Sanyo VM-EX70P Adjustment Manual

5-2-2. Monitor OutputThe input signal selected (microphone input signal only inthe case of PAL) passes through the ALC circuit (23 dB fullgain), fade circuit (fade controlled by the control signal fromPin @J of CN202), mute circuit (during recording, the signalis muted by the system mute signal from Pin @ of CN201 ,and during playback, self-muting is carried out if there isdropout of 500 μs or more), and line amplifier (8 dB gain)and is output ( - 7 dB) from Pin @ [Pin ® ) of IC201 . TheLeh and Reh of the monaural signal are mixed by the mixercircuit inside the IC and output ( - 7 dB) from Pin @) . Theoutput signal from Pin @ [Pin ® ) of IC201 is output fromPin ® [Pin ® ) of CN202 via an analogue switch and passesthrough CP1 , after which it is output to the audio RCAterminal of TB2. The output signal from Pin @) of IC201 isoutput to the remote control DIN terminal of TB2.5-2-3. Recording Signal ProcessingAs mentioned in the previous section, the signal which isoutput from the fade circuit is input to the line amplifier, andalso to the matrix circuit (to generate L + R and L - R). Itthen passes through the noise reduction circuit and the LPemphasis circuit (in the case of PAL, emphasis processingis not carried out), and then FM modulation is carried out(the L + R and L - R signals are modulated to 1 .5 MHz and1 .7 MHz carriers respectively). Then the signal is outputfrom Pin @ of IC201 and is input via Pin @) of CN202 to therecording signal processing circuit of the CP1 circuit board.5-3. PLAYBACK SYSTEMThe playback RF signals have the 1 .5 M Hz and 1 .7 MHzcomponents taken out respectively by the T2001 and T21 01band pass filters, after which they are input to Pins @ and@ of I C201 respectively. After this, they are input to thedemodulator circuit, but the demodulation sensitivity of the1 .5 MHz and 1 .7 MHz signals are adjusted by VR201 andVR21 1 respectively.The demodulated signals (1 .5 MHz and 1 .7 MHz aredemodulated to the L + R and L - R signals respectively)pass through a hold circuit (held just before head switchover and dropout generation), after which they pass throughthe LP emphasis circuit, noise reduction circuit, matrixcircuit (L and R signals are generated from the L + R and LR signals) and then the mute circuit (in the reverse order tothe recording system), and are then output to the lineamplifier. After this, the process is the same as for therecording system.- 4-30 -