Brand: YAMAHA
Category: Audio/Video
Document Type: Manual
Language: EN
Manual for CR-840
Uploaded: Nov. 21, 2025, 8:17 p.m.
Manual Publish Date: 1979-02-01
Front Panel Controls:
- Power Switch (1)
- FM/AM Tuning Scale (4)
- Volume Control (9)
- Input Selector (8)
- Bass and Treble Controls (22)
- Mode Switch (24)
- Tuner FM/AM Switch (27)
- Tuning Knob (28)
- FM Antenna Terminals (75Ω and 300Ω) (1, 2)
- AM Antenna Terminals (3, 4)
- Speaker Terminals (5)
- AC Outlets (6)
- Phono Input Jacks (8)
- Aux Input Jacks (9)
- Tape PB/REC Jacks (10, 11)
- Adapter From/To Jacks (12)
Troubleshooting and error codes
| Title | Operation | Component | Trouble shooting |
|---|---|---|---|
| Tuner Section Adjustment | Tuning knob, align pointer with the starting point of the dial scale. | Tuning knob | Turn the tuning knob and align the pointer with the starting point of the dial scale. |
| FM Tuner Adjustment | Set switches to FM, Local, Muting/OTS Off. Adjust T102 so tuning meter is centered at a detuning point. | T102 | Adjust T102 so that the tuning meter is centered at a detuning point. |
| AM Tuner Adjustment | Align pointer with 600kHz using tuning knob, rotate coil core and adjust for maximum signal quality meter deflection. | Tuning knob, coil core | Align pointer with 600kHz, rotate coil core for maximum signal quality meter deflection. |
| Audio Section Adjustment | Adjust VR701 (Lch) and VR702 (Rch) for a stable 0±5mV output. | VR701 (Lch), VR702 (Rch) | Measure and adjust output voltage to 0±5mV. |