Toshiba FT-3808BK, Service Manual

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3. Handset unit :
3.1 Test equipment required and connection.
3.2 Preparation from alignment
Place the H/S Board into test mode, disconnect microphone wire at H/S Board and
set the volume to “L” position.
3.3. Alignment procedure :
Step Preset Adjustment Remark
1 H/S Board into test
mode
---
Connect the digital voltmeter to the PCB test point
RX-Loop-V. The reading should > 0.25V DC and
< 2.45V DC.
2 H/S Board into test
mode
---
Connect the digital voltmeter to test point TX-
Loop -V. The reading should > 0.25V DC and <
2.45V DC.
3 H/S Board into test
mode HC92 Connect the digital voltmeter to test point RX-A.
Adjust for 1.17VDC at CH6.
4 H/S Board into test
mode HC87 Connect the Frequency counter to test point ANT.
Adjust for 926.55MHz at CH6.
5 Audio Gen : 1KHz,
-20dB (NO Load) HR113 Connect the VTVM to test point REC + Adjust for
-35dB
6 Audio Gen : 1KHz,
-40dB (NO Load) HR119 Connect the VTVM to test point TX Audio.
Adjust for -16dB.
Digital Voltmeter
RX -Loop-V TX-Loop-V RX-Audio
MIC IN / Handset unit
RX Audio (RF & Audio Board)
TX Audio / REC +
Batt. ANT
Audio
Generator
VTVM
DC
3.6V
Frequency
Counter