finder indication :
ASA/TSO 12-3200 (locked every
1/3 step)
: Only for A mode.
Operation by pushing self-timer
lever down.
By touch switch or depressing
of operating button slightly.
Memorizing of metering and
finder LED indication for [5
sec. after the switch OFF.
: SLA pentaprism type
Focusing sereen :
Center-+-Split-image and micro-
prism
Periphery: Acute Matte
> 95% of 24mmxX 36 mm [film
frame ares
0.9 (using SO mm lens at = set-
ting)
—1 diop.
Mode indication in use (A, M)
: Shutter speed scale with LED
indication
Slow shutter speed indication for
I-4 see (Y)
: Over-/under- range LED indication
blinking at 4 Hz (4/7)
‘ Besetting indicator ( #)
130° (preliminary angie: 30°)
: Auto winding by Motor Drive | or
Auto Winder
“> With Safe Load Signal
' Auto resetting calculation.
Safe Load Signal
By rewind button and crank
system: auto reset of rewind
button.
Film counter With
Film rewinding <
BACK COVER
Opening/Closing by pulling up knob, snapping back
the cover.
With grip, memo holder ([SO, DIN, ASA table)
POWER
Two 1.5 V alkaline-manganese (LR44: Eveready A-76
or equiv.) or two 1.55 V silver-oxide (SR44: Eveready
G13 or equiv.)
OTHERS
Battery holder and Eyepiece cap
SIZE ANO WEIGHT
§1. 5 90% 137 mm (2% 3-9/19% 5-3/8 in.)
470 g (16-9/16 oz.) without power cells
ACCESSORIES
Flash : Auto Eleectroflash 320X. 200X. 132X.
118X
Winder : Motor Drive Ll. Auto Winder G
Remote control : Wireless Controller [R-] set
Remote Cord S/L
: Interchangeable Minolta lenses
and applicable Minolta SLR system
accessories.
Others

Comparision
table
between
2024
and
2025
I. Appearance
(only differences are described)
Item
Note
* Top cover
* Mode/ shutter speed
selector
* Filmadvance lever
* For 2025, only silver model is
available.
* Discontinuity of Auto lock
mech, of mode/shutter speed
selector.
Back
grip
Yes
No
Bottom
cover
Same
shape
Marking:
JAPAN
or
MARAYSIA
Bayonet
lens
mount
SUS
BS
(Cr. plating)
Main switch
* ON-OFF changeover
« No audible piezoelectric
warning mark
I. Function
Item 2024 2025 Note
* Discontinuity of direct autoflash
metering contact.
* Flash fires manually with PX
; series (360PX can be used as
Direct autoflash
— Yes + No sensor auto),
—— * No flash-distance checker in
viewfinder.
* Discontinuity of slow-shutter
syne function.
Sync terminal Yes No ¢ No electric shock prevention.
Preview button Yes No
Audible piezoelectric Y No * No slow-shutter-speed warning.
warning = + No self-timer audible beeps.
F-number indication
No
in viewfinder Yes
* Back cover: fixed type (not
Connection with Multi- detachable)
Yes No . =—
Function Back * Discontiouity of contact
terminals.

REPAIR
Mi The contents of this manual are mainly related to the adjustment
procedures for the 2025.
Except for Exposure adjustment, Installation of external parts, see 2024 Service Manual.
“Page” column provide with * shows related page of 2024 Service Manual Repair Guide
M Assembly and adjustment procedures Page Page
(DBody assembly 1 (spool, sprocket, winding base plate A)crrssssrrsrerrstssstetesenseeeeereeseresneeees 1
WSprocket gear positioning methad -+----+--++-++sesseseeeeeeeenseeseenseceesnnererserscareresencessacsaessees 2
Body assembly 2 (winding GMalt) vcereeeceseeseeeeeeeeeeeeeeeneeeessareenteemenseeeeneceeecssesaseseraesnanes 3
Winding gear positioning MOthOd ‘ocrtrscseee erect ese cceeeecessscsnenceencasnsnaceennassnasssensasaseenensces 4
HiReversion stop lever stop timing adjustment ss:sercttsetssssetsseessenesseesessenecseceenesccescescess 4
GBedy assembly 3 (winding base plate B) vcrrrrrereesrsreserreeeeernessesensesessenerasssssenteseresenanens 5
W Overrun eccentric pin adjustment PTTeTiTTiTr Tt ttt ee et ee ree 6
Wcheck of WINING Mechanismnss*srs+essrsseennccnsesenseessswecssescessesstsenssesenssasessteesencenessensston 7~8
GFront base plate biock assembly | (shutter, mirror box, magnet base plate) sss+++++++-++ 9
W Check of magnet attraction Prrrre rrr Titre 12
()Front base plate block assembly 2 (finder block, bayonet mount, front cover. etc.) ----- 13
(S)Front base piate block assembly (mounting front base plate black onto body) ----+-+----- 14
M Shutter: gear: position: -adjus tmeritissccs-eessetetsesee nsevess erstsesnnsnnostecsansersereereesererssreersvese es 15
W Shutter charge adjustment wevenden socepsenecnecentencseseetsas, TeeTririre TrTrririliTririitie et iT ee 16
(IF lexible P.C board imstallation -scrtsrecestststeeenretsesseceeeceeeeeesneseeeeenenereneseecseereatecseereeeens 7
Wi Body back adjustment Sereerrerrrrrrr errr errr eee rr 19
WFinder back AGIUSTME|NT <s1--trerr ess eereoenseeenesseecnensnsnssnoracesensasoscsssaccrconcernsoserencencorsceseass 20
MExposure adjustment
(UASA INclination adjustment “ssrresssresesseetesereeeseeeeteeeeeteaneesecsnnesenccnetessncanenens 3
(GJA/D conversion reference voltage adjustment --------ssrseseeserseetseeeeeneeeeeeneee 3
(3]Manual SS adjustment -ssrererersveverseesensenesseennercesenassssansarssnsenanacssasncenscsonecs 4
(@A- BUtO level adjustment --*sr~rresserereesenesecescesetecersesnenessesssercsssuceastcssnssrseses ia
Wi Check Of LED indication vstrestsrssssresseecsesseceereteeesencneeesersnreasseaseeesesaenaaaanes 6
MiCheck and adjustment of release lock voltage and LED blink voltage «~~ &
MiCheck of limits at high and low shutter speeds ~srrr+rrsretsssserrereereerereeeserees 6
Binstallation of external POPES *oseecencsseseccssevoeesesasacressasssscnesnasseqeasnseccoccoasonsencsss 7
@ Shutter block assembly procedure eeececsnenceeeceteeeens oo see ceeeneeeeneaereenee 31
W Shutter block adjustment +--+--++s1ssseersereeeeceenersenseneesenessnesssesesaceaseeeasacsanecsscessees 8
ME Mirror box assembly procedure ss-++sssssssseerrerrersersesseessesencessareancrsssscesassncncesausaseesecesceses 37
Bi Measuring PSTPUMENtS «cer seer eet e ee eeeeee eee eeeeeee en eren eee eeeenenecseeeeeerneeeeneeneseesaeeneneneeeaeeeneenee 41
Bi Focusing plate replacement procedure Perrerrrre rrr eter rr rrr) 42

%
Mi
Adjustment
and
checks
to
be
made
(Body, winding unit
W Sprocket gear positioning bese ee see ees sess sen esses scenes seeseeeseseeeesesesennseeesessasseeessecssenssssessssees 2
Bi Winding gear positioning rT rit tee eee 4
MEFilm counter operation gear positioning -s------+rr+--tstererretteecetseetteseeeeeteteceeenreresecatteees §
HM Reversion stop lever stop timing adjustment *rrrrers++ser+r>* sd ese ceeseceasecseesenseneteccesreceesensss 4
MOverrun eccentric pin adjustment ----s----esesesrseseeensereeeseeseeesecensensessanseessesenensnseas cess 6
BW Sprocket Claw position Check s-rssssesesssseeeseeeteeweeensneeeaseecneessneeeeneaeeaeceneceneeeeasenseeennas 7
@ Reversion Stop lever timing Check so-rrrrrereesscrcesereneseseccscnenanccescerancnsesssssscenenrenssesenenses 7
MWinding operation lever timing Check -crrrtttsrcrsreseesersetsseesseeeseeesencareserenserscecsnnsneeseenes 8
ZiShutter operation
BH Shutter gear position adjustment peeeee err er errr errr rer rrr rrr errr 15
B Shutter Charge adjustment cevrsseerseoreeeseeeeeeeceerereeeresweseessenseesennsssesnssnessesssnsasacsanaenas genes 16
W Shutter curtain POSITION CHECK sosrertrerssenerstereneesenenseseseenssencennseresennensersaesaserenenseerersaras 33,
MB Mirror magnet attraction Check -<-r-s+sscsstesesstesesnseesenencesencenccncnnenessssesnnnanenrsnacsanenacecs 12
Mi Release lock VOltage Check sss:sssseessessssseensseaneenscenceessecnsceneensseesecnseessearsnassacsenenseneees 28
MSynchro X time lag coscereesscrooseacnecenansvoosssosecseennonsonsusccnansosansssseneansnecsasonsneneas 8
(Shutter speed
WCurtain speed adjustment -------crreeeseeeeeeerersesnresteeeensnecsenessnsesseresneeneaneasenssanes 4, 8
Mi Manual SS adjustment <--s+sseessesseeseseseeeseresneesseneseassenersennessnseneasennenseneensessnnes 4, 8
‘@ Auto exposure
BASA inclination SUS teienitassrcrsce see sre nese se tee nst see sees anasisensssecseergoecevsoserssscsenesese 3
HEA/D conversion reference voltage adjustment srrrsstrretetesececeeeseeteeereeeneeeneetes 3
MB A-auto level adjustment ----+-s-scesscceessesessseeesseeseeneeeeeeneeeeanenneesanenensensenansanssanes 5
MiCheck of release Magnet attraction cs ssercssesssresseeesesnesceenscnscesesrsccsocsosconeressuennensssconss 12
Mi Check of limits at high and low shutter speeds re .|
LED
WcCheck of LED indication -<*-t+tt+*tttstessseee ees eneeeneesee Sesecnesecescnerecnnenesaceeerecesoesenes 5
MB Check of LED blink VOItage osceerectsseeseeessenneerenssecesssenscenssnsrsensncaserseseswennanneens 6
(Viewfinder, focusing
WM Body back adjustment PPTTTTTITITITTTTTI TTT lire 1S
Wi Finder back adjustment PITTTrTT TT iriiit iit tt rr pee 20
Mirror angle adjustment eeeenenen prereset 39, HO

Wi Precautions
Mi The following precautions must be taken concerning ail piastic parts.
1.
When
cleanig,
use
Flansoive
or
alcohol.
Do
not
use
thinner,
ketone,
ether,
etc.
2.
Secure
ail
parts
with
the
specified
screws,
taking
care
not
to
exent
excessive
stress
to
them.
MHandling of the flexible board
The flexible board uses MOS !Cs and is very sensitive to static electricity. Therefore, the follow-
ing points must be kept in mind when repairing.
®
When
handling
the
flexible
board
itself
or
wiring
it
to
the
body, use
a
conduction
mat
to
prevent
Static
electricity,
and
perform
all
work
as
shown
in
the
illustration
beiow.
Touch the conductive mat with
your hand beforehand
Conguctive mat
MiWhen grounding is impossible, connect the cable to a large metal plate (steel desk or shelf).

Mi Preparation for adjustments
. «Temporary nut
(2017-3303 75)
_-—— ASA brush holder
ea
Si -—-Main SW. holder
L
2
0
MFor the generai adjustment or
check, use battery.
(Use new battery)

Mi Exposure adjustment
WResistor positions and adjustments
MFig.1 °
Release lock voltage, LED blink voltage
ASA inclination (144 mVi
A/O conversion reference voitage (288 mV)
A-auto level
WiBeforehand
set
ASA
film
speed
to
ASA
100
properly
as
below:
Set
ASA
brush
holder within
range
of
ASA
100.
MIFig. 2
if ee
+ ASA 100 range
, swilen holder
SV resistor plate

[1] Adjustment of ASA inclination
MiMeasuring instrument : Digital multimeter (Type 2508, 3476, 2507)
Hi Adjustment procedure
1. Set the metering switch to ON and adjust by turning VR, so that the voltage at the point
in Fig. 1 is (In case of 25°C room temperature)
Depending on the temperature when adjusting, use the table below to get adjustment voltage.
Fig. 1 (Adjustment voltage)
Temperature ("C) 15225 | 20+2.5 | £25 |M225
Adjustment voltage (mV) | 1392 | 141.522) M4+2 | 16522
[2] Adjustment of A/D conversion reference voltage
MiMeasuring instrument : Digital multimeter (Type 2508, 3476, 2507)
Wi Adjustment procedure
1,
Set
the
metering
switch
to
ON
and
adjust
by
turning
VR;
so
that
the
voltage
at
the
point
in Fig. 2 is | 288+3mV | (In case of 25°C room temperature)
Depending
on
the
temperature
when
adjusting,
use
the
table
below
to
get
adjustment
voltage.
(Adjustment voitage)
Temperature (“C) 1822.5] 02.5 | G+2.5] MWt25
Adjustment voltage (mV) | 27823 | 233 | Bit} | B3+3

(3] Adjustment-of manual Ss
Wi Measuring instruments: Shutter tester (Model S-2101, FS-1DMN4)
W Adjustment procedure
@
Determine
position
of
TV
brush,
referring
to
Fig.
2,
or
looking
at
shutter
speed
LED.
MFig.2
Relation
between
TV
brush
heider
position
and
manual
ss
O00D0000
a
TOUTEOUEOUTOT NUNES
Nel
1. Shutter speed adjustment and check (see the table below)
Step [tem Part adjusted Adjustment (check! Remarks °
® 1/1000 curtain (Both lst & 2nd curtains | If it is more than 13ms or less than lO ms, adjust the
speed check are within [3 ms.) 2nd curtain speed.
1/1000 3:
@ adjustment eccentric pin ee
@ | 1/60 cheek — (16~18. 5 ms)
@ |X time | (Range A: O.4ms or more) | Cheek it with SS 1/60 and if is defective, periorm
eae (Range B: 2.4ms or more) | the adjustment on P. 8.
e When the exposure unevenness at steps @)~@ is over 0.3 EV in both B-A and B-C
ranges, and over 0.4 EV in the A-C range. adjust the curtain speed as follows.
@ For the shutter speed standard, refer to the inspection standard.
2. Curtain speed adjustment
Adjust by turning the ratchet so that the 1st and 2nd curtain speeds are | 1120.3ms/ at
1/1000.
HIFig.3 (Increasing the curtain speed) MIFig.4 (decreasing the curtain speed)
O41; ot
ol
@ Remove the battery case base plate while
pushing ratchet to release the ratchet claw
and the rachet return.
(Do not return it completely.)
@ Return it sufficiently and adjust by slowly
increasing the curtain speed.

[4] Adjustment of A-auto level, check of LED indication
Mi
Measuring
instruments
:
Luminance
box
(Model
L-2101,
L-222,
L-223)
: EE
tester
(Model
EE-2101,
EE-2111)
: SS
adaptor
for
EE
tester
(Model
SD-2101)
: Master
lens for
S-auto
(2005-0001-75)
Hi Adjustment procedure
1. Set the camera and measuring instruments as follows.
@ After setting the master lens, turn it counterclockwise to put aside the looseness to. one
side.
Fig. 1 Master lens for S-auto
Luminance box
EE tester
® Luminance box ® Camera @ Master jens @ EE tester ® SD-2101
K value: 1.2 Shutter dial: A Aperture: F 5.6 K value dial : 1.2 Aperture switch: F 5.6
* Luminance: EV 10. 15 ASA: 100 Distance : = ASA dial: 100 Luminance switch: Same as
luminance
box.
% When using luminance box (L-222 or L-223). set it at EV 11, and use a ND filter (MINOLTA
ND50% FOR ADJUSTMENT). ‘
2. Adjust and check as follows:
Shutter speed | EE level Indication allowable range
i adjusted
ae 5 ae adj ustment allowable range oo (+0. SEV)
1/60 | (co | a
1 EV 10 34 ms — VR. (Fig.2) | 1/30 | (ceo2 | cot] oo
Vis | = = | io
2 EV 15 —_ +0. 4EV (Check only)
HiFig. 2