Kenwood KVT-910DVD Service Manual
Also see for KVT-920DVD: Instruction manual
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KVT-910DVD/920DVD/930DVD/940DVD/960DVD52ADJUSTMENTX86 Circuit Adjustment Specification (M, X, C type)Item Adjustment Method & Value Condition1. Adjustment of imagedetection coilL1032. Adjustment of audiodetection coiL1013. S-METERadjustmentVR1024. RF AGC adjustmentVR1015. Duversuty free-runfrequencyVR11. Turn VR101 [RF-AGC] counter-clockwise as much aspossible.2. Impress DC2.0V to TP [IF AGC] (#36 of IC101).3. Input fo=38.0MHz Mod=1kHz AM60% Level=100dBμ toTP[IF] (#1 of CF1).4. Observe the waveform of TP [VIDEO] (#8 of IC101) with anoscilloscope and adjust L103 so that output level will be themaximum.1. Turn VR101 [RF-AGC] counter-clockwise as much aspossible.2. Input fo=31.5MHz non-modulated Level=94dBμ to TP [IF](#1 of CF1).3. Connect voltmeter to TP [SIF] (both ends of R107) andadjust L101 so that 0V ± 0.01V is achieved.1. Turn VR101 [RF-AGC] clockwise as much as possible.2. Input RF signal 30dBμ CHINA 9CH color bar to the ANTinput terminal.3. Audio (P/S ratio-6dB) non-modulated4. Adjust VR102 [SMET] to 3.5V ± 0.05V, by connecting avoltmeter to CN5.5. Set RF signal to 70dBμ and adjust VR101 [RF-AGC] sothat the value of the voltmeter connected to CN3 is 4.8V ±0.05V.1. Connect a frequency counter to PIN 1 of CN5 [#7 of IC2].2. Connect Pin 3 of CN5 [#8 of IC2] and PIN2 [GND].3. Adjust VR1 [15kHz] and set to 15625Hz ± 100Hz• ANT non-signal• If the waveform isclipped, raise DCvoltage somewhat.• AC range• ANT non-signal• Slide VR5 so thatAGC will not beeffective at 30dBμ.• Be sure to adjust S-METER beforeadjusting RFAGC.• ANT non-signalMaximu |
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