SERVICE INSTRUCTIONS3. Add the following components to the PC board assembly at
the locations indicated by the highlighted parts in the
For radios that require an open circuit when the microphone is
dash-line parts in Figure 5 and photo in Figure 6.
on-hook (such as many Ericsson/GE models), the hang-up logic
can be reversed by the following procedure.? NPN Transistor Q2 (Shure Part No. 86A350; Motorola
2N5210)
1. Open the microphone case by removing three retaining
1
? Resistor R5, 56 k&, / W (Shure Part No. 45LA563C)
screws.4
4. Unsolder and move the blue wire from W5 to W4.
2. Carefully separate the case halves, taking care not to lose the
rubber pieces associated with the cartridge assembly.
W4W8W5
HANG-UP BUTTON
BLUJUMPER
(INSTALLED)
SP2
86A434
J1
1
W32AUDIO OUT/DC BIAS
PTT HI
C1C23HANGUP
WHT120pF.001?FR24PTT LO
R15
68KN/C
10K6
GND
3
W2C7Q1
2
CARTRIDGE
.018?FC4C386A350
1
SP1.001?F120pF
C5C6R3
86B434R
.001?F120pF27K
W1R6
GND51
R4
470
C8 +
10?FYELBLK
W6W7
CIRCUIT DIAGRAM
FIGURE 5
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