Symptom
Shutter does not
release, no LEDs
Underexposure in
S mode
Diaphragm
always stops
down fully in S
mode, LEDs ok
Diaphragm fails
to stop down in
S mode, other
functions ok
Shutter delivers
fastest speed
only, other
functions ok
A uto speeds
erratic
Cause
come against the blade of S7 w ith
the mirror cage tensioned.
1. No voltage to the lower circuit
board. Check fo r 3V at the red wire,
Fig. 21. If you do not get the battery
voltage, check the battery
compartment and the wiring.
2. H-IC defective. Check fo r 3V at pin 1
of IC1, Fig. 65, w ith the release
partially depressed. If you do not get
the battery voltage, remove the
mirror cage, connect a DC power
supply, and check fo r 3V at pin 6 of
H-IC w ith the release partially
depressed, Fig. 51. If you get OV at
pin 6, but 3V at pin 5, replace H-IC.
1. Diaphragm-control magnet M2,
Fig. 62 — oil on interface between
core and armature.
1. Diaphragm-control magnet M2, C5,
T5, or T13. Test the components
as described on page 18, Mar-Apr
1980 issue.
1. Diaphragm-control magnet M2,
Fig. 62, fails to hold its armature.
Check for a dirty interface between
the core and armature, and check
the adjustment. Fig. 68.
1. Electromagnet M3, open coil or not
holding its armature. Check by
shorting the brown wire, Fig. 39,
to ground as you release the shutter.
The shutter should stay open for as
long as you hold the short. If not,
the problem is w ith the shutter
electromagnet M3.
2. Capacitor C9 (between the 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 wire. Fig.
39. You should get OV when the
shutter releases. If the brown wire
remains at 3V, the IC1 comparator
isn't switching low.
1. A ir cylinder on side of mirror cage,
Fig. 107, dirty, or memory-time-lag
adjustment incorrect.
2. Memory switch, poor contact.
Symptom
Overrange LED
remains on,
diaphragm stops ·
down fully in S
mode, shutter
delivers only
fastest
mechanical speed
in S and A modes
Overrange LED
remains on, other
functions ok
LED indication
does not change
in S mode
Shutter hangs
open on manual-
speed settings,
other functions
ok
Cannot adjust
fast manual
speeds
Causa
3. Trigger switch S4, poor contact.
1. Film-speed resistor SV, poor contact.
2. Mode sw itch, poor contact.
1. Diaphragm resistor, poor contact.
Check for a changing voltage at the
A V contact, Fig. 54, as you rotate
the diaphragm-metering ring w ith the
release button partially depressed.
1. Minimum-aperture resistor. Fig. 59,
poor contact.
2. Break in flex strip connecting
diaphragm resistor to the flex circuit.
Check the MD common voltage at
the point shown in Fig. 54 in the S
mode. You should measure 1.1 to
2.2V w ith o u t a lens.
1. Shutter-speed (TV) resistor, poor
contact.
2. Shutter-speed-resistor board, shifted
in position.
1. Trigger-switch S4, poor contact or
adjustment.
2. Constant-current adjustment (Rx7 in
Fig. 69) incorrect. Check fo r 180mv
between the points indicated in Fig.
69 — the film-speed resistor must be
assembled to get the proper voltage
reading.
