Service Manual 8. VHF (136-174 MHz) Information
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Description of Normal Situations:
1) Voltage at L6001: about 9.1 V.
2) Voltage at L6022: about 5 V.
3) For Q6002, Vbe: about 0.74 V; Vce: about 5.4 V (in the case of no signal reception).
4) For Q6003, Vbe: about 0.76 V; Vce: about 1.4 V; for Q6004, Vbe: about 0.7 V; Vce: about
1.55 V (in the case of no signal reception).
5) Cut off the front-end circuit, and input a 44.85 MHz IF signal at TP6008 to test IF
sensitivity. Normally, the IF sensitivity is -109 dBm.
6) Frequency of Q6006: 47.1 MHz.
7) Frequency of L6039: 18 MHz.
8) Input a -30 dBm RF signal at the antenna connector and test at TP6012. Normally, gain >
11 dB, output signal > -19 dBm.
9) Input a -30 dBm RF signal at the antenna connector and test at R6075 (do not cut off the
back-end circuit). Normally, gain > 1 dB, output signal > -29 dBm.
10) For output signal of C6015, signal frequency: F = RF - IF, signal amplitude > 14 dBm.
11) For input of -80 dBm signal at L6024, gain > 25 dB, output signal > -55 dBm; for input of
-30 dBm signal, output signal < -20 dBm.
12) The input signal at the antenna connector, with the standard tuning information (AF = 1
kHz, FM = 3 kHz), is -47 dBm.
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