JVC HM-DH30000U Service Manual

Also see for HM-DH30000U - D-VHS HDTV Digital Recorder: Instructions Service manual

Contents

3-6Signal (A) • RF signal(Audio: L-ch 300 Hz 14% modulated)Mode (B) • Tuner• EEEquipment (C) • Audio level meterMeasuring point (D) • IC6501 pin 26EVR mode (F1) • Jig code “57”EVR address (F2) • A : 23(F3) • Jig code “22” and “23”(F4) • Jig code “18” or “19” (Channel +/-)Specified value (G) • Minimum levelAdjustment tool (H) • Jig RCU [PTU94023B](1) Set an audio signal mode of the RF signal generator toalternate L-ch 300 Hz 14% modulated.(2) Connect the equipment (C) to the measuring point (D).(3) Set the VCR to the EVR mode by transmitting the code(F1) from the Jig RCU.(4) Set the EVR address to (F2) by transmitting the code (F3)from the Jig RCU.(5) Transmit the code (F4) from the Jig RCU to adjust so thatthe level of the measuring point (D) becomes the speci-fied value (G).(6) Release the EVR mode of the VCR by transmitting thecode (F1) from the Jig RCU again. (When the EVR modeis released, the adjusted data is memorized.)3.5.4 Separation - 1Signal (A) • RF signal(Audio: L-ch 5 kHz 14% modulated)Mode (B) • Tuner• EEEquipment (C) • Audio level meterMeasuring point (D) • IC6501 pin 26EVR mode (F1) • Jig code “57”EVR address (F2) • A : 24(F3) • Jig code “22” and “24”(F4) • Jig code “18” or “19” (Channel +/-)Specified value (G) • Minimum levelAdjustment tool (H) • Jig RCU [PTU94023B](1) Set an audio signal mode of the RF signal generator toalternate L-ch 5 kHz 14% modulated.(2) Connect the equipment (C) to the measuring point (D).(3) Set the VCR to the EVR mode by transmitting the code(F1) from the Jig RCU.(4) Set the EVR address to (F2) by transmitting the code (F3)from the Jig RCU.(5) Transmit the code (F4) from the Jig RCU to adjust so thatthe level of the measuring point(D) becomes the speci-fied value (G).(6) Release the EVR mode of the VCR by transmitting thecode (F1) from the Jig RCU again. (When the EVR modeis released, the adjusted data is memorized.)3.5.5 Separation - 2Signal (A) • No. signalMode (B) • Tuner• EEEquipment (C) • Frequency counterMeasuring point (D1) • IC6501 pin 26Short point (D2) • C6505 (–) terminalEVR mode (F1) • Jig code “57”EVR address (F2) • A : 25(F3) • Jig code “22” and “25”(F4) • Jig code “18” or “19” (Channel +/-)Specified value (G) • 78.67 ± 0.5 kHzAdjustment tool (H) • Jig RCU [PTU94023B](1) Connect the short wire between the short point (D2) andthe GND (Ground).(2) Connect the equipment (C) to the measuring point (D1).(3) Set the VCR to the EVR mode by transmitting the code(F1) from the Jig RCU.(4) Set the EVR address to (F2) by transmitting the code (F3)from the Jig RCU.(5) Transmit the code (F4) from the Jig RCU to adjust so thatthe frequency of the measuring point (D1) becomes thespecified value (G).(6) Release the EVR mode of the VCR by transmitting thecode (F1) from the Jig RCU again. (When the EVR modeis released, the adjusted data is memorized.)(7) Disconnect the short wire between the short point (D2)and the GND (Ground).3.5.6 SAP VCO(1) Insert the cassette tape (A3) to enter the mode (B1).(2) Apply the external trigger signal to D.FF (E) to observethe waveform appeared at the measuring point (D).(3) Set the VCR to the EVR mode by transmitting the code(F1) from the Jig RCU.(4) Set the EVR address to (F2) by transmitting the code (F3)from the Jig RCU.(5) Transmit the code (F4) from the Jig RCU to adjust so thatthe waveform signal level “a” becomes the specified value(G).3.6 Digital circuit3.6.1 D-VHS REC levelSignal (A1) • Ext. input(A2) • Optional(A3) • DF-300Mode (B1) • D-VHS STD REC(B2) • D-VHS HS RECEquipment (C) • OscilloscopeMeasuring point (D) (STD) • TP601 (REC LEVEL1)(HS) • TP602 (REC LEVEL2)External trigger (E) (STD) • TP111 (VIDEO/STD/HS1 FF)(HS) • TP112 (A/HS2 FF)EVR mode (F1) • Jig code “57”EVR address (F2) (STD) • A:08(HS) • A:09(F3) (STD) • Jig code “20” and “28”(HS) • Jig code “20” and “29”(F4) • Jig code “18” or “19” (Channel +/-)Specified value (G) • 100 (105-110) mVp-pAdjustment tool (H) • Jig RCU [PTU94023B]www.freeservicemanuals.info29/11/2016Published in Heiloo Holland