(b) Remove the front cover. Check the four fuses located on the power
supply printed circuit (PC) board J1. Check the current draw on a circuit which blew a
fuse. Connect the ammeter leads across the blown fuse. Check the current draw in the
run condition. Figure 1-13 lists the current draw for each of the circuits. Excessive
current draw in a motor circuit usually indicates shorted windings or a frozen armature.
A blown fuse indicates an excessive current draw in the circuit. Always
determine the cause of the excessive draw. Never replace fuses with
fuses which have higher amperage ratings.
(c) Turn the power on. Check for 12 0.5vdc (volts direct current)
between TP4 and TP1 (common) on the power board J1. If there is no voltage, check
for 16vac (volts alternating current) between TS2-3 and TS2-1. If there is voltage at
TS2, but not at TP4, check the F1 fuse. If the fuse is good, the power board is not
functioning properly. You must replace it.
(d) Remove the PC card cage cover. Refer to figure 1-16. Check for
12 0.5vdc between TP6 and TP1 (common) on the timing PC board J2, and between
TP8 and TP1 (common) on the temperature board PC board J3. Also check for 20
2vdc between TP7 and TP1 on J2. If any of these voltages are missing, disconnect
power, remove the PC boards, and clean the contacts with an eraser. Check the PJ1
connector to make sure it is clean and tight. Reinstall the PC boards and recheck the
voltages. Replace a PC board that has a voltage problem.
(2) Check the film switch activation. Check the film switch by measuring the
voltage or resistance as outlined by figure 1-17. The film feed switch consists of two or
three sensor fingers attached to a rod over the film feed slot. Refer to figure 1-18. A
counterweight rotates the fingers back up after they are released. The switch itself is
located on the left end of the rod. You can adjust the switching point by loosening the
nylon actuating block that changes the switching point, and retightening the fastener.
Remove the front panel to gain access to the film switch. Replace the film switch if it is
(3) Check the transport timing. The timing PC board J2 has three timers for
the film processing sequence. See figure 1-19. Check each timing function with a
watch. If a timing function is not correct, check for a drive signal at led (light emitting
diode) DS1 of PC board J2. DS1 should light when the timers activate the drive system.
If it lights, the problem is not with the timers. Refer to section 1-4a(8). If DS1 does not
light, perform the power supply and fuse test in section 1-4c(1). If the power supply is
good, the J2 PC board is faulty. You must replace it.