Ensoniq esq 1 esq m service manual

Page 2

INTRODUCTION

As with every ENSONIQ product. all ESQ-1 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-1 with a Plastic Case. You can
use the following criteria to determine which case is which:

smug. W W
METAL 10000 - 24999 40900004001 NO HEAT SINK ON BACK
PLASTIC 25000 - HIGHER 40900007001 HEAT SINK ON BACK

There are no interchangeable parts 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-I only (Section 3) and the ESQ-M (Section 4).

TABLE OF CONTENTS
Figure I ESQ-l Front Panel Controls

METAL AND PLASTIC ESQ-1 (Sectlon 1)
Internal memory
ESQ-l Test Procedure ,
; 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

11. Filter Tune

12. Sound Test

13. MIDI Test

14. Re-initialization 0f ESQ-l

15. Hard Reset
Using Self-Test Mode to Diagnose Display Assemblies
Software Notes 0.8. 1.7 thru 0.8. 3.5
Hardware Notes
Battery Low Message
System Error Message
Flowchart - Troubleshooting an ESQ-l with a Blank Display

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

owseveww-

~ocmumduuuuAAAuumeNNMN

Checking the Power Supply 13
Figure 3 AC Line Voltage Check Points 13
Power Supply Measurements 14
Figure 4 Power Supply Voltage Check Point: 14
Testing the Power Supply Unloaded _15
Harware Notes (specific to the Metal ESQ- I) 16

Figure 5 Intermittent Starr-up Problem Modb't'carion 17
Section A Replacing the Main Board 18