Parts/Service for PD-7050

Name: Parts/Service for PD-7050
Brand: PIONEER
Availability: InStock

Brand: PIONEER

Category: Audio Player

Document Type: Parts/Service

Language: EN

Uploaded: Nov. 21, 2025, 9:03 p.m.

Manual Publish Date: 1987-03-01

Chapter 1 provides IC data for various models, detailing pin functions and descriptions for PD3091A, PD3092A, and PD3093A.
Chapter 2 explains the optical path in the pick-up, describing the laser diode, objective lens, half mirror, and actuator. It also details the RF and servo signals and how they are detected.
Chapter 3 presents a block diagram for the PD-7050, illustrating the interconnection of various components like the pick-up assembly, RF amplifier, digital out circuit, system control, and power supply.
Chapter 4 dives into circuit descriptions, including the Accurate Focus Servo System, CXA1082AS IC descriptions, Tracking and Carriage Servo System, Spindle Servo, and VCO Loop Filter.
Further sections cover the Demodulator, Digital Level Control, TOC Reading, Carriage Servo System, and various signal processing circuits like RF AMP, Focus Error Amp, Tracking Error Amp, Focus OK Circuit, Mirror Circuit, EFM Comparator, Defect Circuit, and the auto sequence.

Troubleshooting and error codes

No	SYMBOL	NAME	I/O	OPERATING DESCRIPTION
1	Vss	---	---	GND
2	RES	REST	I	CPU RESET input
3	INT	SCOR	I	SUBCODE SYNC input
4	STBY	---	I	+5V (CPU Standby input)
5	XTAL	---	---	Internal Clock Circuit input
6	EXTAL	---	---	Internal Clock Circuit input
7	NUM	---	---	GND (for manufacturer's use)
8	TIMER	I	Not used	(Connected to SEMS)
9	A7	TEST	I	TEST Mode Select input
10	A6	ALAT	O	Attenuation Level Latch Pulse output
11	A5	ADAT	O	Attenuation Level data
12	A4	ACLK	O	Attenuation Level clock
13	A3	SRES	O	Key-Display Microcomputer RESET output
14	A2	XLT	O	LSI Control Data RUN Pulse output
15	A1	Not used	O	(OPEN)
16	A0	Not used	O	(OPEN)
17	B7	CLMP	I	Disc CLAMPed SW input
18	B6	OPEN	I	Disc Tray OPENed SW input
19	B5	INSD	I	Slider Inside SW input
20	B4	SENS	I	LSI Operating Status Multi-Mode input
21	B3	CPCF	I	SUBCODE Q-CRC Result input
22	B2	GFS	I	FRAME SYNC Lock input
23	B1	Not used	I	Connected to GND