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故障一不挂机原因:1.压敏电阻RV坏。2.V_7(MPSA92)坏。3.V_8(MPSA42)坏。4.V_(26)(8550)坏。故障二不拨号原因:1.拨号集成块N_1(91340A)坏。2.其外围电路电容C_5、C_6坏。3.开关管V_(13)(9014)坏。
Failure does not hang up a reason: 1. Varistor RV is bad. 2.V_7 (MPSA92) bad. 3.V_8 (MPSA42) bad. 4.V_ (26) (8550) bad. Failure two do not dial reason: 1. Dial-up manifold N_1 (91340A) is bad. 2. Its peripheral circuit capacitance C_5, C_6 bad. 3. Switch V_ (13) (9014) is bad.