ENSONIQ DP/4 Service Manual page 3

Figure 1 - DP/4 Exploded View . . . . . .
lmportant Things to Know About the DP/4:
Reinitialization . . . . . . . . . .
System Reset Sequence and Hard Reset . . . .
DP/4 Case . . . . . . . . . . . . . . . .
Noise When Using Tue DP/4
Figure 2 - Mono cables and Tip, Ring, Sleeve (TRS) cables .
Cables . . . . . . . .
DON'T GET SHOCKED!
Power Supply
Checking the Power Supply Circuitry . . . . . . .
DP/4 Transformer and Transformer Secondary Boards
Figure 3 - DP/4 Transformer Secondary Boards
Figure 4 - AC Power Connections . . . . . . .
Power Supply Voltage Chart . . . . . . . . . . .
Figure 5 DP/4 Main Board Test Points
Figure 6 - Testing a Transformer Secondary Board Unloaded
Displa y
Display Self-Test Mode . . . . . . . . . . . . . . . .
Figure 7 - DP/4 with No Display or Display is in Self-Test
Unexpected Event Messages
Low Battery Message
Figure 8 - DP/4 with a Low Battery Message when you tum it on
Audio Problems
Figure 9 - DP/4 with an Audio Problem
Checking Audio Signals between Main and Keypad/Display Boards
Test Procedure
1. Setu p . . . . . . . . . . .
2. Turn on the DP/4 and Reinitialize
3. Display/Keypad Test . . . . .
4. Analog Page . . . . . . . .
5. Mute Test, Battery Backup Test
Figure 10 - DP/4 System Block Diagram .
DP/4 Burn-in Test Procedure . . . . .
DP/4 Software Notes (version 1.06 thru 1.14)
T o Check the DP/4 Software Version . . . .
DP/4 Service Manual
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TABLE OF CONTENTS
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inside cover
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Table of Contents
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