Serial Numbers; Required Equipment For Service - QSC K.2 Series Service Manual

1.5 Serial Numbers

Serial numbers on QSC K.2 Series powered loudspeakers are nine digits long. The second
digit represents the month of manufacture, and the third digit represents the year; use
the decoder chart on the right to find the manufacture date. (The first digit is an individual
factory code, and the fourth through ninth digits are the sequential identifying number for
each individual unit.) The K.2 series is manufactured in 2 different factories "V" and "G".
For example, a serial number of VDHxxxxxx would indicate that the product was built at
factory "V" in 04/17, or April 2017.
The unit's serial number can be found on a label near the power inlet.
Important Note: The serial number is also stored in the flash memory on the input/DSP board. The K.2 Updater utility (a
Windows application) can be used to view the serial number. However, if the input/DSP or amplifier module was replaced,
the serial number in flash memory will not match the serial number on the label shipped with the product. Due to this fact,
it's recommended to only use the physical serial number label in reference to the product's warranty. If in doubt, please
contact QSC for further assistance.

1.6 Required equipment for service

Hardware and Software
• Personal computer (PC) running Windows® 7 or newer operating system with available USB2.0 or newer port
• K.2 Updater utility (not always required)
• USB Type A to microUSB cable
Tools required
• Various hand tools for electronic repair, including Phillips (#1, #2, extra long #2), flat (#2) and Hex (#4, 7mm, 9/32")
screwdrivers, putty/butter knife, needle-nose pliers, etc.
• 2.5x or higher magnifier with lamp
• ROHS-compliant (lead-free) soldering iron, desoldering equipment, and solder
Service bench setup
• Custom K.2 series test adapter (for amplifier module bench testing)
• Non-inductive load resistors, configurable as 16Ω (min. 225 watts capacity), as 2Ω (min. 1000 watts capacity).
• XLR male and female cables
• Digital multimeter (DMM) with RMS AC voltage and current
• Oscilloscope (two or more traces, mixed signal, 250 MHz or higher) with digital frequency display
• Balanced signal tone generator, capable of 20 Hz to 20 kHz sine-wave and pink/white noise
• Grounded anti-ESD mat, wrist or ankle strap
6
GDH0T6879
K12.2 ASSEMBLED IN CHINA
VDH0U8796
K10.2 ASSEMBLED IN CHINA
X m y xxxxxx
Month Year
A = Jan G = 2016
B = Feb H = 2017
C = Mar I = 2018
D = Apr J = 2019
E = May K = 2020
F = Jun L = 2021
G = Jul M = 2022
H = Aug N = 2023
I = Sep O = 2024
J = Oct
K = Nov
L = Dec
QSC, LLC