Power Supply +5Vdc Voltage Adjustment Procedures - Bose ControlSpace ESP-88 Service Manual

DC Power Supply +5V Adjustment Procedures
Integrated Power Devices (IPD) Power Supply +5VDC Voltage Adjustment Procedure
CAUTION: Dangerous voltages are present when the chassis is powered up and the top cover is
off. Use care when performing the below procedure.
Note: This procedure is to be performed on ESP-88 / ESP-88C chassis using the IPD power supply
only. The power supply is labeled with the name of the manufacturer on the side of the supply.
Note: The IPD power supply is set to +5Vdc at the
factory. The ESP-88 and ESP-88C chassis requires
+5.2Vdc to operate properly. Measure the DC voltage
level using the following procedure. Adjust the 5 volt
level if needed.
1. Remove the chassis top cover. Check to see if the
chassis is using the original wiring harness. The original
wiring harness uses a translucent body connector at the
DC power supply end. The upgraded harnesses use a
solid white connector. The examples shown at right are
for units with the IPD supply.
If the wiring harness connector has a translucent plastic
body, unplug it from the power supply and motherboard
®
and discard it. Install the upgraded harness Bose part
number 318938-001S.
Astec Power Supply
Note: The wiring harnesses for the IPD and Astec
supplies are NOT interchangeable. They have different
wiring connections. Be sure to use the correct harness
for your chassis.
2. With the top cover removed and AC mains voltage
applied, measure the +5Vdc level at the DC output
connector on the power supply. Place the positive (+)
probe on the red wire at the pin 1 location. Place the
negative (-) probe on the black wire at the pin 2 location.
If the DC voltage level reads less than +5.2Vdc, adjust
the +5 Volt potentiometer clockwise until the meter
reads +5.2Vdc.
3. Turn off AC mains to the chassis.
4. Replace the top cover.
105