Hot Shoe Pin Functions - Polaroid ProPack Repair Manual

HOT SHOE PIN FUNCTIONS

(Refer to Figure 1-10)
As mentioned previously, the hot shoe connection on the camera has five pins which mate with
the five pin connector in the ProFlash. The function of each of the five pins is as follows:
Pin 1 connects camera ground to the strobe ground.
Pin 2 carries information which informs the strobe exposure circuit of the setting of the camera
film selector. That is;
Setting
80, 3000
3000ER
Pin 3 connects the + side of C2 (the camera integration capacitator) to the ON pole of the strobe
ON/OFF switch. When the strobe is ON, pin 3 works in conjunction with pin 4.
Pin 4 connects the + side of C3 to the common pole of the strobe ON/OFF switch. With the
strobe ON, C3 is connected in parallel with C2 (3000ER) and with C1 (80 or 3000).
In the strobe mode, the network of capacitors C1, C2, C3, and resistor R6 provides a shutter
speed of about 1/125th of a second. When the strobe is turned OFF, pin 4 inhibits the flash from
firing and the camera operates in the ambient mode.
Pin 5 connects shutter switch S4 (through resistor R11) to the strobe trigger circuit. Therefore,
when S4 is closed by the shutter capping blade, a voltage is transmitted to the strobe. If the
strobe is ON, it will fire. Typical transmitted voltages area:
STROBE ON/OFF SWITCH ON - + 0.5V
STROBE ON/OFF SWITCH OFF - + 0.1V
FIGURE 1-10 PROPACK CAMERA SCHEMATIC
Pin 2 Voltage
+0.67 V (nominal)
0.00 V
13 ProPack Camera