Multitone RPR 563, Инструкция по изменению

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RPR 563
TM1195 Issue 1 Page 5 - 18
STEP TEST POINT REMARKS
1 TR110(e) B+ 3.6V DC
2 TR110(c) SWB+ 3.6V DC
3 TR131(c) 1.64V DC
4 TR108(c) 4.5V 5.0V ±0.5V
5 IC101 PIN 33 3.3V - 4.3V DC
6 IC106 PIN 2 SPEECH3V AUDIO CIRCUIT 3.6V
7 IC105 PIN 3 CLK GATE ARRAY CLOCK 32.768kHz
8 IC105 PIN 5 RESB 0 - 3.6V SWITCH ON
9 IC105 PIN 76 SCK INTERRUPT 120µs PULSE
10 IC105 PIN 68 TMI 120µs
9
EVERY 2s
11 IC105 PIN 67 SW1 SWITCH ACTIVITY
9
12 IC101 PIN 38 XL102 µP CLOCK (EVERY 60ms) 3.58MHz
13 IC105 PIN 26 E TRANSFERS DATA
9
14 IC105 PIN 9 BEC `0' ENABLES RADIO
15 IC105 PIN 42 TSF TONE `ON' ICON
NOTE:
9
= Falling edge of output signal.
Measurements are made with x10 oscilloscope probe.
Table 3: Decoder Circuit Detailed Test Sequence
Decoder Faults
17. If the Decoder PCB is suspect, proceed as follows:
a) Remove the case back.
b) Separate the two PCBs and connect them via the 14-way lead (supplied with the
P665).
c) Place the two PCBs on an anti-static mat. Connect a fully-charged battery pack and
switch on.
d) With a x10 probe connected to the oscilloscope, measure points 1 to 15 in Table 3.
e) Compare the resultant waveforms with those in Figure 11.
NOTE: It will be necessary to remove the Decoder PCB screen to gain access to
test points.