This document is about the maintenance manual of Changhong PDT-3 movement, including mechanical disassembly and assembly diagrams, circuit board distribution diagrams, signal flowcharts, and introduction to key circuit components. The movement has various functions and features.
This service manual provides detailed information for repairing the Changhong PDT-3 projector. It includes an overview of the device architecture, circuit board layout, and functional modules, as well as step‑by‑step repair procedures for common faults.
Safety guidelines are emphasized, such as disconnecting power before work, handling high‑voltage components (up to 32 kV), and protecting the projection tube during maintenance. Component locations, part numbers, and replacement instructions are also listed. This manual is written in Chinese.
| Input voltage | 150‑250 V, 30/60 Hz |
|---|---|
| Power consumption (normal operation) | ≈230 W |
| Power consumption (standby) | ≈3 W |
| RF impedance | 75 Ω |
| Color standards | PAL, NTSC, SECAM, PAL60 |
| Audio standards | D, B/G, M, I |
| Video interfaces | RF, AV, S‑Video, PC, YPbPr |
| Projection tube high voltage | 30.5 kV |
| Audio output power | 30 W (15 W + 15 W) |
The manual specifies a supply voltage of 150‑250 V at 30/60 Hz.
High‑power components are on the power board (VQB80, NG821, NG821A) and the driver board (1461, T410, T462, N402, VG04).