Brand: KENWOOD
Category: Audio
Document Type: Parts/Service
Language: EN
Parts/Service for KDC-205/205CR
Uploaded: Nov. 21, 2025, 9:17 p.m.
Warranty Information
No explicit warranty period is stated in the manual.
The manual provides detailed information for the Kenwood CD Receivers KDC-205/205CR, KDC-226, KDC-2026, and KDC-3026/3026R. It includes exploded views of the unit and CD mechanism, component descriptions, block diagrams, PC board layouts, adjustment procedures, and a parts list. The service manual is intended for qualified service personnel to understand the circuit operation, perform tests, and carry out repairs or replacements of parts. It details various sections such as the CD Player Unit, Electric Unit, Switch Unit, and Mechanism Control IC, along with their respective terminal descriptions and part numbers for replacement. The document also outlines test modes, specifications, and troubleshooting guidance, emphasizing safety precautions during servicing.
Troubleshooting and error codes
| Ref. No. | Application/Functions | Operation/Condition/Compatibility |
|---|---|---|
| IC1 | LCD driver | LCD derive & Key input interface |
| IC2 | Sensor | Remote control sensor |
| Q1 | Key scan detect | key scan start at base gose "L". |
| Q2 | LED SW | When Q2 base gose "H" LED is light on RED Color |
| Q3 | LED SW | When Q2 base gose "H" LED is light on GREEN Color |
| IC1 | Mechanism control | When BU5V & MSTOP (12pin) goes "H" (IC1 is active) |
| IC2 | SW3.3V AVR | When CNTL (1pin) goes "H" (SW3.3V AVR : ON) |
| IC3 | CD DSP & servo IC | CD RF amp, Servo, DSP & DAC |
| IC4 | BTL driver | Focus, tracking coil, Sled & Spindle motor driver IC |
| Q2 | SW SW transistor | SW5V SW transistor |
| Q3 | APC | Auto Power Control |
| Q4 | SW EQ SW transistor | EQ SW transistor |
| IC1 | System control IC | System control microprocessor |
| IC4 | Audio power IC | Audio power amplifier |
| IC6 | RDS decoder | RDS decoder IC |
| IC7 | Power supply IC | Multi AVR IC (for 5V, 8V, P-CON & P-ANT) |
| IC8 | Muting logic IC | Control for MUTE, P-ANT & RESET muting |
| IC10 | E-VOL & tuner IC | E-VOL. FM/AM tuner & stereo decoder |
| IC11 | Reset IC | When BU5V line voltage is less than 3.5V, this IC output line is "L" |
| IC12 | E2PROM | Memorized tuner adjustment data (save & load) |
| Q10 | BU detector | When the base goes "H" during BU applied (ON) |
| Q20 | ACC detector | When the base goes "H" during ACC applied (ON) |
| Q40 | Muting driver foe Q223, 224 | When the base goes "L" (Muting: ON) |
| Q50 | SW5V | When the base goes "L" (SW5V: ON) |
| Q51 | MS | Control SW for IC7 |
| Q53 | Control SW for SERVO +B | When the base goes "H" (Servo +B : ON) |
| Q55 | SERVO +B AVR | Servo AVR (7.4V) |
| Q70 | Serge detector | When the base goes "H" (Serge detection) |
| Q101 | DSI illumination SW | When the base goes "L" (DSI illumination: ON) |
| Q102 | Panel 5V SW | When the base goes "L" (Panel 5V : ON) |
| Q201 | Noise buffer | Tuner audio noise buffer amplifier |
| Q223,224 | Preout muting SW | When the base goes "H" (Preout muting: ON) |
| Q251 | SW | When the base goes "L" (IC4 : ON) |
| Q252 | Smeter RC & MPTHTC SW | RC & TC is "LONG" when the base is "H" (base is "L" is AF search) |
| Q253 | Smeter RC & MPTHTC SW | When collector is "H", emitter is "H" |
| Q501 | AM RF amplifier | When the base goes "H" (RF circuit gain is up) |
| Q502 | FM RF amplifier | When the base goes "H" (RF circuit gain is up) |
| Q503 | MPX buffer | MPX input buffer with RDS |
| Q221,222 | Audio muting SW | Audio preout is muted when the base goes "H". |
| Q225 | Audio muting driver | Mute driver for audio muting switch. |