Service Position - Sequential prophet 5 Technical Manual

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PCB 3
COMPUTER
BOARD
W703
PCB 3/4
INTERFACE
PCB 4
VOICE
BOARD
BACK VOICE
PANEL POWER
CABLE CABLE
1-2 SERVICE POSITION
To set up the Prophet for service first switch power off and turn instrument over to expose bottom
panel. Figure 1-0 identifies (•) screw hole locations around the per imeter of the bottom panel.
Remove eleven bottom panel screws.
Holding top and bottom panel assemblies together, turn the Prophet right-side-up again. Remove
four screws (•) along the top edge of the back panel. Slowly slide the top panel assembly forward
— about six inches — so when raised, the control panel knobs will dear the power supply capacitors.
Raise the top panel assembly to service position shown in Figures 1-0 and 1-1. For best stability both
top panel side back edges should rest on the bottom panel. The top panel upper edge rests on a
cable from the back panel. This is normal; but a small (half-inch) prop may be added to support the
top panel edge, and perhaps improve stability.
WARNING
LETHAL VOLTAGE IS PRESENT IN THE POWER SUPPLY PRIMARY CIRCUITRY. BE CAREFUL.
The instrument can operate normally in this position. As shown in Figure 7-7, PCB 4 is completely
accessible for trimming (see Section 4).
Figure 1-1
Service Position