8525B/8528 Technical Service Manual Maintenance 6-5
Publication No: 15-02036 Issue 6
6.2.2 Voltage Measurement
The circuit diagrams and the relevant circuit notes give voltages at various
points under the various conditions to enable the faulty section of the
transceiver to be located.
The parameters listed below should always be checked first:
1. Supply voltages on the Motherboard and Chassis:
• Main B rail regulator (IC1) 10V ±0.2V
• C rail, B rail voltage in Receive, 0V in Transmit,
• D rail, 0V in Receive, B rail voltage in Transmit,
• Main 5V regulator (IC2) 5V ±0.4V.
2. Supply voltages on the RF Mixer and Dual Synthesizer PCB:
• +5V supply (IC4) 5V ±0.4V
• +26V supply (TP7) 26V ±1V
• +9V supply (V1 emitter) 9V ±0.25V
3. Supply voltage on the Microphone Amplifier and Interface PCB in the
Control Head: 5V regulator (IC1) 5V ±0.4V.
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