Operation At Other Voltages - Shure Pro Master 700 Service Manual

OPERATION AT OTHER VOLTAGES

The Model 700 and 706 consoles are supplied wired for
operation at an input of 120 Vac *10°/~, 50/60 Hz. For oper-
ation at 240V, 220V, 200V, 140V or 100V, follow the steps
listed below. Open the cover as described in SERVICE
ACCESS. Remove the screws securing the PC board-fan
assembly to the bottom panel and remove the assembly to
provide working room. For 240V, 220V or 200V operation,
unsolder and insulate the black lead from fuseholder XFl
to UNSWITCHED AC receptacle J20 (J20 will be inop-
erative at these voltages). NOTE: Fan B1 is permanently
wired and will continue to operate at 120 Vac with the
following wiring changes. (Figure 3 illustrates terminal
strip TSl, located between transformer T I and fan B1,
and the jumper and transformer T1 leads which must be
moved.)
240V Operation:
1. Cut the bare jumper between the redlblack and blue1
white leads.
2. Unsolder the yellowlblack lead and solder it to the
redlblack lead.
220V Operation:
1. Perform the above steps for 240V operation.
2. Unsolder the white (AC) lead from the bluelwhite lead
terminal and solder it to the terminal with blue and
yellow leads.
200V Operation:
1. Cut the bare jumper between the redlblack and blue/
white leads.
2. Unsolder the yellowlblack lead and solder it to the
white transformer lead.
3. Unsolder the white (AC) lead and solder it to the
terminal with blue and yellow leads.
140V Operation:
1. Cut the bare jumper between the red/black and blue/
white leads.
2. Unsolder the blue lead and solder it to the redlblack
lead.
3. Unsolder the white transformer lead and solder it to
the yellow lead.
100V Operation:,
1. Unsolder the white (AC) lead and solder it to the white
transformer lead terminal.
2. Solder a jumper wire between the white transformer
lead terminal and the terminal with blue and yellow
leads.
Reposition the power harness and mount the PC board-
fan assembly before testing the unit. For 240V, 220V and
200V operation, obtain a suitable ac plug and attach it to
the line cord. Obtain a 5A, 250V, type 3AB or ABC fuse
(for the 700 console), or a 3A, 250V, SLO BLO, type AGC
or 3AG fuse (for the 706 console), and insert it in place of
the present fuse. Check for proper operation by measuring
voltage across capacitor C5 or C6: Under no-signal condi-
tions, the voltage should be 54V t 3 V . Be sure to mark the
rear panel with the new operating voltage.
As supplied, Model 700E6 and 706E6 consoles are set to
operate from 240 volts. To change operating voltages, dis-
connect the ac power (mains) cable, select the desired
operating voltage using the rear-panel VOLTAGE SE-
LECTOR switch, and make certain the fuse ( F l ) is of
the proper value.
TRANSFORMER REWIRING
FIGURE 3