Minolta XD-11 Скачать руководство пользователя страница 27

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Figure 57

S P R IN G FOR
D IA P H R A G M -M E T E R IN G R IN G

Figure 58

the voltage range of 1.1 to 2.2V w itho u t a
lens.

W ith the MD f/1 6 lens set to the

minimum aperture, you should measure

200  to 300 millivolts.  The f/2 2  lens should
give  you  a  reading  of 2.9  to  3V.  And  the
f/3 2  lens should  provide the MD common

voltage of 2.1 to 2.3V.

But, if you measure 0V, you know

there's a problem w ith the minimum-

aperture resistor or w ith the mode selec

tor S8. First check the contact at the

right-hand side of the mode selector
brush, Fig. 55. Notice that Fig. 55 shows

the later model of the camera. Here,

Minolta added the bridge over the mode

selector to maintain better brush contact.

If cleaning the mode selector doesn't

solve the problem, suspect the minimum-

aperture resistor. Also, it's possible that
you have a break in the strip of flex cir

cuit, Fig. 54. The flex-circuit strip con
nects the minimum-aperture and dia

phragm  resistors  to  the  main  circuit
board.  In  that case,  you'll  have to replace
the complete resistor board,  Fig.  53;  we'll

describe the procedure in a moment.

Poor contact in the diaphragm resistor

also causes the overexposure LED to re

main on. You can use another voltage

check to test the diaphragm resistor after

removing the top cover. Measure the volt

age between ground and the AV contact.

Fig. 54; you should measure around 2.9V

w ith the release button partially depressed.

Now rotate the diaphragm-metering ring

against its spring tension as you monitor the

voltage. You should see the voltage
smoothly decrease to around 2.8V.

REPLACING THE M IN IM U M -

APERTURE RESISTOR

To clean and reform the brushes of the

minimum-aperture and diaphragm re

sistors,  you'll  probably  have  to  remove
the  lens-mounting  ring.  You'll  also  have
to  remove  the  lens-mounting  ring  to

replace the resistor board. Notice the
position of the lens-mounting ring in Fig.

56; the corner indicated in Fig. 56 must go

toward the bottom of the camera.

Now remove the lens-mounting ring by

taking out its four screws. Then lift out
the bayonet spring, Fig. 57. Also discon

nect the spring from the diaphragm-
metering ring, Fig. 58. When you lift out

the diaphragm-metering ring, the spring

should stay connected to the spring clip,

Fig. 59.

The long resistance path you can now

see, Fig. 59, is the diaphragm resistor; the

brush remains w ith the diaphragm-
metering ring. To remove the brush

assembly for the minimum-aperture resis
tor, disconnect its spring and remove the

Содержание XD-11

Страница 1: ...Minolta XD 11 Repair Guide Figure IB OVERRANGE LED SHUTTER SPEED SCALE UNDERRANGE LED DIAPHRAGM WINDOW Figure 3 Figure 4...

Страница 2: ...ong other innovations the XD 11 settled the debate over aperture preferred vs shutter speed preferred automation it gives you a choice between either mode To program the camera for automatic shutter s...

Страница 3: ...perture sizes A combination magnet permanent magnet plus electromagnet limits the movement of the diaphragm closing lever As the diaphragm closing lever starts to move the permanent magnet holds its a...

Страница 4: ...with its own batteries However you can connect a 3V DC power supply to the battery compartment Fig 8 Connect the positive power supply lead to the battery compartment terminal and connect the negativ...

Страница 5: ...st be closed before the comparator output connects to the base of T6 S1 sits at the bottom of the camera Fig 11 When you cock the shutter S1 closes to connect the comparator to T6 S1 opens after the e...

Страница 6: ...re may be a problem with the release switch or with the release circuit But if the transistor T6 is at fault you w on t have to go any fur ther You can make a final check on T6 by shorting between the...

Страница 7: ...g 16 away from the M1 core toward the front of the camera The M1 ar mature now opens switch S7 Conse quently you should measure around 1 3V at the white wire connection Fig 15 The technique for holdin...

Страница 8: ...manent magnet Fig 17 Dirt can prevent the core from magnetically hold ing the armature If cleaning doesn t do the job the per manent magnet may be defective Try pushing the armature of M2 away from th...

Страница 9: ...D IAPH RAG M CONTROL IC2 SHUTTER RELEASE LOCK DRIVER FOR LEDs IC1 D IAPHRAG M CONTROL PHOTOCELL AMPLIFIER SPEED CONTROL OUTPUT LIGHT LEVEL FILM SPEED Figure 18 Actual schematic Figure 19...

Страница 10: ...ting provides the in put voltage to one input of the com parator the combination of the film speed setting and the photocell output provides the voltage at the other input If input 1 in Fig 19 is less...

Страница 11: ...sassembly Remove the speed knob and note the loose release pin The release pin closes the switches for the metering and release functions You can completely remove the camera back by depressing the hi...

Страница 12: ...ring Then rotate the wind lever in a counterclockwise direction as you seat it over the wind shaft The upper coil of the wind lever return spring sometimes sneaks under the wind lever If that hap pens...

Страница 13: ...e the film speed dial Why With the film speed dial remov ed the film speed brush doesn t make firm contact with the resistor ring Fig 31 The camera then exhibits the symp toms of an open film speed re...

Страница 14: ...ask lever pulls the mask over the window for the shutter speed indication Remember the shutter speed setting has no meaning in the A mode The spring loaded scale to the front of the pentaprism provide...

Страница 15: ...memory capa citor can continue changing as long as the memory switch Fig 36 remains clos ed Fig 33 points out the memory switch in the camera Just before the mirror starts to rise the insulated lever...

Страница 16: ...ansistor charges the timing capacitor With a larger more positive base voltage the transistor con ducts harder it then charges the timing capacitor more quickly However if there s no voltage across th...

Страница 17: ...the shutter to deliver only its fastest speed Suspect a poor ground connection if you measure a voltage at the red electromagnet lead when you par tially depress the release button If you measure arou...

Страница 18: ...l hang open If the trigger switch fails to close or makes poor con tact you w on t be able to bring in your shutter speed adjustments especially the fast speeds Erratic shutter speeds may also result...

Страница 19: ...parator provides the switch for the closing curtain electromagnet M3 When the comparator output at pin 16 drops low current flows through M3 to hold open the shutter The voltage at pin 16 goes high to...

Страница 20: ...Figure 41...

Страница 21: ...board Finally take out the four front plate screws Notice the position of the one slotted screw the locating screw in the upper wind side corner You can now separate the front plate m irror cage assem...

Страница 22: ...escribe a special tool for adjusting the LED readout a dummy camera body which has a special cutout over the variable resistors But according to Minolta the dummy camera body isn t available You can t...

Страница 23: ......

Страница 24: ...round 0 6V despite changes in current So with two diodes in series the voltage at pin 7 should remain constant at approximately 1 2V The filter capacitor C1 helps maintain the constant reference volta...

Страница 25: ...Figure 52...

Страница 26: ...istor labeled R47 in Fig 52 The f 22 lens moves the brush to the third resistance path here the S12 brush connects pin 9 of IC2 directly to positive battery Fig 52 With the f 32 lens the brush moves o...

Страница 27: ...he overexposure LED to re main on You can use another voltage check to test the diaphragm resistor after removing the top cover Measure the volt age between ground and the AV contact Fig 54 you should...

Страница 28: ...of the LEDs will turn on W ith the front plate m irror cage assembly removed you have a good view of S7 Fig 60 Fig 60 shows the mirror cage in the charged position The M1 ar mature now sits in contact...

Страница 29: ......

Страница 30: ...have to stop down as far in bringing the pin 8 voltage to the pin 11 voltage At the X B and 0 settings the shutter speed brush moves to the ground land shown just below the RTV resistor in Fig 63 Pin...

Страница 31: ...ve for transistor 1 Fig 64 The timing capacitor then charges more quickly You can then check the shutter speed resistor RTV by measuring the voltage to pin 20 of IC1 in the M mode Again the voltage sh...

Страница 32: ...14 of IC1 ground and the negative lead of C3 Fig 55 The large resistor has no effect on the normal operation However it allows the timing capacitor to eventually charge and close the shutter You may...

Страница 33: ...ixed resistor R56 as shown in Fig 69 Depress the release button part way to measure the voltage You should get a reading of 180mv 0 180V 2mv If not make the adjust ment using Rx7 Turning the wiper of...

Страница 34: ...ond and the diaphragm to f 16 With the film speed dial set to ASA 100 expose the lens to a light level of EV 9 Now measure the voltage between the common S11 path Fig 66 and ground Record your voltage...

Страница 35: ...y find that the shutter occasionally jams the closing blade doesn t quite complete its release movement Then by pushing down the closing blade from the back you may be able to get the shutter to opera...

Страница 36: ...Figure 73 WASHERS Figure 75 Figure 77 Figure 74 Closing blade set Part 2005 0712 01 Figure 76 Opening blade set Part 2005 0713 01...

Страница 37: ...out the three shutter retaining screws Then lift the shutter far enough from the mirror ARM CLOSING BLADE Figure 79 First section o f opening blade in position Figure 80 cage to reach the wires which...

Страница 38: ...closing blade push the bulb lever out of engage ment with the armature from left to right in Fig 84 The spring loaded armature then moves away from the electromagnet and strikes the closing blade lat...

Страница 39: ...e the armature But another lever the mechanical speed latch holds the armature to provide the full aperture speed The mechanical speed latch sits just under the bulb lever Fig 86 When the opening blad...

Страница 40: ...reasing the spring tension by turning the spring hooking tab counterclockwise causes the timing cam to rotate faster The result A significant change in the fast speeds But don t use the spring hooking...

Страница 41: ...re Fig 89 It s now up to the electromagnet the bulb lever or the mechanical speed latch to hold the ar mature and prevent the closing blade from releasing Also the ridge on the timing cam drives the t...

Страница 42: ...h that you don t lift up the blade driving levers If you do the pins on the other sides of the blade driving levers will come out of the slots in the blade sets Then if the in dividual blades shift in...

Страница 43: ...circuit for adjusting the trig ger switch Just connect the timing cir cuit to the shutter s lead wires as shown Figure 99 in Fig 98 There s only one problem you disconnect the shutter leads to remove...

Страница 44: ...agnet In Fig 100 we ve provided a variable resistor adjust ment to establish the reference voltage at the noninverting input of the comparator Use the variable resistor to adjust the tim ing circuit f...

Страница 45: ...he metering switch should close when the release slide moves down 0 4mm REMOVING THE FLEX CIRCUIT Other than for replacement purposes there aren t too many reasons to remove the flex circuit The compl...

Страница 46: ...tially depressed It s also possible to check the individual LEDs without removing the flex circuit completely Fig 104 points out the hole that receives the ground screw Connect a jumper between the gr...

Страница 47: ...resulting in a shorter delay between the closing of the release switch and the opening of the memory switch The time delay assures that the dia phragm reaches the taking aperture before the memory sw...

Страница 48: ...mir ror cage Remember though that remov ing the combination magnets requires that you readjust their positions on reassembly You can now see the diaphragm control parts The mirror tensioning lever mo...

Страница 49: ...se the eccentric if the self timer fails to pull down the release slide far enough to release the shutter TIMING THE SPEED SELECTOR On reassembly it s possible to replace the speed selector 180 out of...

Страница 50: ...tension on the spring the scale would definitely break After you connect one end of the tung sten wire hold the other end as shown in Fig 115 Now let go of the spring loaded pulley and allow the sprin...

Страница 51: ...ut the two wind seat screws Fig 119 Then lift out the wind seat Watch for a loose endplay spacer on the top of the wind shaft Fig 120 not all cameras use the endplay spacer Also if you removed the win...

Страница 52: ...e sprocket gear at the bottom of the body casting Watch for a washer on top of the sprocket gear You can now remove the take up spool from the back of the body casting Fig 123 The take up spool has th...

Страница 53: ...roper position of the notch Seat the two plastic gears on the base plate Then insert the counter ac tuator into the hole in the back sensing lever Rotate the counter actuator to the position shown in...

Страница 54: ...counter gear Fig 125 If the counter actuator doesn t align with the tooth slot and instead comes against one of the gear teeth you ll see the counter dial shift in position as you close the camera bac...

Страница 55: ...lastic gears in the Seiko aren t nylon they re Delrin the toughest of plastics The Delrin parts never seem to break Although the Seiko holds up under most types of abuse there s one mis treatment it c...

Страница 56: ...brown and red magnet leads Fig 39 shorted 3 H IC defective Check the voltage at pin 10 Fig 51 You should get 3V when the shutter releases 4 IC1 defective Check the voltage at the brown electromagnet...

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