Service Bulletin
Service Bulletin INF2002-05 Rev5 - October 2005
Warranty labor rate: MAJOR repair
To: All Infinity Service Centers
Model: Interlude IL50
Subject: Reliability Upgrade
PURPOSE: Improve reliability of the IL50 amplifier; this procedure should be followed for every unit that
has to be serviced, for any reason.
PLEASE READ ENTIRE PROCEDURE FIRST BEFORE ORDERING PARTS OR SERVICING THE AMPLIFIER.
SOME PART REPLACEMENTS ARE AS NEEDED BASIS
ONLY; SEE SHADED AREAS IN CHART BELOW.
IR = Brand International Rectifier A/R = As required
Infinity Part
Number
Ref.
Designator
Description Qty Comment
QM0061 Q1 MOSFET, IRF540 TO220AB IR ONLY 1 As Needed
QM0055 Q4,Q5 MOSFET, IRF740 TO220AB IR ONLY 2 As Needed
TS0016 TUBING, #5 BLACK CUT TO .3 A/R
DR0091 D1
RECT, 15A 200V MUR1540 MOTOROLA ONLY
1
As Needed
810066
HEATSINK, FET CLIP, CLIP ON - NO
SCREW
2
Used with heatsink
810156 on U2,U3
810156 HEATSINK, LINEAR VOLTAGE REG 1
810157 HEATSINK, FET SEC BLACK 1 Replaces 810091
810158 HEATSINK, FET PRIMARY BLACK 1 Replaces 810092
810056 HEATSINK, FET CLIP .9 x .5 x .2 1 Use with Q1
MS0017
MISC, CERAMIC PLATE TO-220,
CERAMIC INSULATOR 0.025
5 Use with Q1,3,4,7,8
Thermal grease A/R
Use with Q1,3,4,5,7,8,
D1,D3
RM0002 R43 RES, MF 10K0 1/4W 1% 1 Replace
KS0027 50 DEGREE PTC THERMISTOR 1 Add
RTV DOW CORNING 747 OR
EQUIVALENT
A/R
CE0145 C6 CAP, E 1000uF 100V 18 x 40 105C 1
To replace 85 deg.
part
TS0009 HEATSHRINK TUBING 1/16” DIA. A/R For KS0027 leads
CC0040 C11 CAP 0.0047µF 100v 10% 1 As Needed
RX0109 R1, R2 0.1 Ω RES MO, 2W 5% METAL FILM 2 As Needed
QB0014 Q6 MPSA92 PNP TO92 TRANS 1 As Needed
293-100K R22 100KΩ 1/2W RES CF 5% 1 As Needed
KS0020 R26 SURGISTOR 10R 2A CL-110 (13S100L) 1 As Needed
RC0136 R30 RES, CF 160K 1/4W 5% 1 As Needed
RC0273 RES, ZERO OHM 1/4W 1
MS0005 SILPAD, .009" .3C/W TO3P 1
The repair procedure is to be executed in 3 phases.
1) POWER SUPPLY BOARD UPGRADE - THESE STEPS CORRESPOND WITH FIGURE 1
Step OPERATION
1.
Q1 - This part must be IR only. Replace with QM0061, MOSFET, IRF540 TO220AB IR if needed. Use
TUBING, #5 BLACK cut to .3 (TS0016) to set mounting height to 0.3”.
IL50
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