Ensoniq esq 1 service manual

Page 2

INTRODUCTION

As with every ENSONIQ product, all ESQ-l service will be handled through the ENSONIQ ,
Module Exchange Program. Rather than diagnose and exchange individual components, you will»
replace complete modules. We feel this is the most time and cost effective method of repair. both
for you and your customers. -

The ESQ-1 Service manual is divided into four different sections and includes service information
on both the ESQ-l Digital Wave Synthesizer and the ESQ-M Digital Wave Synthesizer Module.
In April of 1987. ENSONIQ replaced the Metal Case of the ESQ-l with a Plastic Case. You can
use the following criteria to determine which case is which:

§T_YLE_ W W
METAL 10000 - 24999 40900004001 NO HEAT SINK ON BACK
PLASTIC 25000 - HIGHER 40900007001 HEAT SINK ON BACK

There are no interchangeable pans between the metal and plastic ESQ-l. There is service
information, however. that applies to both types of cases. It is for this reason that you find
sections of the manual dedicated to: both the metal and plastic ESQ-l (Section 1), the metal
ESQ-1 only (Section 2), the plastic ESQ-1 only (Section 3) and the ESQ-M (Section 4).

TABLE OF CONTENTS
Figure I ESQ~1 Front Panel Controls

METAL AND PLASTIC ESQ-1 (Sectlon 1)
Internal memory
ESQ-l Test Procedure A
; Memory Protect Test
Memory Backup Test
Analog Input Test
Sustain Jack Test
Sequencer Jack Test
Cartridge Test
Keypad Test
Stereo Test
. Tape Output Test
10. Tape Input Test
1 1. Filter Tune
12. Sound Test
13. MIDI Test
l4. lie-initialization Of ESQ-l
15. Hard Reset
Using Self-Test Mode to Diagnose Display Assemblies

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Software Nores 0.5. 1.7 thru 0.5. 3.5 , 8
Hardware Notes

Battery Low Message

System Error Message 10

Flowchart - Troubleshooting an ESQ-l with a Blank Display

Metal ESQ-1 (Section 2)
Figure 2 ESQ-1 Metal Exploded View

Checking the Power Supply 13
Figure 3 AC Line Voltage Check Point: 13
Power Supply Measurements 14
Figure 4 Power Supply Voltage Check Points 14
Testing the Power Supply Unloaded V15
Harware Notes (specific to the Metal ESQ-l) 16

Figure 5 Intennirten! Starr-up Problem Modification [7
Section A Replacing the Main Board 18