Sony MZ-R91 MiniDisc Recorder

Sony MZ-R91 MiniDisc player/recorder (blue). Quantity 1. Used.
* No other items or accessories are included in the sale *
** This sale does not include any way of powering the device. Unless otherwise stated, this device requires a special kind of rechargeable 'gumstick' battery that is inserted into the device. Please either ensure you are familiar with this requirement in advance, or reach out to us if you are unsure. **

Summary:
Sold for Parts Only / Not Working.
This is a DAMAGED device and may lose some or all of the functionality it had at the time of testing.
Face buttons somewhat unresponsive and erratic. Playback sometimes pauses when device is placed face-up on a flat surface.
Almost perfect cosmetic condition.

Product Condition (Appearance):
Display Panel : No noticeable scratches.
Front Face : No callouts.
Sides : No callouts.
Rear Face : No callouts.
Internal Battery Compartment : No callouts.
No noticeable dents or signs of crushing.
All external facing screws present and tightened.

Product Condition (Functionality):
Face buttons somewhat unresponsive and erratic. Playback somtimes pauses when device is placed face-up on a flat surface.
See test results and photographs for detail.

Player / Recorder Unit:
Sony MZ-R91

Power Via Rechargeable Gumstick Battery : OK *** Rechargeable gumstick battery is not included in the sale ***
Power Via External AA Battery Case : OK *** External AA battery case is not included in the sale ***
Power Via AC Adapter (3V, 500mA) : OK *** AC adapter is not included in the sale ***
Rechargeable Gumstick Battery Charging Via AC Adapter (3V, 500mA) : OK *** Neither rechargeable gumstick battery, nor AC adapter are included in the sale ***

Audio Playback : Playback somtimes pauses when device is placed face-up on a flat surface.
Audio Output : OK

Recording Via External Microphone (Analogue) : OK
Recording Via LINE IN (Analogue) : OK
Recording Via Optical Cable (Digital) : OK

Stop / Charge : Somewhat unreponsive and erratic
Play : Somewhat unreponsive and erratic
Pause : Somewhat unreponsive and erratic
Record : OK
Previous Track : Somewhat unreponsive and erratic
Next Track : Somewhat unreponsive and erratic
End Search : Somewhat unreponsive and erratic
Volume Down : Somewhat unreponsive and erratic
Volume Up : Somewhat unreponsive and erratic
Menu / Enter (Jog Dial) : OK
Hold : OK
Synchro Rec : OK
Track Mark : OK

Disk Insert : OK
Disk Eject : OK

Device Setting Details:
AVLS set to OFF
MEGA BASS set to 0
AUDIO OUT set to Headphone

Product Information:
The Sony MZ-R91 was released in October 1999, just eleven days after the MZ-R90. It has both playback and recording functionality. 
It has an aluminium body (the MZ-R90 has a magnesium body).
At the time of release it was claimed to deliver the world's longest continuous playback / recording performance for a portable MD device. When used with both a gumstick battery and AA/LR6 dry cell battery, it was said to be capable of approximately 29 hours of continuous playback or 14.5 hours of continuous recording.
It does not have MDLP functionality. 
It weighs 110 grams without a battery or disc installed. 
It has a 3.5 mm headphone jack for audio output.

Hopefully this information is clear and covers everything you need, but don't hesitate to reach out if you have any questions.