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录音部份本机录音与放音前置放大使用同一个集成电路2JC1(D7668AP)。录音状态时,2K_(1-3)处于位置2,2C_(15)、2R_(18)接到2JC1的脚⑧,ALC 电路开始工作,控制左右两路的录音电平。该电路一旦损坏,即造成录音失真、自激等故障。录音部分还包括偏磁振荡电路,这部分损坏对录音质量有很大影响。现将录音故障简述如下。(一)录音无效1.内外录音均无效:录音键下方的塑料压板未装好,在录音时录放开关没有压下,仍处在放音状态。重新装好压板,使之处在录音键弹簧铜片的下方与录放开关的上方,录音即恢复正常。录放磁头的引出线
The recording part uses the same integrated circuit 2JC1 (D7668AP) for local recording and playback. Recording state, 2K_ (1-3) in the position 2, 2C_ (15), 2R_ (18) received 2JC1 feet ⑧, ALC circuit to work to control the left and right recording levels. Once the circuit is damaged, that caused the recording distortion, self-excited and other failures. Recording part also includes bias magnetic circuit, this part of the damage on the recording quality has a great impact. Recording fault is now outlined below. (A) recording is invalid 1. Internal and external recording are invalid: the recording button below the plastic platen is not installed, the recording switch did not press the recording, still in playback state. Re-install the pressure plate, so that the recording button below the copper spring and recording switch above, the recording is back to normal. Recorded head of the lead