DD-20(T) Mar.2003 SERVICE NOTES Issued by RJA TABLE OF CONTENTS SPECIFICATIONS.............................................................2 LOCATION OF CONTROLS ..........................................4 LOCATION OF CONTROLS PARTS LIST ...................5 EXPLODED VIEW ............................................................6 EXPLODED VIEW PARTS LIST .....................................9 PARTS LIST......................................................................
Mar.
DD-20(T) 3
Mar.2003 LOCATION OF CONTROLS fig.
DD-20(T) LOCATION OF CONTROLS PARTS LIST No.
Mar.2003 EXPLODED VIEW FIG.
DD-20(T) BG223 b 21 27 k c 20 m 44 29 n 43 33 28 23 32 32 22 30 24 31 b 45 45 26 1 1 f e 25 7
Mar.2003 fig.
DD-20(T) EXPLODED VIEW PARTS LIST [PARTS] No.
Mar.2003 PARTS LIST fig.part1e SAFETY PRECAUTIONS: The parts marked have safety-related characteristics. Use only listed parts for replacement. CONSIDERATION ON PARTS ORDRING When ordering any parts listed in the parts list, please specify the following items in the order sheet. QTY PART NUMBER DESCRIPTION MODEL NUMBER Ex.
DD-20(T) TRANSISTOR 15319107 15329521 # F5329536 15329103 F5329530 # F5119901 DIODE # # 2SC4116-GR(TE85R) RN1307(TE85R) CPH6302 2SK880GR-TE85R 2SK879Y RN1207-TE85R TRANSISTOR TRANSISTOR POWER MOS FET FET TRANSISTOR FET DIGITAL TRANSISTOR Q9,Q10,Q11,Q12,Q13,Q14,Q15 on Jack Q7 on Jack Q17 on Jack Q1,Q5 on Jack Q2,Q3,Q4,Q6,Q8 on Jack Q1 on panel 7 1 1 2 5 1 15019523CH 15019126 F5029126 1502928100 RD 5.
Mar.2003 CAPACITOR 15359701 # # CERAMIC CAPACITOR ECUV1H104ZF CHIP CAPACITOR 00239601 13629624S0 02891767 0.1U/50V 6SC10M+T (OS) 6.
DD-20(T) PACKING G2237613 G2237614 REAR PAD SIDE PAD MISCELLANEOUS G2357115 H2369450 2217710900 2215770201 G2257130 G2177308 G2177307 G2177309 G2357111 G2257129 G2197126 # H2369429 # G2537731 # G224780201 PEDAL FOOT LED SPACER COIL SPRING PEDAL GUIDE BUSH BATTERY INSULATING SHEET BATTERY TERMINAL(+) BATTERY TERMINAL(+-) BATTERY TERMINAL(-) CUSHION R INSULATING SHEET CENTER LED GUIDE LED SPACER 3-9 QUICK MANUAL LABEL DIFFUSION SHEET ACCESSORIES (Standard) G601730301 # G6017365 # G6017366 # ******** IMPO
Mar.2003 CHECKING THE VERSION NUMBER 1. Turn all volume controls completely to the left. 2. While holding down the left pedal’s ON/OFF and the right pedal’s TAP/ MEMORY, connect the AC ADAPTOR to the ADAPTOR jack (which turns on the power). 3. Only the POWER LED lights up. 4. Release the left and right pedals. 5. Within four seconds, press the left pedal and the right pedal, in that order. 6. The unit switches to Test mode, and all of the LEDs light up or flash. 7.
DD-20(T) Entering Test Mode Detailed Test Items 1. 1. Connect standard audio (mono) cables to all of the INPUT A(MONO) and B jacks and OUTPUT A(MONO) and B jacks, and connect a stereo/ monaural converter cable (PCS-31 or similar) to the CTL jack. Connect the other ends to the two FS-5U foot switches, and set the “POLARITY” switch on the FS-5Us towards the FS-5U jacks. 2. Turn all volume controls completely to the left (to minimum). 3.
Mar.2003 fig.1 If the LCD display does not change even after the [TAP] switch is pressed, confirm that all of the cables are connected to the jacks and the FS-5U “POLARITY” switches are set correctly as described in “1” in “Entering Test Mode.
DD-20(T) • Press the [TEMPO] switch. Confirm that the characters light up and go off in the sequence shown below. fig.2 • Press the [WRITE] switch. Confirm that the notes light up and go off in the sequence shown below. fig.3 • Press the [SELECT] switch. Confirm that the entire LCD is on and that all of the LEDs are lit.
Mar.2003 fig.5 Nothing will appear in the display if the right channel’s FS-5U is pressed before the one connected to the left channel. 3. VR, Encoder Check • Set the MODE control to “TWIST.” “2” appears in the LCD. • Input a sine wave (200 Hz, 16Vp-p) from the oscillator to INPUT A(MONO) and B. • Connect the oscilloscope to OUTPUT A(MONO) and B. • Rotate the E.LEVEL volume from the far left (minimum) to far right (maximum).
DD-20(T) fig.7 fig.9 (200 mV/DIV, 1 mS/DIV) (5V/DIV, 1 mS/DIV) 5. 6. ANALOG BYPASS Check (includes INPUT B jack detection check) MUTE Check • Set the MODE control to “TAPE.” “4” appears in the LCD. • Set the MODE control to “ANALOG.” “5” appears in the LCD. • Input a sine wave (200 Hz, 16Vp-p) from the oscillator to INPUT A(MONO) and B. • Input a sine wave (200 Hz, 16Vp-p) from the oscillator to INPUT A(MONO) and B. • Connect the oscilloscope to OUTPUT A(MONO) and B.
Mar.2003 fig.11 Executing Factory Reset results in the loss of all data saved by the user. If Factory Reset is not required, turn off the power to quit Test mode. Factory Reset may be run without entering Test mode. To run Factory Reset only, refer to “Instructions for Running Factory Reset” in these service notes. • Following the “MODE Volume Operational Check,” rotate MODE from “SOS” to “STANDARD.” • ”FAct” appears in the LCD, and the “1,” “2,” “3,” and “4” LEDs flash. • Press the [WRITE] button.
DD-20(T) that the unit produces no unusual noise. • Connect a monitor speaker to OUTPUT B. Connect the open plug to OUTPUT A(MONO). • Shock-test the unit by dropping it from a height of 10 cm, then confirm that the unit produces no unusual noise. • Connect a monitor speaker to OUTPUT A(MONO). Connect the open plug to OUTPUT B. • Shock-test the unit by dropping it from a height of 10 cm, then confirm that the unit produces no unusual noise. • Rotate F.
DD-20(T) Mar.2003 BLOCK DIAGRAM fig.block INPUT A (MONO) BUFFER Q1 BUFFER (INV) IC1B FET SW Q2 DE EMPH/ LEVEL CTL IC5A/IC18D PRE EMPH/ LEVEL CTL IC3B/IC18A CODEC AD/DA IC6 INPUT B BUFFER Q5 (JK IN/NO INPUT) MIXER IC4A OUTPUT B (JK IN/NO INPUT) RESET IC7 +9V +23V RIPPLE FILTER Q15 DC-DC CONVERTER (STEP DOWN) IC12,Q17 LOGIC IC15B,C EEPROM IC10 TR Q7 (JK IN/NO INPUT) TR Q9 CTL CPU IC8 LOGIC IC15A DSP IC9 SDRAM IC16 +3.
Mar.2003 CIRCUIT BOARD (JK-A) fig.
DD-20(T) CIRCUIT BOARD (JK-B) fig.
Mar.2003 CIRCUIT BOARD (PANEL-A) fig.
DD-20(T) CIRCUIT BOARD (PANEL-B) fig.
DD-20(T) Mar.2003 CIRCUIT DIAGRAM (JACK) fig.C-JK +8.6V C3 100p R2 47k C8 10/35 C118 10/35 R119 10k R24 8.2k 2 6 5 - 3 R40 47k C26 10/16 10/16 1 2 IN-B + C124 N.I.U AD DA LRCK MCLK BCLK PD C27 0.1 6 7 8 9 10 11 12 13 LIN 16 ROUT 15 DEMO DEM1 SDTO SDTI LRCK MCLK BCLK PDN C137 1/50 79 73 64 59 56 49 38 33 24 23 14 7 53015-0210 D +3. 3 R76 miniSMDC075 R78 680uH 1k IC11 8 CD CS 7 IPK ES 6 JK6 KM02009BB VCC VIN- C83 100/16 1 2 3 4 GND CT Q15 2SC4116GR 3 R79 4.
DD-20(T) Mar.2003 CIRCUIT DIAGRAM(PANEL) 4 LED14 CN2-16 D2 1SS133 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 +9V 2 +9V 3 AGND 4 DGND 5 DGND 6 DGND 7 D+3.3V 8 D+3.3V 9 ENC-B 10 ENC_GND 11 ENC-A 12 ENC_SW 13 ENC_GND 14 LED_CLK 15 LED_DATA 16 TEMPO_BLU CN1 A2001WR2-16P 30 36 35 34 33 32 31 30 29 28 27 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG12 SEG11 SEG10 SEG13 VDD OSC2 OSC1 7 2 1 V1 V2 4 3 R12 1k R16 470k C1 0.
Mar.
