Polaroid ProCam Repair Manual page 11

than full output, the thyristor circuit (TH1 and TH2) stops the discharge of energy
from the strobe storage capacitor (C8). Instead of being dissipated, the energy
remains stored and is saved for the next strobe fire. Thus during the recharge
cycle, only the difference between the stored amount of energy and the full value
of the strobe storage capacitor must be generated.
To reduce the recharge time even further, the ProCam strobe incorporates another
feature called sneak charge. Actually occurring at the end of one exposure cycle
in preparation for the next exposure, the sneak charge utilizes the period between
shutter blade closure and the start of film processing. During this part of the cycle,
the strobe storage capacitor receives a small amount of energy. After film
processing, normal charging tops off the circuit with enough energy for the next
flash exposure.
Strobe Specifications
Table 1-1 lists and describes the ProCam specifications.
Specification
Strobe range
Charge Time
Stored Energy
Light Output
Strobe Duration
Strobe Preferred
Automatic Recharge
- Charges or tops off
when:
Table 1-1. ProCam specifications
Description
1.5 to 18 feet (0.46 to 5.5m)
Maximum of 8 seconds
30 wattseconds
Maximum - 750 BCPS
Nominal - 600 BCPS
Minimum- 460 BCPS
1/666 to 1/20,000 sec.
Camera is erected; new film is loaded
and door closed; flash override switch is
turned off; S1 is partially pressed; film
frame is processed.
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