Sega Game Gear TV Tuner PAL Service Manual
The Service Manual for the TV Tuner Pack (PAL) for Game Gear is a 36-page service manual for the Game Gear TV Tuner, which plugs into the Game Gear's cartridge slot. The scan has a text layer. The manual names no publisher; its parts list gives Sega as the maker of the case parts, and its part codes (A01-, W22-, A86-) do not follow Sega's own numbering. It covers three PAL models: MK-2101-05 (system I, England), MK-2101-18 (B/G, Germany) and MK-2101-20 (B/G, general Europe).
The general specifications on the first page give reception of VHF channels 1 to 12 and UHF 21 to 69, operation from +5 °C to +40 °C, storage from −20 °C to +60 °C, dimensions of 107.2 (H) × 120 (W) × 39 (D) mm and a weight of 140 g without batteries.
Contents
[edit | edit source]| Section | Page |
|---|---|
| Specifications | 1 |
| Disassembly and assembly procedure | 4 |
| Block diagram | 6 |
| Adjustment and alignment: general description | 7 |
| 1. System voltage inspection (PCB-2) | 8 |
| 2. Video IF alignment and AFT alignment (PCB-2) | 9 |
| 3. RF AGC delay alignment (PCB-2) | 10 |
| 4. Tuning dial calibration (PCB-2) | 11 |
| 5. Gradation alignment and brightness alignment (PCB-1) | 12 |
| 6. PLL alignment (PCB-1) | 13 |
| 7. RGB phase alignment | 14 |
| Troubleshooting chart and check charts | 15 |
| PCB top and bottom views | 23 |
| Electrical parts list | 31 |
| Exploded view parts list | 36 |
| Exploded view | 37 |
| Schematic diagrams, PCB-1 and PCB-2 | 39 |
What this manual settles
[edit | edit source]- The tuner has two boards: PCB-1, the video board, and PCB-2, the TV receiver board, joined by a flexible flat cable to connector K401. Capacitor and resistor designators are grouped by circuit block, 1xx, 2xx and 4xx on PCB-2 and 7xx and 8xx on PCB-1.
- Sega says the adjustments are needed only after particular components have been replaced, and lists the control for each: L201 and L202 for video IF and AFT, VR201 and VR202 for RF AGC delay, VR1 to VR4 for the tuning dial, and trimmers on PCB-1 for gradation, RGB phase (TC701) and PLL (TC801).
- The system voltage inspection gives go/no-go figures. With 5.0 V and 34.0 V fed to K401, TP401 should read 4.5 V ± 0.2 V and TP404 32.0 V ± 1.0 V.
- The troubleshooting chart starts from a 9.0 V supply at the Game Gear's power jack and checks for about 0.65 V peak-to-peak video at TP207 on PCB-2. Its power supply check names L401, C410, R405, Z401 and C409 when the 32 V at TP404 is missing.
- The disassembly needs a special screwdriver for two of the screws (502), which Sega describes as "for LH2".
What this manual does not contain
[edit | edit source]- NTSC tuner models.
- The Game Gear itself; see Sega Game Gear Maintenance Manual (1992) and Sega Game Gear VA1 Service Manual.
Related documents
[edit | edit source]- Sega Game Gear Maintenance Manual (1992): its accessories list names the three TV Tuner models.
- Sega Game Gear VA1 Service Manual