Sunday, February 08, 2015

HARMAN KARDON SUB-TS7 SUB-TS8 SUB WOOFER SCHEMATIC AND ALIGNMENT

SUB WOOFER SCHEMATIC AND ALIGNMENT 

Test Set Up and Procedure
Equipment needed:
#
Function/signal generator/sweep generator
# Integrated Amplifier
# Multimeter
# Speaker cables
Initial Control Settings:
# Power Switch OFF; Filter OFF
# Level MIN (Full CCW)
# Phase, Auto/On switches do not matter
General Unit Function (UUT = Unit Under Test)
1) From the signal generator, connect one line level (RCA) cable to the Subwoofer Line Level Input jacks L/R on the UUT. Use a Y-cable from a mono source if necessary to connect to both inputs. Do not connect to the single, purple SUB input.
2) Turn on generator; adjust to 75mV, 50 Hz.
3) Plug in UUT; turn the power switch ON. Turn LEVEL control full clockwise (MAX)
4) LED should turn from Amber to Blue (on top of UUT); immediate and vigorous bass response should be heard and felt from port tube opening.
5) Turn off generator, turn LEVEL control full counterclockwise (MIN), and disconnect RCA cable.
6) Connect one pair of speaker cables to Speaker Level input terminal (IN) on UUT. Cables should be connected to an integrated amplifier fed by the signal generator.
7) Turn on generator and adjust so that speaker level input at the amplifier is 1.6V, 50 Hz. Turn LEVEL control full clockwise.
8) LED should turn from Amber to Blue; immediate and vigorous bass response should be heard and felt from the port tube opening.
Sweep Function
1) Follow steps 6-8 above, using a sweep generator as a signal source.
2) Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or
any other noises. If any unusual noises are heard, remove woofers and test.
Driver Function
1) Remove woofer from cabinet; detach + and - wire clips.
2) Check DC resistance of woofer; it should be 3.0 ohms +/-10%
3) Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 5.0V.
4) Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
Improved filter performance                                                                             
Change four 1/6W +/-5% CF Resistors in the PREAMP PCB of the HKTS 7 subwoofer amplifier. It is recommended this procedure be followed for every unit that has to be serviced, for any reason.
Designator
Original value
New value
h/k part number
R223
51kOhm
30kOhm
110-16303J26

R224
51kOhm
30kOhm
R226
27kOhm
10kOhm
110-16103j26
R227
27kOhm
12kOhm
110-16123j26
SCHEMATIC DIAGRAM 

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